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  1. whistlemeup

    Solid State Relays vs Electromechanical Relays

    I am not a controls engineer, but have been around electronics for several decades. The cost of Solid State Relays is three times that of Electromechanical Relays which have been around for ever. For this application, both must be Class I Div. II capable. My question is, why should I select...
  2. whistlemeup

    Dynamically monitoring a reciprocating poppet valve?

    I need to instrument and dynamic monitor reciprocating compressor poppet valve motion. The poppet is mushroom shaped, made of peak material (plastic), operates in an atomosphere => 250 F, and is located internal to a gas compressor operating at 1200 rpm. Compressor valves consists of multiple...
  3. whistlemeup

    360 degree non-contact rotational indicator

    While there are many rotational function generators that give 360 ppr, they rely on direct coupling to a rotating shaft. What I am looking for is a way to place 360 marks, painted bars, reflective strips, etc. on one section of a flat 12 inch diameter coupling, and using something like a bar...

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