2
Adjustment
Electro-chemical sensors must have operated for approx. 1 hour before the adjustment can be
performed.
The calibration gas must have the same temperature as the surrounding area, i.e. the same
temperature as the sensor
Measurement Equipment
Voltmeter 0-2 V
Screwdriver
Zero gas (synthetic air)
Calibration gas (C2H2 5000ppm)
Gas supply equipment (flow regulator, flow meter 0-1 litre/minute)
Gas supply pipe connection
The adjustment is performed as follows:
Zero balance
The balance is performed at the sensor
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Unscrew the cap from the sensor
-
Connect a digital voltmeter to the measurement pins “MP” (measurement range 0 - 2 V)
-
Connect the testing pipe connector to the filter
-
Add a zero gas concentration (synthetic air)
-
The gas flow should be 0.5 litres/minute
-
The gas temperature should have room temperature
-
Now set the voltage with the trimmer “NP” to 0.04 V.
4-20mA balance with calibration gas supply
The balance is performed at the sensor
-
Connect a digital voltmeter to the measurement pins “MP” (measurement range 0 - 2 V)
-
Connect the calibration gas pipe connector to the filter
-
Add a gas concentration (max. measurement range).
-
The gas flow should be 0.5 litres/minute
-
The gas temperature should have room temperature.
-
Now set the voltage with the trimmer “V” to 0.2 V (Gas concentration = measurement range).
