I have a need to monitor human activity in a building and plan to install
something in a pipe to detect water flow to do it. Don't want to reinvent
such a thing if it already exists though. Anything out there already that I
can use for this?
You are right that there is such as sprinkling lines but I would put such a
device in the "human" use only line.
Thinking about a captive magnet in a PVC device in the line. I would detect
movement with a wire loop and process it from there. Would want to detect
any faucet or toilet turn-on however brief. Do you know of a flow meter
that could be used or modified in this way?
Wouldn't a normal flow switch be much simpler? I do not know if they just
strap on over a hole in the pipe or mount on a tee. But they have a thin
blade of metal that flexes out of the way and trips the switch when there
McDonnell Miller makes some sensitive flow switches, as does Johnson
controls. I Don't remember the model #s off hand.
You could also use an alarm system with motion detectors. You could
use a silent alarm or have it call your computer and report which zone
It all depends on what you want to do with it.
What size is the building and what kind of activity do you want to
Thanks all for the suggestions.
I took a look at the firms mentioned for liquid flow detectors (the only
way I want to go) and they are not as sensitive as I need (much less than 1
Searching the web didn't help me either though I'm sure something is out
there available. I've decided to hoke one up myself with a captured
magnetic in a PVC pipe with an external wire movement detector and a micro
circuit to do what I need. Thanks for your suggestions.
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