Liquistation CSF33 Diagnostics and troubleshooting
Endress+Hauser 139
No. Message Factory settings Tests or remedial action
S
1)
D
2)
F
3)
961 -
968
Diagnostic module 1
(961)
...
Diagnostic module 8
(968)
S Off Off Diagnostic module is enabled
969 Modbus Watchdog S Off Off The device did not receive a Modbus telegram
from the master within the specified time. The
status of Modbus process values received is set to
invalid
970 Curr. input overload S On On Current input overloaded
The current input is switched off from 23 mA due
to overload and reactivated automatically when a
normal load is present.
971 Current Input low S On On Current input too low
At 4 to 20 mA, the input current is less than the
lower failure current.
‣
Check the input for short-circuiting
972 Curr. input > 20 mA S On On Current output range exceeded
973 Current Input < 4 mA S On On Current output range undershot
974 Diagnostics confirm. C Off Off User has acknowledged the message displayed in
the measuring menu.
975 Device restart C Off Off Device reset
978 ChemoClean Failsafe S On On No feedback signal detected within the configured
period.
1. Check the application
2. Check the wiring
3. Extend the duration
990 Deviation limit F On On Redundancy: limit value of percentage deviation
exceeded
991 CO2 conc. range F On On CO
2
concentration (degassed conductivity) outside
the measuring range
992 pH calculation range F On On pH calculation outside the measuring range
993 rH calculation range F On On rH calculation outside the measuring range
994 Difference conduct. F On On Dual conductivity outside the measuring range
995 Mathematical error S On On Incorrect calculation result
1. Check the mathematical functions.
2. Check the input variables.
1) Status signal
2) Diagnostic message
3) Error current
11.5 Pending diagnostic messages
The Diagnostics menu contains all the information on the device status.
Furthermore, various service functions are available.
The following messages are directly displayed every time you enter the menu:
• Most important message
Diagnostic message recorded with the highest criticality level
• Past message
Diagnostic message whose cause is no longer present.
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