Hach-Lange SI794 P User Manual

DOC023.52.90115

si794 P

pH

4-Wire Transmitters

USER MANUAL

October 2008, Edition 1

© HACH LANGE GmbH, 2008. All rights reserved.
Printed in Germany

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”.

Table of contents

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

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

Overview of si794 P ............................................................... 11

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

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

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

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

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

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

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

pH 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

Configuration ......................................................................... 28

Menu structure of configuration ................................................... 29

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

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

Output 2 .................................................................................................40

Temperature compensation ............................................................ 46

Calibration mode ................................................................................ 48

3

Alarm settings ...................................................................................... 50

Limit function .......................................................................................52

Switchover of parameter sets (manual) ...................................... 60

External switchover of parameter sets ........................................ 61

Default settings of parameter sets ...............................................63

Parameter set, individual settings ................................................. 64

Calibration ............................................................................. 66

pH calibration ....................................................................................... 67

Automatic calibration with Calimatic ......................................... 70

Manual calibration ..............................................................................72

Data entry of premeasured electrodes ....................................... 74

Product calibration ............................................................................ 76

Redox calibration ................................................................................78

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

Measurement .........................................................................80

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

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

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

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

Error messages (error codes) ................................................87

Calibration error messages ..............................................................89

Operating states .................................................................... 91

Sensoface ...............................................................................93

Appendix ................................................................................95

Product line and accessories........................................................... 95

Specifications ........................................................................................ 96

Buffer tables ........................................................................................102

Glossary ................................................................................110

Contact information ............................................................114

Limited warranty .................................................................116

Index .....................................................................................119

4

Intended use

The si794 P transmitter is used for pH/mV, ORP, and temperature
measurement in industry, environment, food processing, and
sewage 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 can easily be replaced and it accepts commercially
available electrodes with a nominal zero point at pH 7 and ISFET
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.

5

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).

6

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.

7

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 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.

8

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.

9

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.

10

Overview of si794 P

Glass
electrode

Reference
electrode

Auxiliary
electrode

RTD

RTD

Shield

ISFET
+3V

ISFET

-3V

HOLD

HOLD/
CONTROL

CONTROL

1

pH / mV /
temp
input

2

3

E

Output 1

Output 2

R1

D

R2

9

10

11

12

13

14

+ Output 1

– Output 1/2

+ Output 2

Relay 1

Relay 1/2

Relay 2

C

± 3 V

4

for ISFET
sensor

Alarm

15

16

Alarm

Alarm

5

Clean / PSet 2

Clean

HOLD

6

input

7

Control

8

input

Power

17

18

19

20

Clean / PSet 2

Power

Power

11

Assembly

11

10

9

8

76 5

4

1

2

3

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

12

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

144

15

42

84

80

32

21

43

105

27

72

6,2

12

3

4

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 )

13

40 60

132

1

2

3
4

5

1

132165

173

1

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!

14

1

2

3

45

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!

15

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 P terminal assignments

16

4

3

1 ESD shield covering the signal inputs
(Screw off for assembly)

Note:

The cable shield must end under the ESD shield.
(Cut lines if required)

2 Terminals for temperature probe and outer shield
3 Terminals for electrode
4 Power supply connection

1

2

Fig.: Information on installation, rear side of device

17

pH wiring examples

Example 1:

pH measurement with
monitoring of glass electrode

Jumper
across
2 and 3

Cable shield –

Do not ground!

Color

Top 68

Assign-

ment

Jumper

cable

Coax
core

Coax
(shield)

Terminal

1 Glass

elec­trode

2 Ref.

elec­trode

(

3

2-3)

C Shield Green/

D RTD Red Green Red
E RTD White White White

SMEK
cable

Trans­parent
(coax
core)

Black
(coax
shield)

yellow

8350.0

Trans­parent
(coax
core)

Black
(coax
shield)

18

Example 2:

pH measurement with
monitoring of glass and
reference electrode

Terminal

Assign-

1 Glass

electrode

2 Reference

electrode
3 SG Blue
C Shield
D RTD Red
E RTD White

Cable shield –

Do not ground!

ment

Color

8350.3

8350.4

8350.5

Transparent
(coax core)

Black
(coax shield)

19

1

2

3

1

2

3

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

20

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!

21

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.

6

5

4

3

2

1

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

7

8

9

10

11

22

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

23

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 offset (zero point) and slope

Error Info: Display of last error message

24

+

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 electrode condi­tion. The oset (zero point), slope, and response time
during calibration are evaluated. The three Sensoface
indicators provide the user with information about wear
and required maintenance of the electrode.

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.

+

25

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.

26

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

6

input

si794

7

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 50.

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

27

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).

28

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

Calibration mode CA.

Alarm settings AL.

Relay rL.

Cleaning contact
PSet 2 selection

tc.

Cn.

...

Select
menu item

Previous
menu
group:

29

Overview of conguration steps

Code

Menu

Output 1

out1

o1.

Select process variable
Select electrode type

Select current range
Enter current start

Enter current end

Time averaging filter

22 mA signal in the case of error

Signal response during HOLD

Enter fixed value

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

Enter fixed value

Temperature compensation

tc.

tc.

Temp detection during meas
Temp detection during cal
Enter TC process medium

Calibration mode

CAL

CA.

Select calibration mode

Enter cal timer interval

during HOLD

Choices Default

PH/ORP PH
(GLAS EL/FEt EL ) GLAS EL
0-20 mA/4-20 mA 4-20 mA
xxxx 00.00 pH
xxxx 14.00 pH
xxxx SEC 0 SEC
ON / OFF OFF
Last / Fix Last
xxx.x mA 021.0 mA

°C / °F °C
100 Pt/1000 Pt/30NTC/

8.55NTC/3000B 1000 Pt
0-20 mA/4-20 mA 4-20 mA
xxx.x 000.0 °C
xxx.x 0100.0 °C
0000 ... 0120 SEC) 0 SEC
ON / OFF OFF
Last / Fix Last
xxx.x mA 021.0 mA

Auto/man (man: xxx.x °C)
Auto/man (man: xxx.x °C)
xx.xx %/K 00.00%/K

BUF/MAN/DAT 06 BUF
xxxx h 0000 h

30

Code

Menu

Alarm settings

ALrt

AL.

Select Sensocheck

Enter alarm delay

LED in HOLD mode

Relay 1/2: Limit values, controller

rL AY

rL.

Select limit function / controller

Select contact function

L1.

Select contact response
Enter setpoint
Enter hysteresis
Enter delay
Select contact function

L2.

Select contact response

Enter setpoint

Enter hysteresis
Enter delay

Enter controller setpoint

Ct.

Enter neutral zone

(P) Controller gain K

(I) Reset time T

(D) Rate time T

Pulse length/frequency controller

PLC: Pulse length
PFC: Pulse frequency

Select HOLD response

Cleaning contact

Cln.

Cn.

Select cleaning contact or signaling
of parameter set 2

Cleaning interval

rinse

Cleaning duration
Select contact response

Choices Default

ON / OFF OFF
xxxx sec 0010 sec
ON / OFF OFF

LiMIT / CtROL LiMIT
Lo / Hi Lo
N/O / N/C N/O
xxxx 00.00 pH
xxxx 00.50 pH
xxxx SEC 0010 SEC

Lo / Hi Hi

N/O / N/C N/O
xxxx
xxxx 00.50 pH
xxxx SEC 0010 sec
xxxx 07.00 pH
xxxx 01.00 pH
xxxx % 0100 %

P

R

D

xxxx SEC 0000 SEC
xxxx SEC 0000 SEC

PLC / PFC PLC
xxxx SEC 0010 SEC
xxxx /min 0060 /min
Y Last / Y Off Y Last

rinse / Pset2 rinse

xxx.x h 000.0 h
xxxx SEC 0060 SEC
N/O / N/C N/O

14.00 pH

31

Conguration

Output 1
Select type of electrode / Measurement procedure

Menu group

Output 1

Code

o1.

