Oxymax COS22 Troubleshooting
Endress+Hauser 21
9 Troubleshooting
If one of the following problems is present, check the measuring system in the sequence
listed here.
Problem Testing Remedial action
No display, no sensor reaction Power supply to the transmitter? Connect the power supply
Sensor cable connected correctly? Set up correct connection.
Medium flow present? Create medium flow
Coating on the membrane? Clean sensor
No electrolyte in the measuring
chamber?
Refill or change electrolyte
Displayed value too high Polarization ended? Wait for polarization time to finish
Is sensor calibrated/adjusted? recalibrate/readjust
Displayed temperature clearly too
low?
Check sensor, if necessary send
sensor in for repair.
Membrane visibly stretched? Replacing the membrane cap
Electrolyte dirty? Electrolyte replacement
Open the sensor and dry the
electrode. Is the transmitter display
now at 0?
Check the cable connection. If the
problem persists, send in the sensor.
Displayed value too low Is sensor calibrated/adjusted? recalibrate/readjust
Medium flow present? Create medium flow
Displayed temperature clearly too
high?
Check sensor, if necessary send
sensor in for repair.
Coating on the membrane? Clean sensor
Electrolyte dirty? Electrolyte replacement
Display value fluctuating greatly Membrane visibly stretched? Replacing the membrane cap
Open the sensor and dry the
electrode. Is the transmitter display
now at 0?
Check the cable connection. If the
problem persists, send in the sensor.
Please observe the troubleshooting information in the Operating Instructions for the
transmitter. If need be, carry out a test on the transmitter.
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