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117-121. 1973.-A calibration procedure for the heated Fleisch pneumotachometer (PTM) is presented. Taken into account are the influence of gas viscosity and PTM case temperature on re-sistance to gas flow through the PTM according to Poiseuille’s-law. In addition, a temperature change coefficient has been em-pirically determined for a no. 1 Fleisch PTM which permits estimating average gas temperature within the PTM from knowl-edge of gas temperature entering the PTM, PTM case tempera-ture, and uncorrected estimate of flow. This permits correcting viscosity estimates for temperature at the point where flow is being measured, i.e., within the PTM, and also permits more accurate correction of gas volume by Boyle’s law. This calibration scheme is best suited to an application where there is continuous measure-ment of gas composition, as with a mass spectrometer, and com-puter acquisition of analog flow, pressure, gas concentration, and
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Turney et al. (1973) studied this question.
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