Display

Select menu item

Select process variable

Select electrode type

Select 0-20 / 4-20 mA

Enter current start

Enter current end

Set output filter

22 mA for error

HOLD mode

Exit:
Press conf, then enter.

32

Code Display

o1.

After correct input a
welcome text (CONF) is
displayed for approx. 3 sec

Action

Select configuration
(Press conf.)

Enter passcode “1200”
(Use  to select the position, use
 to edit the number. When the
display reads “1200”, press enter
to confirm.)

The transmitter goes to HOLD
mode. (HOLD icon is active, red
LED blinks when “HOLD ON” has
been configured.)

Choices

Select parameter pH/ORP
Select using  key
Press enter to proceed

Only with pH selected:
Select electrode type:

• Glass electrode

• ISFET electrode

Select using  key
Press enter to proceed

Note: Characters represented in gray are blinking and can be edited.

pH/ORP

Glass

(FEt EL)

33

Conguration

Output 1
Output current range / Current start / Current end

Menu group

Output 1

Code

o1.

Display

Select menu item

Select process variable

Select electrode type

Select 0-20 / 4-20 mA

Enter current start

Enter current end

Set output filter

22 mA for error

HOLD mode

34

Exit:
Press conf, then enter.

Code

o1.

Display

Action

Set output current range
Select using  key
Press enter to proceed

Choices

4 - 20 mA

(0 - 20 mA)

Current start
Enter lower end of scale,
depending on the process
variable selected (pH or ORP)
Select using , edit number
using . Press enter to proceed.

Current end
Enter upper end of scale,
depending on the process
variable selected (pH or ORP)
Select using , edit number
using . Press enter to proceed.

Assignment of measured values:
Current start and current end

Example 1: Range pH 0 ... 14 Example 2: Range pH 5 ... 7 .

[pH]

14

0

Output current

20 4

Advantage: Higher resolution in

[mA]

range of interest

[pH]

7

5

Output current

pH -2 ... 16

(-1500 mV
...
+1500mV)

pH -2 ... 16

(-1500 mV
...
+1500mV)

20 4

[mA]

35

Conguration

Output 1
Time averaging lter

Menu group

Output 1

Code

o1.

Display

Select menu item

Select process variable

Select electrode type

Select 0-20 / 4-20 mA

Enter current start

Enter current end

Set output filter

22 mA for error

HOLD mode

Exit:
Press conf, then enter.

36

Display Action

Code

o1.

Time interval of output filter
Default setting: 0 sec (inactive).
To specify a time interval:
Select position using ,
edit number using .
Press enter to proceed.

Choices

0 sec

0...120 sec

Time averaging filter

To smoothen the current output, a low-pass filter with adjustable
filter time can be switched on. When there is a jump at the input
(100 %), the output level is at 63 % after the time interval has been
reached.
The time interval can be set from 0 to 120 sec.
If the time interval is set to 0 sec, the current output follows the
input.

Note:

The filter only acts on the current output, not on the display, the
limit values, or the controller!

Time interval 0 to 120 sec

37

Conguration

Output 1
Output current during Error and HOLD

Menu group

Output 1

Code

o1.

Display

Select menu item

Select process variable

Select electrode type

Select 0-20 / 4-20 mA

Enter current start

Enter current end

Set output filter

22 mA for error

HOLD mode

Exit:
Press conf, then enter.

38

Code

o1.

Display

Action

22 mA signal for error message
Select using  key
Press enter to proceed

Choices

OFF

(ON)

Output signal during HOLD
LAST: During HOLD the last
measured value is maintained at
the output
FIX: During HOLD a value (to be
entered) is maintained at the
output
Select using  key
Press enter to proceed

Only with FIX selected:
Enter current which is to flow at
the output during HOLD
Select position using key and
edit number using  key.
Press enter to proceed

Output signal during HOLD:

Output current
[mA]

21

4

Output signal for HOLD
FIX setting = 21.0 mA

HOLD active

LAST

(FIX)

21.0 mA

(00.0 ...

21.0 mA)

Output signal for HOLD
LAST setting

HOLD active

39

Conguration

Output 2
Temperature unit and probe / Output current

Menu group

Output 2

Code

o2.

Display

Select menu item

Select °C/°F

Select temperature probe

Select 0-20 / 4-20 mA

Enter current start

Enter current end

Set output filter

22 mA for temp error

HOLD mode

Exit:
Press conf, then enter.

40

Code

o2.

Display

Action

Specify temperature unit
Select using  key
Press enter to proceed

Select temperature probe
Select using  key
Press enter to proceed

Set output current range
Select using  key
Press enter to proceed

Choices

°C

(°F)

1000 PT

(100 PT,
30NTC,

8.55NTC,
3000B)

4 - 20 mA

(0 - 20 mA)

Current start:
Enter lower end of scale.
Select using , edit number
using. Press enter to proceed.

Current end:
Enter upper end of scale.
Select using , edit number
using. Press enter to proceed.

Process temperature: Current start and current end

Example 1: Range 0 ... 100 °C Example 2: Range 50 ... 70 °C

[°C]

Process temperature

100

0

Output current

20 4

Advantage: Higher resolution in

[mA]

range of interest

Process temperature

[°C]
70

50

000.0 °C

100.0 °C

Output current

20 4

[mA]

41

Conguration

Output 2
Time averaging lter

Menu group

Output 2

Code

o2.

Display

Select menu item

Select °C/°F

Select temperature probe

Select 0-20 / 4-20 mA

Enter current start

Enter current end

Set output filter

22 mA for temp error

HOLD mode

Exit:
Press conf, then enter.

42

Code

o2.

Display

Action

Time averaging filter
Default setting: 0 sec (inactive).
To specify a time constant: Select
using , edit number using.
Press enter to proceed.

Choices

0 sec

(0...120 sec)

Time averaging filter

To smoothen the current output 2, a low-pass filter with adjustable
filter time can be switched on. When there is a jump at the input
(100 %), the output level is at 63 % after the time interval has been
reached.
The time interval can be set from 0 to 120 sec.
If the time interval is set to 0 sec, the current output follows the
input.

Note:

The filter only acts on the current output, not on the display, the
limit values, or the controller!

Time interval 0 to 120 sec

43

Conguration

Output 2
Temperature error / Output current during HOLD

Menu group

Output 2

Code

o2.

Display

Select menu item

Select °C/°F

Select temperature probe

Select 0-20 / 4-20 mA

Enter current start

Enter current end

Set output filter

22 mA for temp error

HOLD mode

Exit:
Press conf, then enter.

44

Code

o2.

Display

Action

22 mA signal for error message
Select using  key
Press enter to proceed

Choices

OFF

(ON)

Output signal during HOLD
LAST: During HOLD the last
measured value is maintained at
the output
FIX: During HOLD a value (to be
entered) is maintained at the
output
Select using  key
Press enter to proceed

Only with FIX selected:
Enter current which is to flow at
the output during HOLD
Select position using key and
edit number using  key.
Press enter to proceed

Output signal during HOLD:

Output current
[mA]

21

4

Output signal for HOLD
FIX setting = 21.0 mA

HOLD active

LAST

(FIX)

21.0 mA

(00.0 ...

21.0 mA)

Output signal for HOLD
LAST setting

HOLD active

45

Conguration

Temperature compensation
Temp detection for meas/cal / TC process medium

Menu group

Temperature
compensation

Code

tc.

Display

Select menu item

Temp during meas.

Temp during calibration

TC of process medium

46

Exit:
Press conf, then enter.

Code

tc.

Display

Action

Select temp detection during
measurement (Auto/MAN)
AUTO: Temp detection with
temperature probe
MAN: Manual temperature input
Select using key,
press enter to proceed

Choices

AUT

(MAN)

Only with manual temp detection
selected (MAN)
Enter temperature.
Select position using  key,
edit number using  key.
Press enter to proceed

Select temp detection during
calibration (Auto/MAN)
Select using key,
press enter to proceed

Only with manual temp detection
selected (MAN)
Enter temperature.
Select position using  key,
edit number using  key.
Press enter to proceed

For pH measurement only:
Enter temperature compensation
of process medium
Select position using  key,
edit number using  key.
Press enter to proceed

25.0 °C

(xxx.x °C)

AUT

(MAN)

25.0 °C

(xxx.x °C)

00.00 %/K

(-19.99 ...

