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Rough environment rotation speed sensor

Former Member

Hello altogether,

 

I want to measure the rotation speed of a auxiliary fan which is enclosed in a duct pipe system.

There will be humidity and steam from boiling water (can compare to cooking on a gas hob in the kitchen)

 

The fan blades are made of plastic.

 

I was recommended to use an optical sensor, but I am worried that the steam will interfere.

 

Has anybody experience with something like this and can recommend a certain type of sensor or maybe even a special product?

 

Thanks guys!

Parents

  • If you do choose to go down the Magnetic route, you might want to look at Hall Effect magnetic sensors over reed switches. The solid state nature of a Hall effect device will typically outlive the mechanical operation of a reed switch, Especially with the number of operations you are expecting.

     

    A reed switch may have issues keeping up with the high speed switching if operating three times per revolution.

  • in reply to gadget.iom

    I was going to mention hall effect sensors. The reason I went with reed switches was because they operate over a wider temperature range, but I suppose for steam (~100 degrees C) hall effect will be fine.

     

    A previous project I was involved in needed to measure rotational speeds in environments of 300+ degrees C. We used multiple reed switches for redundancy/reliability.

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  • in reply to gadget.iom

    I was going to mention hall effect sensors. The reason I went with reed switches was because they operate over a wider temperature range, but I suppose for steam (~100 degrees C) hall effect will be fine.

     

    A previous project I was involved in needed to measure rotational speeds in environments of 300+ degrees C. We used multiple reed switches for redundancy/reliability.

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