Chapter 3
18
Size Corr
Changes the factory calibration of the
particle distribution, based on Arizona
Road Dust, to actual aerosol being
measured. See below for sets to set this
calibration.
User Cal [on,off]
Selecting On will activate current user
calibration and deactivate the previously
selected user calibration.
The Size and Photometric Calibration factors can be determine using a
standard or advanced calibration method. The standard method is quick and
easy to perform and works well in most situations. That method is shown
below. The advanced method will give the tightest accuracy and is described
in Appendix B
.
Standard Calibration Method—Size Correction Factor
The size correction factor is used to improve the relative accuracy between
the 5 mass channels (PM
1
, PM
2.5
, Resp, PM
10
, and Total). The instrument
has been optimized in the factory calibration to standard ISO 12103-1, A1
test dust (formerly Arizona Test Dust).
Following the steps below, a size correction factor can be determined for the
aerosol of interest to better optimize the 5 mass channels relative accuracy.
Note: The 2.5 µm inlet impactor should be clean before performing the
shape calibration. The cleaning procedure is details in the
Maintenance
section of this manual.
1. Select Size Corr from the drop down list.
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