19.99 %/K)

47

Conguration

Calibration mode

Menu group

Calibration mode

Code

CA.

Display

Select menu item

Calibration mode

Cal timer interval

Exit:
Press conf, then enter.

48

Code

CA.

Display

Action

For pH measurement only:
Select calibration mode
BUF: Calibration with Calimatic
automatic buffer selection.
To do so, you must select your
buffer set:

-01- BUF: Mettler-Toledo

-02-BUF: Merck Titrisols, Riedel Fixanals

-03- BUF: Ciba (94)

-04-BUF: NIST technical buffers

-05-BUF: NIST standard buffers

-06-BUF: HACH buffers

-07-BUF: WTW technical buffers

-08- BUF: Hamilton Duracal

MAN: Calibration with
Manual Buffer Entry

DAT: Entry of offset and slope of
premeasured electrodes
Select using key,
proceed.

press enter to

Choices

-01-BUF
(-02-BUF/

-03-BUF/

-04-BUF/

-05-BUF/

-06-BUF/

-07-BUF/

-08-BUF/
MAN/
DAT )

Enter calibration interval:
Entry of time interval within
which the transmitter is to be
calibrated.
With a time interval of 0000 hrs
the calibration timer is not active.
Select using , edit number
using.

Press enter to proceed.

0000 h

(0000 ...
9999 h)

49

Conguration

Alarm settings

Menu group

Alarm settings

Alarm

Code

AL.

Display

Select menu item

Select Sensocheck

Delay

LED in HOLD mode

Exit:
Press conf, then enter.

Alarm contact

15

The alarm contact is closed during normal operation (N/C).
It opens in the case of alarm or power outage. As a result,

16

a failure message is provided even in the case of line
breakage (fail-safe behavior). For contact ratings, see
Specifications.

Error messages can also be signaled by a 22 mA output
current.

The operating behavior of the alarm contact is shown on
Pg 91.

The alarm delay acts on the LED, the 22 mA signal, and
the alarm contact.

50

Code

Display

Action

Choices

AL.

Select Sensocheck
(continuous monitoring of glass
and reference electrode)
Select using

press enter to proceed.

Alarm delay

Select using, edit number
using

LED in Hold mode

Select using  key,

press enter to proceed.

LED state:

Setting

ON

OFF





key,

. Press

enter to proceed.

Alarm HOLD

on blinks

blinks off

ON/OFF

0010 sec

(xxxx sec)

ON/OFF

51

Conguration

Limit function
Relay 1

Menu group

Relay / Controller

Code

rL.

Display

Select menu item

Contact function

L1.

Contact response

Enter setpoint

Enter hysteresis

Delay

L2.

Relay 2 menu group
Controller menu group

Ct.

Exit:
Press conf, then enter.

52

Code

rL.

Display

Action

Use of relays:

• Limit function (LiMIT )

• Controller (CtROL)

Select using

Press enter to proceed.

Note: Selecting CtROL leads to
Ct. controller menu group.

.

Choices

LiMIT

(CtROL)

L1.

For limit 1 function principle,
see page 55. Select using

Press enter to proceed.

Limit 1 contact response
N/C: normally closed contact
N/O: normally open contact

Select using .

Press enter to proceed

Limit 1 setpoint

Select using , edit number

. Press enter to proceed.

using

Limit 1 hysteresis

Select using , edit number

. Press enter to proceed.

using

Limit 1 delay

The contact is activated with
delay (deactivated without delay)
Select using
using



, edit number

. Press enter to proceed.

.

Lo

(Hi)

N/C
(N/O)

00.00 pH

(

xx.xx pH)

00.50 pH

(

xx.xx pH)

0010 sec

(

0 ... 9999

sec)

53

Configuration

Limit function
Relay 2

Menu group

Relay / Controller

Code

rL.

Display

Select menu item

Relay 1 menu group

L1.

Contact function

L2.

Contact response

Enter setpoint

Enter hysteresis

Delay

Controller menu group

Ct.

Exit:
Press conf, then enter.

54

Code

Display Action

Choices

L2.

Limit Lo

Hysteresis +

Setpoint

Contact

For limit 2 function principle,
see Fig. below. Select using

.

Hi

(Lo)

Press enter to proceed.

Limit 2 contact response
N/C: normally closed contact

N/C
(N/O)

N/O: normally open contact

Select using .

Press enter to proceed.

Limit 2 setpoint



Select using
using

, edit number

. Press enter to proceed.

Limit 2 hysteresis



Select using

. Press enter to proceed.

using

, edit number

Limit 2 delay

The contact is activated with
delay (deactivated without delay)



Select using
using

Signal

1

0

, edit number

. Press enter to proceed.

Limit Hi

Setpoint

Hysteresis -

1

Contact

0

14.00 pH

(

xx.xx pH)

00.50 pH

(

xx.xx %)

0010 sec

(

0 ...

9999 sec)

Signal

55

Conguration

Controller (For description see Pg 84 and the following)
Setpoint / Neutral zone

Menu group

Relay / Controller

Code

rL.

Display

Select menu item

Relay 1 menu group

L1.

Relay 2 menu group

L2.

Ct.

Controller setpoint

Enter neutral zone

(P) Controller gain

(I) Reset time TR

(D) Rate time TD

Pulse length / Pulse
frequency controller

PLC: Pulse length

PFC: Pulse frequency

HOLD response

Exit:
Press conf, then enter.

56

Code

Ct.

Display

Action

Setpoint

Select using , edit number

. Press enter to proceed.

using

Neutral zone (dead band)

Select using , edit number

. Press enter to proceed.

using

Controller: P action

Select using , edit number

. Press enter to proceed.

using

Choices

07.00 pH

(xx.xx pH)

01.00 pH

(xx.xx pH)

0100 %

(xxxx %)

Controller: I action (reset time)

Select using , edit number

. Press enter to proceed.

using

Controller: D action (rate time)

Select using , edit number

. Press enter to proceed.

using

Pulse length / Pulse frequency
Select using

Press enter to proceed.

PLC: Pulse length

Select using , edit number
using

PFC: Pulse frequency

Select using , edit number
using

Behavior during HOLD

Select using .

Press enter to proceed.



.

. Press enter to proceed.

. Press enter to proceed.

0000 sec

(xxxx sec)

0000 sec

(xxxx sec)

PLC

(PFC)

0010 sec

(xxxx sec)

0060/min

(xxxx /min)

Y Last

(Y Off)

57

Configuration

Controlling a rinsing probe or
Signaling parameter set 1/2

Menu group

Contact:
CLEAN / PSet2

Code

Display

Cn.

rinse

58

Code

Cn.

Display

Select menu item

Select CLEAN / PSet2

Rinsing interval

Rinse time

Contact response

Action (rinsing probe)

Function selection*:

• Control of rinsing probe (rinse)

Signaling active parameter set 2

•

Select using ,
proceed.

Rinsing interval *
Select using , edit number

, press enter to proceed.

using

Rinse duration *
Select using , edit number

, press enter to proceed.

using

Select contact response*
N/O: normally open contact
N/C: normally closed contact
Select using ,
proceed

*) These parameters are only edited in parameter set 1.

They are valid for both parameter sets.

press enter to

press enter to

Choices

rinse

(rinse /
PSet2)

For

PSet2
see next
page

000.0 h

(xxx.x h)

0060 sec
(xxxx sec)

N/O

(

N/O

N/C)

:

Controlling a rinsing probe

The “Clean” contact can be used to connect a simple rinsing probe.
Rinse duration and rinsing interval are defined during configuration.
Contact response can be set as N/O or N/C.

e.g. spray cleaning

Clean

17

18

Signaling parameter set 1/2

Depending on the selected parameter set, the relay is
active or inactive. The signal can be used for super­ordinated process control systems.
Parameter set 2 is indicated by “88” in the upper left
corner of the display.

