Dissolved Oxygen - wtw inoLab Multi 9310 IDS Operating Manual

®
inoLab Multi 9310 IDS
No stable measured
value
Obviously incorrect
measured values
Error message
OFL, UFL
ba75937e10 08/2021
Cause
IDS pH sensor:
– Junction contaminated
– Membrane contaminated
Test sample:
– pH value not stable
– Temperature not stable
IDS pH sensor + test sample:
– Conductivity too low
– Temperature too high
– Organic liquids
Cause
IDS pH sensor:
– Sensor unsuitable
– Temperature difference
between buffer and test sample
too great
– Measurement procedure not
suitable

15.2 Dissolved oxygen

More information and instructions on cleaning and exchange of
sensors are given in the documentation of your sensor.
The measured value is outside the measuring range.
Cause
– Measured value outside the
measuring range
Remedy
– Clean junction
– Clean membrane
– Measure with air excluded if neces-
sary
– Adjust temperature if necessary
– Use suitable IDS pH sensor
– Use suitable IDS pH sensor
– Use suitable IDS pH sensor
Remedy
– Use suitable IDS sensor
– Adjust temperature of buffer or sam-
ple solutions
– Follow special procedure
Remedy
– Use a suitable IDS D.O. sensor
What to do if...
99