59
Appendix C
DRX Advanced Calibration
The advanced calibration method is employed to yield high size
segregated mass concentration accuracy for
PM
1
.
0
,
PM
2.5
,
Respirable, and
PM
10
size fractions. It involves two gravimetric
measurements to obtain PCF and SCF. The two gravimetric
measurements can be done in sequence or in parallel, depending on
the gravimetric sampling device availability.
Option 1: Serial Gravimetric Calibration
When you have only one set of gravimetric sampling devices, the
DustTrak
™ DRX advanced calibration can be performed in two serial
steps. The experimental setup is in Figure 36a. The calibration steps
are outlined below:
Step 1: PCF Calibration
•
Install a
PM
2.5
impactor at the inlet of the external
gravimetric filter.
•
Co-locate and run the gravimetric sample and DustTrak
™
DRX monitor simultaneously to collect enough mass on the
gravimetric filter.
•
Calculate the
PM
2.5
mass concentration (
PM
2.5_Grav
) from the
gravimetric filter based on the net mass collected on the filter,
sampling time, flow rate, and total liters of air sampled.
•
Read the DustTrak
™ DRX monitor average PM
2.5
mass
concentration (
PM
2.5_DRX
) from the screen or through
TrakPro
™ Data Analysis Software.
•
Calculate the new PCF
PCF
New
=
PM
2.5_Grav
PM
2.5_DRX
×PCF
Old
.
•
Update the new PCF in user calibration settings.
Step 2: SCF Calibration
•
Install a
PM
10
impactor at the inlet of the external
gravimetric filter.
Содержание DustTrak 8540
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