Xylem YSI pH/ISE 1320P, Operation Manual

Page: 91 / 106

TruLab pH/ISE 1320 What to do if...
ba76161e01 08/2015
91
13.2 ISE
Error message OFL
Obviously incorrect
measured values
Error message,
Error (invalid
calibration)
or
Calibration
evaluation poor (-)
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
– Socket damp – Dry the socket
– Electrode needs maintenance – Use service and storage recom-
mendations in the electrode
manual.
– Replace internal fill solution and/
or the sensor module (if replace-
able).
– Refill hole is not open – Open the refill hole (if equipped)
during use
– Electrode junction not in solution – The outer junction should be
completely immersed in stan-
dard or sample.
– Level of internal fill solution (if
refillable) must be higher than
the level of standard or sample.
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