TY - JOUR
AU - WHITELAW, D. G.
AB - Abstract The paper describes a method of measuring the dust protection of a helmet respirator, such as the ‘Airstream’ Dust Helmet, and two methods of measuring the airflow. Dust protection is measured by placing the helmet on a dummy head mounted in a test chamber and exposing it to an aerosol of fine sodium chloride particles. Air is drawn through an orifice in the dummy's ‘mouth’ to simulate breathing. The aerosol is sampled inside and outside the helmet. In one method of measuring the airflow, a variable-flow pump is used to overcome the resistance of a flow meter; the pump output is adjusted until the air entering the respirator is at atmospheric pressure and the helmet is then considered to be operating as it would be with the measuring equipment removed. The second airflow measuring technique uses a perforated ‘flow-plate’ which is drawn against the helmet air intake by the airflow. By adjustments to its weight and airflow resistance, a flow-plate can be made to remain in place at an airflow above a predetermined minimum and hence indicate the correct functioning of the helmet. This content is only available as a PDF. © British Occupational Hygiene Society
TI - MEASUREMENT OF THE DUST PROTECTION AND AIRFLOW OF A HELMET RESPIRATOR
JO - Annals of Work Exposures and Health (formerly Annals Of Occupational Hygiene)
DO - 10.1093/annhyg/23.3.295
DA - 1980-01-01
UR - https://www.deepdyve.com/lp/oxford-university-press/measurement-of-the-dust-protection-and-airflow-of-a-helmet-respirator-49koP40bVF
SP - 295
EP - 304
VL - 23
IS - 3
DP - DeepDyve
ER -