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CHECK AND REPLACEMENT OF ELECTROCHEMICAL OXYGEN SENSOR
18 - 2
ETC00303(1) BINOS E e (2.0) 11/00
Rosemount Analytical
CHECK OF SENSOR
Fig. 18-1: PCB “OXS”, assembled, horizontal projection
18.1 Check of the Sensor
Exchange the sensor, if the voltage is less than 70 % of the initially output voltage.
The check requires a digital voltmeter (DVM) with a range of 2 V DC.
❍ Remove front panel (see 15.).
❍ Switch on the analyzer (see Section 6.).
❍ Admit ambient air to the analyzer (approx. 21 Vol. - O
2
).
❍ Connect the DVM to the measuring points
Tp 1 (Signal) and Tp 2 (
⊥⊥
⊥⊥
⊥ ) of the PCB OXS, mounted directly at the connection block
(Fig. 18-1, see also Fig. 18-2, 1-3, 1-16a and 1-17).
The measuring signal should be into a range of 700 mV DC to 1000 mV DC.
Note !
If the measuring value is lower than 700 mV at gas flow with ambient air, the sensor is
consumed.
Exchange the sensor.
Tp 1
Tp 2
Potentiometer “R4”