Endress+Hauser Memosens COS81E, Operating Instructions Manual

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Memosens COS81E Diagnostics and troubleshooting
Hauser 25
8 Diagnostics and troubleshooting
8.1 General troubleshooting
‣
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.
Buildup on the spot cap?
‣
Clean the spot cap or luminescence layer
carefully with a soft 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.
Buildup on the luminescence
layer?
‣
Clean the sensor carefully with a soft
cloth.
Fluctuations in measured
value Are there air bubbles on the spot
cap? 1. Change the installation angle.
2. If necessary, change the cap type from a
u-shaped to a c-shaped cap.
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.