wtw pH/Cond 3320 - ISE

pH/Cond 3320 What to do if...
ba77054e03 03/2018 79
13.2 ISE
Error message OFL
Obviously incorrect
measured values
Error message Error
(invalid
calibration)
Warning [TpErr]
Warning [ISEErr]
Cause Remedy
– Measuring range exceeded – Dilute test sample
Cause Remedy
– Electrode not connected – Connect the electrode
– Cable broken – Replace the electrode
Cause Remedy
ISE electrode:
– Moisture in the plug – Dry plug
– Electrode obsolete – Replace the electrode
– Electrode unsuitable for the range to
be measured
– Use a suitable electrode
– Electrode not suitable for the
selected ion
– Use a suitable electrode or
select a suitable ion
– The gas-sensitive electrode NH 500
was calibrated with the Ion type
NH4 setting
– Select the following settings:
Ion type = ION,
Valency = -1
– Socket damp – Dry socket
Calibration procedure:
– Calibration standards do not have
the correct temperature (max.
± 2 °C
temperature difference)
– Adjust the temperature of the
calibration standards
Cause Remedy
– Temperature difference between
measurement and calibration
greater than 2 K.
– Adjust the temperature of the
test sample
Cause Remedy
– Electrode voltage outside calibrated
range
– Recalibrate