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1720E
User Manual
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Hach-Lange 1720E User Manual

DOC023.52.03221.May07
1720E Low Range Turbidimeter
USER MANUAL
May 2007, Edition 7
© HACH LANGE GmbH, 2007. All rights reserved. Printed in Germany.
DOC023.52.03221.May07
1720E Low Range Turbidimeter
USER MANUAL
May 2007, Edition 7
© HACH LANGE GmbH, 2007. All rights reserved. Printed in Germany.
Table of Contents
Section 2 General Information ............................................................................................................................... 5
2.1 Safety Information............................................................................................................................................... 5
2.1.1 Use of Hazard Information......................................................................................................................... 5
2.1.2 Precautionary Labels................................................................................................................................. 5
2.1.3 General Product Information ..................................................................................................................... 6
2.2 Theory of Operation ............................................................................................................................................ 7
Section 3 Installation .............................................................................................................................................. 9
3.1 Connecting/Wiring the Sensor to the sc100 Controller ....................................................................................... 9
3.1.1 Attaching a sc Sensor with a Quick-connect Fitting .................................................................................. 9
3.1.2 Hard-wiring a sc Sensor to the sc100 Controller ..................................................................................... 10
3.2 Connecting the Sensor to the sc1000 Controller .............................................................................................. 11
3.2.1 Connecting the Sensor using the Quick-connect Fittings........................................................................ 11
3.3 Turbidimeter Installation Information................................................................................................................. 11
3.3.1 Mounting the Turbidimeter Body ............................................................................................................. 13
3.3.2 Installing the Head Assembly .................................................................................................................. 13
3.4 Installing a Sample Line.................................................................................................................................... 13
3.5 Sample Connections......................................................................................................................................... 14
Section 4 System Startup..................................................................................................................................... 15
4.1 General Operation ............................................................................................................................................ 15
4.2 Starting Sample Flow........................................................................................................................................ 15
Section 5 Operation .............................................................................................................................................. 17
5.1 Sensor Setup .................................................................................................................................................... 17
5.2 Sensor Data Logging ........................................................................................................................................ 17
5.3 Sensor Diagnostics Menu ................................................................................................................................. 17
5.4 Sensor Setup Menu .......................................................................................................................................... 18
5.5 Sensor Calibration and Verification................................................................................................................... 18
5.5.1 User-prepared Calibration ....................................................................................................................... 19
5.5.2 Calibration with StablCal
5.5.3 Instrument Verification............................................................................................................................. 21
5.5.3.1 Dry Verification............................................................................................................................... 21
5.5.3.2 Wet Verification .............................................................................................................................. 21
5.6 Calibration and Verification History ................................................................................................................... 22
5.7 Offset Feature ................................................................................................................................................... 22
5.7.1 Setting the Offset..................................................................................................................................... 23
Section 6 Maintenance ......................................................................................................................................... 25
6.1 Maintenance Schedule ..................................................................................................................................... 25
6.2 Removing a Sensor from the System ............................................................................................................... 25
6.3 Reinstalling a Sensor on the System ................................................................................................................ 25
6.4 Cleaning............................................................................................................................................................ 26
6.4.1 Cleaning the Photocell Window............................................................................................................... 26
6.4.2 Cleaning the Turbidimeter Body and Bubble Trap .................................................................................. 26
6.4.3 Replacing the Lamp Assembly ................................................................................................................ 27
® .......................................................................................................................................................20
Section 7 Troubleshooting................................................................................................................................... 29
7.1 Error Codes....................................................................................................................................................... 29
7.2 Warnings........................................................................................................................................................... 29
7.3 Event Codes ..................................................................................................................................................... 31
1
Table of Contents
Section 8 Replacement Parts and Accessories..................................................................................................33
8.1 Replacement Items............................................................................................................................................33
8.2 Optional Accessories.........................................................................................................................................33
8.3 Calibration and Verification Standards and Accessories................................................................................... 34
Section 9 Contact ................................................................................................................................................. 35
Section 10 Warranty and liability ........................................................................................................................ 37
Section 11 Compliance Information .................................................................................................................... 39
Appendix A Modbus Register Information..........................................................................................................41
Index .......................................................................................................................................................................43
2

