Xylem IQ SensorNet FDO 70x IQ (SW) - Manual (Page 33)

FDO
®
70x IQ (SW) What to do if...
6 - 1 ba76014e01 02/2012
6 What to do if...
Sensor does not appear
in the measured value
display and list of
sensors
Measured value
implausible
Measured value
fluctuating heavily
Cause Remedy
– Sensor cap not mounted or
defective
– Sensor cap (see section 5.3)
– Replace a defective sensor
cap as necessary
Cause Remedy
– Coating on sensor cap – Clean the outside of the sen-
sor (see section 5.4.1)
– Service life of the sensor cap
over
– Check the sensor (see sec-
tion 4.2.2)
– Replace the sensor cap as
necessary (see section 5.3)
– Dirt inside the sensor cap and
sensor head.
– Fixing ring not properly tight-
ened.
– Sensor cap untight or defec-
tive.
– Dismantle sensor cap
– Clean the insides of the sen-
sor cap and sensor head (see
section 5.4.2)
– Mount the sensor cap cor-
rectly and tighten the fixing
ring as far as it will go (see
section 5.3)
– Replace a defective sensor
cap as necessary
Cause Remedy
– Coating on sensor cap – Clean the outside of the sen-
sor (see section 5.4.1)
– Service life of the sensor cap
over
– See point "Measured value
implausible"
– Dirt inside the sensor cap and
sensor head.
– Fixing ring not properly tight-
ened.
– Sensor cap untight or defec-
tive.
– See point "Measured value
implausible"