Clean
PSet2

17

18

si794

Parameter set 1 selected

Parameter set 2 selected

Power supply

Power supply

Process control system

Power supply:
AC< 250 V / < 3 A / < 750 VA
DC< 30 V / < 3 A / < 90 W

59

Selecting parameter set 1/2

Manually or via a signal at the Control input

Display

After correct input a
welcome text (CONF) is
displayed for approx. 3 sec

Action Choices

To select a parameter set, press conf,
enter code: 7654
Select position using , edit number
using ,

Wrong settings change the measurement
properties! If an invalid code is entered, the
transmitter returns to measuring mode.

press enter to proceed.

Select:

• Parameter set 1 (MAN)

• Parameter set 2 (MAN)

• Automatic switchover via

control input (Ctr-EXT)

Select using ,

With -1- or -2- selected:
Since the complete device configura­tion is changed in one step, there is a
security prompt (No/Yes).

Note:
When pressing enter directly,
the selection is not stored.
Activation of parameter set 2 is
indicated by “88” in the upper left
corner of the display.

press enter to proceed.

-1-

(-1- MAN

-2-MAN
Ctr-EXT)

For Ctr-EXT,
see next
page

60

Display

Action Choices

With Control input
You can switch between the parameter
sets by applying an external signal to
the Control input (see below).

Ctr-EXT selected:

External switchover of parameter sets

The parameter set can be selected from outside by sending a
signal to the Control input (e.g. from the process control system).
To do so, Ctr-EXT is set during configuration.

Control

Power supply

7

input

si794

Note:

Parameter set 2 is indicated by “88” in the upper left corner of the
display.

8

Process control system

0 ... 2 V AC/DC Parameter set 1 selected

10 ... 30 V AC/DC Parameter set 2 selected

61

62

Default settings of parameter sets

Two complete parameter sets are stored in the EEPROM.
As delivered, the two sets are identical but can be edited.
Note:
Fill in your configuration data on the following pages.

Code. Parameter Default setting

o1. pH/ORP unit pH
o1. Electrode type GLASS
o1. 0/4-20 mA 4-20 mA
o1. Current start 00.00 pH
o1. Current end 14.00 pH
o1. Filter time 0 s
o1. 22mA signal OFF
o1. HOLD response Last
o1. Fix current 021.0 mA
o2. Unit °C / °F °C
o2. Temp probe 1000 PT
o2. 0/4 ...20mA 4-20 mA
o2. Current start 000.0 °C
o2. Current end 100.0 °C
o2. Filter time 0 s
o2. 22mA signal OFF
o2. HOLD response Last
o2. Fix current 021.0 mA
tc. TC measurement Auto
tc. Measuring temp 025.0 °C
tc. TC calibration Auto
tc. Calibration temp 025.0 °C
tc. TC medium 00.00 %/K
CA. Cal solution -06-BUF
CA. Cal interval 0000 h
AL. Sensocheck OFF
AL. Alarm delay 0010 sec
AL. LED Hold OFF

Code. Parameter Default setting

rL. Relay function Limit
L1. Contact function Lo
L1. Contact response N/C
L1. Setpoint 00.00 pH
L1. Hysteresis 00.50 pH
L1. Delay 0010 sec
L2. Contact function H i
L2. Contact response N/C
L2. Setpoint 14.00 pH
L2. Hysteresis 00.50 pH
L2. Delay 0010 sec
Ct. Setpoint 07.00 pH
Ct. Neutral zone 01.00 pH
Ct. P action 0100 %
Ct. I action 0000 sec
Ct. D action 0000 sec
Ct. PLC/PFC controller PLC
Ct. Pulse length 0010 sec
Ct. Pulse frequency 0060 /min
Ct. Hold response Last
Cn. Rinse/Par.set 2 Rinse
Cn. Rinsing interval 000.0 h
Cn. Rinse duration 0060 sec
Cn. Contact type N/C

63

Parameter set, individual settings

Code. Parameter Setting

o1. pH/ORP unit ____________ ____________
o1. Electrode type ____________ ____________
o1. 0/4-20 mA ____________ ____________
o1. Current start ____________ ____________
o1. Current end ____________ ____________
o1. Filter time ____________ ____________
o1. 22mA signal ____________ ____________
o1. HOLD response ____________ ____________
o1. Fix current ____________ ____________

o2. Unit °C / °F ____________ ____________
o2. Temp probe ____________ ____________
o2. 0/4 ...20mA ____________ ____________
o2. Current start ____________ ____________
o2. Current end ____________ ____________
o2. Filter time ____________ ____________
o2. 22mA signal ____________ ____________
o2. HOLD response ____________ ____________
o2. Fix current ____________ ____________

tc. TC measurement ____________ ____________
tc. Measuring temp ____________ ____________
tc. TC calibration ____________ ____________
tc. TC medium ____________ ____________

CA. Cal solution ____________ ____________
CA. Cal interval ____________ ____________

AL. Sensocheck ____________ ____________
AL. Alarm delay ____________ ____________
AL. LED Hold ____________ ____________

64

Code Parameter Setting

rL. Relay function ____________ ____________

L1. Contact function ____________ ____________
L1. Contact response ____________ ____________
L1. Setpoint ____________ ____________
L1. Hysteresis ____________ ____________
L1. Delay ____________ ____________

L2. Contact function ____________ ____________
L2. Contact response ____________ ____________
L2. Setpoint ____________ ____________
L2. Hysteresis ____________ ____________
L2. Delay ____________ ____________

Ct. Setpoint ____________ ____________
Ct. Neutral zone ____________ ____________
Ct. P action ____________ ____________
Ct. I action ____________ ____________
Ct. D action ____________ ____________
Ct. PLC/PFC controller ____________ ____________
Ct. Pulse length ____________ ____________
Ct. Pulse frequency ____________ ____________
Ct. Hold response ____________ ____________

Cn. Rinse /Par.set2 ____________ ____________
Cn. Rinsing interval ____________ ____________
Cn. Rinse duration ____________ ____________
Cn. Contact type ____________ ____________

65

Calibration

Calibration adjusts the transmitter to the electrode.

Activation Activate with cal

Enter passcode.
Use  and  to edit a
parameter.
Press enter to conrm/continue.
(To exit, press cal, then enter.)

HOLD

During cali­bration the
transmitter
remains in
the Hold
mode.

HOLD icon

Input errors

Exit

During calibration the transmit­ter remains in the Hold mode
for reasons of safety. Output
current is frozen (last value or
preset xed value, depending
on conguration), limit and
alarm contacts are inactive. The
controller is in the congured
state, Sensoface is o, “Calibra­tion” mode indicator is on. The
red LED blinks when “HOLD ON”
has been set.

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

Press cal to exit. The measured
value is shown in the main
display alternately with “Hold”,
“enter” blinks, Sensoface is
active. Press enter key to end
the Hold mode. The measured
value is displayed. The output
current remains frozen for
another 20 sec (HOLD icon on,
“hourglass” blinks).

66

pH calibration

Calibration is used to adapt the transmitter to the individual
electrode characteristics, namely oset and slope. Calibration
can be performed with Calimatic automatic buer recognition,
with manual buer input, by entering premeasured electrode
data, or by sampling the product.
When using ISFET sensors, you must adjust the zero point rst.
Then you can conduct either a one or a two-point calibration.
Caution

All calibration procedures must be performed by trained

•

personnel. Incorrectly set parameters may go unnoticed, but
change the measuring properties.

•

The response time of the electrode and temperature probe is

considerably reduced when the electrode is rst moved about
in the buer solution and then held still.

• The transmitter can only operate properly when the buer

solutions used correspond to the congured set. Other buf­fer solutions, even those with the same nominal values, may
demonstrate a dierent temperature response.
This leads to measurement errors.

