CCS240/241
Diagnostics and troubleshooting
Hauser
21
8
Diagnostics and troubleshooting
When troubleshooting, you must take account of the entire measuring system. 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:
• Constant temperature after calibration, not required for measurement in "temperature-
compensated" mode
• Medium flow rate of at least 30 l/h (7.9 gal/h)(red bar mark when using the CCA250 flow
assembly)
• No use of organic chlorination agents
If the value measured by the sensor differs significantly from that of the DPD method,
you should 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
Measuring chamber is not filled
with electrolyte
‣
Fill measuring chamber (→ 25)
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
‣
Open measuring chamber, rub gold cathode
dry. If the transmitter display does not return to
zero, there is a shunt present.
Foreign oxidants interfering with
sensor
‣
Examine medium, check chemicals
