| 摘要 |
A rapid response air velocity measuring system having a shunting probe adapted to be placed into a flow of air and coupled to a measuring apparatus, such as an air flow meter. A handle portion as constructed to receive the shunting probe as well as other forms of probes, such as diffuser probes, and couple the probe to the measuring apparatus. A range adjusting switch is mounted in the handle portion and places one of a plurality of resistances, in the form of one of a plurality of needle valves, into the path of the air flow trough the measuring apparatus. Push button vent means also is carried in the handle portion for enabling the system to employ diffuser as well as shunting probes. The probes are fine tuned and specially calibrated to a pitot standard, then the probes, the range adjusting switch, and the measuring apparatus are calibrated to the pitot standard as a system. Once calibrated, the individual elements of the system are interchangeable with the corresponding elements of similarly pitot-calibrated, mass produced systems, without requiring subsequent recalibration of each system.
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