jamieoldham2004 jamieoldham2004

10-02-2021
Engineering

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What device may be used to ensure that air is flowing through a duct before an electric strip is energized

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Perplexed20 Perplexed20

01-03-2021

Answer:

Most commonly used air flow proving interlocks are:

differential pressure air flow switch. Contact changes state based on duct static vs. atmosphere outside the duct or dp across a fan inlet to outlet
CT relay. Current transformer relay that changes state from 0 to 1 open/closed when amp draw on a blower motor exceeds the trip setpoint.

Explanation:

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