Chapter 3
6. Thread the nozzle on the inlet.
7. Turn on the D
USTTRAK monitor and verify that the flow rate is at 1.7
L/min. You might need to make a small adjustment when you switch
nozzles.
The D
USTTRAK monitor is calibrated to the respirable fraction of ISO
12103-1, A1 (formerly called ultrafine Arizona test dust or SAE ultrafine).
To increase the accuracy while using the inlet conditioners, you will need to
calibrate in the aerosol you wish to test. Please refer to the manual for
calibration details.
Figure 3–3: Installing the 1.0 or 2.5 µm Inlet Conditioners
Because of the much higher percentage of particles being removed from the
stream when using the smaller cut-size inlets, you will need to clean the inlet
more frequently than for the standard 10 µm nozzle (black.) See
maintenance schedule in Chapter 4
for the inlet cleaning frequency.
Using the 10 µm Nozzle
1. Remove the blue nozzle and blue impactor plate.
Note: The blue impactor plate must be removed from the inlet when
using the black nozzle. Performance of the 10 micrometer nozzle
will be severely degraded if the impactor plate is not removed.
2. Thread the black nozzle onto the D
USTTRAK monitor inlet.
3. Verify that the flow rate is at 1.7 L/min.
4. The D
USTTRAK monitor now measures aerosol with an upper particle
size limit of 10 µm.
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