Pressure gauge info?
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  1. #1
    1000+ Posts Fordman's Avatar
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    Default Pressure gauge info?

    Have installed this pressure gauge on my retic bore submersible pump. In the instructions it says for accuracy, after installation, to cut off the little rubber "tit" at top of gauge, presumably for some sort of pressure equalisation. They say the "tit" is sealed for transport which makes me a bit suspicious about leaking. As I have mounted it horizontally (and it would be hard to do otherwise), I dont want to cut it off if the internal liquid, which I think is glycerine for dampening purposes, is going to leak out. I did check when I bought it that it could be mounted horizontally, and the guy said I could mount it in any position, but the rubber bit wasn't mentioned, and after all, he is a reticulation guy, not a pressure gauge expert.

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    My question really is, does it make much difference, given it's location and purpose isn't exactly under laboratory conditions? I dont want to risk the fluid leaking out, but maybe it has a sort of internal diaphragm and won't leak anyway. And if it's likely to make less than 5% difference in the readings I would just as soon leave it intact.
    Anyone got anything to add?

    Hopefully you can see the "tit" at the "top" of the gauge in the photo. It is protruding from a grommet-like plug about 8mm dia. And BTW, the setup in the photo is only for testing, I have since replaced the outlet with 40mm pipe.
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  2. #2
    1000+ Posts bluey504's Avatar
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    The 'tit' is there for transport purposes only. The why is pretty evident when you have a package leaking GOKW (God Only Knows What) all about, chuck in the port of origin(ex Commie ) and the peeps involved start searching for their phones/laptops/meds.


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  3. #3
    Too many posts! JohnW's Avatar
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    Same on mine. I'm pretty sure it just gives slightly more accuracy with respect to air pressure changes so the guage Bourdon unit is not isolated. Given you are concerned about pressures in the tens to hundreds of kPa, I would leave it on and keep dirt out of the gauge. The accuracy shouldn't be affected significantly for your purposes I think.

    FWIW, I have a pressure relief valve set at 300 kPa on our reticulation so as to avoid excessive pressure in the HDPE rising main from the submersible pump to the surface. Hence our pressure gauge.

    Maybe see you at the Classic Car Day.
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  4. #4
    1000+ Posts jo proffi's Avatar
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    My 100psi bore pump gauge still has its tit uncut, although it is in the sun and cracked a bit so i dont know either way if it is sealed or not.

    Jo
    Last edited by jo proffi; 14th April 2013 at 11:16 AM.

  5. #5
    Too many posts! JohnW's Avatar
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    Quote Originally Posted by jo proffi View Post
    My 100psi bore pump gauge still has its tit uncut, although it is in the sun and cracked a bit so i dont know either way if it is sealed or not.

    Jo
    psi ???
    JohnW

    Renault 4CV 1950 (R1062)
    Renault R8 1965 (R1130)
    Renault Scenic Series II 2005 (wife's)
    Renault Scenic Series II 2006 (daughter's)
    Renault Scenic Series II 2007 (mine)

    CitroŽn CX Pallas 1980 (moved on to new custodian)

    National Co-ordinator, Renault 4CV Register of Australia

  6. #6
    1000+ Posts jo proffi's Avatar
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    Quote Originally Posted by JohnW View Post
    psi ???
    correct 100 psi/ 700Kpa.

    Maybe mine is bigger than yours.

    Jo

  7. #7
    Too many posts! JohnW's Avatar
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    Quote Originally Posted by jo proffi View Post
    correct 100 psi/ 700Kpa.

    Maybe mine is bigger than yours.

    Jo
    JohnW

    Renault 4CV 1950 (R1062)
    Renault R8 1965 (R1130)
    Renault Scenic Series II 2005 (wife's)
    Renault Scenic Series II 2006 (daughter's)
    Renault Scenic Series II 2007 (mine)

    CitroŽn CX Pallas 1980 (moved on to new custodian)

    National Co-ordinator, Renault 4CV Register of Australia

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