Hach-Lange SI794 C User Manual

DOC023.52.90117

si794 C

Contacting Conductivity

4-Wire Transmitters

USER MANUAL

October 2008, Edition 1

Return of products under warranty

Please contact our Service Team before returning a defective device. Ship the cleaned device to the address you have been given. If the device has been in contact with process fluids, it must be decontaminated/ disinfected before shipment. In that case, please attach a corresponding certificate, for the health and safety of our service personnel.

Disposal

Please observe the applicable local or national regulations concerning the disposal of “waste electrical and electronic equipment”.

Intended use ...........................................5

Safety information ......................................6

Overview of si794 C ....................................11

Assembly..............................................12

Package contents........................................12

Mounting plan ..........................................13

Pipe mounting, panel mounting .........................14

Installation and connection.............................16

Installation instructions ..................................16

Terminal assignments....................................16

Wiring examples.........................................18

Protective wiring of relay outputs ........................20

Interface and navigation .................................22

User interface ...........................................22

Display ..................................................23

Operation: Keypad.....................................24

Safety functions .......................................25

Sensocheck, Sensoface sensor monitoring ...............25

GainCheck device self-test ...............................25

Automatic device self-test ...............................25

Hold mode .............................................26

External activation of HOLD mode .......................27

Overview of configuration steps ........................30

Output 1 ................................................32

Output 2 ................................................46

Temperature compensation..............................52

Alarm settings ...........................................54

Limit function ...........................................56

Controller ...............................................60

Setting of relays for USP function ........................62

Control of rinsing probe / Signaling parameter set .......64

Selecting parameter set 1/2 ..............................66

External switchover of parameter sets ....................67

Parameter set, individual settings (original for copy) . . . . . . 70

Calibration by entry of cell constant ....................74

Calibration with calibration solution......................76

Product calibration ......................................78

Temp probe adjustment .................................80

Diagnostics functions ..................................81

Display of output currents ...............................81

Display of calibration data (Cal Info)......................81

Sensor monitor ..........................................81

Display of last error message .............................81

Specify output current (current source)...................82

Relay test (manual test of contacts) ......................82

Controller test (manual specification of controller output) 83

Controller functions....................................84

PID controller............................................84

Pulse length / pulse frequency controller.................86

Error messages (error codes)................................88

Operating states.........................................90

Sensoface ...............................................92

USP function ............................................94

Specifications ......................................... 98

Calibration solutions....................................104

Concentration curves ...................................106

Glossary ................................................111

Contact information ....................................112

Limited warranty .......................................114

Index...................................................116

Passcodes ..............................................120

Intended use

The si794 C transmitter is used for measurement of electrical conductivity and temperature in liquids. Fields of application are: biotechnology, chemical industry, environment, food processing, water/waste-water treatment.

The sturdy molded enclosure can be attached to a panel, wall, post or pipe railing. The optional hood provides protection against direct weather exposure and mechanical damage. The transmitter has been designed for application with 2- and 4-electrode sensors. It provides a second current output for temperature measurement, a PID controller (making use of the relay contacts), and a universal power supply for 24 ... 230 V AC/DC. For CIP applications, you can switch between two parameter sets.

Safety information

Be sure to read and observe the following!

The device has been manufactured using state of the art technology and it complies with applicable safety regulations. When operating the device, certain conditions may nevertheless lead to danger for the operator or damage to the equipment. Therefore, please read this entire manual before unpacking, setting up, or operating this equipment. Pay particular attention to all danger and caution statements.

Precautionary labels

Read all labels and tags attached to the instrument. Personal injury or damage to the instrument could occur if not observed. A symbol, if noted on the instrument, will be included with a danger or caution statement in the manual.

This symbol, if noted on the device, 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 electric shock and/or electrocution exists.

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

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 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, when noted on the product, identifies the presence of a noxious substance and a risk of chemical harm. 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, when noted on the product, indicates the presence of devices sensitive to electrostatic discharge (ESD) and indicates that care must be taken to prevent damage with the equipment.

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:

You can obtain instructions on the correct disposal of all (marked and unmarked) electrical products that have been supplied or manufactured by HachLange from your local Hach-Lange sales office.

Signal words for hazard information

This manual uses signal words to mark safety information. They are used alone or in combination with a safety symbol. 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 situa-

tion that may result in minor or moderate injury.

Important Note Information that requires special

emphasis.

Note Information that supplements points in

the main text.

General safety information

Do not use or install the si794 transmitter in any manner other than that which is specified in this manual.

