Hach 6120118 User Manual

Catalog Number 6120118

Digital PC sc and RC sc ¾-inch

Combination pH/ORP Sensor

USER MANUAL

October 2005, Edition 4

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Section 1 Specifications.........................................................................................................................................5

Section 2 General Information............................................................................................................................... 7

2.1 Safety Information............................................................................................................................................... 7

2.1.1 Use of Hazard Information......................................................................................................................... 7

2.1.2 Precautionary Labels................................................................................................................................. 7

2.2 General Sensor Information................................................................................................................................ 8

2.2.1 Sensor Body Styles ....................... ... .... ... ... ............................................................................................... 8

2.3 The Digital Gateway............................................................................................................................................ 9

2.4 Operating Precaution .......................................................................................................................................... 9

Section 3 Installation ............................................................................................................................................ 11

3.1 Wiring the sc Sensor to the Digital Gateway..................................................................................................... 11

3.2 Connecting/Wiring the Digital Gateway to the sc100 Controller ....................................................................... 13

3.2.1 Connecting the Digital Gateway Sensor in a Non-hazardous Location................................................... 13

3.2.1.1 Attaching the Digital Gateway with a Quick-connect Fitting in a Non-hazardous Location............13

3.2.1.2 Hard-wiring the Digital Gateway to the sc100................................................................................ 14

3.2.2 Connecting the Digital Gateway to a sc100 Controller in a Hazardous Location .................................... 15

3.2.2.1 Attaching the Digital Gateway with a Quick-Connect Fitting in a Hazardous Location.................. 16

3.3 Connecting the Sensor to the sc1000............................................................................................................... 16

3.3.1 Connecting the Sensor using the Quick-connect Fittings........................................................................16

3.4 Mounting the Digital Gateway ........................................................................................................................... 17

Section 4 User Interface and Navigation ............................................................................................................ 19

4.1 Using the sc100 Controller...................................... .......................................................................................... 19

4.1.1 Controller Display Features ..................................................................................................................... 20

4.1.2 Important Key Presses............................................................................................................................ 20

4.2 Using the sc1000 Controller.................................... .......................................................................................... 21

4.2.1 Display Features...................................................................................................................................... 21

4.2.1.1 Using the Pop-up Toolbar..............................................................................................................21

4.2.1.2 Using the Menu Windows .............................................................................................................. 21

4.2.1.3 Navigating the Menu Windows .... ... ... ............................................................................................. 22

Section 5 Operation .............................................................................................................................................. 25

5.1 Sensor Setup .................................................................................................................................................... 25

5.2 Sensor Data Logging ........................................................................................................................................ 25

5.6 pH Calibration ................................................................................................................................................... 28

5.6.1 One Point Automatic Calibration.............................................................................................................. 28

5.6.2 Two Point Automatic Calibration.............................................................................................................. 28

5.6.3 One Point Manual Calibration.................................................................................................................. 29

5.6.4 Two Point Manual Calibration .................................................................................................................. 29

5.7 ORP Calibration................................................................................................................................................ 30

5.7.1 One-point Manual Calibration.................................................................................................................. 30

5.8 Concurrent Calibration of Two Sensors for pH and ORP.................................................................................. 30

5.9 Adjusting the Temperature ................................................................................................................................ 31

Section 6 Maintenance ......................................................................................................................................... 33

6.1 Maintenance Schedule ..................................................................................................................................... 33

6.2 Cleaning the Sensor ......................................................................................................................................... 34

Section 7 Troubleshoot in g ................................................................................................................................... 35

7.1 Error Codes....................................................................................................................................................... 35

7.2 Warnings........................................................................................................................................................... 35

Table of Contents

7.3 Troubleshooting the pH or ORP Sensor............................................................................................................35

Section 8 Replacement Parts and Accessorie s..................................................................................................37

8.1 Replacement Items, Accessories, and Reagent and Standards .......................................................................37

Section 9 How to Order.........................................................................................................................................39

Section 10 Repair Service.....................................................................................................................................40

Section 11 Limited Warranty................................................................................................................................41

Section 12 Compliance Information ....................................................................................................................43

B.1 pH Measurement Theory............................................................................................................................47

B.2 PID Controller Basics .................................................................................................................................48

Section 1 Specifications

Specifications are subject to change without notice.