When using ISFET sensors or electrodes with a zero point
other than pH 7, the nominal zero point must be adjusted each

time a new electrode is connected. This is important if you want
to obtain reliable Sensoface messages. The Sensoface messages
issued during all further calibrations are based on this basic
calibration.

67

Zero adjustment (ISFET)

Allows use of electrodes with diering nominal zero (pH only)

Display

Action

Press cal, enter code: 1001
Select position using ,
edit number using ,
press enter to proceed.

Ready for calibration
“CAL” and “enter” are blinking.

Immerse electrode in a
pH 7.00 buffer. Enter the
perature-corrected pH value in
the range 6.50 to 7.50 using the
arrow keys (see buffer table).
Press enter to confirm.

Stability check.
The measured value [mV] is
displayed.
The “hourglass” icon is blinking.

tem-

Remark

The transmitter is in
the Hold mode.
If an invalid code is
entered, the
transmitter returns
to measuring mode.

Display (3 sec)

If the zero offset of
the electrode is too
large (> ± 200 mV ),
the CAL ERR error
message is generat­ed. In that case the
electrode cannot be
calibrated.

Note:
Stability check can
be stopped (by
pressing cal).
However, this
reduces calibration
accuracy.

68

Display

Action

At the end of the adjustment
procedure the zero offset [mV]
of the electrode is displayed
(based on 25 °C).
Press enter to proceed.

Remark

This is not the final
calibration value of
the electrode! Zero
point and slope must
be determined using
a complete 2-point
calibration (cal 1100)
(see following pages).

Confirmation prompt.
Display of pH value (alternately
with Hold) and temperature,
“enter” blinks, Sensoface is
active.

Place electrode in process.

Press enter to end zero
calibration.

After end of calibra­tion, the outputs
remain in Hold
mode for approx.
20 sec.

Note for zero adjustment

After having adjusted the nominal zero point, be sure to calibrate
the electrode following one of the procedures as described on
the next pages:

• Automatic calibration with Calimatic

• Manual calibration

• Data entry of premeasured electrodes

69

Automatic calibration with Calimatic (BUF -xx-)
Automatic or manual temperature detection

The transmitter can only operate properly when the buffer solutions used
correspond to the configured set. Other buffer solutions, even those with
the same nominal values, may demonstrate a different temperature
response. This leads to measurement errors.

Display

70

Action

Press cal, enter code: 1100
Select position using ,
edit number using
press enter to proceed.

Remove the electrode and
temperature probe, clean them,
and immerse them in the first
buffer solution (in any order).
When “Manual temp detection”
has been configured, enter the
value in the secondary display
using the arrow keys.
Press enter to start.

Buffer recognition
While the “hourglass” icon is
blinking, the electrode and
temperature probe remain in
the first buffer solution.

Buffer recognition terminated,
the nominal buffer value is
displayed.



,

Remark

If an invalid code is
entered, the trans­mitter returns to
measuring mode.

Transmitter in Hold
mode, measured
value frozen.
Sensoface inactive.

The response time
of the electrode
and temperature
probe is consider­ably reduced when
the electrode is
first moved about
in the buffer solu­tion and then held
still.

Display Action

Stability check:
The measured mV value is
displayed.

Calibration with the first buffer
is terminated. Remove the
electrode and temp probe
from the first buffer solution
and rinse them thoroughly.

Remark

To abort stability
check: Press cal.

(accuracy reduced)

• One-point calibration:

Press cal to end the calibration.
Slope [%] and offset [mV ] of
the electrode are displayed.
Press enter to proceed.

• Two-point calibration:

Immerse sensor and tempera­ture probe in the second buffer
solution.

enter to start.

Press
Retract electrode and temp

probe out of second buffer,
rinse off, re-install.
Repeat calibration: cal
End calibration:

pH value and “Hold” are
displayed alternately. Sensoface
is active, “enter” blinks.
Press

enter

Hold is deactivated after 20 sec.

enter

to proceed.

For one-point
calibration only:

The calibration pro­cess runs again as
for the first buffer.

Slope and offset of
electrode (related to
25 °C) are displayed.

Confirmation
prompt.

71

Manual Calibration
Automatic or manual temperature detection

For calibration with manual buer specication, you must enter the pH
value of the buer solution used in the transmitter for the proper tempera­ture. This presetting enables calibration with any desired buer solution.
The MAN calibration mode and the type of temperature detection are
selected in the conguration mode.

Display

72

Action

Press cal, enter code: 1100
Select position using ,
edit number using ,
press enter to proceed.

Remove the electrode and
temperature probe, clean them
and immerse them in the first
buffer solution (in any order).
When “Manual temp detection”
has been configured, enter the
value in the secondary display
using the arrow keys.
Press enter to start.

Enter the pH value of your
buffer solution for the proper
temperature. While the “hour­glass” icon is blinking, the elec­trode and temperature probe
remain in the buffer solution.

Remark

If an invalid code is
entered, the trans­mitter returns to
measuring mode.

Transmitter in Hold
mode, measured
value frozen.
Sensoface inactive.

The response time
of the electrode
and temperature
probe is consider­ably reduced when
the electrode is
first moved about
in the buffer solu­tion and then held
still.

Display Action

Stability check:
The measured mV value is
displayed.

Calibration with the first buffer
is terminated. Remove the
electrode and temp probe
from the first buffer solution
and rinse them thoroughly.

Remark

To abort stability
check: Press cal.

(accuracy reduced)

• One-point calibration:

Press cal to end the calibration.
Slope [%] and offset [mV ] of
the electrode are displayed.
Press enter to proceed.

• Two-point calibration:

Immerse electrode and
temperature probe in the
second buffer solution. Enter
pH value of second buffer
solution. Press

Retract electrode and temp
probe out of second buffer,
rinse off, re-install.
Repeat calibration: cal
End calibration:

pH value and “Hold” are
displayed alternately.
Sensoface is active, “enter”
blinks. Exit using
Hold is deactivated after 20 sec.

enter to start.

enter

enter

key.

For one-point
calibration only:

The calibration
process runs again
as for the first buf­fer.

Slope and offset of
electrode (related to
25 °C) are displayed.

Confirmation
prompt.

73

Data entry of premeasured electrodes

You can directly enter the values for slope and oset of an electrode. The
values must be known, e.g. determined beforehand in the laboratory.
The DAT calibration mode must have been preset during conguration.

Display

Action

Press cal, enter code: 1100
Select position using ,
edit number using ,
press enter to proceed.

Ready for calibration
Start with

Enter offset [mV].
Select position using ,
enter number using ,
press

Enter slope [%]. Select using
, edit number using ,
press

The transmitter displays the
new slope and offset (at 25 °C).
Press

pH value and “Hold” are
displayed alternately. Sensoface
is active, “enter” blinks.
Press
Hold is deactivated after 20 sec.

enter

enter

enter

enter

enter

.

to proceed.

to proceed.

to proceed.

to proceed.

Remark

If an invalid code is
entered, the trans­mitter returns to
measuring mode.

Transmitter in Hold
mode, measured
value frozen.
Sensoface inactive.

Confirmation
prompt.

74

Converting slope [%] to slope [mV/pH] at 25 °C:

% mV/pH

78 46.2
80 47.4
82 48.5
84 49.7
86 50.9
88 52.1
90 53.3
92 54.5
94 55.6
96 56.8
98 58.0

100 59.2

102 60.4

Converting offset to electrode zero point:

ZERO = 7 -

V

[mV]

OFF

S [mV / pH]

ZERO
V

OFF

S

Electrode zero point
Offset
Slope

75

Product calibration

Calibration by sampling

During product calibration the electrode remains in the process.
The measurement process is only interrupted briefly.

