wtw inoLab Multi 9310 IDS, Operating Manual, Page: 100 / 114

What to do if... inoLab
®
Multi 9310 IDS
100
ba75937e10 08/2021
Error message,
Error
15.3 Conductivity
Error message
OFL, UFL
The measured value is outside the measuring range.
Error message,
Error
15.4 Turbidity
Implausible turbidity
values
Cause Remedy
– Sensor contaminated – Clean the sensor
– Measured temperature value
outside the operating conditions
(display of OFL/UFL instead of a
temperature value)
– Keep to the temperature range for
the test sample
– Defective sensor – Calibration
– Exchange the sensor cap
– Replace the sensor
– Calibration failed – Recalibrate
– D.O. concentration during zero
point calibration too high.
– Immerse the sensor in an oxygen-
free solution
More information and instructions on cleaning and exchange of
sensors are given in the documentation of your sensor.
Cause Remedy
– Measured value outside the
measuring range
– Use suitable IDS conductivity sensor
Cause Remedy
– Sensor contaminated – Clean the sensor and replace it if
necessary
– Calibration solution not suitable – Check the calibration solutions
Cause Remedy
– There are gas bubbles (e.g. air
bubbles) in front of the measure-
ment window
– Remove the gas bubbles,
e.g.
by immersing the sensor at
an angle