What to do if... FDO
®
925
14
ba75898e06 08/2015
4 What to do if...
Error symptom Cause Remedy
No temperature value
or D.O. value
– No connection between meter
and D.O. sensor
– Establish connection between
meter and D.O. sensor
– Cable defective – Return the D.O. sensor
Measured value too
high or too low
or
error message,
Error
– Coating on sensor cap – Clean the outside of the sensor
(see section 3.3.1)
– Membrane damaged – Exchange the sensor cap
– Service life of the sensor cap
over
– Check the sensor
– Replace the sensor cap as nec-
essary (see section 3.2)
– Dirt inside the sensor cap and
sensor head.
– Protective hood not properly
tightened.
– Sensor cap untight or defective.
– Dismantle the sensor cap
– Clean the insides of the sensor
cap and sensor head (see
section 3.3.2)
– Mount the sensor cap correctly
and tighten the protective hood
as far as it will go (see
section 3.2)
– Replace a defective sensor cap
as necessary
Incorrect temperature
display
– The temperature sensor is not
immersed deep enough in the
measuring solution
– Observe the minimum immer-
sion depth
– Temperature sensor defective – Return the D.O. sensor
Error message,
no cap
– No sensor cap put on – Clean the sensor head and sen-
sor cap
– Sensor cap not recognized – Return the D.O. sensor
– Sensor cap defective – Replace the sensor cap
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