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    bnvntv's Avatar
    bnvntv Posts: 1, Reputation: 1
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    #1

    Oct 31, 2011, 05:16 PM
    What is this spark-plug like device called?
    I'm trying to build a very simple, inexpensive way to sense airflow in a duct. I saw a device that was about the size and physical appearance of a spark plug, the lower portion of which protruded into a duct and appeared to function by being contacted by a swinging metal gate which was moved by the air flowing by the device when a fan was running. The portion of the device outside the duct had a single cable attached, much like a spark plug wire The purpose of the device was to insure that the fan was running. Any idea what such a device might be called?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Nov 1, 2011, 05:16 AM
    Sounds like some sort of sail switch. Do a web search for sail switch images, see if you can find a device that looks like what you have.
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