Section 1 Specifications

Specifications are subject to change without notice.
Table 1 1720E Low Range Specifications
Range 0–100 nephelometric turbidity units (NTU)
Measurement Units mg/L, NTU, TE/F, FTU, Degree
± 2% of reading or ± 0.02 NTU (whichever is greater) from 0 to 40 NTU; ± 5% of reading from 40 to 100 NTU (when calibration is performed at 20.0 NTU with the offset turned off).
Better than 1% 0–40 NTU on formazin. Allows for accurate calibration at high turbidity values.
Accuracy
Linearity
1
1
Resolution (Displayed)
Repeatability Better than ±1.0% of reading or ±0.002 NTU, whichever is greater
Response Time
Sample Flow Required 250 to 750 mL/minute
Storage Temperature –20 to 60 °C (–4 to 140 °F)
Operating Temperature 0 to 50 °C (32–122 °F) for single sensor system, 0 to 40 °C (32–104 °F) for two sensor system
Sample Temperature Range
Operating Humidity 5 to 95% non-condensing
0.0001 NTU up to 9.9999 NTU; 0.001 NTU from 10.000 to 99.999 NTU; 0.01 NTU at 100.00 NTU
For a full-scale step change, initial response in 1 minute, 15 seconds. Varies with flow rate, see the table below. The response time is also dependent on the signal averaging time, which is user selectable.
Flow Rate
% Step Change
750 500 250
10 1¼ minutes 1½ minutes 2½ minutes 50 2 minutes 2½ minutes 6 minutes 90 3½ minutes 3½ minutes 9 minutes 99 4 minutes 5 minutes 12 minutes
0 to 70 °C
Power Requirements 12 VDC ± 5%, 12.5 Watts maximum
1
Sample Inlet Fitting
Signal Average Time no averaging, 6, 30, 60, and 90 seconds, user selectable. Default is 30 seconds.
Dimensions Turbidimeter body and cap: 25.4 x 30.5 x 40.6 cm (10 x 12 x 16 inches)
Sensor Cable Length 2 m (6.6 ft); Optional 7.62 m (25 ft)
Mounting Options Turbidimeter Body and Head Assembly: Wall; floor stand
Shipping Weight
Calibration Methods
/8 barb fitting to ¼-inch NPT male adapter
1720E Series 2 Turbidimeter and Controller: 6.31 kg (13.5 lb); 1720E Turbidimeter only: 4.71 kg (10 lb)
1. StablCal Recommended at 20.0 NTU.
2. Formazin – user-prepared primary or wet calibration of the instrument. Recommended at
20.0 NTU.
3. Multi-sensor calibration – Performed with a specialized calibration procedure for up to eight sensors on a single set of fresh StablCal
®
(stabilized formazin) – primary or wet calibration of the instrument.
®
standards.
3
Specifications
Table 1 1720E Low Range Specifications (continued)
1. StablCal
Verification (Wet) Method
2. Formazin – fresh user-prepared standard
1. ICE-PIC™ Verification Module with factory-set values of 20.0 or 1.0 ±25%. Unique value
Verification (Dry) Method
Recommended Maintenance
Installation Environment Indoor
1. Lamp replacement: once per year.
2. Cleaning: mandatory before calibration, optional before calibration, and mandatory upon
®
(stabilized formazin) – recommended for verification in the appropriate application range of measurement. For regulatory verification, standards of 0.1 to 50 NTU.
is assigned when dry verification is done immediately after calibration and is used as pass/fail criteria for subsequent verifications.
verification failure.
Primary Compliance Method
Limit of Detection
1
All specifications are based on a calibration with 20.0 NTU formazin and with the offset turned off.
1
USEPA 180.1; Hach Method 8195; ASTM D 6698; Standard Methods 2130B
0.0032 NTU (according to criteria specified by ISO 15839)
4

Section 2 General Information

2.1 Safety Information

Please read this entire manual before unpacking, setting up, or operating this equipment. Pay attention to all danger and caution statements. Failure to do so could result in serious injury to the operator or damage to the equipment.
To ensure that the protection provided by this equipment is not impaired, do not use or install this equipment in any manner other than that specified in this manual.

