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Need rec for level indicator freon receiver

Need rec for level indicator freon receiver

Need rec for level indicator freon receiver

(OP)
For an R22 Horizontal Receiver, about 22" diameter.  Need a recommendation for a continuous level indicator.  Primary concern is reliability, and leak free design.  Can be electronic or mechanical.  Any ideas.

RE: Need rec for level indicator freon receiver

I have seen bullet type sight glasses used on the side of tank.  The tank was for F-12, but that is how the liquid level was detected.  Liquid visible in the bottom glass, good, top above the top glass, bad.

rmw

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