Important Note

Commissioning must only be carried out by trained personnel. Whenever it is likely that protection has been impaired, the device shall be made inoperative and secured against unintended operation. The safety of the transmitter may be impaired if any of the following conditions have occurred:

visible damage• failure to operate properly• storage above 70 °C for prolonged periods• exposure to severe transport stresses•

If any of these conditions have occurred, return the device to the manufacturer for recertification.

Note

Before commissioning it must be proved that the transmitter may be connected with other equipment.

Important Note

Working with chemical samples, standards, reagents, and waste presents potential hazards. The device must only be operated by trained personnel authorized by the operating company. The manufacturer is not liable for any damages caused by processrelated risks known to the operating company.

Information on how to prevent electrostatic discharges (ESD)

Important Note

The sensitive electronic components in the device can be damaged by static electricity. This can impair device performance and even lead to a complete failure of the device. Before connecting a sensor, for example, you should discharge any static electricity buildup from your body. To do so, you can touch an earth-grounded metal surface such as the chassis of a device or a metal conduit or pipe.

Overview of si794 C

cond I hi

cond U hi

cond U lo

cond I lo

SG (Solution Ground)

shield

RTD

hold

hold/ control

control

+ output 1

2/4 El cond input

Output 1

Output 2

- output 1/2

+ output 2

relay 1

relay 1/2

relay 2

Temp input

Alarm

alarm

clean / PSet 2

Clean PSet2

HOLD

input

Control

input

Power

clean / PSet2

power

Assembly

76 5

Package contents

Check the shipment for transport damage and completeness. The package should contain:

• Front unit

• Rear unit

• Bag containing small parts

• User manual

• Specific test report

1 Jumper (2 x) 2 Washer (1 x), for conduit

mounting: Place washer between

enclosure and nut 3 Cable tie (3 x) 4 Hinge pin (1 x), insertable from

either side 5 Enclosure screw (4 x)

Fig.: Assembling the enclosure

6 Sealing insert (1 x) 7 Rubber reducer (1 x) 8 Strain relief (3 x) 9 Filler plug (3 x) 10 Hex nut (5 x) 11 Sealing plug (2 x),

for sealing in case of wall mounting

Mounting plan

144

105

6,2

Fig.: Mounting plan – All dimensions in mm!

1 Strain relief (3 x) 2 Strain relief or 1/2“ conduit

opening, ø 21.5 mm (2 x) Conduit hardware not included! 3 Knockout for pipe mounting (4 x ) 4 Knockout for wall mounting (2 x )

40 60

132

3 4

132165

173

Pipe mounting, panel mounting

1 Protective hood (LZY485) - if required

2 Hose clamp with worm gear drive to DIN 3017 (2 x) 3 Pipe-mount plate (1 x) 4 For vertical or horizontal posts or pipes 5 Self-tapping screw (4 x)

Fig.: Bracket kit (LZY483) – All dimensions in mm!

Fig.: LZY485 protective hood for wall and pipe mounting

– All dimensions in mm!

max. 25

78 27

1...22

1 Screw (4 x) 2 Gasket (1 x) 3 Control panel 4 Span piece (4 x) 5 Threaded sleeve (4 x)

Fig.: Panel mounting kit (LZY484) – All dimensions in mm!

Installation and connection

Installation instructions

Caution!

Any work on the electrical installation may only be undertaken by experienced and qualified personnel in accordance with the applicable local safety regulations.

• Always disconnect power to the device when making any electrical

connections!

• Be sure to follow the instructions in the user manual!

• Only connect the power supply when all internal wirings have been

completed and the system is correctly grounded! When using an external voltage supply, always connect a ground-fault circuit interrupter (tripping current max. 30 mA) between mains and controller system! A ground-fault circuit interrupter is not required when safety extra-low voltages (24 V DC supply via rechargeable batteries or 24 V DC/AC supply through an isolation transformer)! When operating the system outdoors, connect a surge voltage protection between mains and controller system! The terminals are suitable for single wires and flexible leads up to

2.5 mm² (AWG 14). Attach end ferrules to the leads.

Terminal Assignments

Danger of electric shock!

Fig.: si794 C terminal assignments

1 Terminals for temperature probe and outer shield 2 Terminals for sensor 3 Terminals for power supply

Fig.: Information on installation, rear side of device

Wiring examples

Cond measurement using 4-electrode sensor (Siemens Series 2100)

si794 C

shield

Black

Pink

RTD

Gray

Brown

I hi

V hi

V lo

I lo

Yellow

Green

White

SG*

Caution!

Place jumper across terminals 4 and 5!

*) When using a sensor with Solution Ground connection (SG) or

a separate SG connection, the jumper is not required!

