AMC 210 Series Anleitung Handbuch - Seite 16

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AMC-210 Transmitter with external electrochemical sensor

5.2.3 RECALIBRATION

For full recalibration adjustments, follow the Set-Up procedure steps 1 to 9 inclusive. There are

two adjustments to be made for periodic recalibration: Zero and Span.

Zero:

With the sensor in Zero Gas, the transmitter output signal current should read 4 mA.

This is obtained by adjusting the Zero trimmer on the transmitter for a voltage of

0.000 VDC at the test points in Figure 6. It is possible, under certain conditions that

the Zero current will fall below 4 mA.

Span:

While the sensor is exposed to the calibration gas sample, adjust the Span trimmer on

the transmitter to set the transmitter output signal current proportional to the applied

gas concentration.

FIGURE 6: Calibration/Verification Set-up