Xylem MultiLab 4010-2 - Manual (Page 90)

What to do if... MultiLab 4010-2
90 ba76142e01 05/2013
No stable measured
value
Obviously incorrect
measured values
13.2 Dissolved oxygen
Error message,
OFL
Error message,
Error
Cause Remedy
IDS pH sensor:
– Diaphragm contaminated – Clean diaphragm
– Membrane contaminated – Clean membrane
Test sample:
– pH value not stable – Measure with air excluded if
necessary
– Temperature not stable – Adjust temperature if necessary
IDS pH sensor + test sample:
– Conductivity too low – Use suitable IDS pH sensor
– Temperature too high – Use suitable IDS pH sensor
– Organic liquids – Use suitable IDS pH sensor
Cause Remedy
IDS pH sensor:
– IDS pH sensor unsuitable – Use suitable IDS sensor
– Temperature difference between
buffer and test sample too great
– Adjust temperature of buffer or
sample solutions
– Measurement procedure not suit-
able
– Follow special procedure
More information and instructions on cleaning and exchange of
sensors are given in the documentation of your sensor.
Cause Remedy
– Measured value outside the measur-
ing range
– Select a suitable measuring
medium
Cause Remedy
– Sensor contaminated – Clean the sensor