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CHECKING AND REPLACING AN ELECTROCHEMICAL OXYGEN SENSOR
25 - 2
ETC00781(4) Series 100 e 02/2004
CHECKING THE SENSOR
Fig. 25-1: PCB “OXS”, assembled, horizontal projection
25.1 Checking the Sensor
Replace the sensor, if the voltage is less than 70 % of the initial output voltage.
The check requires a digital voltmeter (DVM) with a range of 5 V DC.
P Open the housing (see chapter 23.).
P Switch On the analyzer (see chapter 6.).
P Supply ambient air to the analyzer (approx. 21 Vol. - O
2
).
P Connect the DVM to the measuring points
Tp 1 (Signal) and Tp 2 (
⊥⊥
⊥⊥
⊥ ) of the PCB OXS, mounted directly at the connection block
(Fig. 25-1, see also Fig. 25-2, 1-11, 1-13, 1-15 to 1-17 and 1-19).
The measuring signal should be in a range of 2,4V DC to 3,36 V DC.
Note !
If the measuring value is lower than 2,4V at gas flow with ambient air, the sensor is consumed.
Replace the sensor.
Tp 1 Tp 2