Hach-Lange SI794 I User Manual
DOC023.52.90116
si794 I
Inductive Conductivity
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 I.....................................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 ........................22
Interface and navigation .................................24
si794 user interface ......................................24
si794 display.............................................25
Operation: Keypad.....................................26
Safety functions .......................................27
Sensocheck, Sensoface sensor monitoring ...............27
GainCheck device self-test ...............................27
Automatic device self-test ...............................27
Hold mode .............................................28
External activation of HOLD mode .......................29
Overview of configuration steps ........................30
Output 1 ................................................36
Output 2 ................................................52
Temperature compensation..............................58
Alarm settings ...........................................60
Limit function ...........................................62
Controller ...............................................66
Control of rinsing probe / Signaling parameter set........68
Selecting parameter set 1/2 ..............................70
3
External switchover of parameter sets ....................71
Parameter set, individual settings (original for copy) . . . . . . 74
Calibration by entry of cell factor............................78
Calibration with calibration solution......................80
Product calibration ......................................82
Zero calibration in air ....................................84
Zero calibration with calibration solution .................86
Temp probe adjustment .................................88
Diagnostics functions ..................................89
Display of output currents ...............................89
Display of calibration data ...............................89
Sensor monitor for validation ............................89
Display of last error message .............................89
Specify current at output 1 (current source 1).............90
Specify current at output 2 (current source 2).............90
Relay test (manual test of contacts) ......................90
Controller test (manual specification of controller output) 91
Controller functions....................................92
PID controller............................................92
Pulse length / pulse frequency controller.................94
Error messages (error codes)............................96
Operating states.........................................98
Sensoface ..............................................100
Specifications ........................................104
Calibration solutions....................................110
Concentration curves ...................................112
Contact information ....................................118
Limited warranty .......................................120
Index...................................................122
Passcodes ..............................................128
4
Intended use
The si794 I transmitter is used for measurement of electrical conductivity and temperature in liquids using electrodeless sensors.
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 electrodeless 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 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.
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 I
receive hi
receive lo
drain
send lo
send hi
shield
RTD
RTD
hold
hold/
control
control
1
CondI
input
Output 1
2
3
4
Output 2
R1
5
R2
9
10
11
12
13
14
+ output 1
- output 1/2
+ output 2
relay 1
relay 1/2
relay 2
C
Temp
D
input
Alarm
E
Clean
6
7
8
HOLD
input
Control
input
PSet2
Power
15
16
17
18
19
20
alarm
alarm
clean
Pset2
clean
PSet2
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 I terminal assignments
16
3
2
1 Terminals for temperature probe and outer shield
2 Terminals for sensor
3 Terminals for power supply
1
Fig.: Information on installation, rear side of device
17
Wiring example 1
Polymetron 8398 series sensors
8398.2
8398.3
8398.5
si794 I
receive hi
receive lo
drain
send lo
send hi
Jumper!
Black
Brown
Black
White
Caution!
Place jumper across terminals 3 and 4!
18
shield
White
RTD
Green
RTD
Yellow
Wiring example 2
Siemens 2200 series sensors
7MA2200-8DA
7MA2200 8CB
7MA2200 8BF
si794 I
receive hi
receive lo
drain
send lo
send hi
Jumper!
Yellow
Violet
Blue
White
Brown
Green
Caution!
Place jumper across terminals 3 and 4!
shield
Black
RTD
RTD
Gray
Red
Pink
19
Wiring example 3
GLI 3700 series sensor
si794 I
receive hi
receive lo
drain
send lo
send hi
Jumper!
Yellow
White
Blue
Green
Caution!
Place jumper across terminals 3 and 4!
20
shield
Shield
RTD
RTD
Red
21
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
22
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!
23
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 Congure key 8 Conguration 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
24
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 identies 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 Conguration mode
12 Main display
23 Sensofaces
25
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 cell factor and zero point
Error Info: Display of last error message
26
+
Start GainCheck device self-test
Safety functions
Sensocheck, Sensoface sensor monitoring
Sensocheck continuously monitors the sensor and its wiring.
Sensocheck can be switched o (Conguration).
Sensoface provides information on the conductivity sensor condition. The primary coil and its lines are
continuously monitored for short circuits, the secondary
coil and its lines are checked for open circuits. 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.
+
27
Safety functions
Hold mode
Display:
The Hold mode is a safety state during conguration and calibration. Output current is frozen (Last) or set to a xed value (Fix).
Alarm and limit contacts are disabled.
If the calibration or conguration mode is exited, the transmitter
remains in the Hold mode for safety reasons. This prevents undesirable reactions of the connected peripherals due to incorrect
conguration 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.
Conguration 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 conguration procedures.
The process should not change decisively during conguration. Changes are not noticed with this setting!
Fix: The output current is set to a value that is noticeably
dierent from the process value in order to signal the
control system that the transmitter is being worked at.
28
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 congurable.
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 60.
The alarm LED on the front panel can be congured as follows
HOLD o: Alarm: LED blinks
HOLD on: Alarm: LED on. HOLD: LED blinks
29
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).
30
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