Hach Sigma 950, 3314 Instrument Manual

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Catalog Number 3314

Sigma 950 Flow Meter

INSTRUMENT MANUAL

sp/dk 11/08 5ed

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Section 1 Safety Precautions........................................................................................................... 5

1.1 Use of Hazard Information ........................................................................................................... 5

1.1.1 Precautionary Labels .......................................................................................................... 5

1.2 Hazardous Locations ................................................................................................................... 6

1.3 Confined Space Entry .................................................................................................................. 6

1.4 FCC Requirements ...................................................................................................................... 7

1.5 Service Requirements.................................................................................................................. 8

Section 2 Specifications.................................................................................................................... 9

2.1 Factory Installed Options .......................................................................................................... 9

Section 3 Introduction ..................................................................................................................... 15

3.1 Measurement Capabilities ......................................................................................................... 15

3.2 Front Panel Features and Controls............................................................................................15

3.2.1 Power Indicator Light ........................................................................................................ 17

Section 4 Controller Installation.................................................................................................... 19

4.1 Unpacking the Instrument .......................................................................................................... 20

4.2 Choosing the Proper Site........................................................................................................... 20

4.3 Mounting Options....................................................................................................................... 20

4.3.1 Wall Mounting (Optional) .................................................................................................. 20

4.3.2 Suspension Harness Installation (Optional) ...................................................................... 21

4.3.3 Manhole Rung Hanger (Optional) ..................................................................................... 21

4.4 Installing the Power Supply........................................................................................................ 22

4.5 Interface Connector Descriptions............................................................................................... 23

4.6 12 V dc Connections.................................................................................................................. 23

4.7 Sampler...................................................................................................................................... 24

4.7.1 Sampler Connections........................................................................................................24

4.7.2 Sampler Programming ...................................................................................................... 24

Section 5 Basic Programming Setup ........................................................................................... 25

5.1 Initial Power-Up of Meter ........................................................................................................... 25

5.2 Basic Programming.................................................................................................................... 25

Section 6 Sensor Installation ......................................................................................................... 33

6.1 Downlooking Ultrasonic Depth Sensor ...................................................................................... 33

6.1.1 Downlooking Ultrasonic Depth Sensor Connection .......................................................... 33

6.1.2 Downlooking Ultrasonic Depth Sensor Programming....................................................... 33

6.1.3 Downlooking Ultrasonic Depth Sensor Calibration ........................................................... 34

6.1.3.1 Liquid Depth .............................................................................................................34

6.1.3.2 Sensor Height .......................................................................................................... 35

6.1.3.3 Setting the Invisible Range ...................................................................................... 35

6.2 In-Pipe Zero Deadband Ultrasonic Depth Sensor...................................................................... 36

6.2.2 Programming the In-Pipe Zero Deadband Ultrasonic Depth Sensor ................................ 36

6.2.3 Beam Angle ...................................................................................................................... 36

6.2.4 Calibrating the In-Pipe Zero Deadband Ultrasonic Depth Sensor .................................... 36

6.3 Submerged Area/Velocity Sensor.............................................................................................. 38

6.3.1 Bare Lead Sensor Cables................................................................................................. 38

6.3.2 Junction Box Connection Procedure................................................................................. 38

6.3.3 Submerged Area/Velocity Sensor Programming .............................................................. 40

6.3.4 Submerged Area/Velocity Sensor Calibration................................................................... 40

6.4 Low Profile Velocity-Only Sensor............................................................................................... 40

6.4.1 Low Profile Velocity-Only (Wafer) Sensor Connection ..................................................... 41

6.4.2 Low Profile Velocity-Only Sensor Programming ............................................................... 41

6.4.3 Low Profile Velocity-Only Sensor Calibration ................................................................... 41

6.5 Submerged Depth Only Sensor ................................................................................................. 41

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6.5.1 Submerged Depth Only Sensor Connection .....................................................................42

6.5.2 Submerged Depth Only Sensor Programming ..................................................................42

6.5.3 Submerged Depth Only Sensor Calibration ......................................................................42

6.6 Bubbler .......................................................................................................................................44

6.6.1 Bubbler Connections .........................................................................................................44

6.6.1.1 Meter-End Cable Terminations.................................................................................45

6.6.1.2 Routing the Bubbler Line ..........................................................................................45

6.6.2 Bubbler Installation............................................................................................................46

6.6.2.1 Installation Guidelines ..............................................................................................46

6.6.3 Depth Only and Bubbler Area/Velocity Calibration............................................................46

Section 7 Optional Device Installation .........................................................................................49

7.1 Rain Gauge ................................................................................................................................49

7.1.1 Rain Gauge Connection ....................................................................................................49

7.1.2 Rain Gauge Programming.................................................................................................49

7.2 pH Probe ....................................................................................................................................50

7.2.1 pH Probe Connection ........................................................................................................50

7.2.2 pH Probe Programming.....................................................................................................50

7.2.3 pH Probe Calibration .........................................................................................................50

7.3 ORP Probe .................................................................................................................................51

7.3.1 ORP Probe Connection.....................................................................................................51

7.3.2 ORP Programming ............................................................................................................51

7.3.3 ORP Preamplifier/Junction Box Calibration.......................................................................52

7.4 Dissolved Oxygen Probe............................................................................................................52

7.4.1 Dissolved Oxygen Probe Connection................................................................................52

7.4.2 Dissolved Oxygen Probe Programming ............................................................................52

7.4.3 Dissolved Oxygen Probe Temperature Programming.......................................................53

7.4.4 Dissolved Oxygen Probe Calibration.................................................................................53

7.5 Conductivity Probe .....................................................................................................................54

7.5.1 Conductivity Probe Connection .........................................................................................54

7.5.2 Conductivity Probe Programming......................................................................................54

7.5.3 Conductivity Temperature Programming...........................................................................54

7.5.4 Conductivity Probe Calibration ..........................................................................................55

Section 8 Communications Setup.................................................................................................57

8.1 RS232 Setup ..............................................................................................................................57

8.1.1 RS232 Connections...........................................................................................................57

8.1.2 RS232 Programming .........................................................................................................58

8.2 Modem .......................................................................................................................................59

8.2.1 Modem Connection ...........................................................................................................59

8.2.2 Modem Programming........................................................................................................59

8.2.3 Modem Options .................................................................................................................60

8.2.3.1 Pager Option ............................................................................................................60

8.2.3.2 Reporting Devices ....................................................................................................61

8.2.3.3 Entering the Phone Number of the Remote Computer.............................................63

8.2.3.4 Choosing the Dial Method (Tone or Pulse) ..............................................................64

8.3 Analog Communications ............................................................................................................64

8.3.1 4–20 mA Output ................................................................................................................64

8.3.1.1 4–20 mA Connections ..............................................................................................64

8.3.1.2 Programming the 4–20 mA Output ..........................................................................65

8.3.1.3 Calibrating the 4–20 mA Output ...............................................................................65

8.3.2 Analog Inputs.....................................................................................................................67

8.3.2.1 Analog Voltage Inputs ..............................................................................................67

8.3.2.2 Analog Voltage Inputs Programming........................................................................67

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8.4 Alarm Relays.............................................................................................................................. 68

8.4.1 Alarm Relay Connections ................................................................................................. 68

8.4.2 Alarm Relays Programming .............................................................................................. 69

8.4.2.1 Trouble Alarms......................................................................................................... 69

8.4.2.2 Set Point Alarms ...................................................................................................... 70

Section 9 Maintenance .................................................................................................................... 71

9.1 Routine Maintenance................................................................................................................. 71

9.1.1 Calibration......................................................................................................................... 71

9.1.2 Cleaning the Case ............................................................................................................ 71

9.1.3 Maintaining Desiccant Cartridges and Desiccant ............................................................. 72

9.1.3.1 Replacing the Desiccant .......................................................................................... 72

9.1.3.2 Rejuvenating the Desiccant ..................................................................................... 72

9.1.3.3 Maintaining the Hydrophobic Membrane ................................................................. 72

9.2 Upgrades, Repairs, General Maintenance................................................................................. 72

9.2.1 Internal Maintenance Items............................................................................................... 73

9.2.2 Removing the Front Panel ................................................................................................ 73

9.2.3 Re-Installing the Front Panel ............................................................................................ 74

9.3 Circuit Board Identification......................................................................................................... 75

9.4 Fuse and Connector Locations.................................................................................................. 75

9.4.1 Fuse Removal and Inspection .......................................................................................... 77

9.4.2 Working with Wiring Connectors....................................................................................... 78

9.5 Replacing the Internal Desiccant Module .................................................................................. 78

9.6 Replacing the Internal Case-Humidity Indicator Disc................................................................. 78

9.7 Memory Batteries....................................................................................................................... 79

Appendix A Program Flow Charts ................................................................................................ 81

Appendix B Programming Features............................................................................................. 87

Appendix C Primary Devices & Head Measurement Locations........................................... 101

Appendix D Programming Worksheet ....................................................................................... 105

Appendix E SCADA-Modbus® System Guidelines ................................................................. 109

Appendix F Batteries and Chargers ........................................................................................... 125

Appendix G Troubleshooting ................................................................................................. 129

Appendix H Manning Roughness Coefficients........................................................................ 135

Appendix I Engineering Drawings .............................................................................................. 137

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Section 1 Safety Precautions

Please read this entire manual before unpacking, setting up, or operating this instrument.

Pay particular attention to all danger and caution statements. Failure to do so could result in serious injury to the operator or damage to the equipment.

Do not use or install this equipment in any manner other than that which is specified in this manual.

1.1 Use of Hazard Information

If multiple hazards exist, this manual will use the signal word (Danger, Caution, Note) corresponding to the greatest hazard.

DANGER Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION Indicates a potentially hazardous situation that may result in minor or moderate injury.

NOTE Information that requires special emphasis.

1.1.1 Precautionary Labels

Read all labels and tags attached to the instrument. Personal injury or damage to the instrument could occur if not observed.

This symbol, if noted on the instrument, references the instruction manual for operation and/or safety information.

Electrical equipment marked with this symbol may not be disposed of in European public disposal systems after 12 August of 2005. In conformity with European local and national regulations (EU Directive 2002/96/EC), European electrical equipment users must now return old or end-of life equipment to the Producer for disposal at no charge to the user.

Note: For return for recycling, please contact the equipment producer or supplier for instructions on how to return end-of-life equipment, producer-supplied electrical accessories, and all auxiliary items for proper disposal.

This symbol, when noted on a product enclosure or barrier, indicates that a risk of electrical shock and/or electrocution exists and indicates that only individuals qualified to work with hazardous voltages should open the enclosure or remove the barrier.

This symbol, when noted on the product, identifies the location of a fuse or current limiting device.

This symbol, when noted on the product, indicates that the marked item can be hot and should not be touched without care.

This symbol, when noted on the product, indicates the presence of devices sensitive to Electro-static Discharge and indicates that care must be taken to prevent damage to them.

This symbol, when noted on the product, identifies a risk of chemical harm and indicates that only individuals qualified and trained to work with chemicals should handle chemicals or perform maintenance on chemical delivery systems associated with the equipment.

This symbol, if noted on the product, indicates the need for protective eye wear.

This symbol, when noted on the product, identifies the location of the connection for Protective Earth (ground).

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Safety Precautions

1.2 Hazardous Locations

The Sigma 950 Flow Meter is not approved for use in hazardous locations as defined in the National Electrical Code.

DANGER Although some Hach products are designed and certified for installation in hazardous locations as defined by the National Electrical Code, many Hach products are not suitable for use in hazardous locations. It is the responsibility of the individuals who are installing the products in hazardous locations to determine the acceptability of the product for the environment. Additionally, to ensure safety, the installation of instrumentation in hazardous locations must be per the manufacturer's control drawing specifications. Any modification to the instrumentation or the installation is not recommended and may result in life threatening injury and/or damage to facilities.

DANGER

Bien que certains produits Sigma soient conçus et certifiés pour être installés dans des endroits dangereux tels que définis par le National Electric Code, de nombreux produits Sigma ne conviennent pas pour de tels endroits. Il relève de la responsabilité des personnes qui placent les produits dans des endroits dangereux de déterminer s'ils sont adaptés à cet environnement. En outre, à des fins de sécurité, le placement de machines dans des endroits dangereux doit s'effectuer dans le respect des consignes des schémas de contrôle du fabricant. Toute modification apportée aux machines ou tout déplacement de celles-ci est déconseillé, car susceptible de provoquer des accidents matériels et/ou corporels.

1.3 Confined Space Entry

The following information is provided to guide users of Sigma 950 Flow Meters on the dangers and risks associated with entry into confined spaces.

DANGER Additional training in Pre-Entry Testing, Ventilation, Entry Procedures, Evacuation/Rescue Procedures and Safety Work Practices is necessary to ensure against the loss of life in confined spaces.

DANGER Pour éviter les accidents mortels dans les espaces confinés, il faut organiser des formations supplémentaires dans les matières suivantes: Contrôle avant entrée, Ventilation, Procédures d'entrée, Procédures d'évacuation et de secours et Méthodes de travail sûres.

On April 15, 1993, OSHA's final ruling on CFR 1910.146, Permit Required Confined Spaces, became law. This standard directly affects more than 250,000 industrial sites in the United States and was created to protect the health and safety of workers in confined spaces.

Definition of Confined Space

A Confined Space is any location or enclosure that presents or has the immediate potential to present one or more of the following conditions:

• An atmosphere with less than 19.5% or greater than 23.5% oxygen and/or more than

10 ppm Hydrogen Sulfide (H

S).

• An atmosphere that may be flammable or explosive due to gases, vapors, mists,

dusts, or fibers.

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• Toxic materials which upon contact or inhalation, could result in injury, impairment of

health, or death.

Confined spaces are not designed for human occupancy. They have restricted entry and contain known or potential hazards.

Examples of confined spaces include manholes, stacks, pipes, vats, switch vaults, and other similar locations.

Standard safety procedures must always be followed prior to entry into confined spaces and/or locations where hazardous gases, vapors, mists, dusts, or fibers may be present. Before entering any confined space check with your employer for procedures related to confined space entry.

1.4 FCC Requirements

1. The Federal Communications Commission (FCC) has established Rules which permit

this device to be directly connected to the telephone network. Standardized jacks are used for these connections. This equipment should not be used on party lines or coin lines.

2. If this device is malfunctioning, it may also be causing harm to the telephone network;

this device should be disconnected until the source of the problem can be determined and until repair has been made. If this is not done, the telephone company may temporarily disconnect service.

3. The telephone company may make changes in its technical operations and

procedures; if such changes affect the compatibility or use of this device, the telephone company is required to give adequate notice of the changes.

Safety Precautions

4. If the telephone company requests information on what equipment is connected to

their lines, inform them of:

a. The telephone number that this unit is connected to,

b. The ringer equivalence number [1.4B]

c. The USOC jack required [RJ11C], and

d. The FCC Registration Number.

Items (b) and (d) are indicated on the label. The ringer equivalence number (REN) is used to determine how many devices can be connected to your telephone line. In most areas, the sum of the RENs of all devices on any one line should not exceed five. If too many devices are attached, they may not ring properly.

Equipment Attachment Limitations Notice:

The Canadian Industry Canada label identifies certified equipment. This certification means that the equipment meets certain telecommunications network protective, operational and safety requirements. The Department does not guarantee the equipment will operate to the user's satisfaction.

Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the local telecommunications company. The equipment must also be installed using an acceptable method of connection. In some cases, the company's inside wiring associated with a single line individual service may be extended by means of a certified connector assembly (telephone extension cord). The customer should be aware that compliance with the above conditions may not prevent degradation of service in some situations.

Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment.

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Safety Precautions

Users should ensure for their own protection that the electrical ground connections of the power utility, telephone lines and internal metallic water pipe system, if present, are connected together. This precaution may be particularly important in rural areas.

CAUTION Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection authority, or electrician, as appropriate.

DANGER Les utilisateurs ne doivent pas essayer d'établir eux-mêmes de telles connexions, mais doivent contacter l'électricien ou l'organisme de vérification électrique appropriée, selon le cas.

The Load Number (LN) assigned to each terminal device denotes the percentage of the total load to be connected to a telephone loop which is used by the device, to prevent overloading. The termination on a loop may consist of any combination of devices subject only to the requirement that the total of the Load Numbers of all the devices does not exceed 100.

1.5 Service Requirements

In the event of equipment malfunction, all repairs should be performed by the manufacturer or an authorized agent. It is the responsibility of users requiring service to report the need for service to the manufacturer, or to one of our authorized agents. Service can be facilitated throughout our office:

Hach Company 5600 Lindbergh Drive, P.O. Box 389 Loveland, CO 80539 Telephone: (970) 669-3050

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Section 2 Specifications

QK1H

K2H

Specifications are subject to change without notice.

General

Dimensions 34.3 cm H ´ 25.4 cm W ´ 24.1 cm D (13.5 in. ´ 10.0 in. ´ 9.5 in.)

Weight 5 kg (11 lb) not including power source

Enclosure

Tem per ature Storage: -40 to 80 °C (-40 to 176 °F) Operate: -10 to 65.5 °C (14 to 150 °F)

Power Requirements

Graphics Display

Keypad

Totalizers 8-digit resettable and 8-digit non-resettable software

Time Base Accuracy ± 0.007%

Measurement Modes

NEMA 4X, 6 with front cover open or closed UV resistant, stable from -40 to 80 °C (-40 to 176 °F)

12 V dc supplied from 6 amp-hr. gel or 4 amp-hr. Ni-Cad battery 115 V ac, 230 V ac or 100 V ac power supply/battery charger

Back-lit liquid crystal display (LCD), auto-off when not in use (under battery operation). 8 line ´ 40 character in text mode, 60 ´ 240 pixels in graphics mode.

21-position sealed-membrane switch with blinking green LED to indicate power on. Four “soft keys,” functions defined by display.

Flumes: Parshall, Palmer Bowlus, Leopold-Lagco, H, HL, HS, Trapezoidal Weirs: V-notch, Contracted/Non-Contracted rectangular, Thel-Mar, Cipolletti Manning Equation: Round, U, and Rectangular Channels Flow Nozzle: California Pipe Head vs. Flow: Custom programmable curve of up to 100 points. Level only: Inches, feet, centimeters, meters Area Velocity: Level-area table, Circular pipe, U-shaped channel, Trapezoidal channel,

Rectangular channel

Power Equation:

Memory Mode: Either slate or wrap-around may be selected.

Data Logging

Sampler Output 12 to 17 V dc pulse, 100 mA max at 500 ms duration

Communications RS232 Serial Interface, SCADA-Modbus

Data Points: Approximately 20,000 standard. Expandable up to 116,000 data points. Daily statistics: Available for up to 32 days. Recording Intervals: 1, 2, 3, 5, 6, 10, 12, 15, 20, 30, 60 minutes

ASCII communication protocol

2.1 Factory Installed Options

Integral pH/Temperature/ORP Meter (pH and ORP cannot be simultaneously measured)

Control/Logging

pH/Temperature Sensor

Measurement Range 2 to 12 pH, within specifications, 0–14 plt. maximum range.

Operating Temperature -10 to 80 °C (14 to 176 °F)

Dimensions 19.5 mm D ´ 15.24 cm L (0.75 in. ´ 6 in.) with 19.5 mm (0.75 in.) mpt cable end

Totalizers 6-digit non-resettable mechanical Units: ft³, gal, m³, liter, acre-ft

Field selectable to log pH/temperature/ORP independent of flow or in conjunction with flow; also controls sample collection in response to value of low/high setpoints.

Temperature compensated; impact resistant ABS plastic body; combination electrode with porous Teflon junction.

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Specifications

Integral Dissolved Oxygen Meter

Control/Logging

Measurement Method Polargraphic

Sensor Temperature compensated; impact resistant polypropylene body

Measurement Range 0 to 20 mg/L

Resolution 0.01 mg/L

Accuracy ±0.02 mg/L

Operating Temperature 0 to 50 °C (32 to 122 °F)

Dimensions 16.5 mm ´ 12.7 cm (0.65 in. ´ 5 in.) with 19.5 mm (0.75 in.) mpt cable end

Integral Conductivity Meter

Control/Logging

Sensor Temperature compensated; impact resistant polypropylene body

Measurement Range 10 to 100 mS/cm

Field selectable to log dissolved oxygen independent of flow or in conjunction with flow. Also controls sample collection in response to value of low/high set points.

Field selectable to log conductivity independent of flow or in conjunction with flow. It also controls sample collection in response to value of low/high set points.

Resolution 0.01 mS/cm or 1 mS/cm

Accuracy ±1% of reading + 0.05 mS/cm

Operating Temperature 0 to 50 °C (32 to 122 °F)

Dimensions 17 mm ´ 12.7 cm (0.67 in. ´ 5 in.) with 19.5 mm (0.75 in.) mpt cable end

Rain Gauge Input

General Information

Analog Input Channels

General Information

Alarm Relays

General Information

4–20 mA Output

General Information

Maximum Resistive Load

For use with Hach Tipping Bucket Rain Gauge. Flow meter records rainfall data in 0.01 in. increments.

