Measuring and testing – Volume or rate of flow – Thermal type
Patent
1982-07-12
1984-08-14
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
044649320
ABSTRACT:
Metering and related control of fluid flow are achieved both accurately and at high response speed by way of a unique sequencing of thermal exchanges with the fluid under closely-regulated and inter-dependent thermal conditions. The flowing fluid is first conditioned by being raised to a temperature above its highest anticipated ambient, preferably by way of a temperature-sensitive electrical heater resistance which is part of an exceptional self-balancing bridge and control-loop network, and the conditioned fluid is then similarly increased to yet higher temperature, with measurements related to energy involved in producing the second temperature increase being used to characterize the flow. When the fluid is at the same time further conditioned immediately downstream by another similar heating arrangement which allows the fluid to cool to between temperatures developed by the earlier sequencing, the measurements are rendered more stable and can advantageously be made more linearly proportional to mass flow rate. Additional isolation from ambient temperature disturbances is promoted by controlling the environment within which the sequencing of thermal exchanges takes place, preferably by way of a heated enclosure in which electrical regulation of temperature is also swift and exact.
REFERENCES:
patent: 2994222 (1961-08-01), Laub
patent: 3352154 (1967-11-01), Djorup
patent: 3680377 (1972-08-01), Lightner
patent: 3938384 (1976-02-01), Blair
patent: 3942378 (1976-03-01), Olmstead
patent: 4043196 (1977-08-01), Trageser
Ewing James H.
Ramberg Fred G.
Goldstein Herbert
MKS Instruments Inc.
Mrose James E.
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