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Thread: Pressure Gauge gone crazy?

  1. #1
    Registered Member steve b's Avatar
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    Default Pressure Gauge gone crazy?

    Hi, anyone had this problem? Got my waters right and started to run 200l of DI when I noticed the gauge going mad. Is this a faulty gauge (old) or pump (pump brand new)? Any ideas. Going from 5-9 Bar.IMG_0059.jpg

  2. #2
    Homesteader jwcarlson's Avatar
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    Default Re: Pressure Gauge gone crazy?

    What kind of pump is it? It's possible it's just reacting to the pump discharge pressure fluctuation.

    Edit to add: I see it says diaphragm pump. I'd guess that this is normal discharge pressure. They work by pushing a volume of water, refilling (pressure drops off) and then pushing out the volume again. In other words, the discharge pressure won't be particularly constant.

    See here:


    Who knows what the construction inside your pump is, but the principle is likely the same. If the gauge wasn't doing this before, but is now that might indicate something is wrong.
    Last edited by jwcarlson; 04-01-2024 at 08:29 AM.

  3. #3
    Registered Member steve b's Avatar
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    Default Re: Pressure Gauge gone crazy?

    Thanks, had an old one apart and it has 3 valves which intern pump the water so yes there is a fluctuation but it has been steady at about 6 Bar for a long time. This is something iv'e never seen before, maybe some thing has broke in the gauge?

  4. #4
    Homesteader jwcarlson's Avatar
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    Default Re: Pressure Gauge gone crazy?

    Could be something in the gauge or maybe one of the diaphragms (assuming there's two) in the pump is damaged and so it's only outputting one half of the cycle or something? If it was steady before then something clearly changed. Assuming that the gauge is a lot cheaper than the pump, you could try putting a new gauge on and seeing what a new one does.

  5. #5
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    Default Re: Pressure Gauge gone crazy?

    I've had issues with pressure gagues getting stuck. Sometimes tapping on them corrects the problem. I would normally guess gague first but if it's a new pump maybe it just operates a little different than your old one.

  6. #6
    Registered Member steve b's Avatar
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    Default Re: Pressure Gauge gone crazy?

    Replaced the old gauge and still have the same problem...

  7. #7
    Homesteader jwcarlson's Avatar
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    Default Re: Pressure Gauge gone crazy?

    Is your system making any less RO than it was?

  8. #8
    Registered Member steve b's Avatar
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    Default Re: Pressure Gauge gone crazy?

    Quote Originally Posted by jwcarlson View Post
    Is your system making any less RO than it was?
    No seems the same

  9. #9
    Registered Member coralbandit's Avatar
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    Default Re: Pressure Gauge gone crazy?

    I would be checking the supply line for an obstruction.
    Disconnect the supply side and see if it flows ' normal'.
    Make sure your shut off valve is on 100%. Move it around since that is where stuff tends to clog IME.
    http://www.youtube.com/watch?v=uhFp68wjRUU
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    Got rams ?

  10. #10
    Registered Member steve b's Avatar
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    Default Re: Pressure Gauge gone crazy?

    Quote Originally Posted by coralbandit View Post
    I would be checking the supply line for an obstruction.
    Disconnect the supply side and see if it flows ' normal'.
    Make sure your shut off valve is on 100%. Move it around since that is where stuff tends to clog IME.
    Can't imagine any crap in the line but will take it apart to just test.

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