| 摘要 |
An improved primary gas flow calibrator measures the flow rate of a gas source through a fixed volume by monitoring the travel time of a liquid soap film. The device comprises a novel mechanism for generating a single film of soap across a first end of a flow tube and an infrared light beam responsive timing system for determining the speed of a soap film moving through a portion of the flow tube. The device is a microprocessor-based system which comprises settable adjusting DIP switches for avoiding exacting dimensional tolerances of the flow tube during manufacture.
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