Testing apparatus for pressure gauges implementing pneumatic feedback to control stepless regulating valve
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United States of America Patent
Stats
-
Oct 31, 1995
Grant Date -
N/A
app pub date -
May 5, 1994
filing date -
Oct 14, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A testing apparatus for in situ calibration of various types of pressure gauges is provided for measuring absolute pressure, manometric pressure or differential pressure. The apparatus includes a reference chamber where a desired pressure can be established with very high accuracy. Pressure regulation is based on an output signal from a calibrated electronic pressure sensor connected to the reference chamber, and on a reference signal (V.sub.ref), these signals being supplied to an electronic control circuit which controls a regulating valve. The regulating valve controls gas pressure within the reference chamber so that the pressure is established on the desired valve.
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