Cond measurement with 2-electrode sensor

(Polymetron Series 831x, HACH 3400. Siemens LZY082)

si794 C

I hi

V hi

V lo

I lo

Jumper

Terminal

(Jumper to 1)

(Jumper to 4, 5)

C Shield:

D RTD Blue Blue Pink E RTD White Black Gray

Jumper

Color

Assignment

Inner electrode Black White/Yellow Transparent

Outer electrode Red Red White

Do not connect to earth ground!

HACH 3400 Series

Transparent White/Orange

831x Series Siemens

shield

LZY082

(shield)

RTD

Protective wiring of relay outputs

Protective wiring of relay contacts

Relay contacts are subject to electrical erosion. Especially with inductive and capacitive loads, the service life of the contacts will be reduced. For suppression of sparks and arcing, components such as RC combinations, nonlinear resistors, series resistors, and diodes should be used.

Typical AC applications with inductive load

1 Load 2 RC combination, e.g. RIFA PMR 209 Typical RC combinations for 230 V AC: Capacitor 0.1µF / 630V, Resistor 100 ohms / 1 W 3 Contact

Typical protective wiring measures

A: DC application with inductive load B: AC/DC applications with capacitive load C: Connection of incandescent lamps

A1 Inductive load A2 Free-wheeling diode, e.g. 1N4007 (Observe polarity) A3 Contact

B1 Capacitive load B2 Resistor, e.g. 8 Ω / 1 W at 24 V / 0.3 A B3 Contact

C1 Incandescent lamp, max 60 W / 230 V, 30 W / 115 V C3 Contact

Warning! Make sure that the maximum ratings of the relay contacts are not exceeded even during switching!

Interface and navigation

The si794 transmitter user interface contains a display, indicators, and keys for navigation and menu selection.

User interface

Use the arrow and enter keys to scroll through the menu and change settings. Use the indicators to identify which mode the transmitter is in.

Fig.: si794 user interface

1 Calibration key 7 Wash mode indicator

2 Congure key 8 Conguration mode indicator

3 Measure mode indicator 9 Up arrow key

4 Calibration mode indicator 10 Right arrow key

5 Alarm indication

6 Display

11 Enter key

Display

Interface and navigation

4.3 Display

Figure 11 identifies all of the possible icons and symbols that may be

seen in the si792 transmitter display.

The gure below identies all of the possible icons and symbols that may be seen in the si794 transmitter display.

Fig.: si794 display

1 Passcode 13 Secondary display 2 Temperature 14 Alarm mode 3 4–20 mA/HART output 15 Manual temperature on 4 Limit values 16 Calibration mode 5 Alarm 17 Hold mode active 6 Sensocheck: Sensor error 18 Hourglass (waiting indication) 7 Calibration active 19 Measure mode active 8 Calibration interval 20 Calibration complete

8 Parameter display 21 Calibration: zero or rst point 10 Enter prompt 22 Calibration: second point 11 Conguration mode 12 Main display

23 Sensofaces

Operation: Keypad

Start, end calibration

Start, end configuration

Select digit position (selected position blinks)

Edit digit

• Calibration:

Continue in program sequence

• Configuration: Confirm entries,

next configuration step

• Measuring mode: Display output current

Cal Info, display of calibration data

Error Info: Display of last error message

Start GainCheck device self-test

Safety functions

Sensocheck, Sensoface sensor monitoring

Sensocheck continuously monitors the sensor and its wiring. Sensocheck can be switched o (Conguration).

Sensoface provides information on the conductivity sensor condition. Significant sensor polarization effects or an excessive cable capacitance are indicated. The three Sensoface indicators provide information on the sensor condition.

GainCheck device self-test

A display test is carried out, the software version is displayed, and the memory and signal transfer are checked.

Start GainCheck device self-test:

Automatic device self-test

The automatic device self-test checks the memory and signal transfer. It runs automatically in the background at xed intervals.

Safety functions

Hold mode

Display:

The Hold mode is a safety state during conguration and calibration. Output current is frozen (Last) or set to a xed value (Fix). Alarm and limit contacts are disabled. If the calibration or conguration mode is exited, the transmitter remains in the Hold mode for safety reasons. This prevents undesirable reactions of the connected peripherals due to incorrect conguration or calibration. The measured value and “HOLD” are displayed alternately. The transmitter only returns to measuring mode after enter is pressed and 20 seconds have passed.

Conguration mode is also exited automatically 20 minutes (timeout) after the last keystroke. The transmitter returns to measuring mode.

Timeout is not active during calibration.

