Pressure measuring device
AssigneeUnited Technologies Corporation
InventorsCarl S. Dudash, Brian G. Donnelly
Life of this patent
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Abstract
A pressure measuring device is provided with an indicator such as a bourdon tube (10) for indicating the absolute value of the difference in pressure between fluids applied to the indicator through first and second conduits (15) and (20). Valve means (25) including an element (100) actuable in response to the pressure in conduits (15) and (20) consistently applies the higher pressure fluid to that portion of the indicator adapted to receive such higher pressure fluid and the lower pressure fluid to that portion of the indicator adapted to receive the lower pressure fluid. Optical means such as transmitter (115) and receiver (120) are provided for indication of the sign (positive or negative) of the pressure difference.
Claims6
A device for measuring the difference in pressure between a higher pressure fluid and a lower pressure fluid, said pressure measuring device comprising an indicator including first indicator means adapted to be pressurized with said higher pressure fluid, second indicator means adapted to be pressurized with said lower pressure fluid, said first and second indicator means indicating the absolute value of said pressure difference, said pressure sensor being characterized by:
- a first conduit for supplying one of said fluids to said indicator;
- a second conduit for supplying the other of said fluids to said indicator;
- and
- valve means in fluid communication with said first and second indicator means and with said first and second conduits, said valve means being actuable by said pressure difference between said first and second fluids to consistently place said first indicator means in fluid communication with said higher pressure fluid and said second indicator means in fluid communication with said lower pressure fluid.
Dependencies are inferred from the claim text.