JUMO 202755/20, Руководство по эксплуатации

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61
13 Eliminating faults and malfunctions
Error
possibilities
t
13.1 Checking the device
General The device is calibrated at the factory, and is maintenance-free. If,
nevertheless, measurement deviations appear with no apparent cause, the
transmitter can be tested as follows.
Problem Possible cause Measures
no measurement display
or
current output supply voltage
missing supply voltage
should be checked,
also check terminals
measurement display
000 or
current output 4 mA sensor not immersed in
medium,
reservoir level
too low top up the reservoir
flow-through fitting
is blocked flow-through fitting
should be cleaned
sensor is faulty see "Checking the
device", Page 61
wrong or
unstable
measurement display sensor not immersed
deeply enough top up the reservoir
inadequate mixing ensure good
mixing
for sensor: all-round
free space of approx.
5 mm
ensure all-round flow
air bubbles check mounting site,
see "General", Page 18.
Measurement value dis-
play 8888,
temperature display
"ok",
blinking Conductivity measure-
ment range overshoo-
ting or conductivity mea-
surement probe faulty. Select suitable measure-
ment range.
Replace conductivity
measuring transmitter.
Measurement value dis-
play 8888,
temperature display
8888
blinking Temperature measure-
ment range overshoo-
ting or undershooting or
short circuit or interrupti-
on of the temperature
sensor. The temperature of the
measuring medium must
be in the range from
0...150°C.
Replace the conductivity
measuring transmitter.
Send the device for re-
pairs.