Diagnostics and troubleshooting Liquistation CSF34
158 Endress+Hauser
No. Message Factory settings Tests or remedial action
S
1)
D
2)
F
3)
939 Control. disturbance S On Off Controller input warning
Status of disturbance variable is not OK
‣
Check application.
951 -
958
Hold active CH1 .. C On Off Output values and status of the channels are on
hold.
‣
Wait until the hold is deactivated again.
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 application.
2. Check 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
1) Status signal
2) Diagnostic message
3) Failure current
11.6.2 Sensor-specific diagnostic messages
Operating Instructions "Memosens", BA01245C
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