Metrohm 914 pH / Conductometer - Manual (Page 72)

6.2 Problems
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pH Meter/Conductometer
6.2 Problems
The following list describes some general problems that might occur dur-
ing measurements. Furthermore, the possible causes and solution
approaches are described.
NOTE
Sensor treatment
Follow the instructions given in the respective leaflets for sensors clean-
ing and maintenance.
6.2.1 Troubleshooting
Problem Cause Remedy
Measured value set-
ting is sluggish. The glass membrane or the
diaphragm is contami-
nated. ￭ Clean the electrode following the instruc-
tions in the leaflet.
No measuring sig-
nal. The sensor is not con-
nected. ￭ Connect the sensor.
Wrong measuring channel
is selected. ￭ Select the correct measuring channel.
The sensor is defective. ￭ Replace the sensor.
The cable is defective. ￭ Replace the cable.
The electrode's reference
system contains air. ￭ Perform an electrode maintenance as
described in the leaflet.
The measuring input and/
or the measuring channel
is defective. ￭ Send the measuring instrument to the
Metrohm Service for inspection and, if nec-
essary, repair.
The instrument does
not start. The instrument battery is
not charged. ￭ Connect the instrument to the power sup-
ply unit to charge it.
The battery is only charged when the
instrument is on.
(total charging time: approx. 9 hours)
The measured value
drift criterion is not
fulfilled. The glass membrane or the
diaphragm is contami-
nated. ￭ Clean the electrode following the instruc-
tions in the leaflet.