Thermal type flowmeter

Details Thermal type flowmeter Thermal type flowmeter

1991-06-10

1993-06-29

Razavi, Michael T.

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

052223957

ABSTRACT:
A heat-conductive stream pipe has an upstream side and a downstream side temperature-sensing element having resistance wires wound round the pipe at a certain distance there-between to assure that there will be no thermal influence with each other. A control means controls a bridge circuit including a ground point at one end and a connecting point at the other end of each of the temperature-sensing elements so as to keep the temperature difference between the upstream side and the downstream side temperature-sensing elements at a constant level. An adjustable auxiliary heater is placed on the stream pipe at the downstream side near the downstream side temperature-sensing element. The mass flow of the fluid is determined by the voltage measured at the connecting point of the downstream side temperature-sensing element.

REFERENCES:
patent: 2552017 (1951-05-01), Schwartz et al.
patent: 2726546 (1955-12-01), King, Jr.
patent: 3020760 (1962-02-01), Schnoll
patent: 3648518 (1972-03-01), Hans et al.
patent: 3827299 (1974-08-01), Welland
patent: 4255968 (1981-03-01), Harpster
patent: 4843881 (1989-07-01), Hubbard

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