Without measurement there is no control
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To perform a zero calibration:
1.
Verify that all utilities are connected and working properly for both the calibration station and the
AirSentry II IMS.
Note The best way to set the CDA pressure to 5 psi is to connect the AirSentry II IMS via
the Service Software. The Press CDA column, located on the Control tab, digitally
indicates the CDA pressure in kilopascals. Adjust the regulator until this value
reads 34.5 kPa (± 1.5 kPa), which is equivalent to 5 psi.
2.
Verify that the AirSentry II IMS has a source of vacuum installed on the vacuum fitting (33kPa
(Absolute).
3.
Verify that the calibration station ZERO/SPAN fitting is connected to the SAMPLE fitting on the
AirSentry II IMS. This ZERO/SPAN fitting should have a “T” to allow venting of the excess flow, so
that the IMS cell remains at atmospheric pressure. A 12” service loop of ¼” (quarter-inch) PFA tubing
should be connected on the “T” at the ZERO/SPAN fitting for exhaust purposes.
4.
Verify that the calibration station SPAN VENT fitting is not blocked.
5.
Place the rocker buttons in the correct configuration for the type of zero calibration required.
Note For a dry zero calibration, the rocker buttons should be in the STANDBY and ZERO
positions.
6.
Allow the system to stabilize for 30 to 60 minutes.
7.
Press the
Zero
button on the AirSentry II IMS. The instrument will now begin the zero calibration
process.
You are now ready to perform a span calibration (outlined in the next section).
