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Air Flow and Temperature Sensor

IP.com Disclosure Number: IPCOM000074387D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Ghose, S: AUTHOR

Abstract

This combination air flow and temperature sensor consists of two independent systems, one for monitoring temperature and the other for monitoring air flow. The air flow sensor portion consists of a light nickel plated plastic ball 1 and two contacts 3 and 4 mounted on a conical portion of the body 2. The temperature portion of the sensor is a bimetallic strip 5 mounted to the bottom of the body 2 by a screw 6. The bimetallic strip 5 is slotted and is adjustable so as to have more or less protrusion into the orifice area within body 2.

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Air Flow and Temperature Sensor

This combination air flow and temperature sensor consists of two independent systems, one for monitoring temperature and the other for monitoring air flow. The air flow sensor portion consists of a light nickel plated plastic ball 1 and two contacts 3 and 4 mounted on a conical portion of the body
2. The temperature portion of the sensor is a bimetallic strip 5 mounted to the bottom of the body 2 by a screw 6. The bimetallic strip 5 is slotted and is adjustable so as to have more or less protrusion into the orifice area within body
2.

In operation, when the sensor is mounted in an airstream, the air entering the orifice lifts ball 1 off the seat and opens contacts 3 and 4. Bimetallic strip 5 is adjusted so that over the allowable operating temperature range, it does not obstruct the air flow passage sufficiently to choke off the air to ball 1. An alarm is generated whenever ball 1 is in contact with contacts 3 and 4. This situation can occur whenever the rate of air flow falls below the value necessary for maintaining ball 1 out of contact with contacts 3 and 4 or when the temperature of the device is such that bimetallic strip 5 chokes off the flow of air to the ball causing the tall to make contact with contacts 3 and 4.

Variations of this basic concept are possible. For instance, the contacts could be etched onto the body. The contacts could be made adjustable allowing the capability to adjust the air flow set point of the senso...