Simplified pressure method for respirator fit testing.
Simplified pressure method for respirator fit testing.
复制标题
呼吸器适合性测试的简化压力法。
DOI：
10.1080/15298669191364776
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Willeke,K
中科院分区：
文献类型：
--
作者：
Han,D;Xu,M;Foo,S;Pilacinski,W;Willeke,K
A simplified pressure method has been developed for fit testing air-purifying respirators. In this method, the air-purifying cartridges are replaced by a pressure-sensing attachment and a valve. While wearers hold their breath, a small pump extracts air from the respirator cavity until a steady-state pressure is reached in 1 to 2 sec. The flow rate through the face seal leak is a unique function of this pressure, which is determined once for all respirators, regardless of the respirator's cavity volume or deformation because of pliability. The contaminant concentration inside the respirator depends on the degree of dilution by the flow through the cartridges. Tile cartridge flow varies among different brands and is measured once for each brand. The ratio of cartridge to leak flow is a measure of fit. This flow ratio has been measured on human subjects and has been compared to fit factors determined on the same subjects by means of photometric and particle count tests. The aerosol tests gave higher values of fit.
