Endress+Hauser CCS50D, Руководство по эксплуатации

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CCS50D Diagnostics and troubleshooting
Hauser 29
8 Diagnostics and troubleshooting
When troubleshooting, the entire measuring point must be taken into account. This
comprises:
• Transmitter
• Electrical connections and lines
• Assembly
• Sensor
The possible causes of error in the following table refer primarily to the sensor. Before
commencing troubleshooting, ensure that the following operating conditions have been met:
• Measurement in "temperature-compensated" mode (can be configured on transmitter
CM44x) or constant temperature following calibration
• Medium flow of at least 5 l/h (1.3 gal/h) (when using Flowfit CCA151 flow assembly)
• No use of organic chlorination agents
If the value measured by the sensor differs significantly from that of the DPD method,
first consider all possible malfunctions of the photometric DPD method (see Operating
Instructions for photometer). If necessary, repeat the DPD measurement several times.
Error Possible cause Remedy
No display, no sensor current No supply voltage at the transmitter
‣
Establish mains connection
Connection cable between sensor and
transmitter interrupted
‣
Establish cable connection
There is no electrolyte in the
membrane cap
‣
Fill membrane cap
No input flow of medium
‣
Establish flow, clean filter
Display value too high Polarization of the sensor not yet
completed
‣
Wait for polarization to be completed
Membrane defective
‣
Replace membrane cap
Shunt resistance (e.g. moisture
contact) in the sensor shaft
‣
Remove membrane cap, rub cathode until
dry.
‣
If the transmitter display does not return
to zero, there is a shunt present: replace
sensor.
Foreign oxidants interfering with
sensor
‣
Examine medium, check chemicals