Calorimetric flow monitor

Details Calorimetric flow monitor Calorimetric flow monitor

1975-09-18

1977-06-07

Goldstein, Herbert

Communications: electrical

Systems

Call station

73204, G01F 168, G08B 1900

Patent

active

040286894

ABSTRACT:
A calorimetric flow monitor comprising a measuring head adapted to be connectable to a pipe carrying a flow medium. The measuring head includes two thermistors, one of which is surrounded by a heating coil to be heated thereby. The unheated thermistor and the heatable thermistor together with its heating coil are mounted in a pair of pins protruding from the measuring head.
The thermistors are connected in an electrical bridge circuit. A first differential amplifier for determining increases and decreases in the flow of the medium relative to a preset flow is connected to the bridge circuit. Visual indicating devices are optionally provided to indicate when the flow is above and below the preset flow. A second differential amplifier for monitoring the occurrence of breakages in conductors connected to the thermistors and the heating coil, is also connected to the bridge circuit.

REFERENCES:
patent: 3094393 (1963-06-01), Sieger
patent: 3246515 (1966-04-01), Martino
patent: 3400582 (1968-09-01), Warner
patent: 3494196 (1970-02-01), Moussette
patent: 3603955 (1971-09-01), Levy
patent: 3617879 (1971-11-01), Mugnier et al.
patent: 3641546 (1972-02-01), Blackburn
patent: 3755801 (1973-08-01), Milo
patent: 3781839 (1973-12-01), Bodge

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