Which One Is Right?

Forums PCP Airguns Which One Is Right?

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    FukoChan
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    Hey so i just got an fx impact, and a 75CUFt air venturi tank. Everything is good so far besides the pellet probe being loose and strange accuracy until i super cleaned the barrel. Still learning the gun and love it but ofc, like any 2000$ gun in this market, there is a problem. The pressure gauge is acting funny. The FX one says 240ish bar while my tank says there is 190ish bar. So which one is right? I have a feeling the answer to this question is: The tank’s pressure gauge is more accurate and the correct pressure reading. The FX Impact’s gauge is defective and must be replaced. And…it is probably okay to just go off of the tank’s pressure or add 50Bar to the shown pressure. Is it okay? Should i just leave it like that. Is it an easy fix?

    Suggestions?

    Update: Lots of other issues came up so Im sending it to AOA. I hope i can either get a replacment or refund as it was not very shiny when it came to me. Kinda felt battle hardened.

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    oldspook
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    You are playing with a bomb there so it would be good to be very conservative with the choices you make.  Take the bottle to a dive shop and have it charged to a KNOWN pressure level and check your bottle’s gauge against that.  Once you know if the bottle gauge is telling you the truth it will be safe to make assumptions about the gun’s gauge.  The SAFE assumption here is that the gauge that is reading the highest is the one that is correct.  With a 60 bar difference (725 PSI) you are in danger territory if you get it wrong.

    So take the bottle to someone who can put a known pressure in it and then check your bottle gauge.  … Then you will know if the gun is telling the truth or the bottle gauge is telling the truth.

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    Dirte
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    What oldspook said. That is why it is nice to have two gauges on your bottle. Also don’t rely on any tiny gauges on the FX. It is almost an embarrassment how far they are off. Mine is off 40 bar. This is why a lot of guys replace them.

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    FukoChan
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    Thanks. I guess it will be a pain to replace. Is it just unscrew and screw a new pressure gauge in? Thank you for the advice. I’ll get the gauges tested for accuracy.

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    Mohannad
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    I have the same problem with impact and best fitting on scpa tank. The difference is only 30 bar
    i always trust my gun’s  gauge.

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    Alan
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    If you took the time to take apart one of the small gauges, it wouldn’t take you long to realize why they’re so inaccurate. Fact is, it is a wonder they work at all. 

    If you want to be absolutely sure, you can buy a calibrated Wika gauge from from Davis et. al. They hover around $500 for a 5,000 psi gauge, and offer ±.75% of full scale. I can’t say all, but the one close-by dive shop I know about uses one. Smart business I would say.

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    Hynzie
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    I hope u resolve ur problem… When u had ur new tank filled did they tell u the pressue at dive shop.. did you notice anything off then .. theese guys above know there stuff .. so i would follow there instructions to a t ..congrats on the impact.did you return or sell the wildcat..earlier thread i was pushing u to get the impact from utah airguns . there fantastic..how did u get a impact so quickly..good luck with everything. ….pat

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    blackdiesel
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    In my case (my gauges) I tend to go with my tank gauge because I can see the pressure on my tank gauge match the gauge on my compressor when I fill tanks.  I only have one gun that’s really off.  The gauge on my RAW is about 40 bar lower than my tank gauges.  

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    NMshooter
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    OldSpook is giving you good advise. Make sure your tank gauge is correct or at least know how far off it is. I never rely on ANY gauge on my rifles. I use my compressor gauge. My tank actually measures 500 psi low. Because it is an easy number to read I just fill 500 psi over. So instead of filling to 3,000 psi, I fill to 3,500 psi. You may not have to change the gauge if you know how far it is off and adjust accordingly. It is easiy enough to change the gauge, just has not been a priority for me. 

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    Sprocket
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    Now do a google search for:  “how are air pressure guages calibrated”.   Even a calibrated gauge can be inaccurate.    I worked in industrial plant maintenance for 20 years.  Never saw a pressure gauge that I would trust to be 100% accurate at any time.  Basically all you can do is read a gauge and hope it is close.

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    Draco1
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    Hello,
    I am a newb to pcp, and I am trying to learn as much as possible. However I have worked in R&D for 30 some odd years, and agree never trust an unknown guage? thier is a way to test for an issue and know where the guage is its a deadweight tester, here is a link this may a bit out of the way for everyone, but works, as does matching the tank to compressor, I like that idea as well,
    http://www.instrumentationtoolbox.com/2013/08/how-to-calibrate-pressure-gauge-with.html#axzz4lmMn52Q7
     

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