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Exhaust Alarm

IP.com Disclosure Number: IPCOM000050486D
Original Publication Date: 1982-Nov-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Rude, D: AUTHOR

Abstract

This alarm senses the difference in the static pressure in an exhaust duct 8 and the ambient (i.e., room) static pressure and gives an audible alarm when the difference is below an adjustable set point. The main advantage is the low cost and ease of installation.

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Exhaust Alarm

This alarm senses the difference in the static pressure in an exhaust duct 8 and the ambient (i.e., room) static pressure and gives an audible alarm when the difference is below an adjustable set point. The main advantage is the low cost and ease of installation.

The figure shows the overall circuit and its connection to the existing pneumatic gauge line. Pneumatic hookup is made by installing a tee 110 in the existing static pressure line 12 and connecting it via 14 to a pressure switch 16. If an existing static line is not available to tap, then a new Pitot tube may be installed in the duct.

A test switch 18 is provided to test the operation of a buzzer 20. A light 22 is provided to indicate when the electric power is on.

An adjustment screw 24 is provided on switch 16. Turning the screw will raise the alarm set point. A standard alarm has an adjustment range of .15 to .5 inch of water. Other ranges are available.

This device provides an audible signal from buzzer 20 when duct static pressure rises above the set-point value. This provides an alarm upon any condition that results in loss of air flow in the exhaust duct 8.

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