Up to 7 additional data logging channels record data from external source(s) Field assignable units

-4.5 to +4.5 V dc and 0 to 20 mA

(4) 10 amp/120 V ac or 5 amp/250 V ac form C relays ±0.1% FS Error User assignable for any internal or external data channel or event.

2 output signals available User assignable

600 ohms

Output Voltage 24 V dc–no load

Insulation Voltage

Between flow meter and 4–20 mA output - 2500 V ac Between the two 4–20 mA outputs - 1500 V ac

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Communications

RS232 - up to 19,200 baud

General Information

Modem - 14400 bps., V.32 bis, V.42, MNP2-4 error correction. V.42 bis MNP5 data compression. MNP 10-EC Cellular Protocol

Sensor Specifications

Pager SCADA-Modbus

communication protocol (standard) via RS232 or optional modem

Bubbler Sensor

Accuracy ±0.003 m (0.011 ft) linearity and hysteresis at 22 °C (72 °F), from 0.01 to 11.75 ft

Range 0.003 to 3.6 m (0.01 to 11.75 ft)

Specifications

Ambient Operating Tem per ature

–18 to 63 °C (0 to 145 °F)

Temperature Error +/-0.000. ft./°F (maximum error within compensated temperature range per degree of change)

Air Intakes Bubble source and reference port—desiccant protected. Fittings provided for remote intakes.

Filter 10 micron on bubble source intake

Line Purge Bubble line is high pressure purged at programmed intervals or in manual mode on demand.

Line Size 0.32 cm (

/8 in.) ID standard

Line Lengths 160 m (500 ft) maximum

Submerged Depth Only Sensor

Accuracy +0.1% full scale (Non-linearity and dysteresis)

Range P/N 2963, 0 to 1.75 m (2.5 psi, 0 to 5.75 ft)

Ambient Operating Tem per ature

Temperature Error

0 to 71 °C (32 to 160 °F)

2.5 psi: 0 to 5.75 ft. +/-0.006 ft./ °F

5.0 psi: 0 to 11.75 ft. +/-0.0012 ft./ °F

Air Intake Atmospheric pressure reference is desiccant protected

Material 316 stainless steel body with titanium diaphragm

Cable 4-conductor poly-urethane sensor cable with air vent

Cable Length 7.6 m (25 ft) standard; 76 m (250 ft) maximum

Dimensions (transducer only)

2.54 x 17.2 cm (1 x 6.75 in.)

Weight 0.7 kg (1.5 lbs)

Downlooking Ultrasonic Depth Sensor–50 kHz

Accuracy 1 to 10 ft. +/- 0.01 ft. (+/-0.003 m) (at 22 °C (72 °F), still air, 40 to 70% relative humidity)

Maximum distance from sensor to liquid 9.1 m (30 ft)

Range

Minimum distance from sensor to liquid 38.1 cm (15 in.)

Span 0 to 8.84 m (0 to 29 ft.)

Sensor Certification

USA: Class I, Zone I, Groups A, B, C, D Canada: Class I, Division I, Groups A, B, C, D, Class II, Division I, Groups E, F, G

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Specifications

Ambient Operating Temperatu re

Material PVC housing with Buna-N acoustic window

Cable 4-conductor with integral stainless steel support cable

Cable Length 7.6 m (25 ft.) standard (custom lengths are available)

Crystal Specification 50 kHz, 11.5° included beam angle

Dimensions (transducer only)

Weight 0.7 kg (1.5 lbs)

Downlooking Ultrasonic Depth Sensor–75 kHz

Accuracy 1 to 10 ft ±0.01 ft (±0.003 m) at 22 °C (72 °F), still air, 40–70% relative humidity.

Range

Span 0 to 4.57 m (0 to 15 ft)

Sensor Certification

Ambient Operating Temperatu re

Temperature Error

-18 to 60 °C (0 to 140 °F)

9.5 cm H x 7 cm D (3.75 in. H x 2.75 in. D)

Maximum distance from sensor to liquid 3.3 m (1 ft)

Minimum distance from sensor to liquid 23 cm (14 in.)

USA: Class I, Zone I, Groups A, B, C, D Canada: Class I, Division I, Groups A, B, C, D, Class II, Division I, Groups E, F, G

–18 to 60 °C (0 to 140 °F)

±0.000047 ft/°F (maximum error within compensated temperature range—per degree of change.)

Resolution 0.0011 ft

Material PVC housing with Buna-N acoustical window

Cable 4-conductor with integral stainless steel support cable

Cable Length 7.6 m (25 ft) standard (custom lenghts are available)

Crystal Specification 5° beam angle with horn

Dimensions 75 kHz, 12.7 cm (H) x 5.7 cm (D) (5.0 in. x 2.25 in.)

Weight 1.5 lb

In-Pipe Ultrasonic Depth Sensor –75 kHz

Accuracy

Range

Span 0.0.8 to 4.57 m (0.125 to 15 ft)

Sensor Certification

Resolution 0.0075 inches

Ambient Operating Temperatu re

0.038 to 4.57 m +/-0.003 m (0.125 to 15 ft. +/- 0.01 ft.) (at 22 °C (72 °F), still air, 40 to 70 % relative humidity)

Distance from sensor to liquid: 0 inches (minimum) to 13.4 feet (maximum), @ 20 °C still air, ideal target, 25 ft cable.

USA: Class I, Zone I, Groups A, B, C, D Canada: Class I, Division I, Groups A, B, C, D, Class II, Division I, Groups E, F, G

18 to 60 °C (0 to 140 °F)

Temperature Error 0.00005 meter/°C (+/-0.0001 ft./ °F)

Material Stat-Kon A-E ABS Plastic

Cable 4-conductor

typical

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Cable Length 7.6 m (25 ft) standard, custom lengths up to 30 m (100 feet)

Crystal Specification 75 kHz, 7° included beam angle

Specifications

Dimensions (transducer only)

Mounting

Connection Bare lead connection via 3658 junction box or quick connect.

Low-Profile Velocity-Only Sensor

Accuracy ±2% of reading; Zero Stability: <0.015 ms (± 0.05 fps)

Range -1.52 to 6.1 ms (-5 to +20 fps)

Span

Sensor Certification

Resolution 0.3 cms (0.01 fps)

Response Time 4.8 seconds

Profile Time 4.8 seconds

Probe Dimensions

Cable Urethane Jacket, (2x) RG174U Coax Cables, (4x) #22 AWG Copper Stranded

4.44 cm (1.75 in.) maximum diameter, 31.435 cm (12.375 in.) long

Dedicated Mounting Rings, Permanent Mounting Bracket (installs directly to pipe wall), Adjustable Mounting Band Kit.

USA: Class I, Zone I, Groups A, B, C, D Canada: Class I, Division I, Groups A, B, C, D, Class II, Division I, Groups E, F, G

Length: 6.86 cm (2.7 in.) Width: 3.81 cm (1.5 in.) Height: 1.12 cm (0.44 in.)

Cable Length 7.6 m (25 ft) standard (custom cable lengths to 76 m (250 ft) are available)

Submerged Area/Velocity Sensor

Level Measurement

Method Doppler Ultrasonic/Pressure Transducer

Material Polyurethane body, 316 series stainless steel diaphragm

Cable 8-conductor urethane sensor cable with air vent

Cable Length 25 ft (7.6 m) standard, 76.2 m (250 ft) max.

Length: 12.7 cm (5 in.)

Probe Dimension

Width: 3.81 cm (1.5 in.) Height: 2.03 cm (0.8 in.)

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Specifications

Depth Accuracy: ±2% of reading Standard Sensor Range: 0.005 m–3.5 m ±0.007 m (0.018–11.5 ft ±0.023 ft) Extended Range: 0.005 m–10.5 m ±0.021 m (0.018–34.6 ft ±0.07 ft)

Maximum Allowable Depth: 3x over pressure

Operating Temperature Range: 32 to 160 °F (0 to 71 °C)

Compensated Temperature Range: 32 to 86 °F (0 to 30 °C)

Depth

Velocity Measurement

Method Doppler Ultrasonic

Material Polymere body, with stainless steel diaphragm

Cable 8-conductor urethane sensor cable with air vent

Cable Length 25 ft (7.6 m) standard, 76.2 m (250 ft) max.

Temperature Error:

0.005 to 3.5 m ±0.0022 m/°C (0.018 to 11.5 ft ±0.004 ft/°F)

0.005 to 10.5 m ±0.006 m/°C (0.018 to 34.6 ft ±0.012 ft/°F) (maximum error w/in compensated temperature range - per degree of change)

Velocity Induced Error on Depth (patent pending): 0 to 3.05 m/sec (0 to 10 ft/sec) = 0.085% of reading

Air Intake: Atmospheric pressure reference is desiccant protected

Length: 12.7 cm (5 in.)

Probe Dimension

Accuracy ±2% of reading

Range –1.52 to 6.1 ms (-5 to +20 fps)

Resolution 0.0028 ms (0.01 fps)

Response Time 4.8 sec.

Profile Time 4.8 sec.

Zero Stability <0.05 fps (<0.015 ms)

Depth 2 cm (0.8 in.) minimum, typical

Operating Temperature Range

Width: 3.81 cm (1.5 in.) Height: 2.03 cm (0.8 in.)

–18 to 60 °C (0 to 140 °F)

Page 17

Section 3 Introduction

3.1 Measurement Capabilities

The 950 Flow Meter is a portable flow meter that is completely self-contained. With its rugged construction, the meter is completely sealed—even with the door open. Conforming to NEMA 4X, 6 standards, the meter also withstands submersion and corrosive gases—again, with its door open. As a result, access to the meter’s keypad is no problem in manholes, rain, and other harsh weather conditions.

The 950 Flow Meter is suitable for measuring and recording flow in open channels, full pipes, and surcharged lines. The 950 Flow Meter is most often used to measure flow in conjunction with a primary measuring device (flume, weir, pipe, etc.) that has a known level-to-flow relationship. The 950 Flow Meter directly measures the level of liquid in a channel that is contributing to flow (referred to as “head”) and calculates the flow rate based on the head-to-flow relationship of the primary device.

The flow meter can also measure the average velocity of the flow stream using a submerged Doppler sensor and calculate flow based on the current level and the Continuity Equation: Wetted Area × Velocity = Flow.

In addition to its extensive data logging capabilities, the 950 Flow Meter is capable of enabling a sampler, pacing a sampler, controlling external devices with four Normally Open/Normally Closed relays, and controlling external devices with two 4–20 mA current outputs.

Communication capabilities include a standard RS232 port and an optional on-board modem used for remote data transfer, remote programming, and updating internal embedded programs using Flash Memory technology (RS232 only). The 950 Flow Meter also provides SCADA Communication Interface functionality using the Modbus protocol. This software protocol communicates with the instrument via an RS232 connection.

Using Hach’s integrated sewer system management software, users can download, remotely program, and conduct other data manipulation via RS232 connection or the optional modem.

3.2 Front Panel Features and Controls

The 950 Flow Meter case has several unique features, all designed to simplify installation, operation, and maintenance.

The instrument front cover protects the panel controls and display window while providing a clear view of the flow meter status on the display. The cover also contains two lockable latches which can be secured with a padlock(s) for security. While a software lock can be programmed to keep unauthorized personnel from operating the keypad, the front cover locking ability provides added security against tampering.

The cover perimeter contains a gasket seal to keep moisture and dirt from entering the front panel area. This seal is not required to maintain the NEMA 4X,6 rating of the case.

ASCII

Page 18

Introduction

Figure 1 950 Flow Meter Front Panel

Item # Description Function

1 Menu bar

2 Display

3Soft keys

4 Status bar

Humidity Indicator

The menu bar appears in a black band on the top edge of the display. The upper left corner of the menu bar shows the time and date. The upper right corner shows the name of the current menu.

The 950 Flow Meter liquid crystal display (LCD) works in conjunction with the four soft keys as a guide through all programming steps. The display also provides other useful information as described below.

The soft keys are the blank, white keys located to the left and right of the display. The function of each key is according to the appearance of the display. If no function is shown for a specific key, that key is not currently needed. The soft key labels appear on the display and point (with a straight line) to the proper soft key to push for that action.

In some cases during a programming step you will be asked to pick an item from a list. The soft keys on the right side of the display will change to display “up” and “down” arrows. This allows you to scroll up and down the list of choices. When the desired choice is highlighted, press the SELECT soft key to choose that item.

The appearance of the status bar changes depending upon the function being performed. The lower left corner of the status bar indicates whether a program is Complete, Running, Halted, or Ready To Start. It will disappear if it is not needed during a programming step. The lower right corner displays system alarm conditions, such as low memory battery, clogged bubbler line, etc. For a list of possible alarms see Alarm Relays on page 68.

The status bar also lists valid choices when entering certain programming information. For example, when selecting level measurement units in the Level Units menu, the status bar indicates the valid choices: cm, ft, in., or m.

The Internal Humidity Indicator changes from blue to pink when the humidity inside the case exceeds 60 percent. An internal desiccant module absorbs any humidity that may have been trapped in the case during final assembly. Under normal operating conditions, this desiccant provides long-term protection against condensed moisture inside the case.

Replace the internal desiccant module only if the indicator turns pink. (See Replacing the Internal

Desiccant Module on page 78).

Page 19

An optional six-digit non-resettable mechanical totalizer is available for the flow meter. Located below the Humidity Indicator, the totalizer indicates total flow and supplements the internal software totalizers (one resettable and one non-resettable) that are configured during programming.

Mechanical

8Soft Keys—

To ta lizer

Option

Display

Button

Function

Keys

Numeric

Keypad

Power On/Off

The totalizer can be configured for all conditions and installations because flow units and scaling are selectable. To select flow and scaling factors for the mechanical and internal software totalizers see

Flow Totalizer on page 95.

To obtain the total flow for any period of time, record the number at the start of the time period, subtract it from the number at the end of the period, and then multiply the difference by the scaling factor.

The Display push-button is located on the upper right side of the case. It allows you to read the display without opening the cover.

The 950 Flow Meter is optimized for portable (battery-powered) use. Its unique power saving modes conserve battery resources by putting the meter to “sleep” during any period of inactivity.

During battery operation or ac power with the screen saver enabled, pressing the Display push-button will “wake up” the flow meter and cause it to turn on the display. The Status Screen is the first screen displayed. Another press of the button causes the display to show additional status information, if necessary. Continuing to press the Display push-button will return you to the initial Status Screen after all information has been shown.

After three minutes of inactivity, the display goes blank to conserve battery power.

The white keys located just above the numeric keys are function keys that are used often while operating the flow meter. These functions are dedicated keys to allow quick access.

Main Menu: This is the program starting point. Press the Main Menu key at any time during programming to return to the Main Menu Screen. The current action is cancelled if changes are not yet accepted.

Level Adjust: Adjust the flow meter to match the current head (or level contributing flow) in the channel.

Run/Stop: Run (or resume) a program. Stops a currently running program.

The numeric keypad is located below the function keys. It consists of the digits 0 through 9, a +/- key, and a decimal key.

To turn the flow meter power on/off use the

Introduction

ON and OFF keys.

3.2.1 Power Indicator Light

When the unit is turned on, a green light located next to the ON key flashes. This does not indicate that a program is running but indicates that the unit has power because under some conditions (battery operation or Screen Saver mode), the display may automatically turn off to conserve battery power.

See Screen Saver Mode on page 97 for details on battery operation and the Screen Saver feature.

Page 20

Introduction

Page 21

Section 4 Controller Installation

DANGER Some of the following manual sections contain information in the form of warnings, cautions and notes that require special attention. Read and follow these instructions carefully to avoid personal injury and damage to the instrument. Only personnel qualified to do so, should conduct the installation/maintenance tasks described in this portion of the manual.

DANGER Certains des chapitres suivants de ce mode d’emploi contiennent des informations sous la forme d’avertissements, messages de prudence et notes qui demandent une attention particulière. Lire et suivre ces instructions attentivement pour éviter les risques de blessures des personnes et de détérioration de l’appareil. Les tâches d’installation et d’entretien décrites dans cette partie du mode d’emploi doivent être seulement effectuées par le personnel qualifié pour le faire.

PELIGRO Algunos de los capítulos del manual que presentamos contienen información muy importante en forma de alertas, notas y precauciones a tomar. Lea y siga cuidadosamente estas instrucciones a fin de evitar accidentes personales y daños al instrumento. Las tareas de instalación y mantenimiento descritas en la presente sección deberán ser efectuadas únicamente por personas debidamente cualificadas.

GEFAHR Einige der folgenden Abschnitte dieses Handbuchs enthalten Informationen in Form von Warnungen, Vorsichtsmaßnahmen oder Anmerkungen, die besonders beachtet werden müssen. Lesen und befolgen Sie diese Instruktionen aufmerksam, um Verletzungen von Personen oder Schäden am Gerät zu vermeiden. In diesem Abschnitt beschriebene Installations- und Wartungsaufgaben dürfen nur von qualifiziertem Personal durchgeführt werden.

PERICOLO Alcune parti di questo manuale contengono informazioni sotto forma d’avvertimenti, di precauzioni e di osservazioni le quali richiedono una particolare attenzione. La preghiamo di leggere attentivamente e di rispettare quelle istruzioni per evitare ogni ferita corporale e danneggiamento della macchina. Solo gli operatori qualificati per l’uso di questa macchina sono autorizzati ad effettuare le operazioni di manutenzione descritte in questa parte del manuale.

DANGER This instrument should be installed by qualified technical personnel to ensure adherence to all applicable electrical codes.

DANGER Cet appareil doit être installé par du personnel technique qualifié, afin d'assurer le respect de toutes les normes applicables d'électricité.

Capped, watertight connectors for external devices are located along the left side of the case. Level sensor inputs and accessories are located along the right side of the case.

A recessed pocket for installing the flow meter power supply is located at the top rear of the case.

Page 22

Controller Installation

4.1 Unpacking the Instrument

Remove the 950 Flow Meter from its shipping carton and inspect it for any visible damage. Contact Hach Customer Service at 1-800-227-4224 if any items are missing or damaged.

4.2 Choosing the Proper Site

The accuracy of your flow measurements greatly depends on the suitability of your monitoring site. Select sites that have normalized flow and minimal turbulence. Turbulence can make it difficult to detect an average velocity in the flow stream. Obstructions, vertical drops, pipe bends, and elbows can create turbulence and affect the accuracy of your measurements. Table 1 contains suggestions for preventing turbulence.

Table 1 Suggestions for Preventing Turbulence

Site Condition Suggested Remedy

Outfalls Place the sensor in at least ten times the maximum expected level upstream of the outfall.

Vertical drops in the channel floor

Elbows, sharp turns, and “Y” connections

Place the sensor in at least ten times the maximum expected level upstream of the vertical drop.

Place the sensor in at least ten times the maximum expected level downstream of the vertical drop.

Place the sensor in at least ten times the maximum expected level upstream of the impediment.

Place the sensor in at least ten times the maximum expected level downstream of the impediment.

4.3 Mounting Options

4.3.1 Wall Mounting (Optional)

Wall mounting the 950 Flow Meter requires the optional Wall Mounting Bracket (P/N.

2743). This bracket provides stable, secure mounting for the flow meter and provides clearance for removing the power supply while the unit is installed. Connect the flow meter with four ¼-20 screws (provided) using the four threaded inserts on the back of the case. (See Figure 2).

Page 23

Figure 2 Wall Mounting Bracket

Controller Installation

4.3.2 Suspension Harness Installation (Optional)

Use the optional Suspension Harness (P/N 2889) to suspend the flow meter in a manhole or similar site. The suspension harness has two captive ¼-20 S.S. mounting screws attached to the top of two threaded inserts on the back of the flow meter.

A stainless steel clip is also provided on top of the harness for mounting to an Instrument Support Bracket (P/N 5713000) or similar support.

When suspending the flow meter, the Suspension Harness utilizes only the top two threaded mounting inserts, leaving the bottom two free. Do not use the bottom inserts for suspending any additional equipment. The inserts are designed to support only the weight of a 950 Flow Meter and will not adequately support additional weight.

4.3.3 Manhole Rung Hanger (Optional)

The Manhole Rung Hanger (P/N 3533) is a convenient way to hang the 950 Flow Meter from a manhole ladder rung. Constructed of 304 Stainless Steel, it makes a temporary mounting as secure as a permanent one.

The Manhole Rung Hanger has two captive thumb screws for securing the bracket to the top two threaded inserts on the 950 Flow Meter. The Manhole Rung Hanger also has a spring loaded handle that secures the Hanger over a rung of up to 1¾ in. (4.4 cm) in diameter.

When suspending the flow meter, the Manhole Rung Hanger utilizes only the top two threaded mounting inserts, leaving the bottom two inserts free. Do not use the bottom inserts for suspending any additional equipment. The inserts are designed to support only the weight of a 950 Flow Meter and will not adequately support additional weight. (See Figure 3 on page 22).

Page 24

Controller Installation

12VDC

RS232

Sampler

Figure 3 Manhole Rung Hanger

1 Place over ladder rung. 2 Connect bottom inserts to meter.

4.4 Installing the Power Supply

The 950 Flow Meter is designed to accept either the manufacturer’s 12 V dc battery pack or ac power converter.

