Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1989-05-25
1990-06-19
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
73706, 338 4, G01L 708, G01L 906
Patent
active
049341936
ABSTRACT:
A pressure sensing transmitter comprises a housing, a sensor base, a ceramic sensor, thick film resistor members, an isolation diaphragm, and an isolation fluid. A sensing surface contacting with the isolation fluid is formed with a spherical surface form, the thick film resistor members are sintered on a sintering surface of an opposite side against the sensing surface projection area, and a test fluid flow is isolated from the sensing mechanism by a metal diaphragm so that a process fluid pressure is transferred indirectly to the sensing element. According to the invention, since each of the thick film resistor members 14A and 14B are sintered at both the interior and exterior of the sensing surface projection area 13C, a sintering area can be made larger than that of a conventional one, so that a larger output can be maintained without losing any characteristic of the thick film resistor member. This arrangement also provides a higher degree of precision, long life stability, as well as increased safety and reliability.
REFERENCES:
patent: 4502335 (1985-03-01), Wamstad
R. J. Holmes, "Changes in Thick Film Resistor Values Due to Substrate Flexure Announcement", issued Oct. 1973, published in Microelectronics and Reliability, vol. 12, No. 4.
Bailey Japan Co., Ltd.
Woodiel Donald O.
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