2.1.1 Use of Hazard Information

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.
Important Note: Information the requires special emphasis.
Note: Information that supplements points in the main text.

2.1.2 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.
This symbol, when noted on a product enclosure or barrier, indicates that a risk of electrical shock and/or electrocution exists.
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).
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.
5
General Information

2.1.3 General Product Information

The 1720E Turbidimeter is a continuous-reading nephelometric turbidimeter designed for low-range turbidity monitoring. This process turbidimeter is capable of measuring turbidity from 0.001 to 100.0 NTU. Calibration is based on formazin, the primary turbidity reference standard adopted by the APHA Standard Methods for the Examination of Water and Wastewater and the U.S. Environmental Protection Agency (EPA) and on StablCal is also recognized as a primary standard.
The 1720E Turbidimeter can be operated using an sc controller. Refer to the Operation section (Section 5 on page 17) for more information.
®
which
6

2.2 Theory of Operation

The 1720E Turbidimeter measures turbidity by directing a strong beam of collimated light from the sensor head assembly down into the sample in the turbidimeter body. Light scattered at 90° relative to the center line of incident light by suspended particles in the sample is detected by the submerged photocell (Figure 1).
The amount of light scattered is proportional to the turbidity of the sample. If the turbidity of the sample is negligible, little light will be scattered and detected by the photocell and the turbidity reading will be low. High turbidity, on the other hand, will cause a high level of light scattering and result in a high reading.
Sample enters the turbidimeter body and flows through the baffle network of the bubble trap. The flow allows bubbles to either cling to surfaces of the baffle system or rise to the surface and vent to atmosphere. After traveling through the bubble trap, sample enters the center column of the turbidimeter body, rises into the measuring chamber and spills over the weir into the drain port. A reading is taken once per second.
Figure 1 90 Degree Detector
General Information
1. Lamp 3. Aperture 5. 90° Detector
2. Lens 4. Water Level
7
General Information
8

Section 3 Installation

DANGER Only qualified personnel should conduct the tasks described in this section of the manual. The 1720E/sc100 product configuration is not intended for installation in hazardous locations.

3.1 Connecting/Wiring the Sensor to the sc100 Controller

3.1.1 Attaching a sc Sensor with a Quick-connect Fitting

The sensor cable is supplied with a keyed quick-connect fitting for easy attachment to the controller, see Figure 2. Retain the connector cap to seal the connector opening in case the sensor must be removed. The 1720E sensor cable may be extended by a maximum of
7.62 m (25 ft), see Replacement Parts and Accessories on page 33.
Figure 2 Attaching the Sensor using the Quick-connect Fitting
9
Installation

