Measuring and testing – Fluid pressure gauge – With protective separator
Patent
1992-04-14
1994-02-22
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
With protective separator
73720, 73726, 73756, G01L 708, G01L 900
Patent
active
052877469
ABSTRACT:
A transmitter with a flame arresting header senses a pressure of a process fluid with a diaphragm which is sealed to the header. The diaphragm transfers the pressure of the process fluid acting an outer surface of the diaphragm to a fill fluid that isolates an inner surface of the diaphragm, and a pressure sensor enclosed in the transmitter senses the pressure of the fill fluid providing an output representative of the pressure of the process fluid. The header includes a chamber on the header's outer face and a passageway extending from the chamber to a tapered opening inside the transmitter with a first portion adjacent to the tapered opening shaped to receive an inlet tube leading to the sensor and a second flame isolating portion open to the chamber. The fill fluid fills the chamber, the passageway, and the inlet tube and is sealed in with a tapered seal pressed into the tapered opening around the inlet tube. The second passageway portion is shaped for flame isolating the tapered seal from the process fluid.
REFERENCES:
patent: 3851530 (1974-12-01), Symonds et al.
patent: 4833922 (1989-05-01), Frick et al.
patent: 4970898 (1990-11-01), Walish et al.
Rosemount Inc.
Woodiel Donald O.
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