The AIR XD offers two 4 - 20 mA outputs. Each 4 - 20 mA output requires two parameters to be selected and configured to determine the functionality of each analogue output.
1. Assigned a PM size/channel (PM1.0, PM2.5, PM4.25, PM10.0 and TSP)
Select one of the four configured PM sizes or TSP as the alarm source.
2. Assigned a data channel (“Live”, “Average 1” or “Average 2”)
Select one of the three data sets to assign the selected 4 - 20 mA output to.
3. Assigned the full-scale range of the channel
A full-scale range of 2,000 μg/m3, for example, will output 20 mA for a value greater or equal to 2,000 μg/m3, and a value of 0 μg/m3 will always have an output of 4 mA.
4. “Enable”/“Disable” the channel
A disabled channel will output 0 mA.
During instrument start up and initialisation, each 4 - 20 mA output will perform a calibration routine, which involves sweeping the output from 0 - 20 mA before returning to 4 mA. After this has been completed, the output will return to configured functionality.
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