21. Maintenance of the analyser
21.1. Life-time of the sensors
Sensors are electrochemical type: inside them, in the presence of gas to detect, a chemical reaction occurs that causes an emission of
electrical current. The electric current strength detected by the instrument is converted into a corresponding gas concentration. The
life-time of the sensor is strongly linked to the reagent consumption present in the sensor. As their consumption increases, features of
the sensor are getting worse until their exhaustion, after which it is necessary to replace it. To ensure the measurement accuracy,
sensors have to be calibrated only in Assistance centre qualified by Kimo.
Sensor Average life-time Required calibration
Long-life O
2
5 years Annual
CO-H
2
2 to 3 years Annual
NO 2 to 3 years Annual
CH
4
3 to 5 years Annual
21.2. Replace the sensors
Follow this procedure to replace a used sensor:
The analyser must be turned off.
➢ Remove the protective cover.
➢ Turn the analyser.
➢ Unscrew the sensors cover with a cross-head screwdriver.
➢ Remove the trap.
➢ Disconnect the ribbon cable of the sensor to replace.
➢ Rotate the sensor counter clockwise taking care not to bring pressure on the board of the sensor.
➢ Remove the sensor.
➢ Put the new sensor taking care to insert the two jacket hooks of the sensor in their location.
Exercise the rotation constraint on the sensor body and not on the electronic card.
➢ Rotate the sensor clockwise.
➢ Reconnect the ribbon cable of the sensor.
1
Maintenance of the analyser 39
1 2
3
4
Board
Jacket
hooks
Sensors access
Disconnection of the
ribbon cable of the sensor
to replace
Sensor rotation Remove the used
sensor
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