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How to Apply a
Correction Factor
Thermo Fisher Scientific
If desired, the ADR-1500 can be calibrated gravimetrically for a particular
aerosol (dust, smoke, mist, etc.), other than SAE Fine, under field
conditions (actual conditions of use). To effect such calibration in the
particle environment of interest, proceed as indicated below:
Place the ADR-1500 within the particle environment.
●
Start a run.
●
After 1-minute, record the time weighted average (TWA).
●
Calculate the run time (t) necessary to collect at least 1 milligram of
●
sample using the following equation:
500
t
TWA
For example, if the 1-minute TWA = 2.5 mg/m
collect approximately 1 mg of sample equals 200 minutes (i.e., t = 200
minutes).
Now that the run time (t) has been calculated from the above 1-minute
preliminary test, proceed with the following steps using the optional 37-
mm filter assembly:
Perform a tare weight on a fresh 37-mm filter using a microbalance
●
with at least a 0.001 mg resolution and place into the filter assembly.
Record the tare weight (m
●
Load the filter assembly into the ADR-1500 in place of the large
●
capacity HEPA filter.
Place the ADR-1500 within the particle environment of choice
●
Start a run using a 1-minute data logging.
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Allow the ADR-1500 to run for the run time calculated from the
●
preliminary test (e.g., t = 200 minutes).
At the end of the run, record the TWA (mg/m
●
and flow rate (LPM).
Stop the run.
●
Recover the 37-mm filter assembly from the instrument and return to
●
the microbalance room for weighing.
Remove the 37-mm filter from the assembly, and weigh the filter after
●
equilibration and anti-static neutralization, as necessary.
Calibration and Particle Size Selection
3
, the run time necessary to
).
1
3
) run time t (minutes)
MIE ADR-1500 Instruction Manual
4-3
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Troubleshooting
