Air velocity transmitter device

Details Air velocity transmitter device Air velocity transmitter device

1988-05-27

1989-08-29

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

7320418, G01F 168

Patent

active

048605832

ABSTRACT:
An instrument probe has two sensing elements; one is a self heated thermistor that serves as the air velocity sensor, and a second sensing element in the form of a chip thermistor, that are separately but simultaneously exposed, in the use of the instrument probe, to the air flow, with the self heated thermistor and the thermistor chip are incorporated in a self regulating bridge circuit, that, when the unit is powered, generates a non-linear signal that is applied to signal processing circuitry within the unit housing to adjust same for gain and off set with the resulting signal being applied to a linearizer circuit also within the unit housing wherein the signal is electronically processed to supply the unit output signal in the familiar 4-20 milliamp range. The transmitter device is arranged to be powered by either an alternating current or direct current supply that is in the range of about 22 volts to about 28 volts.

REFERENCES:
patent: 3363462 (1968-01-01), Sabin
patent: 4475388 (1984-10-01), Kawai et al.
patent: 4537068 (1985-08-01), Wrobel et al.
patent: 4627279 (1986-12-01), Ohta et al.
patent: 4718279 (1988-01-01), Hestich

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