pH/ION 7320
What to do if...
ba75935e04
12/2017
91
13.2 ISE
Error message
OFL
Obviously incorrect
measured values
Error message,
Error (invalid
calibration)
or
Calibration
evaluation poor (-)
Warning
[TpErr]
Warning
[ISEErr]
Cause
Remedy
– Measuring range exceeded
– Dilute the test sample
Cause
Remedy
– Electrode not connected
– Connect the electrode
– Cable broken
– Replace the electrode
Cause
Remedy
ISE electrode:
– Moisture in the plug
– Dry the plug
– Electrode is old
– Replace the electrode
– Electrode not suitable 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 NH4 setting
– Select the following settings:
Ion type
"ION",
Valency
"-1"
– Socket damp
– Dry the socket
Calibration procedure:
– Wrong sequence of standards for
three point calibration
– Select the correct sequence
– 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 °C.
– Adjust the temperature of the
test sample
Cause
Remedy
– Electrode voltage outside calibrated
range
– Recalibrate
