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Furnace fan shaft rotation detection

Furnace fan shaft rotation detection

Furnace fan shaft rotation detection

(OP)
  Hello All;
          Would anyone know the best way to verify shaft
   rotation when this furnace is in operation?  If the
   belts brake on the 1 15/16 dia fan shaft the load is
   scrap.  I need some kind of warning system for the
   operator.  I was considering a two piece shaft collar
   around the shaft with a 1/2 inch dowel pin sticking out
   about 2 inches and a prox switch but rotation is 1200
   RPM and it might be too fast.  Any better ideas??

           Thanks in Advance!
                             oldpilot

RE: Furnace fan shaft rotation detection

How about a tachometer with a low speed alarm?  You could use your dowel pin/prox switch as the input to the tach. Actually, more than 1 pulse/revolution would be desirable for the tach.  A gear with a prox. switch is often used.  Almost anything that generates a pulse can be used with a tachometer.

RE: Furnace fan shaft rotation detection

Q. Does the operator have a backup plan if, when the drive belts break? How is the batch to be saved in the event of a failure even with a warning in place?

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