SAMPLING:
6. Calibrate each personal sampling pump to the appropriate flow rate with a representative sampler in line.
NOTE 1: Because of their inlet designs, nylon and aluminum cyclones are calibrated within a large
vessel with inlet and outlet ports. The inlet is connected to a calibrator (e.g., a bubble
meter). The cyclone outlet is connected to the outlet port within the vessel, and the vessel
outlet is attached to the pump. See APPENDIX for alternate calibration procedure. (The
calibrator can be connected directly to the HD cyclone.)
NOTE 2: Even if the flowrate shifts by a known amount between calibration and use, the nominal
flowrates are used for concentration calculation because of a self-correction feature of the
cyclones.
7. Sample 45 min to 8 h. Do not exceed 2 mg dust loading on the filter. Take 2 to 4 replicate samples for
each batch of field samples for quality assurance on the sampling procedure (see Step 10).
NOTE : Do not allow the sampler assembly to be inverted at any time. Turning the cyclone to
anything more than a horizontal orientation may deposit oversized material from the cyclone
body onto the filter.