Table 1 Combination pH and ORP Sensor Specifications

Components Corrosion-resistant materials, fully-immersible probe with 4.6 m (15 ft) cable Measuring Range (pH) 0 to 14 pH Measuring Range (ORP) –2000 to +2000 mV Measuring Range (Temperature) 0 to 105 °C (32 to 221 °F) Probe Operating Temperature 0 to 105 °C (32 to 221 °F) Probe Storage Temperature –30 to 70 °C (–22 to 158 °F); 0 to 95% relati ve humidity, non-condensing

Temperature Compensation

Accuracy (Analyzer only)

Stability (Analyzer only) 0.05% or span per 24 hours, non-cumulative Repeatability (Analyzer only) 0.1% of span or better

pH: Pt 1000 ohm RTD ORP: N/A

pH: 0.1% of span ORP: Limited to calibration solution accuracy (± 20 mV)

Temperature Accuracy (Analyzer only) ±0.5 °C (±0.9 °F) Temperature Drift (Analyzer only) Zero and Span: less than 0.03% of span per °C Calibration Methods (Analyzer only) Two point automatic, one point automatic, two point manual, one point manual Maximum Probe Immersion Depth/

Pressure Sensor Interface Modbus from digital gateway Probe Cable Length 4.6 m (15 ft) Probe Weight Depends on selected sensor Probe Dimensions See Figure 1 on page 8 through Figure 4 on page 9.

Submersible to 107 m (350 ft)/1050 kPa (150 psi)

Table 2 Digital Gateway Specifications

Weight 145 g (5 oz)

Dimensions 17.5 x 3.4 cm (7 x 1 Operating Temperature –20 to 60 °C (–4 to 140 °F)

/8 in.)

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Section 2 General Information

2.1 Safety Information

Please read this entire manual before unpacking, setting up, or operatin g this equipment. Pa y attentio n to all danger an d caution state ments. 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.

This product is acceptable for use in a Hazardous Location when used with an sc100 Controller and installed per Control Drawing 58600-78 as described in the sc100 Controller Man ual, Cat. No. 5860018.

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 that 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).

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

General Information

2.2 General Sensor Information

Optional equipment, such as mounting hardware for the probe, is supplied with instructions for all user installation tasks. Several mounting options are availa b le, allowing the probe to be adapted for use in many different applications.

2.2.1 Sensor Body Styles

Combination pH and ORP sensors are available in three body styles:

• Convertible Body Style (Figure 1 and Figure 2)— has ¾-in. NPT threads at both ends of the body for mounting in any of the following configurations:

• into a standard ¾-in. NPT pipe tee

• onto the end of a pipe for immersion into a vessel

• Insertion Body Style (Figure 3)— for mounting into the pipe adapter of a ball valve

hardware assembly. This hardware enab les the sen sor to be inserted into or retracted from the process without stopping the process flow.

• Sanitary Body Style (Figure 4)— features a built-in 2-in. flange for mounting into a 2-in. sanitary tee. Included with the sanitary-style sensor is a special cap and EDPM compound gasket for use with the sanitary hardware.

Figure 1 Convertible Style Sensor with Flat Electrode

-inch NPT Typical

22.9 mm (0.90 inch)

149.9 mm (5.9 inches)

Figure 2 Convertible-style Sensor with Dome Electrode

¾-inch NPT

Typical

22.9 mm (0.90 inch)

149.9 mm (5.9 inches)

22.2 mm (0.875 inch)

7.62 mm (1.30 inches)

22.2 mm (0.875 inch)

7.62 mm (1.30 inches)

Figure 3 Insertion Style Sensor with Domed Electrode

22.2 mm (0.875 inches)

149.9 mm (5.9 inches)

Figure 4 Sanitary-style Sensor

General Information

22.2 mm (0.875 inches)

187.3 mm (7.37 inches)

2.3 The Digital Gateway

The digital gatewa y was de v eloped to pro vide a means to use e xisting analog sensors with the new digital controllers . The gate w a y contains all the necessary software and hardw are to interface with the controller and output a digital signal.

2.4 Operating Precaution

Before placing the pH or ORP sensor into operation, remove the protective cap to expose the process electrode and reference junction. Save the protective cap for future use.

For short-term storage (when sensor is out of the process for more than one hour), fill the protective cap with pH 4 buffer or DI water and place the cap back on the sensor. K ee ping the process electrode and reference junction moist will avoid slow response when the sensor is placed back in operation.

49.1 mm (1.96 inches)

22 mm (0.87 inches)

88.9 mm (3.5 inches)

For extended storage, repeat the short-term storage procedure every 2 to 4 weeks, depending on the surrounding environmental conditions.

CAUTION If the pH process electrode breaks, handle the sensor very carefully to prevent injury.

