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Sensor Block for Reducing Temperature Fluctuations

IP.com Disclosure Number: IPCOM000042542D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Deitz, JH: AUTHOR [+2]

Abstract

A conically shaped sensor block is provided for minimizing temperature fluctuations in a temperature controller. A temperature sensing device, such as a thermocouple, is placed at the narrow end of the conically shaped sensor block. The velocity of air exiting the narrow end of the conically shaped sensor block is increased by an order of magnitude over the velocity of air entering the wide end of the block. By increasing the velocity of the air flow past the thermocouple, fluctuations in sensed temperature due to changes in air velocity are minimized. As shown in the figure, temperature control unit 7 has an air- moving device 1 which creates a flow of air, as shown generally by the arrows 2. This air flow impinges on damper 3 from where it is directed toward conically shaped sensor block 5.

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Sensor Block for Reducing Temperature Fluctuations

A conically shaped sensor block is provided for minimizing temperature fluctuations in a temperature controller. A temperature sensing device, such as a thermocouple, is placed at the narrow end of the conically shaped sensor block. The velocity of air exiting the narrow end of the conically shaped sensor block is increased by an order of magnitude over the velocity of air entering the wide end of the block. By increasing the velocity of the air flow past the thermocouple, fluctuations in sensed temperature due to changes in air velocity are minimized. As shown in the figure, temperature control unit 7 has an air- moving device 1 which creates a flow of air, as shown generally by the arrows 2. This air flow impinges on damper 3 from where it is directed toward conically shaped sensor block 5. The shape of sensor block 5 is such that the velocity of the air flow exiting sensor block 5 is on the order of 10 times greater than the velocity of the air flow entering sensor block 5. As a result, the velocity of the air flowing past temperature sensing device 4 is 10 times greater than it would be without the use of sensor block 5. As the result of this increased air flow, the temperature fluctuation in the air sensed at temperature sensing device 4, due to changes in air velocity, is greatly reduced. The use of sensor block 5 substantially eliminates the need to change the position of temperature sensing device 4 every...