Liquiline CM442R/CM444R/CM448R Diagnostics and troubleshooting
Endress+Hauser 121
951
-
958
Hold active CH1 ... 8 C On Off Output values and status of the channels are on
hold. Wait until the hold is released again.
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 error current.
→ Check the input for short-circuits.
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 screen.
975 Device reset C Off Off Device reset
976 PFM value high S On Off Pulse frequency modulation: output signal
exceeded/undershot. Measured value outside the
specified range.
Reasons: sensor in air, air pockets in assembly,
incorrect flow to sensor, sensor fouled.
1. Clean the sensor
2. Check plausibility
3. Adjust the PFM configuration.
977 PFM value low S On Off
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
981 S On Off One-time Chemoclean program started
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
No. Message Factory settings Tests or remedial measures
Cat. Diag.
on/off
Error
current
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