1. Place the power supply on the back of the flow meter. (See Figure 4).

2. Pull the two rubber hold-down clamps up and over the clips on each end of the power

supply.

3. Connect the power supply connector to the port labeled 12 V dc on the top left side of

the case.

Figure 4 Power Supply and Interface Connectors

1 Power Supply 3 12 V dc Port 5 Sampler Port

2 Rubber Hold-down Clamp 4 RS232 Port

Page 25

Controller Installation

4.5 Interface Connector Descriptions

Note: All interface receptacles are covered with push-on caps. These caps are designed to protect the connector pins from dirt and moisture and should be attached to any receptacle not in use.

The interface connector ports are located on the left side of the flow meter case. The 950 Flow Meter comes standard with three interface ports.

• 12 V dc (Power Input)

• RS232 (Serial Communications Port)—(See section 8.1 on page 57 for connection

and programming details).

• Sampler (Automatic Liquid Sampler Control)

In addition, the flow meter can be connected to a wide variety of optional peripheral devices:

• Rain Gauge (section 7.1 on page 49) • Modem (section 8.2.1 on page 59)

• pH (section 7.2 on page 50) • Analog Inputs (section 8.3.2 on page 67)

• ORP (section 7.3 on page 51) • Alarm Relays (section 8.4.1 on page 68)

• Dissolved Oxygen (section 7.4 on page 52) • 4–20 mA Current Loop(section 8.3.1 on page 64)

• Conductivity (section 7.5 on page 54)

One or a combination of up to three sensors can be connected to the 950 Flow Meter, depending on the system configuration.

• Downlook Ultrasonic Depth Sensor (section 6.1 on page 33)

• In-Pipe Zero Deadband Ultrasonic Depth Sensor (section 6.2

on page 36)

• Submerged Area/Velocity Sensor (section 6.3 on page 38)

• Low Profile Velocity Only Sensor (section 6.4 on page 40)

• Submerged Depth Only Sensor (section 6.5 on page 41)

• Bubbler Depth or Bubbler Area/Velocity Sensor (section 6.6

on page 44)

4.6 12 V dc Connections

This connection supplies power to the flow meter. Power sources include a battery (Ni-Cad or Lead Acid), an ac power pack, or an external source such as a deep-cycle marine battery or vehicle cigarette lighter connection. Refer to Batteries and Chargers on

page 125 for more information.

Although the 950 Flow Meter will operate on any attached 12 V dc power supply, the instrument will assume it is battery operated if it detects a less than 14.2 V dc input and will assume it is operating on an ac power converter if it detects a greater than 14.2 V dc input

Table 2 12 V dc Connector Pin Assignments

Pin Signal Description

AGround

B 12 to 17 V dc, unregulated

Page 26

Controller Installation

4.7 Sampler

4.7.1 Sampler Connections

The sampler interface receptacle is used to connect a wastewater sampler to the 950 Flow Meter.

Table 3 Sampler Connector Pin Assignments

Pin Signal Description Wire Color Purpose Rating

A 12 V dc (input only) orange Pin A may receive power from an external device, 500 mA

max load.

B ground brown

C flow pulse output yellow

D sampler start black

E event input red

F bottle number input green

Pin B provides the ground line that is used in conjunction with the other signals on the connector.

Used in with Pin B to signal a sampler that a pre-determined amount of flow has accumulated with a 500 ms pulse.

Used to “wake up” a waste water sampler when a set point condition is met so that it can begin its sampling program. Configure the flow meter for this pin in

Set Point Sampling on page 97.

Used in conjunction with Pin B, this line is normally allowed to float and is switched to ground (by transistor) for the entire period that the set point condition exists.

Received from a waste water sampler and indicates that a sample has been collected. “Sample Taken” information will appear in the data printout when downloaded.

Received from a waste water sampler and used in conjunction with the Event Input signal. It tells the flow meter which bottle was used when a sample was taken. “Sample Times and Dates” information will appear in the data printout when downloaded.

Cable Required for Sampler Connections

12 V dc (w/battery)

to 17 V dc pulse

(w/ac power pack)

500 mA max.

12 V dc (w/battery)

to 17 V dc pulse

(w/ac power pack)

24 V cd (max) at

100 mA (max)

N/A

• Multi-Purpose Half Cable Assembly, 10 ft (3.0 m), 6-pin connector on one end, tinned

wire leads on the other end (P/N 941) or

• Multi-Purpose Full Cable Assembly, 10 ft (3.0 m), 6-pin connector on both ends (P/N

940).

• Cables with 25 ft (7.6 m) lengths and custom sizes are also available.

4.7.2 Sampler Programming

1. From the Main Menu, select SETUP>MODIFY SELECTED ITEMS.

2. Scroll down and highlight

Press

SELECT to continue.

3. Enable Sampler pacing using the

continue.

4. Set the Sampler Pacing using the numeric keypad and Change Units using the

CHANGE UNITS soft key. The 950 Flow Meter will output one

12 V dc pulse each time the specified amount of flow has occurred.

5. Press

ACCEPT.

SAMPLER PACING using the up and down arrow soft keys.

CHANGE CHOICE soft key. Press ACCEPT to

Page 27

Section 5 Basic Programming Setup

5.1 Initial Power-Up of Meter

After power is applied, the flow meter performs a complete diagnostic self-test and displays the menu shown when the unit was last turned off. The Main Menu is the starting point for all programming operations. The Main Menu offers four choices:

• Setup—Basic programming

• Status—Lists all currently measured readings

• Display Data—Shows graphs and tables of logged data

(See Displaying Data on page 87)

• Options—Advanced programming

Regardless of the current menu displayed, pressing the Main Menu function key will bring up the Main Menu screen.

Setup and Option functions lead to sub-menus which configure the basic and advanced features of the flow meter. Refer to the 950 Flow Meter Basic Programming Setup on

page 87. The Display Data and Status lead to sub-menus which provide information only.

Press the pH, temp., etc.).

STATUS soft key to display any data channels that have enabled logging (flow,

11:00 AM 21 - APR - 01 * Main Menu*

5.2 Basic Programming

Note: To make changes to the program entries after the basic programming setup, press the MAIN MENU key and select SETUP>MODIFY SELECTED ITEMS. Highlight the program

entry using the up and down arrow soft keys.

Basic programming setup must be performed, in its entirety, after the instrument is installed. Refer to the 950 Flow Meter Basic Programming Setup on page 87 for more information.

The basic program setup will modify all items: flow units, primary devices, program lock, sampler pacing, site ID, velocity direction, velocity units, velocity cutoff/velocity default.

Note: Velocity features will only display when using a 950 area/velocity flow meter.

Step 1 - Setup

1-A. Press SETUP from the Main Menu to prepare the 950 Flow Meter

for use.

DISPLAY DATA SETUP

OPTIONS STATUS

READY TO START

1-B. Press

Step 2 - Flow Units

Note: Different flow units can be selected in the Sampler Pacing programming section (see Sampler

Pacing on page 28).

2-A. From the Modify All Items screen, highlight Flow Units using the UP and DOWN

MODIFY ALL ITEMS and press ACCEPT to begin setting up the flow units.

keys. Press the

SELECT soft key to continue.

Page 28

Basic Programming Setup

11:00 AM 21 - APR - 01 * Main Menu*

REVIEW ALL ITEMS

READY TO START

MODIFY

ALL ITEMS

MODIFY

SELECTED

ITEMS

2-B. Press CHANGE CHOICE to cycle through the flow unit choices. Refer to Table 4 for

flow unit choices. The flow unit will be used whenever a flow reading is displayed or logged.

2-C. When the desired choice is displayed press

11:00 AM 21 - APR - 01 FLOW UNITS

FLOW UNITS

mdg CANCEL

SELECT APPROPRIATE UNITS

ACCEPT to continue and set level units.

CHANGE

CHOICE

Table 4 Flow Unit Choices

Abbreviation Flow Unit Abbreviation Flow Units

gps Gallons per second cfs Cubic feet per second

gpm Gallons per minute cfm Cubic feet per minute

gph Gallons per hour cfh Cubic feet per hour

lps Liters per second cfd Cubic feet per day

lpm Liters per minute cms Cubic meters per second

lph Liters per hour cmm Cubic meters per minute

mgd Million gallons per day cmh Cubic meters per hour

afd Acre-feet per day cmd Cubic meters per day

Step 3 - Level Units

3-A. Next the flow meter will display the Level Units screen.

3-B. Select the units of measure to use when displaying level readings (Table 5). Level

units of measure are used whenever a level reading is displayed or logged.

Table 5 Level Units Choices

Abbreviation Level Unit

in. inches

ft feet

cm centimeters

Mmeters

Page 29

3-C. Press CHANGE CHOICE to cycle through each of the level unit choices. Press

QK1Hn1K2H

ACCEPT to continue to primary device setup.

Step 4 - Primary Device

Note: Selecting the appropriate primary device is critical for proper flow rate calculations.

4-A. Next, the flow meter will display the Primary Device screen.

4-B. Select the desired primary device, enter the calculation method, shape, and pipe

diameter for that primary device.

Basic Programming Setup

4-C. Press

CHANGE CHOICE to cycle through the primary device choices (see Table 6,

Table 7, Table 8, and Table 9). Show the size and details required for each. Press

ACCEPT to continue to Program Lock.

11:00 AM 21 - APR - 01 PRIMARY DEVICE

CHANGE

PRIMARY DEVICE:

WEIR

SELECT PRIMARY DEVICE

CHOICE

Table 6 Primary Device Choices

Primary Device Description

None—Level Only No primary device installed. Level measurement only.

Weir

Flume Parshall, Trapezoidal, H-type, HL-type, HS-type, Leopold-Lagco, Palmer Bowlus (See Table 8)

Nozzle California pipe

Power Equation

Head vs. Flow

Manning Equation

Area Velocity

Compound, Cipolletti, Contracted rectangular, Non-contracted rectangular, Thel-Mar, V-Notch (22.5-120°), Compound V-Notch (See Table 7)

Enter variables K

, K2, n1 and n2

K1 (0–9999.99), K2 (+/- 0–9999.99), n1 and n2 (1–9.99)

Two independent user–entered look up tables of up to 99 points each Enter up to two tables of up to 100 user-defined head vs. flow points. Head: 0–99.99 in feet or centimeters Flow: 0–99999.99 in any desired units

Rectangular channel, U-shaped channel, or Circular pipe Enter pipe diameter, slope & roughness coefficient. Pipe dia.: 4–240 in. or 101–6096 cm Percent Slope: 0.001–1.00 [1 unit per hundred units = 0.01 slope] Example: 1 m of decline every 100 m =

0.01 slope. Manning Roughness

Circular Pipe: Enter pipe dia., 4–240 in.(10–610 cm) Rectangular Channel: Enter width, 4–999.99 in. (10– 2540 cm) Trapezoidal Channel: Enter width of channel bottom, width of channel top and channel depth, range for

all: 4–999.99 in. (10– 2540 cm) U-Shaped Channel: Enter channel width, 4–999.99 in. (10–2540 cm)

Weir Description

Cipolletti Crest width is in. or cm (1–960 in. or 2.54–2438 cm)

Contracted Rectangular Crest width is in. or cm (1–960 in. or 2.54–2438 cm)

Table 7 Weir Choices

Page 30

Basic Programming Setup

Table 7 Weir Choices (continued)

Weir Description

Non-Contracted Rectangular Crest Width is in. or cm (1–960 in. or 2.54–2438 cm)

Thel-Mar Size in inches. (6, 8, 10, 12 or 15 in.)

V-Notch Angle of notch in degrees (22.5 to 120°)

Compound V-Notch

Flumes Description

Parshall Flume size in inches (1, 2, 3, 6, 9, 12, 18, 24, 30, 36, 48, 60, 72, 84, 96, 108, 120 or 144 in.)

Trapezoidal Flume size (60° S, 60° L, 60° XL, 45° 2", 45° 12")

H - Type Flume size in feet (0.5, 0.75, 1.0, 1.5, 2.0, 2.5, 3.0 or 4.5 ft)

HL - Type Flume size in feet 3.5’, 4.0'

HS -Type Flume size in feet (0.4, 0.6, 0.8 or 1.0 ft)

Leopold-Lagco Flume size in inches (4, 6, 8, 10, 12, 15, 18, 20, 21, 24, 27, 30, 36, 42, 48, 54, 60, 66 or 72 in.)

Palmer-Bowlus Flume size in inches (4, 6, 8, 10, 12, 15, 18, 21, 24, 27, 30, 36, 42, 48, 60 or 72 in.)

Angle of notch in degrees (22.5–120°), notch depth in inches, rectangular width in inches (0–120 in. or 0–304 cm), Contracted or non-contracted.

Table 8 Flume Choices

Device or Equation Description

Level vs. Area Table (two level vs. area

tables are provided)

Nozzle Enter nozzle diameter

Enter up to two tables of up to 99 user-defined level vs. area points; Level: 0–999.9 in ft, in., m or cm Area: 1–99999.99 in ft

Step 5 - Program Lock

Program Lock provides a protective passcode to keep unauthorized personnel from tampering with the keyboard and/or prevent access via RS232 or modem. When enabled, a screen will require a password to be entered. The Program Lock password factory is

set as 9500 and cannot be changed.

5-A. Next, the flow meter will display the Program Lock screen.

5-B. Enable or Disable the program lock using the

ACCEPT to continue to Sampler Pacing.

Step 6 - Sampler Pacing

6-A. Next, the flow meter will display the Sampler Pacing screen.

6-B. Enable Sampler Pacing using the

flow unit choices for sampler pacing.

Table 9 Other Primary Devices

, in.2, m2 or cm

CHANGE CHOICE soft key. Refer to Table 10 for

CHANGE CHOICE soft key. Press

Page 31

Step 7 - Site ID

Basic Programming Setup

6-C. Press ACCEPT to continue with Site ID.

11:00 AM 21 - APR - 01 SAMPLER PACING

CHANGE

SAMPLER PACING

CLEAR ENTRY

(USE NUMERIC KEYPAD)

500 gal

Table 10 Flow Unit Choices

Abbreviation Volume

gal gallons

ltr liters

af acre-feet

cf cubic-feet

Note: A text Site ID may be programmed via Hach's management software and an RS232 connection.

cubic meters

UNITS

CANCEL

Creates an 1–8 digit site identification number. The site ID will appear on all data printouts. This feature is useful when multiple sites are monitored using a single flow meter or if data readings from multiple flow meters are collected.

7-A. Next, the flow meter will display the Site ID screen.

7-B. Enter the site ID using the numeric keypad.

7-C. Press

ACCEPT to continue to total flow units.

Step 8 - Total Flow Units

8-A. Next, the flow meter will display the Total Flow Units screen.

8-B. Set the Total Flow Units (gal, ltr, m

, af, cf) using the CHANGE CHOICE soft key. Total

flow units of measure are used whenever a total flow unit is displayed or logged.

8-C. Press

ACCEPT to continue to velocity direction.

Step 9 - Velocity Direction (only when logging velocity)

9-A. Next, the flow meter will display the Velocity Direction screen.

9-B. Set the Velocity Direction using the

CHANGE CHOICE soft key.

The Velocity Direction feature adapts to a number of difficult sites that would otherwise not be able to measure velocity properly (Upstream, Downstream, and Always Positive). For more information see the Velocity-Only Sensor Instruction Sheet (Cat. No. 88006-89).

9-C. Press

9-D. Set the velocity units (fps, mS) using the

ACCEPT to move to velocity units setup.

CHANGE CHOICE soft key.

Page 32

Basic Programming Setup

9-E. Read the Velocity cutoff warning on the screen. Press any key to continue.

9-F. Enter the Velocity Cutoff, using the numeric keypad. Press

to continue.

9-G. Enter the Velocity Default using the numeric keypad. Press

basic programming setup.

Note: Velocity Cutoffs are used at sites where low velocities and frequent low particulate concentrations occur, if velocity cannot be measured.

Example 1:

Velocity Cutoff = 0.20 fps, Velocity Default = 0 fps

If the velocity falls below 0.20 fps, the meter will store a value of 0 fps until the velocity increases above 0.20 fps.

Example 2:

Velocity Cutoff = 0.20 fps, Velocity Default = 0.20 fps

If the velocity falls below 0.20 fps, the meter will store a value of 0.20 fps until the velocity increases above 0.20 fps.

5.3 Starting and Stopping Programs

Note: When selecting START FROM BEGINNING, all logged data will be cleared from memory. When saving the logged data, make sure the data is downloaded to a DTU or personal computer. If a program is complete, the logger can only be restarted from the beginning (and will clear all logged data).

ACCEPT to end the

When basic programming setup is completed, “run” (or execute) the program selections. Press the

RUN/STOP key to run a program, resume a currently halted program, or stop a

program.

If a program has been halted (and no changes to the program settings were made while it was stopped), press the

RUN key. Select either resume to previously running program

(and retain all logged data) or Start From Beginning (and clear all logged data)

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Status Description

Program is Running

Data Logging, 4-20 mA outputs, sampler control and alarm checking are active.

Program is Halted

Logging stops until the program is restarted. It continues with the last logged value when restarted.

4–20 mA outputs remain unchanged

Sampler control is disabled

Alarm checking is disabled

Program is Complete or Ready to Start

No data logging

4–20 mA outputs stay at last value

No sampler interface

No alarm checking

Program Complete

Basic Programming Setup

A logger is off or lost power for longer than 3 hours or datalogging memory is full (see Data Log on page 91).

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Basic Programming Setup

Page 35

Section 6 Sensor Installation

An individual Sigma 950 flow meter may have one or more of the following sensors:

• Downlook Ultrasonic Sensor • Submerged Pressure Area/Velocity Sensor

• In-Pipe Ultrasonic Sensor • Velocity-Only (Wafer) Sensor • Bubbler

• AV Bubbler

• Submerged Pressure Sensor

6.1 Downlooking Ultrasonic Depth Sensor

6.1.1 Downlooking Ultrasonic Depth Sensor Connection

Note: Use a bare leads sensor and junction box (P/N 3658) for conduit installation.

The Sigma 950 Flow Meter uses a 50 kHz or 75 kHz Downlooking Ultrasonic Depth Sensor. The ultrasonic sensor receptacle is on the left side of the flow meter and labeled Ultrasonic. The connector is keyed and can only be inserted key up.

Table 11 Downlooking Ultrasonic Depth Sensor Connector Pin Assignments

Pin Signal Description Wire Color

A temperature (+) red

B temperature (-) black

C ultrasonic (+) shield

D ultrasonic (-) clear

Note: Cutting or splicing the sensor cable may cause instrument malfunction and void the warranty.

Remote Ultrasonic Connection

A Remote Ultrasonic factory-installed Option is available (P/N 3170) which allows for the extension of the ultrasonic sensor cable (see Figure 5).

6.1.2 Downlooking Ultrasonic Depth Sensor Programming

The downlooking ultrasonic depth sensor does not require specific programming, unless more than one sensor option is connected to the meter. When more than one sensor option is connected:

1. From the Main Menu, select OPTIONS>LEVEL SENSOR.

Select Ultra-Sonic using the

CHANGE CHOICE soft key, then press the ACCEPT soft key.

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Sensor Installation

RED BLK

GRN BLK RED WHT

Shield

Clear

Figure 5 Remote Ultrasonic Sensor Option

1 Enclosure 13.97 x 22.86 x 4.0 cm (5.5 x 9.0 x 4.0 in.) 3 To flow meter 5 Cable (P/N 2716)

2 Customer-supplied conduit to 950 flow meter. 4 Cable (P/N SE 818) 6 Ultrasonic Transducer

6.1.3 Downlooking Ultrasonic Depth Sensor Calibration

Calibrate the current water level via one of two methods; Liquid Depth or Sensor Height. An Invisible Range can also be set which allows the transducer to ignore reflections from

6.1.3.1 Liquid Depth

obstructions between the sensor and the water surface, such as ladder rungs, channel side walls, etc. Each method has its own advantages and disadvantages; selecting the proper method will depend upon the site conditions. Calibrate the ultrasonic sensor each time the sensor is installed at a new site.

This method requires the depth of liquid in the channel that is contributing to flow. In a round pipe, the entire depth typically contributes to flow. In a weir, only the depth that is flowing over the weir plate contributes to flow. Many flumes have specific requirements, refer to Working with Primary Devices on page 105. Level Depth calibration is primarily used when:

Access is available to the primary device for a physical measurement of the liquid depth, and when water is flowing during installation of the 950 Flow Meter (channel is not dry).

Note: Always re-check the Level Adjust when re-installing the flow meter.

1. From the Main Menu, select OPTIONS>ADVANCED OPTIONS>

CALIBRATION>ULTRASONIC SENSOR.

2. Select Calibrate U-Sonic using the UP and DOWN soft keys. Press SELECT.

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Sensor Installation

3. Select Standard as the type of Ultrasonic Transducer using the CHANGE CHOICE soft

key. Press

Temperature Time Constant

The speed of sound in air varies with the temperature of the air. The ultrasonic sensor is equipped with temperature compensation to help eliminate the effect of temperature variation under normal site conditions. The transducer must be equal to the ambient air temperature at the site prior to calibration for optimum results. The manufacturer also recommends that sensors be shielded from direct sunlight for this reason.

