Hach-Lange 3705 sc User Manual

DOC023.52.00022.Jul05

3700 sc Inductive Conductivity Sensor

Operation Manual

DOC023.52.00022.Jul05

3700sc Digital Conductivity Sensor

Opration Manual

Table of Contents

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

2.3 The Digital Gateway............................................................................................................................................ 8

2.4 Theory of Operation............................................................................................................................................ 8

Section 3 Installation .............................................................................................................................................. 9

3.1 Wiring the sc Sensor to the Digital Gateway....................................................................................................... 9

3.2 Connecting Digital Gateway to the sc Controller............................................................................................... 11

3.2.1 Attaching a sc Sensor with a Quick-connect Fitting ................................................................................ 11

3.3 Mounting the Digital Gateway ........................................................................................................................... 12

3.4 Installing the Sensor in the Sample Stream...................................................................................................... 13

Section 4 Operation .............................................................................................................................................. 15

4.1 Using the sc Controller...................................................................................................................................... 15

4.2 Sensor Setup ................................................................................................................................................... 15

4.3 Sensor Data Logging ........................................................................................................................................ 15

4.4 Sensor Status Menu.......................................................................................................................................... 15

4.5 Sensor Setup Menu ......................................................................................................................................... 15

4.6 Pressure and Elevation ..................................................................................................................................... 17

4.7 Calibration......................................................................................................................................................... 18

4.7.1 Preparing a Conductivity Reference Solution.......................................................................................... 18

4.7.2 Zero Cal................................................................................................................................................... 19

4.7.3 Sample Cal .............................................................................................................................................. 19

4.7.4 Cond Cal.................................................................................................................................................. 20

4.7.5 Concurrent Calibration of Two Sensors ................................................................................................... 20

4.8 Temperature Compensation.............................................................................................................................. 21

4.8.1 Entering Values into the Temperature Compensation Table.................................................................... 21

4.8.2 Entering Values into the Configuring Concentration Table ...................................................................... 21

4.8.3 Entering Values into the Configuring TDS Table ..................................................................................... 22

Section 5 Maintenance ......................................................................................................................................... 23

5.1 Maintenance Schedule ..................................................................................................................................... 23

5.2 Cleaning the Sensor ......................................................................................................................................... 23

Section 6 Troubleshooting ................................................................................................................................... 25

6.1 Error Codes....................................................................................................................................................... 25

6.2 Warnings........................................................................................................................................................... 25

Section 7 Replacement Parts and Accessories ................................................................................................. 27

7.1 Replacement Items, Accessories, and Reagent and Standards....................................................................... 27

Section 8 Warranty, liability and complaints ...................................................................................................... 29

8.1 Compliance Information .................................................................................................................................... 30

Table of Contents

Section 9 Contact ................................................................................................................................................31

Appendix A Modbus Register Information ......................................................................................................32

Section 1 Specifications

Specifications are subject to change without notice.

Table 1 Inductive Conductivity Probe Specifications

Components Corrosion-resistant materials, fully-immersible probe with 6 m (20 ft) cable

Conductivity Measuring Range 0.0 to 200.0; 0 to 2,000,000 microSiemens/cm

Measuring Range (Temperature) –10 to 200.0 °C (–14 to 392 °F) limited by sensor body material

Probe Operating Temperature

Pressure/Temperature Limits (in pure water only)

Maximum Flow Rate 3 m (10 ft) per second

Temperature Compensator PT 1000 RTD

Sensor Cable

Probe Dimensions See Figure 1 and Figure 2 on page 8.

–10 to 200 °C (–14 to 392 °F); limited only by sensor body material and mounting hardware

Polypropylene: 6.9 bar at 100 °C (100 psi at 212 °F) PVDF: 6.9 bar at 120 °C (100 psi at 248 °F) PEEK (200 psi at 392 °F)

Polyproplyene and PVDF sensors: 5-conductor (plus two isolated shields) with XLPE (cross-linked polyethylene) jacket; rated to 150 °C (302 °F; 20 ft (6 m) long PEEK PFA Teflon rated to 200 °C (392 °F); 6 m (20 ft) long.

®1

: 13.8 bar at 200 °C (200 psi at 392 °F) PFA Teflon®2: 13.8 bar at 200 °C

sensors: 5-conductor (plus two isolated shields) with Teflon®-coated jacket;

and

PEEK® is a registered trademark of ICI Americas, Inc.

Te f lo n® is a registered trademark of Dupont Co.

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.)

Specifications

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 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. 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 all electrical products (marked or unmarked) which are supplied or produced by Hach-Lange, please contact the local Hach-Lange sales office for instructions for proper disposal.

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.

Figure 1 Sanitary-style Sensor

Figure 2 Convertible-style Sensor

2.3 The Digital Gateway

The Digital Gateway was developed to provide a means to use existing analog sensors with the new digital controllers. The gateway contains all the necessary software and hardware to interface with the controller and output a digital signal.

2.4 Theory of Operation

Inductive conductivity measurements are made by passing an AC current through a toroidal drive coil which induces a current in the electrolyte solution. This induced solution current produces a current in a second toroidal coil. The amount of current induced in the second coil is proportional to the solution conductivity.

The major advantage of toroidal conductivity is that the coils are not in contact with the solution. Because the coils are isolated from the solution, oils and other contaminants in moderate amounts do not interfere with the measurement. In addition, the coil housing can be chosen to withstand corrosive environments which would quickly corrode traditional sensors with metal electrodes.

Section 3 Installation

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

The 3700sc Digital Conductivity Sensor can be used with any sc controller. Refer to the controller manual for installation instructions.

The sc sensor should be wired to the digital gateway before connecting it to the sc controller. The digital gateway is designed 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 Explosion hazard. Do not connect or disconnect equipment unless power has been switched off or the area is known to be non-hazardous.

1. Route the cable from the sensor through the strain relief in the digital gateway then properly terminate the wire ends (see Figure 3).

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 3.

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.

Installation

Figure 3 Wiring and Assembling the Digital Gateway

1. Digital gateway front 7. Nut, strain relief

2. O-ring 8. From sensor

3. Sensor wire connector 9. Insert wires into the 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

Sensor (wire color) Sensor Signal Digital Gateway Sensor Wire connector

Red Temp + 1

Yellow Temp – 2

Shield (grey) Shield 3

Green Sense 4

White Drive + 5

Blue Drive – 6

+ 26 hidden pages