Dissolved Oxygen - Xylem YSI MultiLab 4010P-1 Operation Manual

MultiLab 4010-1
No stable measured
value
Obviously incorrect
measured values
Error message,
OFL, UFL
ba76141e03 03/2014
Cause
IDS pH sensor:
– pH sensor 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:
– pH sensor unsuitable
– Temperature difference
between buffer and test sample
too great
– Measurement procedure not
suitable

14.2 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 pH sensor
– 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...
89