Correlation of the Fibrous Aerosol Monitor With the Optical Membrane Filter Count Technique.
The Bureau of Mines used fiber-laden air to test two identical fibrous aerosol monitors (fam) in order to establish the fam-optical count correlation. The fam is a unique instrument developed by GCA Corp. (GCA) to measure real-time fibrous aerosol concentrations. Results of the Bureau's laboratory tests showed that the fam response is linearly correlated to concentration data obtained using the optical membrane filter count technique. A plot of the fam- optical count correlation showed that fam concentration readings are generally well within +/-25 pct of the optical membrane filter count. Initial tests to estimate the best ratio control setting of the fam for 5-um fiber-length discrimination were performed using one instrument only (the ratio control setting determines the minimum threshold fiber length that will be detected by the fam). The estimated setting was then used to correlate both fam units. The result was a 65-pct difference in correlation between the two units.
IH; Report of Investigations