From: BobEngelhardt@comcast.net   
      
   On 12/18/2017 10:53 PM, Jasen Betts wrote:   
   > On 2017-12-18, Bob Engelhardt  wrote:   
   >> On 12/18/2017 12:42 PM, Bob Engelhardt wrote:   
   >>> An eBay listing for a electronic tachometer specifies that it's input   
   >>> can be a "wet contactor".  Is there a standard meaning for "wet contactor"?   
   >>>   
   >>> Thanks,   
   >>> Bob   
   >>   
   >> Once again I have not told the whole story :-(   
   >>   
   >> I was going to use this tach on my milling machine spindle, not my car.   
   >>    I think it works by pulsing a circuit between 2 of its connector pins.   
   >>    It also can be pulsed by " ... PNP or NPN proximity switch, HALL   
   >> sensor".  Does that help determine what the mean by "wet contactor"?   
   >>   
   >> Bob   
   >   
   > it seems that they bsically mean anything that generates a pulse every   
   > time the shaft rotates, what sort of sensor do you want to use?   
   >   
      
   I'd like to use a magnet on the spindle and a reed switch.  It's about   
   the most contamination proof.  If the reed switch is "wet".   
      
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