AIR PARTICLE SAMPLER NEMS-CLARKE APS-11 The Nems-Clarke APS-11 Air Particle Sam- … turns in ball bearings at a relatively low rate of speed. In place of a rate of flow metering device ordinarily used in units of this type, the APS-11 em- ploys a rugged, reliable metering system which indicates the total volume of air that has passed through the filter during the sampling period.…
