PCF= Photometric Calibration Factor
Reference Concentration = Average Gravimetric Concentration
Data Log Concentration = Average Photometric Concentration
ECF = Existing Calibration Factor (by
default Factory calibration is 1.0)
π·πͺπ =
πΉππππππππ πͺππππππππππππ
π«πππ π³ππ πͺππππππππππππ
Γ π¬πͺπ
10. Enter new Photometric Calibration Factor into the photometer.
11. Repeat the co-located, paired sampling process using new PCF
setting in photometer.
Conducting at least one additional pair-sample set using the
new PCF will help to verify the photometric calibration factor is
applicable to the reference aerosol.
12. Compare gravimetric and PCF photometric sample data.
β’ Results should be closer, βmore accurate,β using the
new PCF.
Greater accuracy will be obtained with longer samples. The time
you permit for sampling often depends on the reference instrument
and characteristics of the measured aerosol. It may take some time
to collect sufficient aerosol onto a filter cassette for accurate
gravimetric analysis. Refer to instructions of your reference
instrument for sampling times.
Determining the Response Factor for a
Specific Aerosol
In addition to the Photometric Calibration Factor (PCF) the User
Calibration Factor includes a Response Factor (RF). The RF is
specified as a percentage of the mass concentration being measured.
This percentage is multiplied by the mass concentration during
sampling to allow the operator to better estimate the concentration of
a unique hazard.
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