wtw Stirrox G, Operating Manual, Page: 15 / 22

StirrOx G What to do if ...
15 ba25310d07 08/2018
disposed of with the household refuse.
Electrolyte
solution
Disposal according to the safety data sheet.
6 What to do if ...
7 Technical data
Error symptom Cause Remedy
The sensor is in the air
and the display shows
0.0 mg/l or 0 % O
2
– No connection between
measuring instrument and sensor
– No electrolyte in the membrane
head
– Cable defective
– Check connection between
measuring instrument and sensor
– Replace and refill the membrane
cap (see section 5.3)
– Return the sensor
The sensor cannot be
calibrated – Contaminated membrane head
– Electrolyte depleted – Replace and refill the membrane
cap (see section 5.3)
Subsequently, wait for 30 to
50 min and recalibrate.
The sensor still cannot
be calibrated after
changing the electrolyte
and membrane cap – Contaminated electrodes or
sensor toxification
– Clean the electrodes (see
section 5.4)
Leak display appears – Membrane cap not screwed on
tight enough
– Hole in the membrane
– Screw membrane head tighter
– Replace and refill the membrane
cap (see section 5.3)
Incorrect temperature
display – Temperature sensor defective – Return the sensor
Mechanical damage to
the sensor – Return the sensor
Meter displays OFL
(display range exceeded)
– Short-circuit between working
electrode and counter electrode
– Clean the electrodes (see
section 5.4). If the meter still
displays
OFL , return the sensor.
Stirrer does not move – No power supply
– Stirring system defective
– Connect power supply (small
plug)
– Return the sensor
General features Measuring principle Membrane covered galvanic sensor
Temperature
compensation IMT compensation
(calculated by the meter)
Temperature sensor Integrated NTC 30 (30 k

at 25 °C / 77 °F)