View Poll Results: Do you use a micron guage when pulling a vacuum?

Voters
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  • Yes

    116 90.63%
  • Nope, we don't own one.

    12 9.38%
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Results 79 to 91 of 224
  1. #79
    Join Date
    Jan 2004
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    Lancaster PA
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    Quote Originally Posted by fitterchick View Post
    How can you say 30"hg is a perfect vacumm???

    30"hg your actual micron level can be 5,000+

    No it can't.

    When I intall equip the mfg requires your vacuum to reach 250 to 500 microns and hold for a set amout of hours (depending on the mfg.)

    Wow.

    Are you just making fun of me, or are you really clueless?

    Only make fun of people when ther are wrong
    Go read.
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  2. #80
    Join Date
    Jul 2001
    Location
    VA
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    2,801
    lol......... I live for these little moments.
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  3. #81
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
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    Quote Originally Posted by iraqveteran View Post
    30" hg is a perfect vacuum and is not possible. I believe the most that can be pulled with a vacuum pump is around 28"hg.
    Nope.

    A two stage rotary pump will do better than 28" hg.

    Back in the day when guys were using pumps made fro old recip refrig comps
    it was common knowledge that because of the clearance pocket for the piston there was always a little bit of air left over. This plus the limiting design of the piston made 30"hg impossible.

    Some guys would get an old rotary refrig comp but because the oil was never changed in the comp 30' hg was not possible in this instance either.

  4. #82
    Join Date
    Feb 2008
    Location
    Western NC
    Posts
    2,504
    ok so whats the best pump will pull. I was taught 28.something was lowest a vacuum pump can do. Of course that was several years ago and it was an Army base......

    anyhow, what the lowest the pump can pull?
    I fully support the military and the War on Terrorism.


    If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.

    If you do know, then do. But do it right. Otherwise, you may not be doing it long.

  5. #83
    Join Date
    Jul 2001
    Location
    VA
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    My pump will do about 35".....

    it loses it If I shake the gauge though. Then only does 29.
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  6. #84
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
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    6,058
    Quote Originally Posted by DPSwitch View Post
    My pump will do about 35".....

    it loses it If I shake the gauge though. Then only does 29.
    You must have one of those new Heim Effect pumps, eh, Dip?

  7. #85
    Join Date
    Jul 2001
    Location
    VA
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    2,801
    Yeah......it's a freaky little pump.... but a few minutes at 35" is all I need!
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  8. #86
    Join Date
    Jun 2006
    Posts
    491
    Quote Originally Posted by Mr Bill View Post
    And that ok Buddy we all started somewhere unlike some here that will make you feel so bad and belittle folks because they were born with a micron gauge in there butt and a NATE certificate in there hand and a Sling Psychrometer in there teeth. Rather than putting folks down here that haven't used these few tools of the trade we "Pro's" should be encouraging old and new Pro's that haven't been using these tools how these tools can be beneficial to them in servicing a/c equipment. I guess instead of the sarcasm and put downs use our knowledge and experience and treat these folks as students and teach them as any good teacher should, remember none here knows it all anyway, but if we all work "together" we can all gain knowledge from one another, "maybe" even something we did not know, just my two cents.

    'two cents' like that spends like a dollar with me. very nice.

  9. #87
    why do you think microns are not a lower measurement then the hg you read on your gauges?

  10. #88
    Join Date
    Feb 2008
    Location
    Western NC
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    2,504
    Quote Originally Posted by fitterchick View Post
    why do you think microns are not a lower measurement then the hg you read on your gauges?
    microns are a more accuate reading.....

    I believe thats where DPSwitch was going with it.

    just like digital guages are more accurate than analog......
    I fully support the military and the War on Terrorism.


    If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.

    If you do know, then do. But do it right. Otherwise, you may not be doing it long.

  11. #89
    Join Date
    Jul 2001
    Location
    VA
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    2,801
    Quote Originally Posted by fitterchick View Post
    why do you think microns are not a lower measurement then the hg you read on your gauges?
    Because they arent.
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  12. #90
    Join Date
    Jul 2001
    Location
    VA
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    The last inch on your compound gauge is equal to 25,400 microns.....
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  13. #91
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    Quote Originally Posted by fitterchick View Post
    why do you think microns are not a lower measurement then the hg you read on your gauges?
    No one is saying that reading in microns isn't easier then trying to read in hundredths of an inch in mercury.

    But you apparently, don't know the correlation between them.

    So before telling somebody that 30"hg isn't a perfect vacuum, check it out.

    We all agree that the 30" your gauge may show is meaningless.
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