wtw Multi 9420 - Dissolved Oxygen; Conductivity

Multi 9420 What to do if...
ba75964e04 04/2015 117
13.3 Dissolved oxygen
Error message,
OFL
Error message,
Error
13.4 Conductivity
Error message,
OFL
Error message,
Error
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
– 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 – Replace sensor
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
– 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