TSI Instruments DustTrak 8540, Operation And Service Manual

Page: 70 / 78

60 Appendix C
•
Co-locate and run the gravimetric sample and DustTrak
™
DRX monitor simultaneously to collect enough mass on the
gravimetric filter.
•
Calculate the
PM
10
mass concentration (
PM
10_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
(
PM
2.5
_
DRX
)
and
PM
10
(
PM
10_DRX
) mass concentration from the screen or
though TrakPro
™ Data Analysis Software.
•
Calculate the new SCF
SCF
New
=
(
PM
10_Grav
−
PM
2.5_DRX
PM
10_DRX
−
PM
2.5_DRX
)
1
3
×SCF
Old
.
•
Update the new SCF in user calibration settings.
Option 2: Parallel Gravimetric Calibration
When you have two sets of gravimetric sampling devices, the
DustTrak
™ DRX monitor advanced calibration can be performed in
the parallel configuration as shown in Figure 36b. The calibration
steps are outlined below:
1. Install a
PM
2.5
and a
PM
10
impactor at the inlet of the two external
gravimetric filters, respectively.
2. Co-locate and run the gravimetric samples and DustTrak
™
DRX monitor simultaneously to collect enough mass on the
gravimetric filters.
3. Calculate the
PM
2.5
(
PM
2.5
_Grav
) and
PM
10
(
PM
10_Grav
) mass
concentrations from the gravimetric filters based on the net mass
collected on the filter, sampling time, flow rate, and total liters of
air sampled.
4. Read the DustTrak
™ DRX monitor average PM
2.5
and
PM
10
mass concentration (
PM
2.5_DRX
and
PM
10_DRX
) from the DRX
screen or through TrakPro
™ Data Analysis Software.
5. Calculate the new PCF
PCF
New
=
PM
2.5_Grav
PM
2.5_DRX
×PCF
Old
,
and the new SCF
SCF
New
=
(
PM
10_Grav
−
PM
2.5_Grav
PM
10_DRX
−
PM
2.5_DRX
)
1
3
×SCF
Old
.