Endress+Hauser Liquiline CM44P - Page 157

Liquiline CM44P Diagnostics and troubleshooting
Endress+Hauser 157
No. Message Factory settings Sensor
type
Tests or remedial action
S
1)
D
2)
F
3)
904 Process check
alarm
F On On All except
Phot
Stagnating measuring signal
Reasons: sensor in air, sensor fouling,
incorrect flow to sensor, sensor defective
1. Check electrode system.
2. Check sensor.
3. Restart the device.
914 USP/ EP alarm M On Off C USP limit values exceeded
‣
Check process.
915 USP / EP warning M On Off C
916 EasyCal certificate M On Off Phot EasyCal certificate expired
1. Send EasyCal for recertification and
enter new recertification date in Setup /
Photometer / calibration
2. If not used deactivate EasyCal
934 Process temp. high S Off Off N, S, U Process temperature high
1. Do not increase process
temperature.
2. Check electrode system.
3. Change sensor type.
935 Process temp. low S Off Off N, S, U Process temperature low
1. Do not lower process temperature.
2. Check electrode system.
3. Change sensor type.
942 Process value S Off Off N, P, U Process value high
1. Do not increase process value.
2. Check electrode system.
3. Change sensor type.
943 Process value S Off Off N, P, U Process value low
1. Do not decrease process value.
2. Check electrode system.
3. Change sensor type.
944 Sensor range S On Off S, U Measurement at periphery of sensor
dynamic range
Reasons: changes in process to a higher
or lower measuring range
1. Check application.
2. Use sensor that suits the
measuring range of the
application.
945 pH value high S On Off DI Warning maximum pH value exceeded
1. Check application.
2. Check pH sensor.
946 pH value low S On Off DI Warning minimum pH value not reached.
Potential leaking of gaseous chlorine!
1. Check application.
2. Check pH sensor.