Measuring and testing – Instrument proving or calibrating – Fluid pressure
Patent
1996-07-12
1997-12-02
Raevis, Robert
Measuring and testing
Instrument proving or calibrating
Fluid pressure
73 169, G01L 2700
Patent
active
056938713
ABSTRACT:
A method and apparatus for evaluating low differential pressure transducers includes a pressure generator in the form of a piston-cylinder assembly having a piston that may be manually positioned precisely within the cylinder to change the volume and thus the pressure at respective sides of the piston. At one side of the piston the cylinder communicates with a first chamber and at the other side of the piston the cylinder communicates with a second chamber, the first and second chambers being formed within a common tank by a partition wall. The chambers each communicate with the transducer to be evaluated and a standard pre-calibrated transducer, the transducers being connected fluidly in parallel so that a pressure differential between air in the two chambers resulting from movement of the piston within the cylinder is communicated to both the transducer to be evaluated and the standard transducer, and the outputs of the transducers is observed and recorded.
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Deyoe Richard T.
Stout Stephen J.
Raevis Robert
The United States of America as represented by the Administrator
Vrioni Beth A.
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