Detecting Water Flow Through Pipe

  • Thread starter ssmith579
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  • #1
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I'm looking for a way to detect water flow through a pipe. For example, I want to detect when a toilet flushes or leaks. I'm looking for a way to detect this that doesn't require anything submerged in the tank or inserted into the water line. I really just want to know that water is flowing I don't care about flow rate. Any suggestions would be appreciated.

Steve
 

Answers and Replies

  • #2
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The most reliable way would be to drill a tiny hole in the piping (PVC?) on the up side (away from the direction of gravity) and somehow tape a bag over top of the hole. The bag should inflate when there's flow. You could also just put a tire pressure gauge into the hole. Change in pressure would indicate flow. Just make sure both are secured so you don't cause a leak.

If the flow is constant you could check the pipe temperature. It should be a bit cooler than room temperature if it's house water. You could also check for any vibrations in the piping.
 
  • #3
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Not sure of your budget and other requirements, but you can use a "non-intrusive" flow switch based on the Doppler or Ultrasonic principle. Do an internet search for non intrusive flow switch and you will find many producs.
 
  • #4
dlgoff
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The most reliable way would be to drill a tiny hole in the piping (PVC?) on the up side (away from the direction of gravity)

Wouldn't this cause it to flow all the time? :bugeye:
 

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