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LAMINAR FLOW ELEMENT: ITS USE AS A FLOW STANDARD
Citation:
Barnard, W.F. LAMINAR FLOW ELEMENT: ITS USE AS A FLOW STANDARD. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-89/176 (NTIS PB90129677).
Description:
A standard device to measure flows accurately and precisely was required by the U.S. Environmental Protection Agency (EPA) to establish an air pollution field auditing system capable of generating pollutant concentrations in the parts per million and parts per billion range. he establishment of a standard normally requires the device possess accuracy and precision specification at least an order of magnitude (one decade) better than the devices to be calibrated. n the measurement of low flows (less than 20 liters per minute) there are many devices capable of 1-2 percent accuracies. his figure generally represents a percentage of full scale. hen properly calibrated, the laminar flow element (LFE) is capable of obtaining accuracies better than .3 percent of reading. The LFE's characteristics, calibrations, limitations, and usage in EPA's National Performance Audit Program are presented.