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Checking the pressure in an air cylinder

Discussion in 'Anything Airgun Related' started by Dag, Sep 10, 2014.

  1. Dag

    Dag Pro Poster

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    i have a new toy, an S400 PCP and want to keep an eye on how many fills I get out of the cylinder which is a 4l Hydrotech @ 300bar. I feel pretty confident the cylinder gauge is accurate but the rifle gauge appears to be reading approx 20bar too low but that's another story and one that I understand others with Air Arms rifles do not feel too happy about.
    Anyway, my question is how to check the cylinder pressure and I'm thinking that a blanking plug fitted to where the quick release coupling supplied with the rifle might do. Alternatively I could remove the entire connector tube and fit a plug to the much larger female fitting at the valve.
    I just want to check that the filling tube is ok to take up to 300bar as it would normally be operating at approx 200bar. The safe option is of course to fit the larger plug straight into the valve but I'm not sure what thread that is, does anyone know?
    The idea is to blank off then open the valve fully and read off the cylinder pressure, then to close the valve and vent off before removing the plug and reconnecting the filling tube and fittings.
    I know I'm only repeating what many must do already but is there a simpler and safe,or safer, way?
    Dag
     
  2. stevemandm

    stevemandm Honorary Member

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    could buy a blanking plug from best fittings. alternatively, keep filling your s400 to the desired pressure (optimum fill should be to 160~170 bar, reading from fill bottles gauge). when you can no longer fill to this pressure, that's what's left in the bottle.
     
  3. Pidlar

    Pidlar Big Poster

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    Go with the blanking plug idea, it's simple. As Steve said best fittings do them.
    Regards Stu.
     
  4. ratman60

    ratman60 Pro Poster

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    hello, 190 is the max fill or you will blow seals and these guages can read a slight difference and you should get about 15 plus fills from a 4 ltr, a blank will give you bottle reading, like all pcp users a loss of air always accures on filling, i fill my s410 to 190 and drops back to 180 for 80ish shots
     
  5. tintin

    tintin Engaging Member

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    As already mentioned, a blanking plug is required.
    You've lost me regarding the ability of the air tube to take 300bar. What do you own which is capable of accepting a 300bar charge (with the exception of the actual bottle which is tested way past that0.
     
  6. Dag

    Dag Pro Poster

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    I couldn't have explained it clearly enough. I was thinking of a blanking plug at the end of the tube where the quick fill adaptor is normally connected., not allowing the pressure in the rifle to go to that!:eek: My concern was whether the tube is rated to take 300 bar if blanked off , not with it connected to the rifle.
    The alternative was a larger plug at the valve with the filling tube removed. If I can determine the size/thread of the larger plug that is obviously the best option.
    The method, which I understand some use, of filling until the cylinder can fill no longer is what I am trying to avoid.
    From suggestions to look at Best Fittings in other threads I had looked at their site but couldn't determine the correct fitting.....I'll keep looking
    Thanks for all your advice
    Dag
     
  7. themadspread

    themadspread Donator

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    as steve put it earlier take no notice of the aa gauge on the gun(miles out)fill your gun to 180 tops(160 is better start of sweet spot)when your bottle wont fill to 160 its time for a top up(it will only fill the gun to the pressure in the bottle )
     
  8. mattyts

    mattyts Donator

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    Your filling 'whip' should withstand 300 bar so you can fit the blanking plug onto the quick fit adaptor.

    You could,as you said unscrew the whole assembly and fit a bigger blanking plug but that to me seems a waste of effort as you'll have to get a correct spanner out and tighten/slacken everything off.
     
  9. Alex.B

    Alex.B Big Poster

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    If you have had it filled to 300 why worry , just fill your gun a few times and enjoy :D when it doesn't fill it to the optimum then get it filled again , simples .
     
  10. Dag

    Dag Pro Poster

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    As ever a lot of good advice. Thanks fellas!
    Dag :)
     
  11. Dag

    Dag Pro Poster

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    I'm hoping I get quite a few more fills than 15plus, the Chairgun ( there I go again!) calculator estimates 38 to 42 but I'll be happy with a few less than that.
    At the mo' I'm recording each fill and will take note of the shots per fill shortly ie when the rifle ( and me ) settle down.
    I don't think I'm getting anything like as much as 80 per fill and would be delighted if I did, I'll let you know as a pattern develops.
    Dag

    ps Just found this on the Hydrotech site:



    [TABLE]
    [TR]
    [TD]Size[/TD]
    [TD]4 Litre (1200 Litres @ 300Bar)[/TD]
    [/TR]
    [TR]
    [TD]Max Pressure[/TD]
    [TD]300 Bar[/TD]
    [/TR]
    [TR]
    [TD]Airgun Fills*[/TD]
    [TD]20[/TD]
    [/TR]
    [TR]
    [TD]Weight[/TD]
    [TD]9 Kg[/TD]
    [/TR]
    [TR]
    [TD]Height/Width[/TD]
    [TD]46/22 Cm[/TD]
    [/TR]
    [TR]
    [TD]Test Interval[/TD]
    [TD]5 Years[/TD]
    [/TR]
    [/TABLE]

    *Typical miniumum fills per cylinder for a gun operating down to 100 bar having internal 0.4Litre storage



    Now, I think my rifle cylinder is approx 155cc, info courtesy of Cloverleaf, and if that's correct then according to Hydrotech I should get something like 400/155 x 20 = 55 fills!!!:eek:
    But I don't see that happening somehow, but we'll see
    atb
    Dag






     
    Last edited: Sep 11, 2014
  12. jjones

    jjones Well-Known Member

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    Just got the best fittings quick change starter kit (have hw and bsa adapters and 1 cylinder) and this comes with a blanking plug for the quick release all for 20 quid and appears to be a quality kit.
     
  13. Kenbarcon

    Kenbarcon Donator

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    Using Airgun HQ calculator you will get between 25 and 31 fills.
     

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