3.1.2 Hard-wiring a sc Sensor to the sc100 Controller

1. Disconnect power to the controller if powered.
2. Open the controller cover.
3. Disconnect and remove the existing wires between the quick-connect and terminal
strip J5, see Figure 3.
4. Remove the quick-connect fitting and wires and install the threaded plug on the opening to maintain the environmental rating.
5. Cut the connector from the sensor cable.
6. Strip the insulation on the cable back 1-inch. Strip ¼-inch of each individual wire end.
7. Pass the cable through conduit and a conduit hub or a strain relief fitting
(Cat. No. 16664) and an available access hole in the controller enclosure. Tighten the fitting.
Note: Use of strain relief fitting other than Cat. No. 16664 may result in a hazard. Use only the recommended strain relief fitting.
8. Reinstall the plug on the sensor access opening to maintain the environmental rating.
9. Wire as shown in Table 2 and Figure 3.
10. Close and secure the cover.
Table 2 Wiring the Sensor at Terminal Block J5
Terminal Number Terminal Designation Wire Color
1 Data (+) Blue 2 Data (–) White 3 Service Request No Connection 4 +12 V dc Brown 5 Circuit Common Black 6 Shield Shield (grey wire in existing quick disconnect fitting)
10
Figure 3 Hard-wiring the Sensor
1
1
+
DATA
+
OUT 2
– DATA
– OUT 2
SERVICE REQUEST
SHIELD/CHASSIS GND
+
V
+
OUT 1
GND
– OUT 1
2
2
3
3
4
4
5
5
6
PROBES
ANALOG OUTPUTS
PCB
CONNECTOR
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
NCNCNC
COMCOMCOM
NO
F1
F2
NONO
RELAY3RELAY2RELAY1
1
1
+
DATA
+
OUT 2
– DATA
– OUT 2
SERVICE REQUEST
SHIELD/CHASSIS GND
+
V
+
OUT 1
GND
– OUT 1
2
2
3
3
4
4
5
5
6
PROBES
ANALOG OUTPUTS
PCB
CONNECTOR
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
1
1
+
DATA+DATA
+
OUT 2+OUT 2
– DATA
– OUT 2
SERVICE REQUEST
SHIELD/CHASSIS GND
+V+
V
+
OUT 1+OUT 1
GND
– OUT 1
2
2
3
3
4
4
5
5
6
PROBES
ANALOG OUTPUTS
PCB
CONNECTOR
PCB
CONNECTOR
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
DANGER - EXPLOSION HAZARD
DANGER - RISQUE D'EXPLOSION
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE
UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.
NE PAS DEBRANCHER TANT QUE LE EST SOUS
TENSION, A MONIS QU'IL NE S'AGISSE D'UN
EMPLACEMENT NON-DANGEROUX
NCNCNC
COMCOMCOM
NO
F1
F2
NONO
RELAY3RELAY2RELAY1
1
1
+
DATA+DATA
+
OUT 2+OUT 2
– DATA
– OUT 2
SERVICE REQUEST
SHIELD/CHASSIS GND
+V+
V
+
OUT 1+OUT 1
GND
– OUT 1
2
2
3
3
4
4
5
5
6
PROBES
ANALOG OUTPUTS
PCB
CONNECTOR
PCB
CONNECTOR
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
J1
J2
J4
NETWORK
INTERFACE
CARD
J3
U5
U9
S1
DANGER - EXPLOSION HAZARD
DANGER - RISQUE D'EXPLOSION
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE
UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.
NE PAS DEBRANCHER TANT QUE LE EST SOUS
TENSION, A MONIS QU'IL NE S'AGISSE D'UN
EMPLACEMENT NON-DANGEROUX
J1
S1
J2
U5
J4
U9
NETWORK
INTERFACE
CARD
J3
J5J5
J5
J5
J6
PCB
PCB
CONNECTOR
CONNECTOR
DANGER - EXPLOSION HAZARD
DANGER - EXPLOSION HAZARD
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE
UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.
UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.
DANGER - RISQUE D'EXPLOSION
DANGER - RISQUE D'EXPLOSION
NE PAS DEBRANCHER TANT QUE LE EST SOUS
NE PAS DEBRANCHER TANT QUE LE EST SOUS
TENSION, A MONIS QU'IL NE S'AGISSE D'UN
TENSION, A MONIS QU'IL NE S'AGISSE D'UN
EMPLACEMENT NON-DANGEROUX
EMPLACEMENT NON-DANGEROUX
+
DATA
+
DATA
+
V
+
V
+
OUT 2
+
OUT 2
+
OUT 1
+
OUT 1
FIELD WIRING
FIELD WIRING
INSULATION MUST
INSULATION MUST
BE RATED TO
BE RATED TO
80° C MINIMUM
80° C MINIMUM
Installation
Disconnect Power
From Probe

3.2 Connecting the Sensor to the sc1000 Controller

3.2.1 Connecting the Sensor using the Quick-connect Fittings

1. Unscrew the connector cap from the controller. Retain the connector cap to seal the
connector opening in case the sensor must be removed.
2. Push the connector into the socket.
3. Hand-tighten the union nut.
Note: Do not use the middle connection for the sensors as this is reserved for the display module.

3.3 Turbidimeter Installation Information

The turbidimeter body is designed for wall-mounting (although it may be mounted on the optional floor stand). The turbidimeter sensor must be mounted within six feet of the controller unless an extension cable is used. Maximum cable length is 9.6 m (31 feet).
11
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