Endress+Hauser Oxymax COS61D, Operating Instructions Manual

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Oxymax COS61D Troubleshooting
Hauser 25
9 Troubleshooting
9.1 Troubleshooting instructions
‣
If one of the following problems is present:
Check the measuring system in the order shown.
Problem Testing Remedial action
Nothing displayed, no
reaction from the sensor Power supplied to the transmitter?
‣
Establish the power supply.
Sensor cable connected correctly?
‣
Establish correct connection.
Deposit buildup on the fluorescence
layer of the sensor cap?
‣
Clean the sensor cap or fluorescence layer
carefully with a damp cloth.
Displayed value too high Is sensor calibrated/adjusted?
Measured value in air not 100 ± 2
%SAT?
‣
Recalibrate/readjust.
 When calibrating, enter the current
air pressure at the transmitter.
Displayed temperature clearly too
low?
‣
Check sensor, if necessary send sensor in
for repair.
Has salinity been taken into
account?
‣
Enter salinity value on transmitter.
Displayed value too low Is sensor calibrated/adjusted?
Measured value in air not 100 ± 2
%SAT?
‣
Recalibrate/readjust.
 When calibrating, enter the current
air pressure at the transmitter.
Displayed temperature clearly too
high?
‣
Check sensor, if necessary send sensor in
for repair.
Deposit buildup on the fluorescence
layer?
‣
Clean the sensor carefully with a damp
cloth.
Display in Vol% or %SAT
not plausible Medium pressure has not been
taken into account
‣
Enter medium pressure on transmitter.
1. Pay attention to the troubleshooting information in the Operating Instructions for
the transmitter.
2. Check the transmitter if necessary.
9.2 Checking the sensor
Testing Corrective action Set point
Slope check
‣
Place the sensor in air.
‣
Dry the sensor with a paper towel.
Measured value display after 1 min:
Approx. 100 % SAT
Zero-point check
‣
Immerse the sensor in COY8 zero-point gel
(→  30). Display after 30 min:
Close to 0 mg/l (0 % SAT)
1. In the case of deviations from the set points:
Perform troubleshooting as indicated in the troubleshooting instructions.
2. Contact the Sales Center if necessary.