The process electrode at the pH sensor tip has a glass bulb, which can break. Do not subject this electrode to abrupt impact or other mechanical abuse.

The gold or platinum process electrode at the ORP sensor tip has a glass shank (hidden by the salt bridge) which can break. Do not subject this electrode to impact or other mechanical abuse.

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Section 3 Installation

DANGER Only qualified personnel should conduct the tasks described in this section of the manual.

DANGER Seul un technicien qualifié peut effectuer les tâches d'installation décrites dans cette section du manuel.

The Combination pH/ORP Sensor can be used with either an sc100 or sc1000 controller. Refer to section 3.2 on page 13 for sc100 installation instructions and section 3.3 on

page 16 for sc1000 installation instructions.

The sc sensor should be wired to the digital gate wa y bef ore connecting th e digital gatew a y to the sc100 or sc1000 Controller. The digital gateway is designe d to provide a digital interface to the appropriate digital controller. Refer to section 3.1 for more information.

3.1 Wiring the sc Sensor to the Digital Gateway

DANGER The sc100 and certain versions of the sensor are suitable for use in Class 1, Division 2, Groups A, B, C, D Hazardous Locations . See Control Drawing 58600-78 in the sc100 Controller Manual, Cat. No. 58600-18 for acceptable sensor versions and installation requirements.

DANGER Le sc100 et certaines versions du capteur peuvent être utilisés dans des endroits dangereux de la Classe 1, Division 2, Gr oupes A, B, C, D . Reportez-v ous au schéma de contrôle 58600-78 du Manuel du contrôl eur sc100, Réf. 58600-18 pour connaître les versions des capteurs admises et les conditions d'installation.

1. Route the cable from the sensor through the strain relief in the digital gateway then properly terminate the wire ends (see Figure 5).

Note: Do not tighten the strain relief until the digital gateway is wired and the two halves are threaded securely together.

2. Insert the wires as shown in Table 3 and Figure 6.

3. Make sure the O-ring is properly installed between the two halves of the digital

gateway and thread the two halves together. Hand tighten.

4. Tighten the strain relief to secure the sensor cable.

5. Connect the digital gateway to the controller.

• sc100 Non-hazardous Location–section 3.2.1.1 on page 13

• sc100 Hazardous Location—section 3.2.2.1 on page 16

• sc1000 Connection Instructions—Refer to section 3.3 on page 16.

Installation

Figure 5 Proper Wire Preparation and Insertion

1. Strip ¼-inch of insulation. 2. Seat insulation against connector with no bare wire exposed.

Figure 6 Wiring and Assembling the Digital Gateway

METAL BRAID

RED

WHT

CLEAR

BLU

5432

1. Digital gateway front 7. Cord grip

2. O-ring 8. From sensor

3. Sensor wire connector 9. Insert wires into connector according to Table 3. Use the included 2 mm

screwdriver (Cat. No. 6134300) to secure connections.

4. Digital gateway back 10. Screw back of digital gateway onto front.

5. Cable bushing 11. Push cable bushing and anti-rotation washer into back.

6. Anti-rotation washer 12. Fasten cord grip securely. Assembly is complete.

Table 3 Wiring the Digital Gateway (Cat. No. 6120800)

Installation

Sensor (wire color) Sensor Signal without Ground Rod Sensor Signal with Ground Rod

Metal Braid

White Temp + Temp + J3-2

Clear Active/Measuring Active/Measuring J1-5

not used not used not used J1-6

Some applications require the use of an external ground rod with the combination electrode. Use this wiring scheme for these applications.

If Metal Braid is “tinned”, cut the tinned area off and twist the wire to inser t into connector.

Customer-supplied (required)

Red Temp – Temp – J3-3

Blue Ref Solution Ground J3-4

Jumper 2 from J3-1 to J3-3

Ref J3-1

Digital Gateway

3.2 Connecting/Wiring the Digital Gateway to the sc100 Controller

The digital gateway should be wired to the sensor before connecting to the controller.

3.2.1 Connecting the Digital Gateway Sensor in a Non-hazardous Location

3.2.1.1 Attaching the Digital Gateway with a Quick-connect Fitting in a Non-hazardous Location

Important Note: The standard quick-connect f itting is NOT suitable for Class 1, Division 2 Hazardous Location installations without the connector lock installed, see section 3.2.1 on

page 13 for more information.

The digital gateway is supplied with a keyed quick-connect fitting for easy attachment to the controller, see Figure 7. Retain the connector cap to seal the connector opening in case the sensor must be removed. Optional extension cables may be purchased to extend the sensor cable length. If t he tota l cable length exceeds 100 m (328 ft), a termination bo x must be installed. See Replacement Parts and Accessories on page 37.