Procedure: During sampling the currently measured value is saved
in the transmitter. The transmitter immediately returns to measuring
mode.
The calibration mode indicator blinks and reminds you that calibra­tion has not been terminated.
The sample is measured in the lab or directly on the site using a
portable meter. To ensure an exact calibration, the sample tempera­ture should correspond to the measured process temperature.
The measured sample value is then entered in the transmitter.
From the difference between the saved measured value and entered
sample value, the transmitter calculates the new offset (one-point
calibration).
If the sample is invalid, you can take over the value saved during
sampling. In that case the old calibration values are saved.
Afterwards, you can start a new product calibration.

Display

76

Action

Product calibration step 1:
Press cal, enter code: 1105
(Presskey to select position,
enter number usingkey,
press enter to confirm)

Take sample and save value.
Press enter to proceed.

Remark

If an invalid code
is entered, the
transmitter returns
to measuring mode.

Now the sample
can be measured in
the lab.

Display

Action

Remark

Measuring mode:

From the blinking CAL mode
indicator you see that sample
calibration has not been
terminated.

Product calibration step 2:
When the sample value has
been determined, open the
product calibration once more
(cal, code 1105).

Enter lab value.
The new offset is calculated.

Display of slope and new offset
(related to 25°C).
Press enter to end calibration.

The measured value is shown
in the main display alternately
with “Hold”. Sensoface is active,
“enter” blinks.
Press enter to exit calibration.

Until the sample
value is deter­mined and can be
entered, the
transmitter is in
measuring mode.

Display (approx.
3 sec)

New calibration:
Press cal.

After end of
calibration, the
outputs remain in
Hold mode for
approx. 20 sec.

77

ORP calibration

ORP calibration mode is automatically preset when ORP measurement is
configured. The potential of a redox electrode is calibrated using a redox
(ORP) buffer solution. In the course of that, the difference between the
measured potential and the potential of the calibration solution is deter­mined according to the following equation. During measurement this
difference is added to the measured potential.

mV

mV

ORP = mVmeas

The electrode potential can also be related to another reference system –
e.g. the standard hydrogen electrode. In that case the temperature­corrected potential (see table) of the reference electrode used must be
entered during calibration. During measurement, this value is then added
to the ORP measured.
Please make sure that measurement and calibration temperature are the
same, since the temperature response of the reference electrode is not
automatically taken into account.

+ ∆mV

mV
∆mV =

displayed ORP

=

ORP

=

direct electrode potential

meas

delta value, determined during
calibration

Temperature dependence of commonly used reference
systems

Temperature
[°C]

0
10
20
25
30
40
50
60
70
80

Ag/AgCl/KCl
1 mol/L
[∆mV]

249
244
240
236
233
227
221
214
207
200

Ag/AgCl/KCl
3 mol/L
[∆mV]

224
217
211
207
203
196
188
180
172
163

Thalamid
[∆mV]

-559

-564

-569

-571

-574

-580

-585

-592

-598

-605

Mercury
sulfate
[∆mV]

672
664
655
651
647
639
631
623
613
603

78

Display

Action

Select calibration (Press cal).
Enter passcode: 1100
Select position using ,
enter number using ,
press enter to proceed.

Remove the electrode and
temperature probe, clean them
and immerse them in the redox
buffer.

Enter setpoint value for redox
buffer (secondary display:
electrode potential displayed
for approx. 6 sec)
Select position using ,
enter number using ,
press enter to proceed.

Display of electrode data
(delta value)
Press enter to proceed.
Rinse electrode and tempera­ture probe and reinstall them.

Remark

If an invalid code
is entered, the
transmitter returns
to measuring mode.

Display (approx.
3 sec)
The transmitter is
in the Hold mode.

After approx. 6 sec
the secondary
display shows
the measured
temperature.

“Zero” and “enter”
icons are blinking,
Sensoface is active.

The measured ORP value [mV]
is shown in the main display
alternately with “Hold”, “enter”
blinks, Sensoface is active.
Press enter to exit calibration.

After end of cali­bration, the out­puts remain in Hold
mode for approx.
20 sec.

79

Temp probe adjustment

Display

Action

Select calibration
(Press cal,
enter passcode: 1015)
Select position usingkey,
edit number using
Press

Measure the temperature of
the process medium using an
external thermometer

Measurement

Display

Remark

In the measuring mode the main display shows the
configured process variable (pH or ORP [mV]) and the
lower display the temperature.
During calibration you can return to measuring mode
by pressing the cal key, during configuration by
pressing conf.
(Waiting time for signal stabilization approx. 20 sec).





key.

key.

enter to proceed.

Enter measured temperature
value.
Select position usingkey,
edit number using
Press

enter to proceed.
Press enter to exit adjustment.
HOLD will be deactivated after
20 sec.

Remark

Wrong settings
change the mea­surement proper­ties! If an invalid
code is entered, the
transmitter returns
to measuring mode.

The transmitter is in
the Hold mode.

Default:
Value of secondary
display.

80

Diagnostics functions

Display

Remark

Display of output currents

Press enter while in measuring mode.
The current at output 1 is shown in the main display,
the current at output 2 in the secondary display.
After 5 sec the transmitter returns to measuring mode.

Display of calibration data (Cal Info)

Press cal while in measuring mode and enter code:

0000. The slope is shown in the main display,
the offset in the secondary display.
After 20 sec the transmitter returns to measuring
mode (immediate return at pressing enter).

Display uncorrected electrode potential

(Sensor monitor)
Press conf while in measuring mode and enter code:

2222. The (uncompensated) electrode potential is
shown in the main display, the measuring tempera­ture in the secondary display. Press enter to return to
measurement.

Display of last error message

(Error info)
Press conf while in measuring mode and enter code:

0000. The last error message is displayed for approx.
20 sec.
After that the message will be deleted (immediate
return to measurement at pressing enter).

81

Diagnostics functions

These functions are used for testing the connected peripherals.

Display

82

Select a
relay

Test 0/1
Return to

measure­ment

Action / Remarks

Specify current at output 1

• Press conf, enter code: 5555
The current indicated in the main display for output 1
can be edited.
Select position using , edit number using ,
press

enter to confirm. Then the entered value will
be shown in the secondary display.
The transmitter is in Hold mode.
Press conf, then enter to return to measurement
(Hold remains active for another 20 sec).

Specify current at output 2

• Press conf, enter code: 5556
The current indicated in the main display for
output 2 can be edited.
Select position using , edit number using ,

enter to confirm. Then the entered value will

press
be shown in the secondary display.
The transmitter is in Hold mode.
Press conf, then enter to return to measurement
(Hold remains active for another 20 sec).

Relay test (manual test of contacts)

• Press conf, enter code: 5557
The relays are frozen. This state is indicated in the
display. The 4 digits in the display correspond to the
4 relays (as located on the terminal plate):
1st digit: R1
2nd digit: R2
3rd digit: AL
4th digit: CLN
Function test using arrow keys – see left column.
When exiting the function (enter), the relays are set
corresponding to the measured value.

Display

Controller
characteristic

The arrows indicate
which relay (valve)
is active:

+100 %

Controller
output

Setpoint

-100 %

Relay 2 active
(Meas. value >
setpoint)

Relay 1 active
(Meas. value <
setpoint)

Action / Remarks

Controller test (manual specification of controller
output)

• Press conf, enter code: 5559
After function activation “Ctrl” is displayed for
approx. 3 sec. With the controller turned off, “OFF” is
displayed in addition, then return to measuring
mode.
The function is used to start up control loops or
check the actuators.
For bumpless changeover to automatic operation
(exiting this function), configure an I-action
component (reset time).

Specify value:
Select usingkey, edit number usingkey.
Press

enter to proceed.

The transmitter is in Hold mode.
Press enter to return to measurement (Hold remains
active for another 20 sec).

Controller output -100 to 0 %: Relay 2 active

Controller output 0 to +100 %: Relay 1 active

Momentary controller output (adjusted value has
not been saved yet)

83

Controller functions

PID controller

P Controller

Application in integrating systems
(e.g. closed tank, batch processes).

PI controller

Application in non-integrating systems
(e.g. drains).

PID controller

The additional derivative action compensates for measurement
peaks.

