Measuring and testing – Volume or rate of flow – Thermal type
Patent
1977-02-25
1978-06-27
Queisser, Richard C.
Measuring and testing
Volume or rate of flow
Thermal type
73 3, 73 231, 137501, G01F 134, G01F 2500
Patent
active
040967468
ABSTRACT:
There is disclosed a flow controller-flow sensor combination especiably suited for gas chromatograph applications wherein a transducer monitors the pressure at the inlet and outlet of a flow restrictor element in the controller thereby to monitor the differential pressure across the restrictor; the differential pressure being proportional to the gas velocity through the flow restrictor element. In one form of the invention, a second flow restrictor element is provided in one input line to the transducer which preferably is of relatively low impedance in order to delay the buildup of the pressure head of the corresponding input of the transducer sensor, thus to enable the pressure at the outlet of the flow restrictor in the controller to buildup gradually so as not to exceed the maximum differential pressure specifications for said transducer.
REFERENCES:
patent: 1640842 (1927-08-01), Loomis
patent: 1699676 (1929-01-01), Rush
patent: 2182873 (1939-12-01), King
patent: 2711187 (1955-06-01), Bowditch
patent: 2862162 (1958-11-01), Baring
patent: 3078713 (1963-02-01), Schlieder
patent: 3792609 (1974-02-01), Blair et al.
Purcell John E.
Wilson Francis P.
Giarrantana Sal A.
Grimes Edwin T.
Kreitman Stephen A.
Masselle Francis L.
Queisser Richard C.
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