4. Enter the ambient air temperature at the transducer location. For optimum results,

allow enough time (100 minutes) to ensure that the sensor is at equilibrium with the surrounding ambient temperature. Press

5. Select the Liquid Depth method and enter the new level.

6. Take a physical measurement of the liquid depth and enter the value.

ACCEPT to continue.

7. Press

6.1.3.2 Sensor Height

This method requires you to enter the distance between the face of the ultrasonic sensor and the zero flow point in the primary device. The zero flow point in a primary device is the level at which flow ceases. In a round pipe the zero flow point would typically be the invert or bottom of the pipe. In a V-notch weir the zero flow point occurs when the liquid behind the weir is level with the bottom of the ‘V’. (There would still be liquid behind the weir plate but it would not be contributing to flow). Sensor Height calibration is generally used when access to the primary device is difficult (such as confined space entry in a manhole) or there is no liquid flowing during installation of the flow meter.

1. From the Main Menu, select

2. Select Calibrate U-Sonic using the UP and DOWN soft keys. Press SELECT.

3. Select Standard as the type of Ultrasonic Transducer using the

4. Enter the ambient air temperature at the transducer location. For optimum results,

5. Select the Sensor Height method and enter the new level.

ACCEPT when finished.

OPTIONS>ADVANCED

OPTIONS>CALIBRATION>ULTRASONIC SENSOR.

CHANGE CHOICE soft

key. Press

ACCEPT to continue.

allow enough time (100 minutes) to ensure that the sensor is at equilibrium with the surrounding ambient temperature. Press

to continue.

6. Enter the distance from the face of the transducer to the zero flow point of the

primary device.

7. Press

ACCEPT when finished.

6.1.3.3 Setting the Invisible Range

1. From the Main Menu, select OPTIONS>ADVANCED

OPTIONS>CALIBRATION>ULTRASONIC SENSOR.

2. Select the Invisible Range option using the UP and DOWN soft keys. Press SELECT to

continue.

3. Enter the Distance to End of the Invisible Range using the keypad.

4. Select either inches or centimeters using the

must be greater than the minimum deadband of 25.4 cm (10 in.) for the 75 kHz sensor and 38.1 cm (15 in.) for the 50 kHz sensor.

5. Press

ACCEPT when finished.

CHANGE UNITS soft key. The distance

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Sensor Installation

6.2 In-Pipe Zero Deadband Ultrasonic Depth Sensor

The in-pipe zero deadband ultrasonic depth sensor is used in pipes where level measurement near the top of the pipe is desired. The sensor will read the level until liquid reaches from the bottom of the sensor housing.

6.2.1 In-Pipe Zero Deadband Ultrasonic Depth Sensor Connection

Table 12 In-Pipe Zero Deadband

Pin Assignments

Pin Signal Description Wire Color

A temperature (+) red

B temperature (-) black

C ultrasonic (+) shield

D ultrasonic (-) clear

Ultrasonic Depth Sensor Connector

6.2.2 Programming the In-Pipe Zero Deadband Ultrasonic Depth Sensor

The in-pipe zero deadband ultrasonic depth sensor does not require operator programming, unless more than one sensor option is connected to the 950 Flow Meter. When more than one sensor option is connected:

1. From the Main Menu, select

2. Select Ultra-Sonic Sensor using the CHANGE CHOICE soft key, then

press

ACCEPT.

OPTIONS > LEVEL SENSOR

6.2.3 Beam Angle

The narrow beam of sound that emanates from the bottom of the in-pipe ultrasonic sensor spreads out at an angle of ±12° (-10 dB) as it travels away from the sensor. This means that if the sensor is mounted too high above a narrow channel, the beam may be too wide when it reaches the bottom of the channel. This may cause false echoes from the sides of the channel walls.

6.2.4 Calibrating the In-Pipe Zero Deadband Ultrasonic Depth Sensor

Calibrate the in-pipe sensor each time the sensor is installed at a new site. Calibrate the in-pipe via one of two methods; Liquid Depth or Sensor Height. Each method has its own advantages and disadvantages. Liquid Depth calibration is the recommended calibration method. Use the sensor height method only when Liquid Depth calibration is not an option. An Invisible Range can also be set which allows the transducer to ignore reflections from obstructions between the sensor and the water surface, such as ladder rungs, channel side walls, etc.

1. From the Main Menu, select

2. Highlight Calibration, using the UP and DOWN soft keys. Press SELECT.

3. Highlight Ultra-Sonic Sensor, using the

continue.

4. Highlight Calibrate U-Sonic Sensor and press

5. Select the type of ultrasonic transducer (In-Pipe), using the

key.

6. Press

ACCEPT to continue.

OPTIONS > ADVANCED OPTIONS.

UP and DOWN soft keys. Press SELECT to

SELECT.

CHANGE CHOICE soft

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Sensor Installation

7. Enter the ambient air temperature at the transducer location. For optimum results,

allow enough time (100 minutes) to ensure that the sensor is at equilibrium with the surrounding ambient temperature.

8. Press

ACCEPT to continue.

Liquid Depth

Liquid depth requires knowing the level or depth of the liquid in the channel that is contributing to flow. Liquid depth calibration is the recommended calibration method for the in-pipe ultrasonic sensor.

Continue from Step 8, above:

1. Select the Liquid Depth method.

2. Take a physical measurement of the liquid depth (head) and enter the value.

3. Press

ACCEPT when finished.

Sensor Height

Sensor height calibration is generally used when access to the primary device is difficult (such as confined space entry in a manhole) or when there is no liquid flowing during installation of the flow meter. This calibration method requires compensation for the internal deadband in the sensor housing. Measurement uncertainty increases to 1.07 cm (0.035 ft) for a ±30 cm (±1 ft) change in level from the calibration point.

Use this method only if the Liquid Depth method is not an option.

Continue from Step 8, above:

1. Measure the distance from the bottom of the sensor to the zero flow point. Add 18 cm

(7.09 in.) to the measured distance to obtain the total zero flow distance for the in-pipe sensor. Refer to Figure 6 on page 38.

2. Select the Sensor Height calibration method and enter the total zero flow distance

from Step 1.

3. Press

ACCEPT when finished.

Setting the Invisible Range

Note: When programming the invisible range, 18 cm (7.09 in.) must be added to the desired range to compensate for the internal deadband distance between the sensor, the reflector, and the bottom of the sensor housing.

The 950 Flow Meter is equipped with an invisible range feature to prevent false echoes from tops of channel walls, ladder rungs, shelves, etc. A user-selected range is defined that is invisible to the flow meter. Do not extend the invisible range to where it meets or overlaps the highest expected level in the channel. Have a gap of at least 5 cm (2 in.) between the invisible range and the highest expected level. Only objects beyond the invisible range can be detected.

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Sensor Installation

Figure 6 Side View of In-Pipe

1 Minimum distance to reflecting obstruction (2 m (82 in.)) 4 Ultrasonic Sensor

2 Distance from Sensor (Range: 0 to 4.08 m (13.4 ft)) 5 Internal Deadband (18 cm (7.09 in.))

3 45° Deflector

1. From the Main Menu, select

ULTRASONIC SENSOR.

2. Select the Invisible Range option using the UP and DOWN soft keys. Press SELECT to

continue.

3. Enter the Distance to End of the Invisible Range using the keypad.

4. Select either inches or centimeters using the

when finished.

6.3 Submerged Area/Velocity Sensor

Submerged Area/Velocity sensors can measure level and velocity simultaneously.

6.3.1 Bare Lead Sensor Cables

Bare lead sensor cables are used in those cases where the cable will be run through a conduit. When conduit is used, it is recommended that the conduit be 1-inch or larger.

6.3.2 Junction Box Connection Procedure

Connect the bare leads to the flow meter using a junction box (P/N 4730). This junction box is a physical connection point for the sensor wires and breather tubing.

Refer to Figure 7 for the following procedure.

1. Remove the four cover screws, cover, and cover gasket from the junction box.

Unscrew the cable-clamp hex nut on the box enough to allow insertion of the sensor cable.

OPTIONS>ADVANCED OPTIONS> CALIBRATION>

CHANGE UNITS soft key. Press ACCEPT

2. Insert the sensor cable into the box and make connections. Refer to the wiring

diagram on the inside cover of the box, connect each wire to its corresponding terminal screw, observing the wire colors listed in that diagram. See Table 13.

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Sensor Installation

3. Connect the tubing in the cable to the clear tubing in the box that is already

connected to the exit fitting.

4. Slip the cable in or out of the box sufficiently to create a slight loop in the wires and

tubing to allow strain relief and then tighten the cable-clamp hex nut.

5. Being careful to align the cover gasket (P/N 2101), reattach the cover and gasket to

the box with the screws.

6. Connect clear tubing between the top tubing nipple on the desiccant canister and the

brass tubing nipple on the junction box.

7. Connect the short, connector-terminated cable to the “velocity” connector on the flow

meter.

Figure 7 Junction Box Probe and Cable Connection

1 Connect to meter 4 Gasket (P/N 2101) 7 Connect sensor cable wires

2 Connect to desiccant tubing 5 Insert tubing (P/N 4628)

3 Cover 6 Connect to sensor cable

Table 13 Submerged Area/Velocity Sensor Connection Pin Assignments

Pin Signal Description Wire Color

A +12 V dc red

B ground green

C receive (ground) b/w shield

D receive (+) b/w center

E transmit (ground) black shield

F transmit (+) black center

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Sensor Installation

Table 13 Submerged Area/Velocity Sensor Connection Pin Assignments

Pin Signal Description Wire Color

G depth (-) black

H depth (+) white

6.3.3 Submerged Area/Velocity Sensor Programming

1. If the flow meter is equipped with multiple sensors, from the Main Menu, select

OPTIONS>LEVEL SENSOR.

2. Select Submerged Xducer using the CHANGE CHOICE soft key, then press ACCEPT.

3. From the

MAIN MENU, select SETUP>MODIFY SELECTED ITEMS.

4. Highlight Velocity Direction using the UP and DOWN soft keys. Press SELECT to

continue.

5. Set the velocity direction (upstream, downstream, or always positive) using the

CHANGE CHOICE soft key.

6. Press

7. Highlight Velocity Units using the

ACCEPT to continue.

UP and DOWN soft keys. Press SELECT to continue.

8. Set the Velocity Units (fps or m/s), using the

to continue.

9. Highlight Velocity Cutoff, using the

UP and DOWN keys. Press SELECT to continue.

10. Read the Velocity Cutoff information screen. Press any key to continue.

11. Set the Velocity Cutoff using the numeric keypad. Press

12. Set the Velocity Default, using the numeric keypad. Press

go back to the Setup Menu or the Main Menu key to return to the beginning.

6.3.4 Submerged Area/Velocity Sensor Calibration.

Note: The data is constant if the difference between the level reading of the flow meter and the independent verification is constant; recalibration is not required.

The manufacturer recommends calibrating the Submerged Area/Velocity Sensor when:

UP and DOWN soft keys. Press ACCEPT

ACCEPT to continue.

ACCEPT. Press RETURN to

• The sensor is first used.

• Installing a new or different sensor on a flow meter or input receptacle.

• The difference between the level reading of the flow meter and the independent

verification (measurement with a dipstick and ruler) is increasing.

Note: Errors are caused by variation in site conditions and measurement abilities. These errors may cause slight changes in the difference, therefore, not indicating a true change in the difference.

1. From the Main Menu, select OPTIONS > ADVANCED OPTIONS > CALIBRATION >

SUBMERGED PROBE.

2. Place the sensor flat on a table top or floor with the sensor (the plate with holes)

facing down onto the surface.

3. Press any key to continue.

6.4 Low Profile Velocity-Only Sensor

The Low Profile Velocity-Only Sensor is an extremely low-profile velocity sensor. It does not measure level; therefore it is usually used in conjunction with the in-pipe ultrasonic

Page 43

sensor. The streamlined shape of the velocity-only sensor allows velocity measurement in very low-flow conditions. When used in conjunction with a level sensor, the meter can calculate flow.

6.4.1 Low Profile Velocity-Only (Wafer) Sensor Connection

Note: Use bare-lead sensor and junction box for conduit installation.

The low profile velocity-only sensor connector is located on the right side of the flow meter (when facing the flow meter) and is labeled Velocity. The connector is keyed and can only be inserted in the proper orientation (key up). See Table 14 for pin assignments.

Table 14 Submerged Velocity Sensor Connector Pin Assignments

Pin Signal Description Wire Color

A+12 V dc red

B ground green

C receive (shield) b/w shield

D receive (+) b/w center

E transmit (shield) black shield

F transmit (+) black center

Sensor Installation

6.4.2 Low Profile Velocity-Only Sensor Programming

1. From the MAIN MENU, select SETUP>MODIFY SELECTED ITEMS.

2. Highlight Velocity Direction using the UP and DOWN soft keys. Press SELECT to

continue.

3. Set the velocity direction (upstream, downstream, or always positive) using the

CHANGE CHOICE soft key.

4. Press

5. Highlight Velocity Units using the

ACCEPT to continue.

UP and DOWN soft keys. Press SELECT to continue.

6. Set the Velocity Units (fps or m/s), using the

to continue.

7. Highlight Velocity Cutoff, using the

UP and DOWN soft keys. Press SELECT to

continue.

8. Read the Velocity Cutoff information screen. Press any key to continue.

9. Set the Velocity Cutoff using the keypad. Press

10. Set the Velocity Default, using the numeric keypad. Press

go back to the Setup Menu or the Main Menu key to return to the beginning.

6.4.3 Low Profile Velocity-Only Sensor Calibration

No calibration is required for the velocity sensor. The transmit frequency is fixed with a highly accurate quartz crystal-controlled frequency generator that cannot be adjusted.

UP and DOWN soft keys. Press ACCEPT

ACCEPT.

ACCEPT. Press RETURN to

6.5 Submerged Depth Only Sensor

The submerged depth only pressure sensor is a pressure transducer that contains a titanium diaphragm. As the water pressure increases, (with increasing level in the flow stream) the diaphragm is deflected, or pushed, against a solid state device called a strain gauge. The strain gauge converts the pressure against the diaphragm to a voltage. As the level in the flow stream increases, the voltage coming from the submerged pressure

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Sensor Installation

sensor increases. The voltage is read by the microprocessor in the 950 Flow Meter at a regular interval and converted to a number which represents the level in the flow stream. The level reading can then be converted by the meter to a flow rate based on the mathematical formula for the selected primary device.

6.5.1 Submerged Depth Only Sensor Connection

The submerged depth only sensor connector is located on the left side of the flow meter and is labeled Sub Probe. The connector is keyed and can only be inserted in the proper orientation (key up). See Table 15 for pin assignments.

Table 15 Submerged Pressure Sensor Interface Pin Assignments

Pin Signal Description Wire Color

AV (+) red

B signal (+) yellow

C signal (-) green

D ground black

6.5.2 Submerged Depth Only Sensor Programming

1. From the Main Menu, select OPTIONS>LEVEL SENSOR.

2. Select Submerged Xducer using the CHANGE CHOICE soft key, then press ACCEPT.

6.5.3 Submerged Depth Only Sensor Calibration

The submerged depth only sensor does not need to be calibrated for each use. In general, calibrate the probes:

• The first time a new meter and sensor is used

• Whenever a sensor is replaced with another sensor

• Every 6 months

Submerged depth only sensor calibration requires a graduated cylinder or bucket with at least 16 cm (6 in.) of water and a ruler. Calibrating the submerged sensor characterizes the 950 Flow Meter electronics to the unique characteristics of each individual sensor. In addition, the calibration compensates for any sensor drift that may occur over time (6 months or greater) as the materials in the sensor age.

To ensure optimum accuracy, calibrate the meter approximately twice per year or when changing to a different submerged sensor.

1. From the Main Menu, select

SUBMERGED PROBE.

2. Choose the orientation that the sensor will be mounted in the flow stream, horizontal

or vertical, using the

CHANGE CHOICE soft key. Use this same position during

calibration to ensure optimum accuracy. Press

OPTIONS > ADVANCED OPTIONS > CALIBRATION >

ACCEPT to continue.

11:00 AM 21 - APR - 01 CALIBRATION

CHANGE

ACCEPT ORIENTATION OF

SUBMERGED PROBE:

HORIZONTAL

CANCEL

SELECT APPROPRIATE UNITS

CHOICE

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Sensor Installation

Horizontal Vertical

3. Lift the sensor out of the water and hold it in the air in the same orientation that you

selected in the previous step (horizontal or vertical) (Figure 8). Press continue.

Figure 8 Lifting the Sensor Out of the Water

4. Follow the either the vertical or horizontal procedure below.

Vertical Orientation Only

a. Place the sensor under at least 16 cm (6 in.) of water in a vertical orientation.

Make sure the sensor is stable and not moving around. Press continue.

ACCEPT to

b. Carefully measure the depth (D1) from the surface of the water to the first weld

mark that encircles the sensor body just above the breather vent holes (Figure 9). The weld mark indicates the location of the internal diaphragm.

c. Enter the depth (D1) using the numeric keypad then press

ACCEPT when done.

Figure 9 Measuring Submerged Depth, Vertical Orientation

1 Gray band 2 Breather vents 3 Detachable nose cone

Horizontal Orientation Only

Note: Always check the Level Adjust when reinstalling the flow meter following a calibration.

a. Place the sensor under at least 16 cm (6 in.) of water in a horizontal orientation.

Make sure the sensor is stable and not moving around. Press

ACCEPT to

continue.

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Sensor Installation

6.6 Bubbler

b. Measure the depth from the bottom of the bucket to the surface of the water (D1)

(Figure 10) and enter the value using the numeric keypad. Press

ACCEPT to

continue.

Figure 10 Measuring Submerged Depth, Horizontal Orientation

The 950 Bubbler Flow Meter utilizes the bubbler method of level measurement. A length of tubing is placed in the flow stream at the proper location for head measurement. A small amount of air is continuously pushed through the tubing and bubbles slowly come out the end. The pressure in the tubing changes in proportion to the liquid level in the flow stream. The 950 Flow Meter reads the this pressure and converts it to a level reading. The 950 Flow Meter will accurately measure the level in the channel as long as the end of bubbler line remains below the zero level point of the channel. After measuring the level, the 950 microprocessor converts the level reading to a flow rate based on the user defined characteristics of a primary device.

6.6.1 Bubbler Connections

Note: Note: To connect a level-only bubbler, push the 1/8” I.D. vinyl tubing (P/N3807) onto the bubbler line port and the other tubing end in the flow stream.

The Depth Only and bubbler Area/Velocity Sensor connector, bubbler line connection, and air dryer canisters are located on the right side of the flow meter. A small diameter tube is contained within the sensor cable to supply air from the 950 Flow Meter to the sensor in the flow stream. See Figure 11.

Figure 11 Bubbler Connections

1 Right-side of 950 meter 2 Bubbler line connection 3 Velocity connection

Three ports on the 950 Flow Meter pertain to air flow for bubbler operation:

• Intake Port—This port supplies fresh air to the internal air pump. The air is drawn

through a dryer tube consisting of two hydrophobic filters and a desiccant material that removes moisture and dirt from the incoming air.

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Sensor Installation

• Reference Port—This port provides a reference to atmosphere. The flow meter

measures level by comparing the back pressure against the bubble in the bubbler line with ambient air pressure. As the water level increases, the back pressure pushing against the bubble increases.

The transducer first reads the pressure in the bubbler line, then, at regular intervals, switches to the reference port to compare it to the atmospheric pressure. This pressure difference is converted to a number which represents the liquid level. At a regular interval, both the bubbler port and the reference port are switched to open air together and electronically zeroed to eliminate any drift due to changing barometric pressure.

If the flow meter is to be located where there is any threat of temporary submersion you should attach a length of ¼-in. ID tubing to both the reference port and the intake port barbed fittings. Route the ends of this tubing to a safe area that is free from the possibility of submersion. Reattach both desiccant cartridges to the tubing, with the cartridge openings facing downward to ensure that moisture, condensation, and/or precipitation does not accumulate in the vent openings of the cartridge. This precaution will protect the air pump and internal plumbing systems from water damage. Do not leave the desiccant cartridges with the vent openings facing up!

• Bubbler Line Port—The bubbler line connects from this port to the measurement

point in the primary device. Push the brass barbed fitting. No clamps are required.

6.6.1.1 Meter-End Cable Terminations

Bubbler Area/Velocity sensors are terminated with a velocity connector and bubbler tube or with bare leads and the bubbler tube. Use the bubbler with bare leads at sites where the sensor cable is routed through a conduit.

1. At the meter end of the conduit, connect the cable to the meter with a junction box

(Figure 7 in section 6.3.2 on page 38).

2. Connect the bubbler tube to the brass tubing coupler in the junction box.

3. Connect another section of tubing from the brass coupler to the top connector on the

Intake Port Dryer Canister.

4. Connect the velocity leads to the junction box terminals as indicated on the junction

box.

6.6.1.2 Routing the Bubbler Line

There are several important things to consider when routing the bubbler line.