Controller characteristic

Proportional
action Y

P

[%]

Neutral zone Yp=0

Relay 1

+100 %

Setpoint

84

-100 %

pH

Relay 2

Controller equations

Controller output Y = YP + YPdt + T

P action

1

T

R

I action

dY

D

dt

D action

P

Proportional action Y

Setpoint - Meas. value

YP =

Constant

P

*

KC

with:
Y
T

T

K

Constant 5 (for pH)
500 mV (for ORP)

P
R

D

C

Proportional action
Reset time [s]

Rate time [s]

Controller gain [%]

Neutral zone (Y=0)

Tolerated deviation from desired value.
With the setting “1 pH”, for example, a deviation of ± 0.5 pH
from the desired value does not activate the controller.

Proportional action (Gradient KC [%])

100 %

Controller

50 %

output Y

X

w

KC = 500 %

1 / (100) 2 / (200)

Deviation

KC = 200 %

KC = 100 %

KC = 50 %

3 / (300)

4 / (400)

(Process variables: pH/ (mV))

5 / (500)

85

Controller functions

Pulse length / pulse frequency controller

Pulse length controller (PLC)

The pulse length controller is used to operate a valve as an actuator.
It switches the contact on for a time that depends on the controller
output. The period is constant. A minimum ON time of 0.5 sec is
maintained even if the controller output takes corresponding values.

Output signal (relay contact) of pulse length controller

ON time (Y = 20 %)

0

0

ON time (Y = 80 %)

Pulse length

Pulse frequency controller (PFC)

The pulse frequency controller is used to operate a frequency­controlled actuator. It varies the frequency with which the
contacts are switched on. The maximum pulse frequency
[pulses/min] can be defined. It depends on the actuator.
The contact ON time is constant. It is automatically calculated
from the user-defined maximum pulse frequency:

Output signal (relay contact) of pulse frequency controller

1
0

1
0

ON time

Pulse frequency ( Y = 20%)

Pulse frequency ( Y = 80%)

86

Error messages (error codes)

Error

ERR 01

ERR 02

ERR 98

ERR 99

Display

Measured
value
blinks

Measured
value
blinks

“Conf”
blinks

“FAIL”
blinks

Problem
Possible causes

pH electrode

• Electrode defective

• Too little electrolyte in electrode

• Electrode not connected

• Break in electrode cable

• Incorrect electrode connected

• Measured pH value < -2 or > 16

• Measured ORP value

< -1999 mV or > 1999 mV

Redox electrode

• Electrode defective

• Electrode not connected

• Break in electrode cable

• Incorrect electrode connected

• Electrode potential < -1500 mV

• Electrode potential > 1500 mV

System error

Configuration or calibration data
defective; completely reconfigure
and recalibrate the transmitter.
Memory error in device program

Factory settings

EEPROM or RAM defective
This error message only occurs in
the case of a total defect.
The transmitter must be repaired
and recalibrated at the factory.

Red LED

Out 1 (22 mA)

Alarm contact

xx

xx

xx

xx

Out 2 (22 mA)

x

x

x

x

x

x

87

Error

ERR 03

ERR 11

ERR 12

ERR 13

ERR 21

ERR 22

ERR 23

ERR 41
ERR 42

ERR 33
ERR 34

Icon
(blinks)

Problem
Possible causes

Temperature probe

Open or short circuit
Temperature range exceeded

Current output 1

Current below 0 (3.8) mA

Current output 1

Current above 20.5 mA

Current output 1

Current span too small / too large

Current output 2

Current below 0 (3.8) mA

Current output 2

Current above 20.5 mA

Current output 2

Current span too small / too large

Rinsing probe: Communication
Calibration error

Sensocheck: Glass electrode
Reference electrode

• Zero error, Sensoface active, see Pg 93

• Slope error, Sensoface active, see Pg 93

Red LED

Out 1 (22 mA)

Alarm contact

xx

xx

xx

xx

xx

xx

xx

xx

xx

Out 2 (22 mA)

x

x

x

x

x

x

x

x

x

x

x

88

• Response time exceeded, Sensoface active, see Pg 93

• Calibration interval expired, Sensoface active, see Pg 93

Calibration error messages

Icon blinks:

Problem
Possible causes

Offset out of range (±60 mV)

• Electrode worn out

• Buffer solutions unusable or contaminated

Buffer does not belong to configured buffer set

•

• Temperature probe not immersed in buffer

solution (for automatic temperature
compensation)

• Wrong buffer temperature set

(for manual temperature specification)

• Nominal electrode zero point ≠ pH 7

Electrode slope out of range (80...103 %)

• Electrode worn out

• Buffer solutions unusable or contaminated

• Buffer does not belong to configured buffer set

Temperature probe not immersed in buffer

•

solution (for automatic temperature
compensation)

• Wrong buffer temperature set (for manual

temperature specification)

• Electrode used has different nominal slope

Problems during recognition
of the buffer solution

• Same or similar buffer solution was used for both
calibration steps

• Buffer solution used does not belong to buffer set
currently configured in the transmitter

89

Icon blinks:

Problem
Possible causes

Problems during recognition
of the buffer solution (continued)

During manual calibration the buffer solutions

•

were not used in the specified order

• Buffer solutions unusable or contaminated

• Wrong buffer temperature set

(for manual temperature specification)

• Electrode defective

• Electrode not connected

• Electrode cable defective

Calibration was canceled after approx.
2 minutes because the electrode drift was too
large.

• Electrode defective

• Electrode dirty

• No electrolyte in the electrode

Electrode cable insufficiently shielded or

•

defective

• Strong electric fields influence the measure-

ment

Major temperature fluctuation of the buffer

•

solution

• No buffer solution or extremely diluted

90

Operating states

Operating state

Measuring

Alarm contact

LED

Rel.1/2

Controller

Limit value

Out 2

Out 1

Rel.1/2

Timeout

Cal Info
(cal) 0000

Error Info
(conf) 0000

Calibration
(cal) 1100

Temp adjustment
(cal) 1015

Explanation:

active
as configured (Last/Fix or Last/Off )

LED blinks during HOLD (configurable)

20
s

20
s

91

Operating state

Product calibration
Step 1:
(cal) 1105
Step 2:
(cal) 1105

Configuration
(conf) 1200

Parameter set 1/2
(conf) 7654

Sensor monitor
(conf) 2222

Current source 1
(conf) 5555

Current source 2
(conf) 5556

Relay test
(conf) 5557

Manual controller
(conf) 5559

Rinse function

HOLD input

Alarm contact

LED

20
min

20
min

20
min

20
min

20
min

20
min

20
min

Timeout

Rel.1/2

Out 2

Out 1

Rel.1/2

Controller

Limit value

92

Sensoface

(Sensocheck must have been activated during configuration.)

The smiley in the display (Sensoface) alerts to electrode problems
(defective sensor, defective cable, maintenance required). The
permitted calibration ranges and the conditions for a friendly,
neutral, or sad Sensoface are summarized in the following table.
Additional icons refer to the error cause.

Sensocheck

Continuously monitors the electrodes and wires for short circuits
or open circuits. Critical values make the Sensoface “sad” and the
corresponding icon blinks:

The Sensocheck message is also output as error message Err 33.
The alarm contact is active, the red LED is lit, output current 1 is
set to 22 mA (when configured correspondingly). Sensocheck
can be switched off during configuration (then Sensoface is
also disabled). Exception: After a calibration a smiley is always
displayed for confirmation.

Note

The worsening of a Sensoface criterion leads to the devaluation
of the Sensoface indicator (Smiley becomes “sad”).
An improvement of the Sensoface indicator can only take place
after calibration or removal of the electrode defect.

93

Display

Problem

Offset and
slope

Status

Offset (zero point) and slope of the
electrode are still okay,
however, the electrode should be
replaced soon.

Offset and slope of the electrode
have reached values which no longer
ensure proper calibration.
Replace the electrode.

94

Calibration
timer

Electrode
defect

Over 80 % of the calibration interval
has already past.