Installation

Figure 7 Attaching the Digital Gateway using the Quick-connect Fittings

3.2.1.2 Hard-wiring the Digital Gateway to the sc100

Important Note: Hard-wiring the digital gateway to the sc100 is not an approved method for Class 1, Division 2 Hazardous Locations.

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 8 on page 15.

4. Remove the quick-conn ect 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.

Note: Use of strain relief fitting other than Cat. No. 16664 may result in a hazard. Use only the recommended strain relief fitting.

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.

8. Reinstall the plug on the sensor access opening to maintain the envir onmenta l rati ng.

9. Wire as shown in Table 4 and Figure 8.

10. Close and secure the cover.

Table 4 Wiring the Sensor at Terminal Block J5

DATA

OUT 2

– DATA

– OUT 2

SERVICE REQUEST

SHIELD/CHASSIS GND

OUT 1

GND

– OUT 1

PROBES

ANALOG OUTPUTS

PCB

CONNECTOR

FIELD WIRING

INSULATION MUST

BE RATED TO

80° C MINIMUM

NCNCNC

COMCOMCOM

NONO

RELAY3RELAY2RELAY1

DATA

OUT 2

– DATA

– OUT 2

SERVICE REQUEST

SHIELD/CHASSIS GND

OUT 1

GND

– OUT 1

PROBES

ANALOG OUTPUTS

PCB

CONNECTOR

FIELD WIRING

INSULATION MUST

BE RATED TO

80° C MINIMUM

DATA+DATA

OUT 2+OUT 2

– DATA

– OUT 2

SERVICE REQUESTSERVICE REQUEST

SHIELD/CHASSIS GND

+V+

OUT 1+OUT 1

GND

– OUT 1

PROBES

ANALOG OUTPUTSANALOG 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

NONO

RELAY3RELAY2RELAY1

DATA+DATA

OUT 2+OUT 2

– DATA

– OUT 2

SERVICE REQUESTSERVICE REQUEST

SHIELD/CHASSIS GND

+V+

OUT 1+OUT 1

GND

– OUT 1

PROBES

ANALOG OUTPUTSANALOG 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

NETWORK INTERFACE

CARD

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

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)

Figure 8 Hard-wiring the Digital Gateway

NETWORK INTERFACE

CARD

DATA

SERVICE REQUEST

J5J5

PCB

CONNECTOR

DANGER - EXPLOSION HAZARD

DO NOT DISCONNECT WHILE CIRCUIT IS LIVE

UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.

DANGER - RISQUE D'EXPLOSION

NE PAS DEBRANCHER TANT QUE LE EST SOUS

TENSION, A MONIS QU'IL NE S'AGISSE D'UN

EMPLACEMENT NON-DANGEROUX

ANALOG OUTPUTS

FIELD WIRING

INSULATION MUST

BE RATED TO

80° C MINIMUM

OUT 2

OUT 1

Disconnect Power

Installation

From Probe

3.2.2 Connecting the Digital Gateway to a sc100 Controller in a Hazardous Location

Explosion hazard. Do not connect or disconne ct eq uipment unle ss po we r has been switched off or the area is known to be non-hazardous.

DANGER Risque d’explosion. Couper le courant ou s’assurer que l’emp lacement est designe non dangereux avant de replacer le aucon composant.

DANGER

Installation

3.2.2.1 Attaching the Digital Gateway with a Quick-Connect Fitting in a Hazardous Location

The digital gateway is supplied with a keyed quick-connect fitting for easy attachment to the controller , see Figur e 7 on page 14. For Hazardous Locations, a conn ector saf ety loc k (Cat. No. 6139900) must be installed. Retain the connector cap to seal the connector opening in case the sensor must be removed.

1. Remove the connector cap from the sc100 controller . Reta in the connector cap to seal the connector opening in case the sensor must be removed.

2. Connect the digital gateway connector to the sensor plug on the sc100.

3. Install the connector safety lock (Figure 9). Align the lock over the connecto r and

squeeze the two halv es together to loc k. To remo ve the connector saf ety loc k, insert a small flat-blade screwdriver into the locking groove. Pivot the screwdriver away from the groove and separate the two halves (Figure 9).

Figure 9 Installing the Connector Safety Lock

38.1 mm

(1.50 inches)

38.1 mm

(1.50 inches)

3.3 Connecting the Sensor to the sc1000

3.3.1 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 digital gateway 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.

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