• Route the tubing so that it slopes downward from the flow meter or sensor cable to the

flow stream whenever possible. This assures that any condensation that forms in the tubing will drain out of the tube. If moisture collects in a low spot in the tubing it could restrict the flow of air and cause erroneous readings.

/8” (3.17 mm) ID vinyl bubbler tubing over the

• Don't use more bubbler line than you need. Remove excess coils of tubing to

decrease the likelihood of moisture problems, cuts, or kinks.

• Use a single continuous length with no spliced connections to eliminate the possibility

of air leaks.

• Use care not to cut or kink the tubing during installation.

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Sensor Installation

6.6.2 Bubbler Installation

6.6.2.1 Installation Guidelines

• Locate the end of the bubbler line at the proper head measurement point for that

primary device. All weirs and flumes either come equipped or can be retrofitted with a connection for the bubbler line. Stainless steel bubbler line extensions are available where no provisions have been made. Optional mounting bands with built-in bubbler tube connections for use in round channels are also available.

• Place the end of the bubbler perpendicular (at a right angle) to the flow stream.

• Locate the end of the bubbler line 2.5 to 5 cm (1 to 2 in.) below the lowest expected

level in the channel. Pressing the reading to the actual level in the channel.

• In a weir or flume, use a stilling well. Silt and sediment build-up in the stilling well is

unlikely.

• In round pipes, use the manufacturer’s mounting bands or locate the bubbler line

along the wall in a slot or groove and cover it so it does not protrude into the flow stream and collect debris.

LEVEL ADJUST key will calibrate the displayed

6.6.3 Depth Only and Bubbler Area/Velocity Calibration

Bubbler calibration requires a graduated cylinder with at least 16 cm (6 in.) of water, a ruler, and 1 m (3 ft) of bubbler line.

The bubbler is calibrated at the factory and characterizes the electronics to the internal pressure transducer. The internal pressure transducer is the device that converts the pressure in the bubble line to a voltage that is read by the microprocessor. Recalibrate the sensor at least once per year to ensure optimum accuracy.

When selecting Bubbler from the calibration menu you are presented with three choices:

• Set Bubbler Rate

• Calibrate Bubbler

• Auto-Purge

Set Bubble Rate

Note: Excessive bubble rates could cause an increase in the level reading due to friction on the bubbler line. Always readjust the level using the Bubble Rate. This will compensate for errors induced by changes in the bubble rate.

This setting allows you to vary the rate of bubbles coming from the end of the bubbler line. Some streams with a high solids or grease content may require a slightly higher bubble rate to keep debris from plugging the bubbler line. However, setting an excessively high bubble rate to keep the line clear is not advised. Instead, use the Auto Purge feature. This applies a high pressure purge to the bubber line at a regular interval.

LEVEL ADJUST key after making changes to the

The recommended bubble rate is one bubble per second. Check the bubble rate in a depth of water that is typical for the installation and adjust if necessary. When setting the bubble rate at a location other than the installation site, use the same inside diameter and length of the bubbler line that will be used at the site or the bubble rate may be different when the flow meter is actually installed.

Note: High bubble rate and/or short Auto-Purge intervals will decrease battery life due to the increased air pump run time required to replenish the air reservoir. When operating the battery

Page 49

Sensor Installation

power, keep bubble rates at one bubble per second. Set the Auto-Purge intervals to at least 30 minutes.

To set the bubble rate, highlight the SET BUBBLE RATE selection using the UP and DOWN arrow soft keys, then press the 5, then press the

ACCEPT soft key to save the changes.

Calibrate Bubbler Procedure

SELECT soft key. Enter the bubble rate number from 1 to

1. From the Main Menu, select

OPTIONS>CALIBRATION>BUBBLER.

OPTIONS>ADVANCED

2. Set the Bubble Rate to 2 or 3 (or approximately 1 bubble per second).

3. Install 3 ft of new bubbler tubing from the flow meter to a graduated cylinder filled with

at least 16 cm (6 in.) of water. Make sure that the tubing is held securely in the cylinder and cannot move during calibration.

Note: Always recheck the Level Adjust when reinstalling the flow meter following a calibration. (See

Figure 1 on page 16.)

4. Select CALIBRATE BUBBLER from the Bubbler Calibration menu. Carefully measure

the depth of the bubbler line with a ruler. Measure from the surface of the water to the bottom of the bubbler line (ignore the bubble).

5. Enter the new depth using the numeric keypad. Press

ACCEPT. The current reading

is shown for reference. This depth value is always entered in the unit of measure that was selected in the Setup menu (inches centimeter, etc.)

Auto Purge

When enabled, Auto-Purge will cause a one-second high pressure purge of the bubble line on a user-defined time interval. This purge will clear debris such as silt from around the end of the bubble line, and to prompt trouble-free and accurate operation, even in high solids applications. Select press

CHANGE CHOICE to enable or disable Auto-Purge. If enable is selected, the

AUTO-PURGE from the bubbler calibration menu and

Auto-Purge interval screen is then displayed. Enter an interval between 5 and 90 minutes using the numeric keypad, then press

ACCEPT.

Page 50

Sensor Installation

Page 51

Section 7 Optional Device Installation

This section describes how to set up a rain gauge to the 950 Flow Meter as well as how to install the optional water quality probes (pH, ORP, Dissolved Oxygen, Conductivity, Temperature Probe).

7.1 Rain Gauge

7.1.1 Rain Gauge Connection

An external “tipping bucket” rain gauge (such as P/N 2149) can be connected to the Rain Gauge connector of the 950 Flow Meter. The rain gauge provides a dry contact closure to the flow meter.

Table 16 Rain Gauge Connector Pin Assignments

Pin Signal Description

A +12 V dc source output

B not used

C +12 V dc pulse input

D not used

E not used

F not used

7.1.2 Rain Gauge Programming

1. From the Main Menu, select OPTIONS>ADVANCED OPTIONS>DATALOG.

2. Highlight SELECT INPUTS using the UP and DOWN arrow soft keys and then press

SELECT.

Note: If logging is enabled on any channel, that channel will have an arrow in front of the channel name to signify that the channel is logged.

3. Highlight Rainfall using the UP and DOWN soft keys, then press SELECT.

4. Press

5. Enter a logging interval using the numeric keypad, then press

6. Select Rainfall Units (in. or cm). Press

7. Select another channel to configure, press

CHANGE CHOICE to cycle between Logged and Not Logged, then press

ACCEPT.

intervals are shown on the status bar along the bottom edge of the display.

MAIN MENU function key to return to the Main Menu.

ACCEPT. Valid logging

ACCEPT to continue.

RETURN to back up one step, or press the

Page 52

Optional Device Installation

7.2 pH Probe

7.2.1 pH Probe Connection

The pH probe consists of five wires, three for the pH probe and two for the temperature probe. Since the pH probe reading needs to compensate for temperature variation, there is a temperature probe built into every pH probe.

1. Attach the clear wire to either screw on the terminal strip labeled GLASS.

2. Attach the black wire on the shield of the cable to the REF screw on the other

terminal strip.

Table 17 pH Connector Pin Assignments

Pin Signal Description

A+5 V dc

B ground

C reference

DpH/ORP

E5 V dc

F-RTD

3. Attach the red wire to the GND screw on the terminal strip.

4. Attach the green and yellow wires to the screws labeled RTD (Resistance

Temperature Detector).

Note: The green and yellow wires can be attached to either one of the RTD terminal screws because there is no polarity present.

7.2.2 pH Probe Programming

1. From the Main Menu, select OPTIONS>ADVANCED OPTIONS>DATALOG.

1. Highlight Select Inputs using the UP and DOWN keys, then press SELECT.

2. Highlight pH using the

3. Press

CHANGE CHOICE to cycle between Logged and Not Logged, then press

ACCEPT.

4. Enter a logging interval using the numeric keypad, then press

intervals are shown on the status bar.

5. Select another channel to configure or press

MAIN MENU function key to return to the Main Menu.

7.2.3 pH Probe Calibration

Once the pH probe is connected and programmed, calibrate the pH probe. Calibrating the pH probe requires a thermometer and any two of the following buffer solutions: 4, 7, or 10 pH. The pH probe is an application sensitive device. When used in harsh environments, the accuracy and life expectancy of the probe decreases.

UP and DOWN keys, then press SELECT.

ACCEPT. Valid logging

RETURN to back up one step. Press the

Calibrate the pH probe each time they are cleaned or replaced. Regular inspection and comparison to a hand-held pH meter can help determine the optimum cleaning and calibration schedule for your application.

1. From the Main Menu, select

OPTIONS > ADVANCED OPTIONS > CALIBRATION > pH.

2. Place the pH probe into the first buffer solution. Press any key to continue.

Page 53

Optional Device Installation

3. Enter the temperature of the first buffer solution using the numeric keypad. Press

ACCEPT to continue.

4. Press the

pH), then press

5. Remove the probe from the first buffer solution, rinse it under distilled water and

place it into the second buffer solution (4, 7, or 10 pH, different from the first buffer used). Press any key to continue.

6. Press

CHANGE CHOICE to select the pH for the second buffer solution, then press

ACCEPT to continue.

A “pH Calibration Failed-Gain And/Or Offset Out of Range, Try Again” error message will be displayed if the pH probe is damaged, cannot be calibrated, or if the buffer solutions do not fall within an acceptable range.

Make an attempt at reading the second buffer solution after pressing a key. If this fails, it is likely that you have a poor pH probe or poor buffer solutions. Try a new set of buffer solutions. If that fails try a different pH probe.

7.3 ORP Probe

7.3.1 ORP Probe Connection

CHANGE CHOICE to select the pH for the first buffer solution (4, 7, or 10

ACCEPT to continue.

Table 18 ORP Connector Pin Assignments

Pin Signal Description

A+5 V dc

Bground

C reference

DpH/ORP

E -5 V dc

FRTD

Note: There is no temperature sensor on the ORP sensor.

The ORP probe consists of three wires: a clear wire, a black wire, and a red wire. The pre-amp required interface is a 6-pin connector on one end and a junction box with terminal strips on the other end (P/N 2078).

1. Attach the clear wire to either screw on the terminal strip labeled GLASS.

2. Attach the black wire to the REF screw on the other terminal strip.

3. Attach the red wire to the GND screw on the terminal strip.

7.3.2 ORP Programming

1. From the Main Menu, select OPTIONS>ADVANCED OPTIONS>DATALOG.

2. Highlight Select Inputs using the UP and DOWN soft keys and then press SELECT to

continue.

3. Highlight ORP using the

4. Press

ACCEPT to continue.

5. Enter a logging interval using the numeric keypad, then press

intervals are shown on the status bar along the bottom edge of the display.

UP and DOWN soft keys, then press SELECT to continue.

CHANGE CHOICE to cycle between Logged and Not Logged, then press

ACCEPT. Valid logging

Page 54

Optional Device Installation

6. Select another channel to configure or press RETURN to back up one step. Press the

MAIN MENU function key to return to the Main Menu.

7.3.3 ORP Preamplifier/Junction Box Calibration

Calibration of the ORP input circuit requires a source of dc voltage between 500 and 2000 m V dc. The reference voltage must be applied to the ORP input terminals on the preamplifier/junction box during calibration. A regulated dc power supply or a standard “C” cell battery (1500 mV dc) make excellent sources for reference voltage.

1. From the Main Menu, select

2. Install the ORP junction box on the sampler with the ORP probe removed.

3. Apply a positive reference voltage to the ORP probe terminals in the junction box,

using either a 1.5 V dc “C” cell battery or a regulated power supply.

4. Attach the positive battery terminal to the terminal block screw labeled “glass” and

the negative battery terminal to the terminal block screw labeled “ref”.

7.4 Dissolved Oxygen Probe

The DO/Conductivity option is available with or without additional analog inputs. See

Analog Communications on page 64 for wiring and configuration.

7.4.1 Dissolved Oxygen Probe Connection

The pre-amp (P/N 3369 or 3212) is required. Plug the probe into the pre-amp and plug the pre-amp into the 950 flow meter.

Table 19 Dissolved Oxygen Connector Pin Assignments

Pin Signal Description Wire Color

A +12 V dc white

B signal ground blue

C input 1 (4–20 mA dc) yellow

D input 2 (4–20 mA dc black

E input 3 (4–20 mA dc) red

F dissolved oxygen (+) green

G dissolved oxygen temp. probe(+) gray

H conductivity (+) brown

J conductivity temp. probe purple

K not used orange

OPTIONS > ADVANCED OPTIONS > CALIBRATION > ORP.

7.4.2 Dissolved Oxygen Probe Programming

1. From the Main Menu, select OPTIONS>ADVANCED OPTIONS>DATALOG.

2. Highlight Select Inputs using the UP and DOWN soft keys and then press SELECT.

3. Highlight D.O. using the

4. Press

CHANGE CHOICE to cycle between Logged and Not Logged, then press

ACCEPT.

5. Enter a logging interval using the numeric keypad, then press

intervals are shown on the status bar along the bottom edge of the display.

6. Press

CHANGE CHOICE to select the appropriate units (ppm, ppb, mg/L, sat). Press

ACCEPT to continue.

UP and DOWN soft keys, then press SELECT.

ACCEPT. Valid logging

Page 55

7. Select another channel to configure or press RETURN to back up one step. Press the

MAIN MENU function key to return to the Main Menu.

7.4.3 Dissolved Oxygen Probe Temperature Programming

1. From the Main Menu, select OPTIONS>ADVANCED OPTIONS>DATALOG

2. Highlight Select Inputs using the UP and DOWN soft keys, then

press

SELECT.

Optional Device Installation

3. Highlight D.O. Temp. using the

4. Press

CHANGE CHOICE to cycle between Logged and Not Logged, then press

ACCEPT.

5. Enter a logging interval using the numeric keypad, then press

intervals are shown on the status bar along the bottom edge of the display.

6. Press

CHANGE CHOICE to select the temperature units (°C, °F).

Press

ACCEPT.

7.4.4 Dissolved Oxygen Probe Calibration

Note: The membrane of a charged sensor must be kept moist. If the membrane is allowed to dry completely, the electrolyte film between the membrane and the platinum will evaporate, destabilizing the sensor. If the sensor will be out of water for more than 30 minutes, put a small amount of water in the silicon soaking cap, and install it over the protective guard. Lift the edge of the cap to break the seal as it is being removed. This will prevent a vacuum from forming inside the soaking cap while it is being removed which can result in the membrane becoming stretched.

1. Connect a suitable power supply to the flow meter.

2. Power up the unit by pressing the

3. From the Main Menu, select

4. Enter the ambient air temperature (the current reading is displayed for reference)

using the numeric keypad.

UP and DOWN soft keys, then press SELECT.

ACCEPT. Valid logging

ON button.

OPTIONS > ADVANCED OPTIONS > CALIBRATION > DO.

5. Enter the elevation above sea level for the specific location.

6. Enter the membrane thickness. The operation of the 950 Flow Meter will be affected

by the choice of membrane thickness for the oxygen sensor.

7. For general purpose applications, the 1-Mil membrane is standard. This membrane

allows measurements in the 0 to 20 ppm range of dissolved oxygen and provides the best general purpose trade-off between response time and durability.

8. The 2-Mil membrane can be used to measure up to 40 ppm of dissolved oxygen. Its

increased thickness slows the response time of the sensor, but this membrane has increased resistance to cuts and tears. For this reason, it is recommended for use in wastewater aeration basins where solids in the water are in rapid motion.

9. Enter the chlorinity (salinity) of the flow stream (typical wastewater is zero, sea water

is higher).

10. Place the D.O. probe in open air and press any key. The 950 Flow Meter will wait for

the reading to stabilize before storing the calibration value. The screen will automatically return to the calibration menu.

Calibrating the D.O. Temperature

1. Place the probe and the thermometer in a liquid.

2. Wait for the temperature reading to stabilize, approximately 30 minutes.

3. Enter the actual temperature of the liquid.

Page 56

Optional Device Installation

7.5 Conductivity Probe

7.5.1 Conductivity Probe Connection

The pre-amp (P/N 3369 or 3212) is required. Plug the probe into the pre-amp and plug the pre-amp into the 950 Flow Meter.

Pin Signal Description Wire Color

A +12 V dc white

B signal ground blue

C input 1 (4–20 mA dc) yellow

D input 2 (4–20 mA dc black

E input 3 (4–20 mA dc) red

F dissolved oxygen (+) green

G dissolved oxygen temp. probe(+) gray

H conductivity (+) brown

J conductivity temp. probe purple

K not used orange

Table 20 Conductivity Pin Assignments

7.5.2 Conductivity Probe Programming

1. From the Main Menu, select OPTIONS>ADVANCED OPTIONS>DATALOG.

2. Highlight Select Inputs using the UP and DOWN soft keys and then press SELECT.

3. Highlight Conductivity (COND.) using the

SELECT.

4. Press

CHANGE CHOICE to cycle between Logged and Not Logged, then press

ACCEPT.

5. Enter a logging interval using the numeric keypad, then press

intervals are shown on the status bar along the bottom edge of the display.

6. Press

CHANGE CHOICE to select the appropriate units (mS, uS). Press ACCEPT to

continue.

7. Select another channel to configure or press

MAIN MENU function key to return to the Main Menu.

7.5.3 Conductivity Temperature Programming

Note: Conductivity measurements are only temperature compensated if the conductivity temperature is enabled in the datalog.

1. From the Main Menu, select OPTIONS>ADVANCED OPTIONS>DATALOG.

2. Highlight Select Inputs using the UP and DOWN soft keys and then press SELECT.

UP and DOWN soft keys, then press

ACCEPT. Valid logging

RETURN to back up one step. Press the

3. Highlight Conductivity Temperature (COND. TEMP.) using the

keys, then press

4. Press

CHANGE CHOICE to cycle between Logged and Not Logged, then press

ACCEPT.

SELECT.

5. Enter a logging interval using the numeric keypad, then press

UP and DOWN soft

ACCEPT. Valid logging

intervals are shown on the status bar along the bottom edge of the display.

Page 57

6. Press CHANGE CHOICE to select temperature units (°C, °F).

Press

ACCEPT.

7.5.4 Conductivity Probe Calibration

1. From the Main Menu, select OPTIONS > ADVANCED OPTIONS > CALIBRATION >

CONDUCTIVITY.

2. Clean and dry the probe.

3. Place the sensor and thermometer in the calibration solution. The temperature

sensor is located in the middle of the sensor body allowing the probe to be completely submerged in the solution.

4. Allow the sensor to stabilize in the solution about 10 minutes to ensure that the probe

and the solution are the same temperature.

5. Enter the temperature correction factor or enter zero (0) for no correction factor.

Note: The temperature correction factor is used to compensate for the effects of temperature on the conductivity readings at the point of installation. The conductivity of a solution is temperature sensitive. Therefore the actual conductivity of the solution will change with the temperature. Each site may have a different correction factor depending on the major constituent of the flow stream. This is not used for calibration and has no effect on the calibration of the sensor. Below are some examples of compensation factors of various liquids.

Optional Device Installation

• 0.96%/°C 5% Sulfuric Acid

• 1.88%/°C Dilute Ammonia

• 1.91%/°C ‘Typical’ Wastewater

• 1.97%/°C Potassium Chloride

• 2.12%/°C Salt (Sodium Chloride)

• 2.84%/°C 98% Sulfuric Acid

• 4.55%/°C Ultra-pure Water

6. With the sensor still in the calibration solution, press any key. Wait for the sensor to

stabilize. Calculate the actual conductivity of the calibration solution. If using the KCl solution provided by the manufacturer, make your selection from Table 21 on

page 56. If using a solution other than

1.0 mS @ 25 °C KCl available from the manufacturer, you must calculate the conductivity of the solution using temperature correction factors. See the example below.

Example:

The KCl calibration solution is 1.0 mS. at 25°C. The temperature correction factor for KCl is 1.97%/°C. If the actual temperature of the KCl at the time of calibration is 18.4 °C, then the solution has a conductivity value of 0.870 mS.

a. Find the difference between the labeled temperature and the actual temperature

of the calibration solution at the time of calibration.

25 °C – 18.4 °C = 6.6 °C

b. Multiply the difference (6.6) by the correction factor per °C (1.97% or 0.0197).

6.6 °C x 0.0197/°C = 0.13002

c. If the calibration temperature is lower than the labeled value, then subtract that

value from the standard (1.0 mS) to get the actual value to be used for calibration.

1.0 mS - (correction factor) 0.13002 = 0.86998 mS

d. If the calibration temperature is higher than the labeled value, then add that value

to the standard (1.0 mS) to get the actual value to be used for calibration.

Page 58

Optional Device Installation

7. Using the value that was calculated in step 6, enter the conductivity of the solution

then press

Calibrating the Conductivity Temperature This calibration is necessary only when logging temperature.

1. Place the probe in a liquid.

2. Wait for the temperature reading to stabilize, approximately 30 minutes.

3. Enter the actual temperature of the liquid (the current reading is shown for reference).

Temperature calibration is complete.

Table 21 Conductivity Values at Temperature for KCl Solution

ACCEPT. Conductivity calibration is complete.

