JUMO 202610.0, Operating Instructions Manual, Page: 59 / 68

59
12 Maintenance
12.2 Replacing the sensor module
When to
replace? - when the membrane is damaged
- when repeated calibration has failed to produce correct calibration results.
Replacing
Removal
✱
Screw off protection basket (1) (1/3 ccw turn to the notch) and remove.
✱
Unscrew union nut (2).
✱
Pull out sensor module (3) from transmitter (5), keeping it straight.
The maximum theoretical life of the sensor module with air
saturation and at 20°C is 5 years.
A grayish-white deposit may form on the anode of the sensor
module. This deposit does
not affect the functioning of the
measuring cell.
After the sensor module has been replaced, the two-wire
transmitter for dissolved oxygen has to be calibrated.
➩
Chapter 10 “Calibration”, page 42ff.
After the sensor module has been plugged on, wait for at least 30
minutes before starting to calibrate.
Reasons: The excess oxygen in the electrolyte has to be reduced
at the cathode first. The temperature has to be compensated.
(1) Protection basket (with optional protective film, if required)
(2) Union nut
(3) Sensor module
(4) Seal
(5) Transmitter
(1)
(2)
(3)
(4)
(5)