X-STREAM
Emerson Process Management GmbH & Co. OHG7-42
Instruction Manual
HASAxE-IM-HS
05/2006
7-4 Replacing the Electrochemical Sensor
7-4-5 Sensor Amplifier Adjustment
Strip P2 for
Oxygen sensor signal
Tp 1
Tp 2
Potentiometer R4
Fig. 7-11: OXS Board, top view
To do so,
• power on the opened instrument.
• Supply gas path with ambient air (approx.
21 % O
2
)
• Connect a digital voltmeter (DVM) to Tp 1
(signal) and Tp 2 (GND) on the electronics
board OXS (fig. 7-11).
• Adjust the measured signal to
3360 mV DC (± 5 mV) utilizing the poten-
tiometer R4 on OXS board.
Note!
Once the output signal has been adjusted for
a specific sensor changing the potentiometer
settings will cause incorrect measuring results!
After having replaced an electrochemical
sensor the related amplifier requires adjust-
ment to achieve proper measurement results.
ELECTRICAL SHOCK HAZARD !
Working at open and
powered instruments
means working near live
parts and is subject to
instructed and trained
personnel only!
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