The calibration interval has been
exceeded.

Check the electrode and its
connections
(see also error messages
Err 33 and Err 34).

Appendix

Product line and accessories

Devices Order No.

si794 P LXV505.99.00002

Mounting accessories

Bracket kit LZY483
Panel mounting kit LZY484
Protective hood LZY485
Pillar incl. protective hood and bracket kit LZY576

Spare parts

Installation kit, si792 / si794 LZY486
Rear housing, si792 / si794 LZY487

95

Specications

pH/mV input Input for pH or ORP electrodes or ISFET sensors

Measuring range -1500 ... +1500 mV
Display range pH value -2.00 ... 16.00
ORP -1999 ... +1999 mV
Glass electrode input
Input resistance > 0.5 x 1012 ohms
Input current < 2 x 10
Reference electrode input
Input resistance > 1 x 1010 ohms
Input current < 1 x 10
Meas. error
pH value < 0.02 TC: 0.002 pH/K (display)
mV value < 1 mV TC: 0.1 mV/K

pH sensor standardization * pH calibration
Operating modes BUF Calibration with Calimatic automatic buffer

MAN Manual calibration with input of individual

DAT Data entry of pre-measured electrodes

Zero adjustment ±200 mV
Max. calibration range Offset: ±60 mV
Slope: 80 ... 103 % (47.5 ... 61 mV/pH)

ORP sensor standardization * ORP calibration
Max. calibration range -700 ... +700 ∆mV

Cal timer 0000 ... 9999 h

Sensocheck Automatic monitoring of glass and reference

Sensoface Provides information on the sensor condition,

1,2,3

1

-12

-10

A

A

1

recognition

buffer values

electrode (can be disabled)

evaluation of zero/slope, response time,
calibration interval, Sensocheck

96

Temperature input * Pt100/Pt1000/NTC 30 kΩ/NTC 8.55 kΩ/Balco 3kΩ

2-wire connection, adjustable
Measuring range Pt 100/Pt 1000 -20.0 ... +200.0 °C
(-4 ... +392 °F)
NTC 30 kohms -20.0 ... +150.0 °C
(-4 ... +302 °F)
NTC 8.55 kohms -10.0 ... +130.0 °C
(-4 ... +266 °F)
Balco 3 kohms 0.0 ... +100.0 °C
(+32 ...+212 °F)
Adjustment range 10 K
Resolution 0.1 °C / 1 °F
Measurement error

Temp compensation Linear –19.99 ... +19.99 %/K
of process medium (reference temp 25 °C)
HOLD input Galvanically separated (OPTO coupler)

Function Switches transmitter to HOLD mode
Switching voltage 0 ... 2 V (AC/DC) Inactive
10 ... 30 V (AC/DC) Active

CONTROL input Galvanically separated (OPTO coupler)
Function Control input for automatic cleaning/calibration

Switching voltage 0 ... 2 V (AC/DC) Inactive
10 ... 30 V (AC/DC) Active
Output 1 0/4 to 20 mA, max. 10 V, floating
(galvanically connected to output 2)
Measured variable * pH or mV value
Overrange
Output averaging filter * Low-pass, filter time interval 0 ... 120 s
Measurement error
Start/end of scale Configurable within the measuring range for

Span allowed pH 2.00 ... 18.00 / 200 ... 3000 mV

*

1,2,3

1

<0.5 K (<1 K for Pt100; <1 K for NTC >100°C)

system

22 mA in the case of error messages

< 0.3% current value + 0.05 mA

pH or mV

97

Specications

Output 2 0/4 ... 20 mA, max. 10 V, floating

(galv. connected to output 1)
Process variable Temperature
Overrange
Output averaging filter * Low-pass, filter time interval 0 ... 120 s
Measurement error
Start/end of scale * 20 ... 200 °C / -4 ... 392 °F
Span allowed 20 ... 220 K (36 ... 396 °F)

Power output For operating an ISFET adapter
+3 V (V
–3 V (V0 = -4.8 ... –3,7 V / Ri = 360 Ω

Alarm contact Relay contact, floating
Contact ratings AC< 250 V / < 3 A / < 750 VA
DC< 30 V / < 3 A / < 90 W
Contact response N/C (fail-safe type)
Alarm delay 0000 ... 0600 sec

Limit values Output via relay contacts R1, R2
Contacts R1, R2 floating but inter-connected
Contact ratings AC< 250 V / < 3 A / < 750 VA
DC< 30 V / < 3 A / < 90 W
Contact response
Delay
Setpoints
Hysteresis * 00.00 ... 05.00 pH / 0000 ... 0500 mV

PID process controller Output via relay contacts R1, R2 (see limit values)
(Relay R1: base valve, relay R2: acid valve)
Setpoint specification * pH -02.00 ... 16.00 / -1500 ... +1500 mV
Neutral zone * pH 00.00 ... 05.00 pH / 0000 ... 0500 mV
P-action component
I-action component
(0000 s = no integral action)
D-action component * Rate time Td: 0000 ... 9999 s
(0000 s = no derivative action)
Controller type
Pulse period * 0001 ... 0600 s, min. ON time 0.5
(pulse length controller)

*

*

*

*

*

22 mA in the case of temp error messages

1

*

*

< 0.3% current value + 0.05 mA

= 2.9 ... 3.1 V / Ri = 360 Ω

0

N/C or N/O
0000 ... 9999 s
As desired within range

Controller gain KP: 0010 ... 9999 %
Reset time Tr: 0000 ... 9999 s

Pulse length or pulse frequency controller

98

Max. pulse frequency * 0001 ... 0180 min
(pulse frequency controller)

Display LC display, 7-segment with icons
Main display Character height 17 mm, unit symbols 10 mm
Secondary display Character height 10 mm, unit symbols 7 mm
Sensoface 3 status indicators (friendly, neutral, sad face)

Mode indication 5 mode indicators “meas”, “cal”, “alarm”, “cleaning”, “config”
18 further icons for configuration and messages
Alarm indication Red LED in case of alarm or HOLD, user defined

-1

Keypad 5 keys: [cal] [conf ] [
Service functions

Current source Current specifiable for output 1 and 2 (00.00 to 22.00 mA)
Manual controller Controller output entered directly (start of control process)
Device self-test Automatic memory test (RAM, FLASH, EEPROM)
Display test Display of all segments
Last error Display of last error occurred
Sensor monitor Display of direct, uncorrected sensor signal
(electrode)
Relay test Manual control of the four relay contacts

Parameter sets* Two selectable parameter sets for different applications

Data retention Parameters and calibration data > 10 years (EEPROM)

Protection against electric shock

Safe electrical isolation of all extra-low-voltage circuits

against mains by double insulation acc. to EN 61010-1

Power supply 24 (-15%) ... 230 V AC/DC (+10%); approx. 5 VA, 2.5 W
AC: 45 ... 65 Hz
Overvoltage category II, protection class II

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Specications

Nominal operating conditions

Ambient temperature -20 ... +55 °C
Transport/Storage temp -20 ... +70 °C
Relative humidity 10 ... 95% not condensing
Power supply 24 (-15%) ... 230 V AC/DC (+10%)
Frequency for AC 45 ... 65 Hz

EMC EN 61326
Emitted interference Class B (residential area)
Class A for mains > 60 V DC
Immunity to interference Industry

Enclosure Molded enclosure made of PBT
(polybutyleneterephtalate)
Color Bluish gray RAL 7031

Assembly • Wall mounting

• Pipe mounting: Ø 40 ... 60 mm

• Panel mounting, cutout to DIN 43 700

sealed against panel
Dimensions H 144 mm, W 144 mm, D 105 mm
Ingress protection IP 65 / NEMA 4X
Cable glands 3 knockouts for M20x1.5 cable glands
2 knockouts for NPT 1/2” or
rigid metallic conduit
Weight Approx. 1 kg

* User-defined

1) To IEC 746 Part 1, at nominal operating conditions

2) ± 1 count

3) Plus sensor error

30 ... 45 mm

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