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Old 03-28-2012, 11:42 AM   #15
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How about mount one of these guys high up in the grey tank, and wire it to a light or buzzer?
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Old 03-28-2012, 12:26 PM   #16
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Quote:
Originally Posted by Ramblin View Post
How about mount one of these guys high up in the grey tank, and wire it to a light or buzzer?
Ramblin,

So far your latest suggestion is the best that I have heard.
I have a concern with making a leak proof connection on the gray water tank with this
Tank Plastic Float Switch Liquid Water Level Sensor.


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Old 03-28-2012, 12:34 PM   #17
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QUOTE: Romeo;1127691 "One could build a simple alarm from a buzzer/chime and drill a couple of small holes downstream of the p-trap. Insert a couple of contacts (+/-)... maybe even just screws protruding into the drain pipe. When the water level reached the contacts it should complete the circuit and ring the alarm. The biggest problem would be to find 12vdc near the drain... or just use a battery powered alarm."

A bigger problem would be that the alarm would go off every time you took a shower or ran water DOWN the drain, unless the drain is big enough to locate the contacts in top of the pipe. The OP wanted a way to sense water coming back UP. Two contacts in the grey water tank mounted high in the tank would also be set off each time the water sloshed around while traveling. Those contacts could be disabled when traveling, but it's getting awfully complicated when the level monitor already tells you what's going on....if you check!
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Old 03-28-2012, 12:49 PM   #18
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Quote:
Originally Posted by Gaetan Lavoie View Post
Ramblin,
So far your latest suggestion is the best that I have heard.
I have a concern with making a leak proof connection on the gray water tank...
Should not be difficult to make a leak-proof connection. Use the supplied rubber grommets, and gob on a tube of clear silicone and you're probably good to go. I'd make sure the switch is up to the task though. Might not be suitable for the stuff it comes in contatct with in a typical grey tank (detergents, toothpaste, bleach, etc)
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Old 03-28-2012, 05:23 PM   #19
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Originally Posted by BFlinn181 View Post
QUOTE: Romeo;1127691 "One could build a simple alarm from a buzzer/chime and drill a couple of small holes downstream of the p-trap. Insert a couple of contacts (+/-)... maybe even just screws protruding into the drain pipe. When the water level reached the contacts it should complete the circuit and ring the alarm. The biggest problem would be to find 12vdc near the drain... or just use a battery powered alarm."

A bigger problem would be that the alarm would go off every time you took a shower or ran water DOWN the drain, unless the drain is big enough to locate the contacts in top of the pipe. The OP wanted a way to sense water coming back UP...
The installation of contacts in my suggestion would be made in a "vertical" section of drain piping or in the top of a horizontal section. I don't believe there is enough back pressure in an open drain line to fill the drain pipe enough to short the contacts; however, before I installed such a thing I would build a mock-up of the same size and run water through it to see if the concept worked only when a full tank backed up.

In my case, I wouldn't be able to get to my grey tank easily enough to install a level gauge.
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