CALIBRATING GAS SENSORS
Part. No. 2400M2501_6 Touchpoint Pro
64 Technical Handbook
10. Replace the Span Gas Concentration default value (50% FSD in the example below) with the required figure:
a) If carrying out a loop calibration by forcing the output this will typically be 100% FSD, corresponding to 20mA.
b) If carrying out a direct gas calibration of a sensor, enter the span gas concentration to be used, normally from
the cylinder label.
11. Select Accept
Figure 78. mA Span Calibration
12. When ready select OK and generate an equivalent gas reading at the sensor, either by forcing a value at the
transmitter or applying span gas to the sensor.
13. View the signal reading until it is stable, and then select Accept
14. Confirm that the reading is correct, and select Save then OK
15. Return the sensor to normal operation, and confirm that the signal has returned to zero
16. Select Clear inhibit to remove the channel inhibit
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