AMC-200 Transmitter
9
Figure 5: Calibration/verification set-up procedure.
5.2.3 ADJUSTMENTS
For full recalibration adjustments, follow the Set-Up Procedure steps 1 to 6 inclusive. There are
two adjustments to be made for recalibration, Zero and Span.
Zero: When there is no gas present (clean air), the transmitter signal should be 4 mA.
This is obtained by adjusting the Zero trimmer on the transmitter. It is possible,
with certain conditions, that the “Zero” current will go below 4 mA.
Span: When the sensor is exposed to the calibration gas sample, adjust the
span trimmer on the transmitter to set the output current proportional to
the gas concentration applied.
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