Measuring and testing – Volume or rate of flow – Proportional
Patent
1983-03-30
1984-12-11
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Proportional
73204, G01F 168
Patent
active
044870620
ABSTRACT:
An improved mass flowmeter of the type having a primary passage for the fluid whose flow rate is to be measured, a sensor tube which serves as a secondary passage for the fluid and is connected to the primary passage at upstream and downstream locations, and a pair of resistance wire coils surrounding the sensor tube and connected to a bridge circuit in which the resistance differential between the wire coils is proportional to the fluid flow rate. The sensor tube is a straight tube displaced from the primary passage and accessible at its ends for cleaning. The wire coils and the corresponding portion of the sensor tube are surrounded by an evacuated enclosure to prevent convection effects between the adjacent coils, to maximize the response time of the coils to changes in fluid flow rate, and to reduce conduction losses.
REFERENCES:
patent: 1252656 (1918-01-01), Breen
patent: 2586060 (1952-02-01), Kronberger
patent: 2813237 (1957-11-01), Fluegel
patent: 3187569 (1965-06-01), Los
patent: 3613448 (1971-10-01), Benson et al.
patent: 3938384 (1976-02-01), Blair
patent: 4016759 (1977-04-01), Baker
patent: 4098119 (1978-07-01), Coats
Korpi David M.
Olin John G.
Goldstein Herbert
Harrison Michael L.
Sierra Instruments, Inc.
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