Solution

Tem p ° C

30 1.099 25 1.000 20 0.902

29.8 1.095 24.8 0.996 19.8 0.898

29.6 1.091 24.6 0.992 19.6 0.894

29.4 1.087 24.4 0.988 19.4 0.890

29.2 1.083 24.2 0.984 19.2 0.886

29 1.079 24 0.980 19 0.882

28.8 1.075 23.8 0.976 18.8 0.878

28.6 1.071 23.6 0.972 18.6 0.874

28.4 1.067 23.4 0.968 18.4 0.870

28.2 1.063 23.2 0.965 18.2 0.866

28 1.059 23 0.961 18 0.862

27.8 1.055 22.8 0.957 17.8 0.858

27.6 1.051 22.6 0.953 17.6 0.854

27.4 1.047 22.4 0.949 17.4 0.850

27.2 1.043 22.2 0.945 17.2 0.846

27 1.039 22 0.941 17 0.842

26.8 1.035 21.8 0.937 16.8 0.838

26.6 1.032 21.6 0.933 16.6 0.835

26.4 1.028 21.4 0.929 16.4 0.831

26.2 1.024 21.2 0.925 16.2 0.827

26 1.020 21 0.921 16 0.823

25.8 1.016 20.8 0.917 15.8 0.819

25.6 1.012 20.6 0.913 15.6 0.815

25.4 1.008 20.4 0.909 15.4 0.811

25.2 1.004 20.2 0.905 15.2 0.807

Calibration Value

to be Entered

Solution

Tem p °C

Calibration Value

to be Entered

Solution

Temp °C

Calibration Value

to be Entered

Page 59

Section 8 Communications Setup

Data in the 950 Flow Meter can be transferred to a personal computer (PC) data management software by using a direct cable between the PC and meter, the cellular modem option, standard modem, or the portable Data Transfer Unit (DTU). See

Figure 12.

The Data Transfer Unit (DTU) is a hand-held portable device that allows the user to connect to the flow meter using an RS232 serial cable. Data is transferred from one or more 950 Flow Meters into the DTU. After collecting data from one or more meters, the DTU can transfer the information to a PC running data management software. For detailed information, refer to the Data Transfer Unit Manual (Cat. No. 3516-89).

The 950 Flow Meter can also use Supervisory Control and Data Acquisition (SCADA) Modbus in this section.

communications protocol with the RS232 interface or Modem as described later

Figure 12 Communication Capabilities

8.1 RS232 Setup

8.1.1 RS232 Connections

Note: All interface receptacles are covered with push-on caps. These caps are designed to protect the connector pins from dirt and moisture and should be attached to any receptacle not in use.

The RS232 connector is a serial input/output port for communicating with the flow meter from an external device such as a DTU or direct serial connection to a PC running data management software. This serial interface can also be used for the SCADA-Modbus interface. (See Appendix E on page 109).

This port may be configured to communicate at 1200, 2400, 4800, 9600, or 19200 baud.

Table 22 RS232 Connector Pin Assignments

Pin Signal Description Wire Color

A not used white

Bground blue

Page 60

Communications Setup

Cable Required

RS232 Flow Meter to PC Cable Assembly, 10 ft (3.0 m) long, 6-pin connector on one end, 9-pin D-type connector on the other end (P/N 1727) (9-pin to 25-pin D-type adapter included).

Table 22 RS232 Connector Pin Assignments

Pin Signal Description Wire Color

C DSR yellow

DRCD black

EDTR red

FTXD green

Figure 13 PC to Flow Meter Cable Connection

1 Flow Meter to PC Cable (P/N 1727) 3 RS232 Connector

2 Extension Cable (optional) (P/N. 3358) 4 DB9 Serial COM Port

8.1.2 RS232 Programming

Note: Long runs of RS232 cable, especially if they are run near large motors or fluorescent lights can cause communication errors and may require a slower baud rate.

1. From the Main Menu, select OPTIONS > ADVANCED OPTIONS > COMMUNICATIONS

SETUP > RS232 SETUP

2. Press

CHANGE CHOICE to select a baud rate for data communications; 1200, 2400,

4800, 9600 or 19200 baud.

The higher the baud rate setting, the faster data will transfer. Set the baud rate to the highest setting allowed by the computer. The baud rate must correspond to the baud rate selected in the software. Press

ACCEPT.

Page 61

8.2 Modem

8.2.1 Modem Connection

Use this connection with the optional internal modem (P/N 4578) and a standard dial-up public telephone line. This interface can also be used for the SCADA-Modbus interface. (See Appendix E on page 109).

Connect the telephone line to the meter with the Modem Line Filter Connector (P/N 4459 (2-pin connector)). The RJ11-style phone connector adapter (P/N 3188) can also be provided for modular connection if desired (Figure 14).

Figure 14 RJ11-Style Modular Connector Adaptor (With Cover Removed)

Communications Setup

Table 23 Modem Connection Pin Assignments

Pin Signal Description Wire Color

Atip red

B ring green

C12 V dc N/A

D 12 V dc reference N/A

1 Modem Cable Assembly (P/N 2862) 3 RJ11-Style Adaptor (P/N 3188)

2 Red 4 Green

8.2.2 Modem Programming

1. From the Main Menu, select OPTIONS>ADVANCED OPTION> COMMUNICATIONS

SETUP

2. Highlight Modem Setup using the

11:00 AM 21 - APR - 01 COMUNICATION SETUP

SELECT

RETURN

MODEM SETUP

RS232 SETUP

UP and DOWN soft keys. Press ACCEPT.

Page 62

Communications Setup

3. Enable modem power by pressing the CHANGE CHOICE soft key. Modem power is

turned off when not in use to conserve battery power.

4. Select either pulse or tone dialing modes. This will depend on the type of phone

service selected for the site phone line. Press

11:00 AM 21 - APR - 01 MODEM SETUP

CHANGE

MODEM POWER:

ENABLED

CANCEL

CHOICES: ENABLED, DISABLED

ACCEPT.

11:00 AM 21 - APR - 01 MODEM SETUP

DIAL METHOD:

TONE

CANCEL

CHOICES: TONE, PULSE

CHOICE

CHANGE

CHOICE

5. Enter a phone number using the numeric keypad. This phone number is used by the

8.2.3 Modem Options

8.2.3.1 Pager Option

The 950 Flow Meter can be setup to call up to 3 individual pagers or a remote computer when a given alarm condition has been met. As indicated in the upper right-hand corner of the display menu which follows, the pager setup is an extension of the Modem Setup menus (see above). To have the 950 Flow Meter call a pager, the Pager Option must be enabled.

Pager reporting uses the industry standard Telelocator Alphanumeric Protocol (TAP) to deliver information up to three alphanumeric pagers. The logger dials your paging service provider and passes the alarm code, site ID, and up to three pager phone numbers to the service provider automatically. The pager service then sends the alarm information to all enabled pagers.

modem when it sends an alarm report to a personal computer running Hach’s data management software.

11:00 AM 21 - APR - 01 MODEM SETUP

PHONE NUMBER:

555-5555 CLEAR

CANCEL

(USE NUMERIC KEYPAD)

ENTRY

When contracting with your local pager service provider you must inform them that the 950 Flow Meter conforms to the TAP standard. With this information they will be able to configure their equipment to work with the meter.

Page 63

Communications Setup

1. Press CHANGE CHOICE to enable the Pager Option. Press the ACCEPT.

11:00 AM 21 - APR - 01 MODEM SETUP

CHANGE

PAGER OPTION:

ENABLED

CANCEL

CHOICES: ENABLED, DISABLED

2. Enter the phone number of the paging service. If this number is unknown it can

usually be obtained by contacting the pager service's technical support department. Press

ACCEPT.

11:00 AM 21 - APR - 01 MODEM SETUP

ACCEPT PAGE R SE RV ICE

PHONE NUMBER:

555-5555 CLEAR

CANCEL

(USE NUMERIC KEYPAD)

CHOICE

ENTRY

3. Enter the number of pagers to call when an alarm occurs. The 950 Flow Meter will

support up to 3 pagers. Press

4. Enter the phone numbers of the individual pagers that the message will be sent to.

These numbers are usually provided when the pager is purchased. Press

8.2.3.2 Reporting Devices

ACCEPT.

11:00 AM 21 - APR - 01 MODEM SETUP

NUMBER OF PAGERS:

3 CLEAR

CANCEL

ENTER 1 - 3

11:00 AM 21 - APR - 01 MODEM SETUP

ACCEPT PAGE R #1

PHONE NUMBER:

555-5555

CANCEL

CHOICES: ENABLED, DISABLED

ENTRY

ACCEPT.

CHANGE

CHOICE

You have the choice of which communication devices will report and in what order. Choices are

PAG ER

MODEM ONLY, PAGER ONLY, PAGER THEN MODEM, and MODEM THEN

Page 64

Communications Setup

1. Press CHANGE CHOICE until the desired reporting method is displayed then press

ACCEPT.

2. When the 950 Flow Meter calls the pager service, it will transmit a

Pager Alarm Code number (see Table 24) which corresponds to a specific alarm condition.

Alarm Code # Reason

Low Main Battery 1 Battery pack is less than 11.5 V

Memory Battery 2 Internal memory battery is low

Low Slate Memory 3 Less than 10% slate memory left

Slate Memory Full 4 Slate memory is used up

— 6 Reserved for Sampler

— 7 Reserved for Sampler

— 8 Reserved for Sampler

— 9 Reserved for Sampler

U-Sonic Echo Loss 10 No return signal detected

Xducer Ringing 11 The return signal is detected too soon

U-Sonic failure 12 Ultrasonic board detects an error

RS485 Timed Out 13 Comm. problems with RS485

— 14 Reserved for Sampler

— 15 Reserved for Sampler

Low Bubbler Pres. 16 Possible leak in bubble tank

Clogged Bubbler 17 Bubbler tube is plugged

High Level 18 —

High Flow 19 —

High Flow Rate of Chg. 20 —

High pH/ORP 21 —

High Process Temperature 22 —

High Rainfall 23 —

High CH1 24 —

High CH2 25 —

High CH3 26 —

High CH4 27 —

High CH5 28 —

High CH6 29 —

High CH7 30 —

11:00 AM 21 - APR - 01 MODEM SETUP

CHANGE

ACCEPT REPORTING ORDER:

PAGER THAN MODEM

CANCEL

CHOICES: MODEM AND / OR PAGER

CHOICE

Table 24 Pager Alarm Codes

Page 65

Communications Setup

Table 24 Pager Alarm Codes (continued)

Alarm Code # Reason

Low Main Battery 1 Battery pack is less than 11.5 V

Memory Battery 2 Internal memory battery is low

Low Slate Memory 3 Less than 10% slate memory left

Slate Memory Full 4 Slate memory is used up

— 6 Reserved for Sampler

— 7 Reserved for Sampler

— 8 Reserved for Sampler

— 9 Reserved for Sampler

High Reference Temperature 31 —

High Velocity 32 —

High D.O. 33 —

High D.O. Temp. 34 —

High Conductivity 35 —

High Conductivity Temp. 36 —

Low Level 37 —

Low Flow 38 —

Low pH/ORP 39 —

Low Process Temp. 40 —

Low CH1 41 —

Low CH2 42 —

Low CH3 43 —

Low CH4 44 —

Low CH5 45 —

Low CH6 46 —

Low CH7 47 —

Low Reference Temp. 48 —

Low Velocity 49 —

Low D.O. 50 —

Low D.O. Temp. 51 —

Low Conductivity 52 —

Low Cond. Temp. 53 —

8.2.3.3 Entering the Phone Number of the Remote Computer

If the pager option is disabled, the 950 Flow Meter can be configured to call a remote computer when an alarm condition has been met. Enter the phone number of the remote computer to be called when the alarm condition is met. This same phone number will be used for all other alarms. If the phone number is long distance be sure to enter a “1” and the area code as well. After entering the phone number press

ACCEPT.

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Communications Setup

8.2.3.4 Choosing the Dial Method (Tone or Pulse)

Press the CHANGE CHOICE soft key until the correct dial method (pulse/tone) appears in the center of the display. Press the

11:00 AM 21 - APR - 01 MODEM SETUP

CANCEL

CHOICES: TONE, PULSE

8.3 Analog Communications

Channels 1 through 7 are analog input channels that can accept a signal from an external device. This signal may range from -4 V dc (min.) to +4 V dc (max.) or from 0 to 20 mA dc depending on the input selected. In some cases, input signals from certain devices may also fall somewhere within those ranges. For that reason, each analog input channel must be mapped to the minimum and maximum signal limits of the external device.

8.3.1 4–20 mA Output

ACCEPT soft key to continue.

CHANGE

CHOICE

DIAL METHOD

TONE

8.3.1.1 4–20 mA Connections

Note: Due to the power demand of current loops, this option requires that an ac power supply be installed on the flow meter. Battery power is not sufficient to support the 4–20 mA current loop power requirements.

The 4–20 mA option is available as one or two current-loop interfaces for controlling external devices such as a chlorinator or a chart recorder. Either one or both of the 4–20 mA outputs can be factory installed and are isolated from each other.

Isolation Voltage Rating

Note: 950 flow meters are available with one or two 4–20 mA outputs. Both outputs are installed in one receptacle.

• Between flow meter and either 4–20 mA output: 2500 V ac

• Between the two 4–20 mA outputs: 1500 V ac

• Maximum Resistive Load: 600 ohms

• Output Voltage: 24 V dc, no load

Table 25 4–20 mA Connector Pin Assignments

Pin Signal Description Wire Color

A output A + (pos) yellow

B output A - (neg) black

C output B + (pos) red

D output B - (neg) green

Cable Required:

4–20 mA Output Cable Assembly, 25 ft (7.6 m), 4-pin connector on one end, tinned wire leads on the other end (P/N 2924).

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8.3.1.2 Programming the 4–20 mA Output

The dual isolated 4–20 mA current loop outputs on the 950 Flow Meter are unique, they can be assigned to any of the available channels, not just flow. In addition, the 4 mA and 20 mA current levels are programmed to any desired minimum and maximum value for that channel.

Communications Setup

1. From the Main Menu, select

SELECT

OPTIONS > ADVANCED OPTIONS > 4–20 mA OUTPUTS >

2. When the 4–20 mA outputs are disabled and the 950 is not completely turned off,

they will continue to output a steady 4 mA.

3. Press

4. Choose

CHANGE CHOICE to enable the 4–20 mA outputs. Press ACCEPT.

OUTPUT A or OUTPUT B and press SELECT.

11:00 AM 21 - APR - 01 4–20 mA OUTPUTS

SELECT

RETURN

OUTPUT A

OUTPUT B

5. Select an Input Channel (channel 1, 2, 3, flow, etc.) to assign to that output. Press

CHANGE CHOICE to cycle through the channel names. When the desired channel is

displayed, press

11:00 AM 21 - APR - 01 4–20 mA OUTPUTS

ACCEPT.

CANCEL

CHANGE

CHOICE

INPUT CHANNEL:

FLOW

SELECT APPROPRIATE UNITS

6. Assign a channel value to the 4 mA current value. This value is typically 0, however

any value can be set. In other words, enter the value of the input needed to generate 4 mA of current at the output.

11:00 AM 21 - APR - 01 4–20 mA OUTPUTS

CLEAR ENTRY

7. Assign an input value to the 20 mA current level.

8. Repeat this process to configure the other 4–20 mA output.

8.3.1.3 Calibrating the 4–20 mA Output

After wiring the 4–20 mA connection, perform a 4–20 mA output calibration. The 4–20 mA output calibration requires a multimeter and an interface or access to the 4–20 mA current loop wiring. Two 4–20 mA outputs are available and are designated Output A and Output B. Both outputs are calibrated the same way and are isolated from each other.

4 mA INPUT VALUE

0.00 mgd CANCEL

SELECT APPROPRIATE UNITS

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Communications Setup

Calibration may be performed while the 4–20 mA device is in the current loop, as shown in Figure 15 or disconnected from the current loop as shown in Figure 16. In either case, the multimeter must be set to a 20 milliamp dc range or greater.

1. From the Main Menu, select

mA OUTPUTS.

OPTIONS > ADVANCED OPTIONS > CALIBRATION > 4–20

2. Connect a multimeter to the 4–20 mA current outputs per Figure 15 or Figure 16.

3. Make sure that the 4–20 mA output is enabled. If it is not enabled, press

CHOICE

so that the display shows Enabled and press ACCEPT.

CHANGE

4. Select the output (A or B) to calibrate.

5. Press any key to set the selected output to 4.00 mA dc.

6. Measure the current on the selected output using the multimeter and enter the

measured value using the numeric keypad. Press

ACCEPT.

7. Press any key to set the output to 20.00 mA dc.

8. Measure the current on the selected output using the multimeter and enter the

measured value using the numeric keypad. Press

ACCEPT to complete the

calibration.

By entering the measured current values, the microprocessor will electronically adjust the outputs to compensate for the difference between the measured values and the expected values.

Figure 15 Calibration with the Meter in the Loop

Figure 16 Calibration with the 4–20 mA Device Disconnected from the Loop

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8.3.2 Analog Inputs

8.3.2.1 Analog Voltage Inputs

Note: Note: 4–20 mA inputs must be isolated. Maximum load per input is 200 ohms.

There are a total of seven analog input channels available on the 950 Flow Meter. These inputs accept 0–20 mA dc or -4 to +4 V dc analog signals. They can be logged and graphed in the same manner as the five dedicated channels (level, flow, rainfall, etc.) and can also be used to trigger alarms, cause set point samples, and control 0–20 mA outputs.

Communications Setup

Table 26 Analog Input Pin Assignments

Pin Signal Description Description Wire Color

A 12 V dc

B ground

C input 1 (0–20 mA dc)

D input 2 (0–20 mA dc) black

E input 3 (0–20 mA dc) red

F input 4 (-4 to +4 V dc)

G input 5 (-4 to +4 V dc) gray

H input 6 (-4 to +4 V dc) brown

J input 7 (-4 to +4 V dc) purple

K not used N/A orange

If the DO/Conductivity options was purchased, only three additional inputs are available (Pins C, D, and E).

Provides a source of +12 V dc which may be

used to power external analog devices

Used in conjunction with any or all the input

signals on Pins C–J.

0–20 mA dc inputs for Channels 1 through 3.

-4 to +4 V dc inputs for Channels 4-7

yellow

Cable Required

Analog Input Cable Assembly, 25 ft (7.6 m), 10-pin connector on one end, tinned wire leads on the other end (P/N 2706).

white

blue

green

8.3.2.2 Analog Voltage Inputs Programming

To map an external device to an analog input channel:

Select an analog input channel (1, 2, and 3 are current inputs and 4 through 7 are voltage inputs).

1. Select

2. Highlight

Note: A channel with logging enabled will have an arrow in front of it to signify that the channel is logged.

3. Highlight the analog channel to log using the UP and DOWN keys, then press

SELECT.

4. Press

ACCEPT.

5. Enter a Logging Interval.

DATA LOG from the Advanced Options menu.

SELECT INPUTS using the UP and DOWN keys. Press SELECT.

CHANGE CHOICE to cycle between “Logged” and “Not Logged”, then press

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Communications Setup

6. Select Unit of measurement (ppm, ppb, afd, cfs, cfm, cfd, cms, cmm, cmh, cmd, gps,

gpm, gph, lps, lpm, lph, or mgd).

7. Enter Low Point.

8. Apply minimum current output (4 mA) from other instrument.

9. Enter High Point.

10. Apply maximum current output (20 mA) from the other instrument.

11. Select another channel to configure, or press

MAIN MENU function key to return to the Main Menu.

RETURN to back up one step. Press the

Example: A dissolved oxygen meter has an analog output signal that will connect to the

950 Flow Meter analog input channel 4. The DO meter puts out an analog signal which ranges from +1 V dc to +3 V dc, which is equivalent to 0 to 500 ppm. The DO meter is connected to Channel 1 and log readings from the DO meter occur once per minute.

To configure data logging for this example, follow the steps below.

1. Select

2. Highlight

3. Highlight the analog channel to log (Channel 4) using the

then press

4. Press

DATA LOG from the Advanced Options menu.

SELECT INPUTS using the UP and DOWN soft keys and then press SELECT.

UP and DOWN soft keys,

SELECT.

CHANGE CHOICE to select “Logged,” then press ACCEPT.

5. Enter a 1-minute logging interval using the numeric keypad, then

press

ACCEPT.

6. Press

CHANGE CHOICE to cycle through the units of measure until ppm is displayed.

Press

ACCEPT.

7. Apply a voltage to the desired analog input which corresponds to 0 ppm (or +1 V dc).

Enter 0 ppm using the numeric keypad and press

ACCEPT.

8. Apply a voltage to the same analog input that corresponds to 500 ppm or +3 V dc.

Enter 500 ppm using the numeric keypad and then press

ACCEPT to complete the

analog channel setup.

8.4 Alarm Relays

8.4.1 Alarm Relay Connections

Note: One cable is required for each set of two installed relays.

Up to four optional alarm relay outputs are available as factory installed options. Two relays can be added at a time and each set of two relays share a single interface connector.

