Page:NIOSH Manual of Analytical Methods - 0600.pdf/5

 PARTICULATES NOT OTHERWISE REGULATED, RESPIRABLE: METHOD 0600, Issue 3, dated 15 January 1998 - Page 5 of 6

[12]	 Bartley DL, Breuer GM, Baron PA, Bowman JD [1984]. Pump fluctuations and their effect on cyclone performance. Am Ind Hyg Assoc J 45(1): 10–18. [13]	 Briant JK, Moss OR [1983]. The influence of electrostatic charge on the performance of 10-mm nylon cyclones. Unpublished paper presented at the American Industrial Hygiene Conference, Philadelphia, PA, May 1983. [14]	 Koqut J [1994]. Private Communication from MSHA, May 12, 1994. [15]	 Vaughn NP, Chalmers CP, Botham [1990]. Field comparison of personal samplers for inhalable dust. Ann Occup Hyg 34: 553–573. METHOD REVISED BY:

Geometric standard deviation

David L. Bartley, Ph.D., NIOSH/DPSE/ARDB and Ray Feldman, OSHA.

Mass median diameter (µm)

Mass median diameter (µm)

Mass median diameter (µm)

10-mm Nylon cyclone at 1.7 L/min

Higgins-Dewell cyclone at 2.2 L/min

Aluminum cyclone at 2.5 L/min

Figure 1. Bias of three cyclone types relative to the international respirable dust sampling convention.

APPENDIX: Jarless Method for Calibration of Cyclone Assemblies This procedure may be used in the field to calibrate an air sampling pump and a cyclone assembly without using the one-liter “calibration jar”. 1.	Connect the pump to a pressure gauge or water manometer and a light load (adjustable valve or 5-µm filter) equal to 2” to 5” H2O with a “TEE” connector and flexible tubing. Connect other end of valve to an electronic bubble meter or standard bubble tube with flexible tubing (See Fig. 2.1). NOTE:	A light load can be a 5-µm filter and/or an adjustable valve. A heavy load can be several 0.8µm filters and/or adjustable valve. 2.	Adjust the pump to 1.7 L/min, as indicated on the bubble meter/tube, under the light load conditions (2” to 5” H2O) as indicated on the pressure gauge or manometer. 3.	Increase the load until the pressure gauge or water manometer indicates between 25” and 35” H2O. Check the flow rate of the pump again. The flow rate should remain at 1.7 L/min ± 5%. 4.	Replace the pressure gauge or water manometer and the electronic bubble meter or standard bubble tube with the cyclone having a clean filter installed (Fig. 2.2). If the loading caused by the cyclone assembly is between 2” and 5” H2O, the calibration is complete and the pump and cyclone are ready for sampling.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition