Without measurement there is no control
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Page 3
As an example, a 0 - 50 ppbv Amines analyzer would be span calibrated at 25 ppbv. The span
calibration provides a correction factor to adjust the calibration curve appropriately.
Because most users are sampling in a wet environment (where the RH > 5%), a wet span calibration is most
appropriate. The wet span calibration is accomplished with the Calibration Station by using chemically
filtered ambient air for the dilution gas. The following table details the best method for zero and span
calibration.
Calibration Type
Ammonia/Amines
Acids
Zero Calibration
Dry
Dry
Zero Calibration
Wet
Wet
Table 1
Zero and Span Calibration
Rocker Buttons on the AirSentry II Calibration Station
The configuration of the rocker buttons on the left front panel of the calibration station determines the
calibration gas output. Based on the rocker button settings, the calibration station will output a dry zero
calibration stream, a wet zero calibration stream, or a wet span calibration stream to the zero/calibrate
fitting at the back of the calibration station.
A schematic of the internal components of the calibration station is located on page 9.
Figure 2. Calibration Station: Rocker buttons