Table 27 Relay 1 & 2 Connector Pin Assignments

Pin Signal Description Wire Color

A relay #1 N.O. (normally open) green

B relay #1 common black

C relay #1 N.C. (normally closed) white

D relay #2 N.O. (normally open) green

E relay #2 common black

F relay #2 N.C. (normally closed) white

Page 71

Pin Signal Description Wire Color

C relay #3 N.C. (normally closed) white

D relay #4 N.O. (normally open) green

Rating

Form C relays are rated for 10 amps at 120 V ac or 5 amps at 240 V ac resistive load min. Normally open and normally closed contacts are available.

Cable Required

Alarm Relay Cable Assembly, 25 ft (7.6 m), 6-pin connector on one end, tinned wire leads on the other end (P/N 2705).

8.4.2 Alarm Relays Programming

Alarms can be programmed to activate based on certain conditions (low battery, low memory, etc.). Refer to 950 Flow Meter Advanced Options on page 87. When an alarm is tripped, an action is initiated (report via modem, dial a pager, or set a relay). Two types of alarms are trouble and set point alarms.

Communications Setup

Table 28 Relay 3 & 4 Connector Pin Assignments

A relay #3 N.O. (normally open) green

B relay #3 common black

E relay #4 common black

F relay #4 N.C. (normally closed) white

8.4.2.1 Trouble Alarms

Trouble Alarms initiate an action when a trouble condition occurs. For example, a relay may close when the memory is full.

1. From the Main Menu, select

2. Enable one of the trouble conditions.

3. Select an action to occur when the alarm is activated. Table 29 shows each Trouble

Condition and its cause.

Table 29 Trouble Alarms

Trouble Condition Cause

Low Memory Battery Internal memory battery voltage is too low. Change batteries.

Low Slate Memory Free slate memory is less than 20%

Low Bubbler Pressure

Clogged Bubbler Bubbler line obstructed or submerged below ten feet.

U-Sonic Echo Loss (A pulse of sound was sent but no echo was received back)

Transducer Ringing Transducer is operating within the deadband.

U-Sonic Failure Transducer not plugged in. Cable damaged. Transducer thermal sensor damaged.

RS485 Timed Out

Bubbler system not developing sufficient air pressure. (Inspect air pump, reservoir, and associated tubing assemblies for problem.)

The echo has been temporarily deflected by a change in site conditions such as floating debris or foam in the channel, wind, etc.

Problem with communications between the flow meter and a remote ultrasonic sensor. May indicate open thermal sensor.

SETUP > ADVANCED OPTIONS > ALARMS.

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Communications Setup

8.4.2.2 Set Point Alarms

Set Point Alarms activate when a user-definable high and/or low set point is reached. Set Point Alarms look for trip points to be reached before initiating an action.

Note: The rate of change alarm can be used with any primary device except when the primary device is defined as area-velocity.

4. Enable one of the alarm conditions (level, flow rate of change, rainfall,

DO/Conductivity, Flow, pH, or Analog Channels 1–7).

5. Select an action to occur when the alarm is activated.

6. Set either a High trip point or a Low trip point.

Table 29 Trouble Alarms (continued)

Alarm Action(s):

Set Relay #1

Set Relay #2

Set Relay #3

Set Relay #4

Report via Modem

7. Enter the deadband value. The deadband is the area between the alarm “turn on”

and “turn off”. Refer to Setting the Deadband on page 90.

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Section 9 Maintenance

DANGER Some of the following manual sections contain information in the form of warnings, cautions and notes that require special attention. Read and follow these instructions carefully to avoid personal injury and damage to the instrument. Only personnel qualified to do so, should conduct the maintenance tasks described in this portion of the manual.

DANGER Certains des chapitres suivants de ce mode d’emploi contiennent des informations sous la forme d’avertissements, messages de prudence et notes qui demandent une attention particulière. Lire et suivre ces instructions attentivement pour éviter les risques de blessures des personnes et de détérioration de l’appareil. Les tâches d’entretien décrites dans cette partie du mode d’emploi doivent être seulement effectuées par le personnel qualifié pour le faire.

PELIGRO Algunos de los capítulos del manual que presentamos contienen información muy importante en forma de alertas, notas y precauciones a tomar. Lea y siga cuidadosamente estas instrucciones a fin de evitar accidentes personales y daños al instrumento. Las tareas de mantenimiento descritas en la presente sección deberán ser efectuadas únicamente por personas debidamente cualificadas.

GEFAHR Einige der folgenden Abschnitte dieses Handbuchs enthalten Informationen in Form von Warnungen, Vorsichtsmaßnahmen oder Anmerkungen, die besonders beachtet werden müssen. Lesen und befolgen Sie diese Instruktionen aufmerksam, um Verletzungen von Personen oder Schäden am Gerät zu vermeiden. In diesem Abschnitt beschriebene Wartungsaufgaben dürfen nur von qualifiziertem Personal durchgeführt werden.

PERICOLO Alcune parti di questo manuale contengono informazioni sotto forma d’avvertimenti, di precauzioni e di osservazioni le quali richiedono una particolare attenzione. La preghiamo di leggere attentivamente e di rispettare quelle istruzioni per evitare ogni ferita corporale e danneggiamento della macchina. Solo gli operatori qualificati per l’uso di questa macchina sono autorizzati ad effettuare le operazioni d’istallazione e di manutenzione descritte in questa parte del manuale.

This chapter explains how to maintain, repair, and upgrade the Sigma 950 Flow Meter. It describes how to open the case, inspect and replace fuses, replace desiccant, and perform operating system software upgrades.

9.1 Routine Maintenance

Routine maintenance of the 950 Flow Meter consists of calibrating input channels and cleaning the case.

9.1.1 Calibration

Calibration should be performed on all channels at the proper interval for that type of input.

9.1.2 Cleaning the Case

Clean the outside of the case with a damp cloth and mild detergent. Use a non-abrasive plastic cleanser on the front cover if necessary. Avoid harsh chemicals or solvents because they may harm the case or fog the front cover.

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Maintenance

9.1.3 Maintaining Desiccant Cartridges and Desiccant

The desiccant cartridges are located on the right side of the case on bubbler units and are connected to the reference and intake ports. They keep the air that is used by the bubbler system dry. The desiccant material in the tubes remove moisture from the air. Eventually the desiccant becomes saturated and needs to be replaced. The desiccant material contains tiny blue beads that will turn pink when saturated. When the beads turn pink, either replace the dryer tubes (P/N 5027), replace the desiccant (P/N 3624), and membrane (P/N 3390) or rejuvenate the desiccant as described in section 9.1.3.2.

Moisture in the reference port and intake lines can damage the mechanical components of the bubbler system. Maintaining the desiccant in both dryer tubes will greatly prolong the life of the bubbler system in the 950 Flow Meter.

9.1.3.1 Replacing the Desiccant

1. Remove the desiccant cartridges by pulling them out of their clips.

2. Remove the end caps and dump out the old desiccant.

3. Replace the white hydrophobic filter membrane (P/N 3390) in each end cap. The dull

side of the membrane must face into the incoming air flow.

4. Pour new desiccant into the tubes and replace the end caps.

5. Snap both dryer tubes back into their clips.

9.1.3.2 Rejuvenating the Desiccant

Remove the beads from the cartridge and heat in an oven at 100 to 180 °C (212 to 350 °F), until the beads turn blue again. If the beads do not turn blue, replace them with new desiccant.

9.1.3.3 Maintaining the Hydrophobic Membrane

When checking or changing the desiccant in the external desiccant cartridge, check the white hydrophobic filter membrane in the ends of the desiccant cartridges and replace as necessary. These membranes keep liquid out of the cartridge while still allowing air into the cartridge. If the membrane becomes plugged, the flow meter will not read accurately and may display error messages. Each cartridge contains one membrane. The membrane is located in the threaded fitting at the top of the cartridge. If these membranes are any other color then white, replace the membrane.

9.2 Upgrades, Repairs, General Maintenance

Only a qualified technician should service the 950 Flow Meter. For example, steps that require knowledge of CMOS electrostatic discharge precautions and advanced electronics training and should only be performed by a qualified technician. If you need assistance in performing any of the following service steps, please contact the manufacturer.

Electrostatic Discharge (ESD) Considerations

To minimize hazards and ESD risks, maintenance procedures not requiring power to the analyzer should be performed with power removed.

Delicate internal electronic components can be damaged by static electricity, resulting in degraded instrument performance or eventual failure.

The manufacturer recommends taking the following steps to prevent ESD damage to your instrument:

• Before touching any instrument electronic components (such as printed circuit cards

and the components on them) discharge static electricity from your body. This can be

Page 75

accomplished by touching an earth-grounded metal surface such as the chassis of an instrument, or a metal conduit or pipe.

• To reduce static build-up, avoid excessive movement. Transport static-sensitive

components in anti-static containers or packaging.

• To discharge static electricity from your body and keep it discharged, wear a wrist

strap connected by a wire to earth ground.

Handle all static-sensitive components in a static-safe area. If possible, use anti-static floor pads and work bench pads.

9.2.1 Internal Maintenance Items

The following items require access to the inside of the case for service:

• Fuses for the 12 V dc input, as well as the RS485 and sampler and analog interface

connectors (if so equipped)

• Internal desiccant module

• RAM memory batteries

• Bubbler Module

• System upgrades or enhancements (4–20 mA, modem, alarm relays, etc.)

Maintenance

• Circuit board repair

9.2.2 Removing the Front Panel

Always disconnect the power cable and all other cables from the 950 Flow Meter before removing the front panel.

1. Disconnect and remove the power supply and all cables.

2. Remove the 18 screws from around the perimeter of the case.

3. Carefully pull open the front panel in the same direction as you would to open the

front cover. Be sure to let the attached connectors (J4 and J6) swing out of the way (see Figure 17).

Note: The front panel gasket has a light coating of grease to help assure a water tight seal. Do not to contaminate the grease or gasket area during servicing. Always replace the gasket if it is damaged or missing. Never reassemble the case without the gasket properly installed.

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Maintenance

Figure 17 950 Flow Meter Inside View

1 Base Board 3 LCD Board 5 CPU Board 7 Opening the Front Cover

2 J4 Connector 4 J6 Connector 6 Memory Batteries

9.2.3 Re-Installing the Front Panel

Always follow the procedure below when re-installing the front panel. Improper front panel installation may result in damage to the instrument.

1. Hand tighten the screws in the sequence shown in Figure 18 on page 75 until the

head of each screw makes contact with the front panel.

2. Tighten screws in sequence shown in Figure 18 on page 75 to 5 in.-lb

(0.565 Newton-meter).

3. Repeat the tightening procedure in the same sequence to 10 in.-lb

(1.125 Newton-meters).

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Figure 18 Screw-Tightening Sequence

Maintenance

9.3 Circuit Board Identification

Note: Removal and handling of the circuit boards used in the 950 Flow Meter requires knowledge of ESD (Electrostatic Discharge) precautions and the CMOS circuit components used in the meter. Static electricity can damage the CMOS components of the meter when the boards are unplugged and removed from the case. Precautions must be taken to assure a static-free work area prior to handling the circuit boards.

The 950 Flow Meter contains two main circuit boards: the Base Board and the CPU Board. The CPU board is located on the front panel assembly and the Base Board is located inside the back section of the case.

In addition, a liquid crystal display (LCD) circuit board is located behind the CPU board. The LCD board is an integral part of the LCD screen and contains no user serviceable components (see Figure 17).

9.4 Fuse and Connector Locations

Four fuses are provided to protect the 950 Flow Meter electronics from damage due to short circuits or excessive current draw. Three fuses are located on the Base Board (Figure 19) and one fuse is located on the CPU Board (Figure 20). Table 30 through

Table 33 list the functions associated with the connectors and the fuses and their ratings

for both circuit boards.

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Maintenance

J6 J2 J11

F2 (4 Amp)

F3 (1 Amp)

J8 J9 J10

F1 (4 Amp)

Figure 19 Base Board

Table 30 Base Board Fuses

ID Description Type & Rating

+12 V dc Interface Connector Main power input to meter

Pin A (ground), Pin B (+12 V dc)

+12 V dc Sampler interface connector Pin A (+12 V dc),

Pin B (ground)

Analog Input Option Interface connector (if so equipped)

Pin A (+12 V dc), Pin B (ground)

4 Amp, 125 V ac Slow-blow 5 x 20 mm (P/N 2604)

1 Amp, 250 V ac Fast-blow 5 x 20 mm (P/N 2536)

Table 31 Base Board Connectors

ID Description

J1 +12 V dc - Main Power Input

J2 Relay Option

J3 CPU Circuit Board

J4 4–20 mA Output Option

J5 Display push-button

J6 Rain Gauge Option

J7 Bubbler Assembly

J8 pH/ORP Option

J9 Submerged Pressure Sensor

J10 Analog Input Option

J11 Sampler Interface Connector

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Figure 20 CPU Board

J10

J11

Maintenance

Table 32 CPU Board Fuse

ID Description Type & Rating

F1 RS485 Interface Connector 2 Amp, 250 V ac Fast-blow, 5 x 20 mm (P/N 2605)

Table 33 CPU Board Connectors

ID Description

J1 Liquid Crystal Display (LCD) Board

J2 Mechanical Totalizer

J3 not used

J4 Base Board

J5 Memory Backup Battery Pack

J6 RS232 Serial Port

J7 RS-485 - Submerged Pressure Probe - (not used on bubbler 950)

J8 Modem Option Module

J9 Liquid Crystal Display (LED back-light)

J10 Keypad

J11 not used

9.4.1 Fuse Removal and Inspection

To remove a fuse, pull it straight out of the clips that hold it in place. Usually a close look will tell you if a fuse is blown. The wire strand inside the glass tube will be broken. Occasionally it may take an ohmmeter to verify if a fuse is good or not. You may need to remove plug J1 to access fuse F1.

Always replace any fuse with the exact same size and type rating. Over-rating or bypassing a fuse could lead to severely damaged equipment.

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Maintenance

9.4.2 Working with Wiring Connectors

All inter-connect wiring plugs and receptacles are mechanically polarized to assist in proper insertion. Always note where a connector belongs and what orientation it was in prior to removal. This will assure that you get it back in the right place during reassembly.

Locations and descriptions of each fuse and connector on the Base Board and CPU board are shown in Figure 19 and Figure 20.

9.5 Replacing the Internal Desiccant Module

The Internal Desiccant Module (P/N 787) consists of a moisture absorbing material inside a poly bag. The module should be replaced if the Internal Case Humidity Indicator on the front panel turns pink.

To replace the desiccant module, proceed as follows:

1. Remove the screw holding the desiccant door in place and remove the door

(Figure 21).

2. Slide out the old desiccant module and slide in a fresh one

3. Reattach the desiccant door.

The desiccant module cannot be recharged by heating. Do not attempt to bake the desiccant module in an oven to remove the moisture because this could be a fire hazard.

Figure 21 Replacing Internal Desiccant Module

1 Internal Module (P/N 787) 2 Remove desiccant access screw and door.

9.6 Replacing the Internal Case-Humidity Indicator Disc

After replacing the desiccant module and re-sealing the case, the Internal Case Humidity Indicator Disc (P/N 2660) will return to its original blue color within 24 hours.

If the indicator disc fails to return to blue after replacing the desiccant module, replace the disc. The indicator disc is held in place by a small clip and screw. To gain access to the indicator disc you must first remove the CPU board. Be sure to observe proper handling for static sensitive CMOS devices.

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9.7 Memory Batteries

Random Access Memory (RAM) is a very reliable data storage medium for microprocessor applications however, a RAM requires power at all times to store its data. If power is removed, the data stored in the RAM chip is lost. Therefore, it is not feasible to power the RAM chips from the meter power supply because you would lose your data and program settings every time you unplugged the power cord. A separate battery pack located inside the flow meter powers the RAM chips and the real time clock.

The memory batteries (P/N 2709) keep the program entries and logged data stored in RAM memory when the main power fails or is removed for transport or replacement.

The memory batteries consist of two 1.5 V dc C cells. They are located below and behind the CPU circuit board, which is attached to the inside of the front panel assembly. They are easily replaced without having to remove the CPU board assembly. Use only good quality alkaline C cells as replacements.

If the memory battery voltage falls too low to properly maintain the program settings, a warning: “MEMORY BATTERY” will flash in the lower right corner of the display to alert you to replace the batteries. The meter uses a very small amount of energy from the memory batteries during normal operation.

To replace the memory batteries, refer to Figure 17 and proceed as follows:

1. Download all data before removing the batteries. All data will be lost from the meter

when the batteries are removed.

2. Pull back on and open the Velcro

retaining strap.

Maintenance

3. Remove the old batteries and insert the new ones.

4. Refasten the Velcro retaining strap.

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Maintenance

Page 83

Appendix A Program Flow Charts

Figure 22 Overview of Basic Program Menus

Page 84

Program Flow Charts

Figure 23 Setup Flow Chart

Page 85

Figure 24 Options Flow Chart

Program Flow Charts

Page 86

Program Flow Charts

Figure 25 Alarms Menus Flow Chart

Page 87

Figure 26 Calibration Menus Flow Chart (Page 1)

Program Flow Charts

Page 88

Program Flow Charts

Page 89

Appendix B Programming Features

B.1 Review All Items

To view programmed entries without changing any of the information, select the Review All Items from the Setup menu. Use the arrow keys to scroll through the setup information. Press the

11:00 AM 21 - APR - 01 STATUS SCREEN

REVISION: 1.00

FLUME TYPE: PALMER BOWLUS FLUME

FLUME SIZE: 12 in.

SAMPLER PACING: FLOW UNITS: LEVEL:

11:00 AM 21 - APR - 01 STATUS SCREEN

CHANNEL 3 ppm NOT LOGGED 1 min

CHANNEL 4 ppm NOT LOGGED 1 min

CHANNEL 5 ppm NOT LOGGED 1 min

CHANNEL 6 CHANNEL 7

MEMORY MODE WRAP

MAIN MENU key to exit.

ppm ppm

NOT LOGGED NOT LOGGED

mgd gal in.

1 min 1 min

B.2 Displaying Data

The Display Data function provides the recorded data for any channel being logged in a tabular report or a graph.

In addition, for tabular reports, the data can be viewed from the beginning, from the end, or from a specific point in time. A graph can display any 24-hour period, zoom in to any portion of the 24-hour period for finer detail, or center the graph on a specific point in time.

B.3 Selecting the Channel

Note: Only the channels for which logging has been enabled will be listed.

1. Press DISPLAY DATA from the Main Menu to display a list of logged channels.

2. Highlight the desired channel using the

SELECT.

UP and DOWN arrow soft keys then press

11:00 AM 21 - APR - 01 DISPLAY DATA

SELECT

RETURN

FLOW

RAINFALL

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Programming Features

B.4 Tabular or Graph Format

1. Highlight the desired display method using the UP and DOWN soft keys, then press

SELECT.

11:00 AM 21 - APR - 01 DISPLAY DATA

Function Description

Display Data by Table

View from start: Displays the data for the selected channel beginning with the first (oldest) data point in memory.

View from end: Displays the data for the selected channel beginning from the most recent point in memory.

View from time/date: Displays the data for the selected channel beginning from any desired time and date.

Enters a new desired time and date.

Note: Note: Totals displayed are calculated by summing the logged data. If the date selected precedes available logged data (memory has wrapped), the total will be incorrect.

Display Data by Graph

Graph day: Displays data for a specified date. Data for the selected date is graphed from midnight to midnight.

Graph point in time: Displays data for a specified time and date. The graph displays three hours of data with the

selected point in the time at the corner of the graph.

Graph partial day: Zooms in on a portion of the logged data.

SELECT

RETURN

DISPLAY DATA

DISPLAY BY GRAPH

Table 34 Display Data Functions and Descriptions

Table 35 Graphing Functions and Descriptions

Functions Description

Status Bar

Displays the time, date, measured value, and unit of measure at the intersection of the data cursor. Placing the cursor’s data on the status bar eliminates the need for X or Y axis labels and provides a larger viewing area.

Moving the Data Cursor with the Arrow Keys

The data cursor appears as a vertical line in the center of the graph. Move the data cursor to the left or right by using the soft keys or the numeric keypad.

Moving the Data Cursor with the Numeric Keypad

The keys 0–9 represent a percentage of full scale. Pressing a numeric key on the keypad while a graph is displayed causes the data cursor to jump to the location on the graph that is represented by that key.

For example, pressing the 0 key moves the data cursor to the far left end or 0% position on the graph. Pressing the 5 key moves the data cursor to the middle or 50% position of the graph. Pressing the 9 key moves the cursor to the 90% position.

Next Channel Soft Key

Graphs data from the next logged channel. For example, if the 950 is logging Level, Flow, and pH and the Level graph is currently displayed, the Channel again will create a graph for pH channel. Pressing selects a time period of interest and compares different graphs.

NEXT CHANNEL soft key causes the Flow channel to be graphed. Pressing Next

NEXT CHANNEL again returns to the Level graph,

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B.5 Graphic Display Averaging

The Sigma 950 Flow Meter can display a graph that consists of a maximum of 180 individual dots. Since a 24-hour period could contain as many as 1,440 data points (assuming a one-minute recording interval, one reading each minute) it would be impossible to plot every data point on the graph.

