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Thread: Helium Gas leak detector

  1. #1
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    Helium Gas leak detector

    Anyone had any luck with any brand of leak detector compared to using a Helium Mass Spectrometer?

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    The 2nd most important amendment is to protect the 1st....

    Free Air Conditioner Sizing Chart

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    yes, we have

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    Quote Originally Posted by R123 View Post
    Hahaha!

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    The H-10 set the standard for the industry. So it has been my go to model for the past few decades. They came out with a battery model, and discontinued the corded only model, and I've heard some complaints about it. But don't know from personal experience.

    My H-10 Universal is getting long in the tooth, don't know how much longer it will last, but when it dies, I'll be getting the H-10 Pro.
    I do a triple evac with nitro to remove non condensables.

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    Quote Originally Posted by BBeerme View Post
    The H-10 set the standard for the industry. So it has been my go to model for the past few decades. They came out with a battery model, and discontinued the corded only model, and I've heard some complaints about it. But don't know from personal experience.

    My H-10 Universal is getting long in the tooth, don't know how much longer it will last, but when it dies, I'll be getting the H-10 Pro.
    H10 pro will not pick up Helium gas.

  7. #7
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    Oh, I thought you were using it for refrigeration work.

    In that case, the only ones I've seen were made by Varian. Pretty trippy. It was for finding leaks on deep vacuum equipment. They'd inject just a bit of helium, then even though the equipment was under a vacuum, the helium would leak out. Worked like a champ. Think they used to let it warm up for something like a half hour.


    Quote Originally Posted by jimp View Post
    H10 pro will not pick up Helium gas.
    I do a triple evac with nitro to remove non condensables.

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    Quote Originally Posted by BBeerme View Post
    Oh, I thought you were using it for refrigeration work.

    In that case, the only ones I've seen were made by Varian. Pretty trippy. It was for finding leaks on deep vacuum equipment. They'd inject just a bit of helium, then even though the equipment was under a vacuum, the helium would leak out. Worked like a champ. Think they used to let it warm up for something like a half hour.
    I was on a MR site yesterday, and they have been looking for a coldhead compressor helium gas leak for 30 days with soap bubbles. Pulled out the H10 Pro and cracked a helium gas tank, the H10 never picked it up.

    I failed as the hero.

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    That's because the H-10 breaks the refrigerant molecule up and is looking for chlorine and/or fluorine.


    Quote Originally Posted by jimp View Post
    I was on a MR site yesterday, and they have been looking for a coldhead compressor helium gas leak for 30 days with soap bubbles. Pulled out the H10 Pro and cracked a helium gas tank, the H10 never picked it up.

    I failed as the hero.
    I do a triple evac with nitro to remove non condensables.

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    Quote Originally Posted by jimp View Post
    I was on a MR site yesterday, and they have been looking for a coldhead compressor helium gas leak for 30 days with soap bubbles. Pulled out the H10 Pro and cracked a helium gas tank, the H10 never picked it up.

    I failed as the hero.
    Yeah, thats not gonna work


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    So I asked the FSE how he was going to find the leak. He said " keep changing parts " WTF. They had gone thru two large tanks of 99.99% medical grade already, working on the third.

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    Only time I ever did anything with helium was using it as a leak test gas on an item we constructed out of SS tubing...leak test was water dunk test....I am going to guess a dunk test is out of the question here. Lol

    Sent from my SM-G965W using Tapatalk

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    I recommended adding some 407 to it for the leak test, that freaked the guy out. He was worried about having residual 407 left in the system, I said we could triple evac and use the helium to purge every time.

    It was a no go.

    So I guess he will keep changing parts and using soap bubbles.

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    You need to get into a positive pressure. At 1* kelvin (-457*F), youre only at 0.002 psi.

    At 3* kelvin, youre roughly 4psi. Im not sure what the relief valves is set for. High pressure relief of helium is EXTREMELY EXPENSIVE!!

    If you could get to around 1-3 psi, it would be easier to locate the leak. What is the operating temp. Of the primary? Its been awhile since I played with MRI coolers.....

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    With all due respect, you didn't know how to sell that. But let's talk about this unit . . .


    Quote Originally Posted by jimp View Post
    I recommended adding some 407 to it for the leak test, that freaked the guy out. He was worried about having residual 407 left in the system, I said we could triple evac and use the helium to purge every time.

    It was a no go.

    So I guess he will keep changing parts and using soap bubbles.
    I do a triple evac with nitro to remove non condensables.

  16. #16
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    Yeah, not really sure what the big deal is, a quality helium leak detector with rebuilt parts is only $8k+.

    Jeez, why would you keep throwing parts at it . . . ?

    https://www.provac.com/products/vari...leak-detectors


    Quote Originally Posted by jimp View Post
    So I asked the FSE how he was going to find the leak. He said " keep changing parts " WTF. They had gone thru two large tanks of 99.99% medical grade already, working on the third.
    I do a triple evac with nitro to remove non condensables.

  17. #17
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    Ah, just saw Chops comment above. Yes this is key. Is the low side of the system under a vacuum when running? Because, as I mentioned prior, helium will still leak out under a vacuum, so you can leak check while the system is running.

    Regarding my comment about not being able to sell the freezey juice leak check [depending on a bunch of things like rated system stuff], all you need to do is get the blessing from the refrigerant manufacturer. At worst, you'd need to change the oil a couple of times. Cheap in the whole scheme of things.

    How much down time is available?
    I do a triple evac with nitro to remove non condensables.

  18. #18
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    The other question is why are we even having this discussion......

    99% of MRI machines are under contract with the manufacturer. The factory technicians are very specialized in what they do....and are NOT parts changers.....

    Where is this unit located?

  19. #19
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    Quote Originally Posted by 71CHOPS View Post
    You need to get into a positive pressure. At 1* kelvin (-457*F), you’re only at 0.002 psi.

    At 3* kelvin, you’re roughly 4psi. I’m not sure what the relief valves is set for. High pressure relief of helium is EXTREMELY EXPENSIVE!!

    If you could get to around 1-3 psi, it would be easier to locate the leak. What is the operating temp. Of the primary? It’s been awhile since I played with MRI coolers.....

    The leak is in the primary cooling side that has the cryo compressor, high side pressure runs about 320 PSI. It has a static charge of 260PSI.

    The secondary liquid helium side starts venting at 6PSI, it was up to 5.27 yesterday, not my problem.

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    Quote Originally Posted by 71CHOPS View Post
    The other question is why are we even having this discussion......

    99% of MRI machines are under contract with the manufacturer. The factory technicians are very specialized in what they do....and are NOT parts changers.....

    Where is this unit located?
    I am not going talk about location. And I will disagree with the FSE's being very specialized. Now they do have specialist, which are spread very thin, which help the FSE's out.

    One job I had recently the chiller was reported out, no problem with the chiller. It was the control valve in the gradient coil heat exchanger was bad, so they changed out the heat exchanger. Next morning I received another call the chiller was out, so I went back to the site. Guess what, the smart guys didn't put any water in the secondary side.

    Then you have the Third party companies which are growing very fast, less than half price. I would say they service about 40% of the machines here.

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