Measuring and testing – Fluid pressure gauge – With pressure and/or temperature compensation
Patent
1978-04-24
1979-12-04
Ciarlante, Anthony V.
Measuring and testing
Fluid pressure gauge
With pressure and/or temperature compensation
73756, G01L 710
Patent
active
041765575
ABSTRACT:
A pressure sensor includes a pressure transducer which has an electrical element therein in the form of a pressure-affected capacitance which is electrically connected to an electronic circuit which is operable to provide an electrical signal representing fluid pressure applied to the transducer. The transducer and the electronic circuit are packaged in a housing and are isolated from each other within the housing by a seal constructed of a material having a very low temperature coefficient of dielectric constant. The housing includes a metal can having a closed end with an aperture therein for connection to a fluid system to be monitored. The electrical leads extending between the pressure sensitive variable capacitance and the electronic circuit extend through the dielectric seal spaced from each other and spaced from the metal can so as to be shielded and prevent stray capacitance from the affecting operation. In one embodiment the metal can is provided with a metal stem having a fluid passageway therein in communication with the aperture and the stem is adapted for mounting to a support. In another embodiment, the metal can is covered with an insulating jacket to provide thermal insulation and minimize heat transfer between the sensor and the environment thereof. The jacket is provided with the stem, which in this embodiment is made of material which is a poor conductor of heat, and the stem incorporates the passageway in communication with the aperture in the can. Each of the chambers defined on opposite sides of the seal in the can is provided with a heater. A thermostatic heater control circuit is mounted on a base which seals the open end of the can and which carries electrical terminals for connection to an electrical supply and to electrical circuits which utilize the electrical output signal of the sensor.
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patent: 3318138 (1967-05-01), Rolfson
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patent: 3602047 (1971-08-01), Kistler
patent: 3808480 (1974-04-01), Johnston
Arbuckle F. M.
Bunker Ramo Corporation
Ciarlante Anthony V.
Lohff William
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