When more than three hours (more than 180 minutes worth) of data is graphed the data points must be averaged. When graphing a partial day of three hours or less, all data points are graphed with no averaging.

When viewing a graph with more than 180 data points, zoom in to the area of interest (using the Graph Partial Day option) so all of the individual data points are displayed.

B.6 Options Features

11:00 AM 21 - APR - 01 OPTION MENU

TIME / DATE

ADVANCED OPTIONS

READY TO START

The Options menu can set the:

Programming Features

SETUP

• Time and Date for the real time clock in the Sigma 950 Flow Meter.

• Program the advanced features of the flow meter.

• Select level sensor when multiple sensors are installed.

B.7 Setting the Time and Date

From the Main Menu, select OPTIONS > TIME/DATE.

11:00 AM 21 - APR - 01 TIME / DATE

_ _: _ _ AM _ _ -APR- _ _

CLEAR ENTRY

USE +/- KEY TO CHANGE 12/24 HR FORMAT

Starting with the hours and minutes, use the numeric keypad to enter numbers in the flashing cursor. Use the soft keys on the right of the display to toggle the AM/PM and month fields to the desired selection. Press to save the changes.

CLEAR ENTRY to clear all numeric fields. When complete, press ACCEPT

+/- keys to toggle between 12-hour and 24-hour formats. Use the

MODE: 12-HR FORMAT

CHANGE AM / PM

CHANGE

MONTH

B.8 Purge Line (Applies to Bubbler Depth Only and Bubbler Area/Velocity

Modes Only)

Note: The Sigma 950 Flow Meter can be programmed to automatically purge at a present interval. For more details, see Depth Only and Bubbler Area/Velocity Calibration on page 46.

From the Main Menu, select OPTIONS>PURGE LINE.

This function will cause a solenoid valve to open for approximately one second, temporarily connecting the bubbler line to the full reservoir air pressure. This causes a high pressure air purge of the bubbler line to blow out any silt or debris that may clog the line and impede the normal flow of air.

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Programming Features

B.9 Advanced Options

2. From the Main Menu, select OPTIONS > ADVANCED OPTIONS.

3. Use the up and down arrow soft keys to highlight the choice, then press the SELECT

soft key to pick that item.

4. Proceed through the series of screens to configure the parameters for the selected

item.

Advanced Options include the following:

• 4–20 mA Outputs (section 8.3.1 on page 64)

• Alarms (section 8.4 on page 68)

• Calibration

• Flow Totalizer (Flow Totalizer on page 95)

• Diagnostics (Diagnostics on page 93)

• Data Log (Data Log on page 91)

• Storm Water (Stormwater on page 98)

B.10 Alarms

• Set Point Sampling (Set Point Sampling on page 97)

• Languages (English, Czech, Danish, French, German, Italian,

Portuguese, Swedish, Dutch, and Spanish. (The 950 supports English and one other selected language).

Setting the Deadband

After entering the trip point, enter a “deadband” value. The deadband is the area between alarm “turn on” and “turn off.”

Note: Rainfall and Flow Rate of Change alarms are High Set Point conditions; they take no deadband, and they are time dependent.

The purpose of setting a deadband is to eliminate alarm relay chatter which may occur if the turn-on and turn-off values are too close together. Small fluctuations that occur when the reading is at or near the trip point can toggle an alarm relay on and off very rapidly.

Note: ou must log rainfall to use an alarm on a rainfall condition; likewise, you must log flow in order to implement an alarm on a flow rate of change. If you forget, you are reminded when the program begins.

In the pH example (Figure 27), the deadband is set to 0.10 pH. When the pH reached 6.9 (lower dashed line), the alarm tripped, but the alarm did not turn off until the pH came back up to 7.00. This difference is the deadband setting which should be set to the characteristics of each measured item.

Four alarm relays are provided with SPDT (Form C) contacts. The normally open, normally closed, and common contacts are on the terminal wiring board.

Multiple alarms can be enabled one at a time. Multiple alarms can be assigned to individual trouble conditions, to individual relays, or assigned to all the same relay.

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B.11 Data Log

7.60

7.40

7.20

7.00

6.80

6.60

6.40

Alarm Off

Alarm On

Deadband

Low Alarm Setpoint= 6.9 pH

Programming Features

Figure 27 Deadband Concept

From the Main Menu, select SETUP > ADVANCED OPTIONS > DATA LOG.

The Sigma 950 Flow Meter can record up to 115,630 readings from any or all input channels and store them in solid state, battery-backed memory for later viewing or retrieval.

This option selects logged input channels, the frequency of logged channels (Logging Interval), and explains what to do when the memory becomes full.

B.12 Logging Intervals

Logging Intervals are designed to optimize the available memory so that readings can be logged for a longer period of time. A Logging Interval is the time period over which readings are taken and then averaged.

The Sigma 950 Flow Meter has three data logging modes; extended power mode, power save mode, and continuous mode:

Extended Power Mode

When operating in extended power mode, the microprocessor spends most of its time asleep, conserving battery power. Once per logging interval, the flow meter wakes up, logs the readings from all enabled input channels, performs any other necessary duties required, and then goes back to sleep. This mode will give the longest battery life but the least resolution.

If you select one-minute logging interval in extended power mode, a reading will be taken once per minute, at which time a reading is logged.

If you select a five-minute logging interval, a reading will be taken once every five minutes, at which time that reading is logged.

Note: The Sigma 950 Flow Meter will assume it is battery operated if it measures less than 14.2 volts and dc powered in its power supply.

Power Save Mode

Power save mode is automatically initiated upon power up if a battery is installed on the flow meter. When operating in power save mode, the microprocessor spends most of its time asleep conserving battery power. Once per minute the flow meter wakes up, logs the readings from all enabled input channels, performs any other necessary duties, and goes back to sleep. This mode will give a quicker battery consumption but better resolution with longer logging intervals.

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Programming Features

If a one-minute logging interval is selected in power save mode, a reading will be taken once per minute, at which time that reading is logged.

If a five-minute logging interval is selected, readings are taken every minute but the data is not logged until the five minute logging interval ends. At the time the readings are averaged over the previous five minutes; that average is logged.

Note: The Review All Items selection from the Setup menu indicates the maximum available logging hours for the channels and recording intervals you selected. The flow meter calculates this information when the program is run using the

Continuous Mode

When a one-minute logging interval is selected, a reading will be taken approximately every second but data is not logged until the logging interval ends. At that time, the readings are averaged over the logging interval; that average is logged.

When a five-minute logging interval is selected, readings are still taken every second but the data is not logged until the five-minute logging interval ends. At that time, the readings are averaged over the previous five minutes; that average is logged.

Longer logging intervals result in a longer total recording time. Lower resolution also occurs since more averaging is done at higher logging intervals. Choose the shortest logging interval possible, while still making data collection convenient. Pick a logging interval that almost fills memory over the course of one month if data will be collected monthly.

RUN/STOP key.

Table 36 Logging Intervals vs. Total Recording Time for Each Memory Configuration

Logging Interval

11280

2 24 160

3 36 240

5 60 401

6 72 481

10 120 803

12 144 963

15 180 1204

20 240 1606

30 360 2409

60 720 4818

Assuming one logged channel.

With 128K Bytes of RAM

(Standard)

(approx. 17,280 readings)

Total recording time (days) before memory is full

With 512K Bytes of RAM

(approx. 115,630 readings)

(Optional)

B.13 Data Logging Memory Allocation Options

The Sigma 950 Flow Meter uses a management scheme called “Dynamic Memory Allocation.” All readings are logged in battery-backed Random Access Memory (RAM). RAM memory is allocated to each channel dynamically during operation. If one channel is logging at 5-minute intervals and a second channel is logging at 1-minute intervals, the meter automatically configures memory so that both channels fill memory at the same time. Five times as much memory is assigned to the channel that is logging at 1-minute intervals than the channel that is logging at 5-minute intervals.

Page 95

Programming Features

Memory can be configured in slate or wrap mode.

Note: When slate memory mode is used and becomes full, the 950 will enter program complete mode and stop logging data.

Slate Memory Mode—Slate mode causes logging to stop when memory becomes full. The flow meter continues to operate but no more data is logged. Use this mode so no data is lost from the beginning of the logging period.

Wrap Memory Mode—In wrap mode, when memory becomes full, the oldest reading is discarded each time a new reading is taken. When memory becomes full, the flow meter continues to operate and log data. This mode is best used to receive the most recent data readings.

Memory Mode Configuration

1. Select

2. Select

3. Press

DATA LOG from the Advanced Options menu.

MEMORY MODE using the UP and DOWN soft keys. Press ACCEPT.

CHANGE CHOICE to pick either Slate or Wrap. Press ACCEPT.

B.14 Datalogging Configurations

1. From the Main Menu, select OPTIONS>ADVANCED OPTIONS> DATA LOG.

2. Highlight

3. Highlight the channel to log using the

require more information.

4. Press

5. Enter a logging interval using the numeric keypad, then press

intervals are shown on the status bar along the bottom edge of the display.

6. Select another channel to configure or press

Table 37 Setup Parameters for Specific Channels

Channel Name Configuration Options

1. Select Logged or Not Logged using the

Process Temperature

Rainfall section 7.1.2 on page 49

pH/ORP section 7.2.2 on page 50 and section 7.3.2 on page 51

Level / Flow Flow Units on page 25 and Level Units on page 26

Analog Inputs section 8.3.2.2 on page 67

2. Press the ACCEPT soft key to continue.

3. Enter the Logging Interval using the numeric keypad.

4. Select Temperature Units, °F or °C (this is the only place where temp. units can be changed).

SELECT INPUTS using the UP and DOWN soft keys. Press SELECT.

UP and DOWN soft keys. Certain channels

CHANGE CHOICE to select Logged or Not Logged. Press ACCEPT.

CHANGE CHOICE soft key.

ACCEPT. Valid logging

RETURN to back up one step.

B.15 Diagnostics

From the Main Menu, select OPTIONS > ADVANCED OPTIONS > DIAGNOSTICS.

In addition to the automatic diagnostics that are performed upon power up, a keypad test, LCD test, demonstration graph, velocity analysis, and events (log) are available.

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Programming Features

B.15.1 Keypad Test

Keypad Test provides a simple means of verifying the operation of all front panel keys. Selecting

Pressing any key on the front panel (except for the upper left soft key) will cause that key label to appear in the center of the display. All numeric keypad keys, soft keys, and function keys may be tested in this manner. To end, press upper left soft key operation).

B.15.2 LCD Test

LCD Test verifies all the pixels in the Liquid Crystal Display (LCD) are functional. The LCD is made up of 14,400 pixels that are turned on and off as needed to create the display of graphics and text. Each individual pixel is turned on and off by its own transistor. If a transistor fails, the pixel will not turn on, potentially causing an unreadable or confusing display.

KEYPAD TEST from the diagnostics menu will bring up the following screen:

11:00 AM 21 - APR - 01 KEYPAD TEST

QUIT

KEY PRESSED:

PRESS ANY KEY

QUIT (this also verifies the

Select

LCD TEST from the Diagnostics Menu. The display will become black for 3

seconds to verify that all pixels are functional. A defective pixel will stand out as a white dot in the field of black dots. A message, “THE DISPLAY WILL REMAIN INVERTED FOR 3 SECONDS” is shown for 2 seconds followed by a 3-second period with all dots turned on.

B.15.3 Demonstration Graph

The demonstration graph provides a small portion of demonstration data to use when learning how to use the graphing screen for the first time or for training others on its operation. No data logging is required to use the demonstration graph.

B.15.4 Velocity Analysis

A velocity probe must be installed in the flow stream and must be connected to the meter in order for this diagnostic to work. This diagnostic allows the viewing of ‘real time’ readings directly from the Submerged Depth/Velocity Probe. It shows the current velocity Signal Strength (percentage of Doppler signal returning to the probe) and a ‘real time’ velocity measurement of the flow stream. Use this diagnostic to determine that the probe is mounted for optimal velocity measurement. The closer to 100% the Signal Strength is, the more stable the velocity reading will be. If the signal seems low (50% or less), it may be due to improper installation of the probe or a lack of particulate in the flow stream.

11:00 AM 21 - APR - 01 VELOCITY ANALYSIS

SIGNAL STRENGTH: 90%

VELOCITY: 7.00 fps

RETURN

Page 97

B.15.5 Event Log

Programming Features

The event log diagnostic provides a time/date stamped list of significant events occurring in the flow meter. Review these events to find out when an event occurred and what events preceded or followed the event of interest. Events may be viewed in chronological order from the beginning or end of the event list by selecting

FROM END

respectively.

Fixed Alarms

Fixed alarms (Table 38) show the On/Off status associated with the alarm. For instance, U-sonic Echo Loss On at some time/date will appear. When the condition ends, U-sonic Echo Loss Off will appear.

Table 38 Event Log Fixed Alarms

Event Explanation

MEMORY BATTERY Internal memory battery is low.

MODEM FAILURE Modem chip/modem board failure.

U-SONIC ECHO LOSS No return signal detected.

XDUCER RINGING The return signal is detected too soon.

U-SONIC FAILURE Ultrasonic board detects an error.

RS485 TIMED OUT Communication problem with RS485.

VIEW FROM START or VIEW

Channel Alarms

Channel alarms show the value that caused the alarm to occur or go away, and show a status ON/OFF to indicate if the alarm occurred or went away at that time/date:

Event Log Channel Alarms:

B.16 Flow Totalizer

From the Main Menu, select SETUP > ADVANCED OPTIONS > FLOW TOTALIZER.

The Flow Totalizer is a series of up to three numeric counters that keep track of the total flow being measured. Two software totalizers are standard; a third mechanical totalizer is available as an option. The two software totalizers consist of a resettable totalizer and a non-resettable totalizer. Both software totalizers are set to zero upon program start.

• LEVEL • FLOW

• FLOW RATE OF CHG • pH

• RAINFALL • CH5

• CH1 • CH6

• CH2 • CH7

• CH3 • VELOCITY

• CH4 • TEMPERATURE

Scaling multipliers are provided to allow you to tailor the totalizer response to meet the requirements of the application. Some applications with high flow rates will require a high scaling factor, while low flow rates will require a low scaling factor.

The scaling factor is displayed whenever a total flow number is displayed. As indicated in the Status Screen below, the total flow is displayed as “TOTAL (x1000): 465 gal.”

Page 98

Programming Features

Multiplying the displayed total flow by the scaling factor (1000) gives you an actual total flow of 465,000 gallons.

11:00 AM 21 - APR - 01 STATUS SCREEN

LEVEL: 8.688 in.

FLOW 71.39 mgd

TOTAL (x1000): 465 gal

pH: 7.2 pH

BATTERY 16.9 volts

RUNNING

Selecting

FLOW TOTALIZER from the Advanced Options menu causes three choices to be

displayed:

• Modify Setup

• Reset

• View Totals

Modify Setup

Modify Setup allows you to select a totalizer scaling factor and a flow unit of measure.

To access the totalizer setup menu, highlight keys, then press

SELECT to continue.

MODIFY SETUP using the UP and DOWN soft

All three totalizers are scaled with one of seven scaling factors: X1, X10, X100, X1000, X10,000, X100,000 or X1,000,000. The selected scaling factor always applies to all totalizers. Press the choices and then press the

CHANGE CHOICE soft key to cycle through the available scaling

ACCEPT soft key to continue.

Totalizer Flow Units

The next screen will allow you to select a flow unit of measure (acre-feet, cubic feet, gallons, liters, and cubic meters). This selection is independent of the flow units selected in the Setup Menu.

Press

CHANGE CHOICE to cycle through the available choices then press ACCEPT to

continue.

Reset (Totalizer)

Selecting

RESET from the Totalizer menu will allow you to reset the resettable totalizer

only. The non-resettable totalizer will only be reset if one of the following conditions occur

• Change in totalizer scaling

• Change in totalizer units of measure

• Change in primary device

• Start of new program

If any of the above conditions occur, both the resettable and the non-resettable totalizers are reset.

The resettable totalizer can be used to total flow over a finite period and can be reset as often as desired without affecting the other totalizers. The optional mechanical totalizer cannot be reset.

To reset the resettable totalizer only:

Select

YES soft key to reset the totalizer or press the NO soft key if you do not wish to reset the

RESET from the TOTALIZER menu. A confirmation message will appear. Press the

totalizer.

Page 99

To reset both software totalizers at once:

Programming Features

Start a program with the

View Totals

To view the current totals of both the resettable and non-resettable totalizers, press

TOTALS

from the Totalizer menu. Both totalizer values will appear.

B.17 Screen Saver Mode

From the Main Menu, select SETUP > ADVANCED OPTIONS > SCREEN SAVER MODE.

The power required to properly light the LCD can consume valuable battery life. Screen Saver Mode is a power saving feature.

B.18 Battery Power

When the flow meter senses that it is operating on battery power, Screen Saver Mode conserves battery life by automatically turning the LCD display off after 3 minutes of keypad inactivity. Pressing any key will turn the LCD display back on. No configuration is required; the meter automatically senses ac or battery operation on power up.

B.19 ac Power

When operated under ac power, Screen Saver Mode can be enabled or disabled manually. Enabling the Screen Saver when operating on ac power will prolong the life of the LCD display by minimizing its use.

RUN/STOP key.

VIEW

To change the Screen Saver mode:

1. Highlight

DOWN arrow soft keys, then press SELECT.

2. Press

Press

B.20 Set Point Sampling

Set point sampling allows the control of an automatic liquid sampler from up to 14 different sources individually or simultaneously. Upon reaching a user-defined set point trigger, the flow meter provides an output signal at the Sampler Interface. This signal can be used to tell a sampler such as the Model SD900 Sampler that a set point condition has been reached and samples should be taken.

Set Point sampling defines a set of limits that inhibit sampling until an upset condition occurs, causing the limits to be exceeded. In this manner, time and money and collecting and testing samples that are within limits is not wasted, because sampling is enabled only when the waste stream falls outside the set points. Table 39 shows all possible sampling triggers and appropriate settings.

SCREEN SAVER MODE on the Advanced Options Menu using the UP and

CHANGE CHOICE to select a new Screen Saver Mode (Enabled or Disabled). ACCEPT to save the changes.

Table 39 Sampling Triggers

Sampling Trigger Settings

Level High and/or Low condition, deadband

Flow High and/or Low condition, deadband

Flow Rate of Change High condition within time interval

Temperature High and/or Low condition, deadband

pH High and/or Low condition, deadband

Rainfall High condition within time interval

Page 100

Programming Features

To enable Set Point Sampling:

Table 39 Sampling Triggers

Sampling Trigger Settings

Analog Input Channel 1 High and/or Low condition, deadband

Analog Input Channel 2 High and/or Low condition, deadband

Analog Input Channel 3 High and/or Low condition, deadband

Analog Input Channel 4 High and/or Low condition, deadband

Analog Input Channel 5 High and/or Low condition, deadband

Analog Input Channel 6 High and/or Low condition, deadband

Analog Input Channel 7 High and/or Low condition, deadband

B.21 Stormwater

1. From the Main Menu, select

OPTIONS> ADVANCED OPTIONS > SETPOINT SAMPLING.

2. Highlight SETPOINT SAMPLING using the UP and DOWN soft keys, then press

SELECT.

3. Highlight the desired sampling trigger (see Table 39), then press

4. Highlight either

5. Press

Note: You must log rainfall to use set point sampling on a rainfall condition; likewise, you must log flow in order to implement set point sampling on a flow rate of change. If you forget, you are reminded when the program begins.

CHANGE CHOICE to enable or disable the sampling trigger for this condition.

SAMPLE ON HIGH CONDITION or SAMPLE ON LOW CONDITION.

SELECT.

6. Enter the desired high or low trigger point using the numeric keypad, then press

ACCEPT.

7. Enter a deadband value (see Setting the Deadband on page 90) or, if programming

for Flow Rate Of Change or Rainfall, enter a time interval within which the flow or rainfall change must take place.

Sample on High Condition and Sample on Low Condition can be enabled at the same time. There is no limit to the number of sampling triggers that can be enabled at one time.

A stormwater monitoring program designed specifically to meet the NPDES stormwater requirements is built in to the Sigma 950 Flow Meter. Rainfall is monitored with an optional Rain Gauge. A connection is then made from the flow meter Sampler Interface to an automatic liquid sampler.

A typical stormwater program might be configured to activate when a storm causes a level of at least 3 in. (7.6 cm) in the outfall channel and 0.10 in. (2.5 mm) of rainfall within 30 minutes. Or, it might be desirable to activate the program if either the rainfall occurs or the channel level exceeds the limit. Any combination of rainfall and level conditions can be used to activate a stormwater program. Specific requirements can vary, however, from state to state. Consult state regulatory groups for recommendations on stormwater permit requirements for specific applications.

1. To configure the Stormwater program in the flow meter, proceed as follows:

2. From the Main Menu, select

OPTIONS > ADVANCED OPTIONS > STORM WATER.

3. Highlight STORM WATER on the Advanced Options Menu, then press the SELECT.

4. Press

CHANGE CHOICE to enable Storm Water, then press ACCEPT.

5. Select a Start Condition: