Air flow monitor and temperature compensating circuit therefor

Details Air flow monitor and temperature compensating circuit therefor Air flow monitor and temperature compensating circuit therefor

1989-05-17

1991-01-08

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

981153, G01F 168, F24F 1104

Patent

active

049826050

ABSTRACT:
A temperature compensated air flow monitor which measures true flow velocity or volume flow. The air flow monitor can be mounted in or coupled to a fume hood and includes a fluid flow tube having a pair of thermistors mounted therein. A first cold thermistor is utilized to provide temperature compensation to the second hot thermistor which provides the fluid flow velocity measurement. The pair of thermistors can be mounted to or in a probe for a portable air flow monitor application. The measured flow velocity or volume flow can be utilized in a display for the operator and also can activate one or more alarms when the flow velocity varies from a desired range.

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Brochure: Hoffman Controls Corp., "Electronic Laboratory/Fume Hood Controller", 1/84, 4 pages.
Brochure: Hamilton Industries, "Safeaire.TM. Fume Hoods, Accessories", 11/86, 1 page.
Brochure: TSI Inc., "TSI Hood Velocity Controller Model 1615D", 2 pages.
Brochure: Dynamics Corp. of America, Anemostat Products Div., "The Anemostat Total System", undated, 2 pages.

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