Fluid mass flow meter device with reduced attitude sensitivity

Details Fluid mass flow meter device with reduced attitude sensitivity Fluid mass flow meter device with reduced attitude sensitivity

1992-07-10

1993-03-09

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

7320425, G01F 168

Patent

active

051917939

ABSTRACT:
Reduced attitude sensitivity is achieved in a fluid mass flow meter of the type which determines fluid flow from the temperature difference between an upstream sensor and a downstream sensor positioned along the flow path of the fluid externally of a sensing conduit for the fluid. A housing, taking particular forms, has wall structure spaced along the sensors adapted to substantially limit the ambient gaseous atmosphere along the sensors to a thin film. The housing wall structure further is spaced along portions of the sensing conduit between the sensors and the input and output ports of the conduit to substantially limit the ambient gaseous atmosphere along such portions to a thin film. In one form, such wall structure, along these portions, converges from both directions along the conduit, to provide support regions for the conduit. The sensors, specifically, are self-heating coil elements formed of temperature-sensitive resistance wire wound around the outside of the sensing conduit. They are incorporated into a bridge-type circuit for sensing their temperatures.

REFERENCES:
patent: 2729976 (1956-01-01), Laub
patent: 3938384 (1976-02-01), Blair
patent: 4056975 (1977-11-01), LeMay
patent: 4517838 (1985-05-01), Wachi et al.
I. Langmuir, "Convection and Conduction of Heat in Gases", The Physical Review, vol. 34, No. 6, Jun. 1912, pp. 401-422.

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