Response of output signal: Last: The output current is frozen at its last value.

Recommended for short conguration procedures. The process should not change decisively during conguration. Changes are not noticed with this setting!

Fix: The output current is set to a value that is noticeably

dierent from the process value in order to signal the control system that the transmitter is being worked at.

External activation of HOLD mode

The Hold mode can be activated from outside by sending a signal to the Hold input (e.g. from the process control system).

Power supply

Hold

12...24 V AC/DC

input

si794

Process control system

Hold active Hold inactive 10 ... 30 V AC/DC 0 ... 2 V AC/DC

Alarm

The alarm delay is congurable. During an error message the alarm LED blinks or lights.

Error messages can also be signaled by a 22 mA output current. The alarm contact is activated by alarm or power failure, see also Pg 54.

The alarm LED on the front panel can be congured as follows HOLD o: Alarm: LED blinks HOLD on: Alarm: LED on. HOLD: LED blinks

Configuration

In the Configuration mode you set the device parameters. The device can store two different parameter sets and switch between them. Sensor data and “Clean/Pset2” output are edited in parameter set 1 only. They are valid for both parameter sets.

Configuring

Parameter set 1

Configure:

Press conf.

Enter mode code “1200”: Edit parameter set 1 with and , confirm/proceed with enter.

Parameter set 2

Configure: “88” appears in the display.

Enter mode code “1288”: Edit parameter set 2 with firm/proceed with enter.

and , con-

The output current is frozen

Hold

During configuration the device remains in the Hold mode.

Input errors

HOLD icon

(at its last value or at a preset fixed value, depending on the configuration), limit and alarm contacts are inactive. The controller is in the configured state, Sensoface is off, mode indicator “Configuration” is on.

The configuration parameters are checked during the input. In the case of an incorrect input “Err” is displayed for approx. 3 s. The incorrect parameters cannot be stored. Input must be repeated.

End End with conf. The measured value

and Hold are displayed alternately, “enter” flashes. End Hold mode with enter . The display shows the measured value. The output current remains frozen for another 20 s (HOLD icon on, “hourglass” flashes).

Menu structure of conguration

The conguration steps are assigned to dierent menu groups. Use the arrow keys to jump between the individual menu groups. Each menu group contains menu items for setting the parameters. Press enter to access a menu item. Use the arrow keys to edit values. Press enter to conrm/save the settings. To return to measurement, press conf and then enter.

Select menu group

Menu group Code Display

Output 1 o1.

Menu item 1

Menu item 2

Menu item ...

Output 2 o2.

Temperature compensation

Alarm settings AL.

Relay rL.

Cleaning contact PSet 2 selection

tc.

Cn.

...

Select menu item

Previous menu group:

Overview of configuration steps

Code

Output 1

out1

Sensor selection *

o1.

Select process variable

Select solution (Conc), see Pg 106 Codes:

Select current range Characteristic (not for SAL, Conc, USP)

LIN:

Enter current start Enter current end

LOG:

Enter current start

Enter current end Time averaging filter 22 mA signal for error messages Signal response during HOLD

Output 2

out2

o2.

Select temperature unit Select temperature probe* Select current range Enter current start Enter current end Time averaging filter 22 mA signal for temp error Signal response during HOLD

Temperature compensation

Temp compensation selection

tc.

Alarm settings

ALrt

AL.

Select Sensocheck Enter alarm delay LED in HOLD mode

Enter fixed value

Fix:

Enter fixed value

Fix:

Lin: Enter temperature coefficient

Selection / Default

2-electrode, 4-electrode

µS, mS/cm, MΩ·cm, SAL, Conc, USP

NaCl HCl NaOH H

-1- -2- -3- -4- -50-20 mA / 4-20 mA Linear / Logarithmic xxxx mS xxxx mS in decades: 0.001 ... 1000 in decades: 0.001 ... 1000 xxxx SEC ON / OFF Last / Fix xxx.x mA

°C / °F Pt100; Pt1000; NTC 8.55k; NTC 30k 0-20 mA / 4-20 mA xxx.x xxx.x xxxx SEC ON / OFF Last / Fix xxx.x mA

OFF / Lin / nLF / NaCl / HCl / NH xx.xx %/K

ON / OFF xxxx sec ON / OFF

2SO4

HNO

+ 94 hidden pages

Hach-Lange SI794 C User Manual

Table of contents

Intended use

Safety information

Overview of si794 C

Assembly

Installation and connection

Terminal Assignments

Wiring examples

Protective wiring of relay outputs

Interface and navigation

Operation: Keypad

Safety functions

Hold mode

Configuration