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CIH uses the MESA Laboratories ML800 primary piston prover for unmatched accuracy. The ML-800 is a positive displacement primary piston prover for gas flow measurements in either pressure or vacuum applications. Using Proven DryCal Technology, it combines the accuracy of a primary standard with unequaled speed and convenience. Volumetric or standardized flow readings are obtained with the push of a button. The ML-800 can be set to take flow readings manually, (one reading at a time), or automatically in the continuous auto-read mode. The ML-800 can be programmed for up to 100 readings in an averaging sequence.
According to OSHA and NIOSH sampling and analytical guides, establishing the correct volume of air through a filter or sorbent media is essential for a more accurate calculation of concentration. The flow rate of an air sampler is calibrated with the sampling media in line using a field flow calibrator. Some air samplers have a built in calibrator or the use of dry piston prover field calibrator. The flow should be checked before and after each sample. IF the volumetric flow uncertainty is known, concentrations can be ultimately presented as data in lower and upper confidence limits. This will provide better data for OSHA compliance and engineering controls. Many of the calibrators come in reading modes of single, continuous, and burst.