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  1. #1
    Join Date
    May 2005
    Location
    South
    Posts
    580

    Fieldpiece SVG2 Vacuum Gauge not right, video

    I've used one of these a few years ago, it was a company tool. It worked well, connect it up, evacuate, and in an hour or so it would be down to 500 +/-.
    I've been using a Supco for the past year, company tool. I liked the fieldpiece better so I bought one.
    This new one just doesn't seem right.
    It will pull down fairly quick to 700 or so then rise up around 1100 and stay there forever. What I really don't understand is why the vacuum lowers when I add gas, as shown in the video.

    I install the gauge inline with the suction hose. This manifold set is fairly new, no low loss hoses or anything.

    I also have a picture of it reading stable at 950 with nothing connected to it.

    Seems like a defective gauge or an I missing something?

    http://youtu.be/xwWVCffXh14
    Attached Images Attached Images  

  2. #2
    Join Date
    Nov 2011
    Location
    Charleston, Wv.
    Posts
    1,436
    if they are a thermal gauge, you could have refrigerant still in the sensor area.....

  3. #3
    Join Date
    May 2005
    Location
    South
    Posts
    580
    Any idea why vacuum drops when r22 in gas form is added? And when the gauge is disconnected it takes 10-15 minutes for it to read OL...

  4. #4
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,050
    That is normal. The gauge is only accurate with air or nitrogen, it will not sense refrigerant gas pressure accurately.

  5. #5
    Join Date
    May 2005
    Location
    South
    Posts
    580
    I don't think it should drop when pressure is added.
    No matter what is adding pressure, it should not read a lower number.

  6. #6
    Join Date
    Feb 2011
    Location
    Peoria, IL
    Posts
    2,149
    Pull the tee, and clean sensor with rubbing alcohol. Then try it again.

  7. #7
    Join Date
    Apr 2013
    Location
    New York City
    Posts
    21
    Quote Originally Posted by garychance View Post
    Pull the tee, and clean sensor with rubbing alcohol. Then try it again.
    Exactly what I was going to advice. Buildup on the sensor could cause slower vacuum.

  8. #8
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,050
    Quote Originally Posted by truck12 View Post
    I don't think it should drop when pressure is added.
    No matter what is adding pressure, it should not read a lower number.
    Actually it will, I've seen it many times. Blow it put with nitrogen and it will go up instantly.

  9. #9
    Join Date
    May 2005
    Location
    South
    Posts
    580
    already cleaned the sensor.

    This SVG2 acts 100% different than the last SVG2 I had. Thats more a question that anything.
    I used the same identical tool before, it worked as expected, I'm using the two exactly the same, only this one makes no sense.

  10. #10
    Join Date
    May 2005
    Location
    South
    Posts
    580
    Quote Originally Posted by Chuck View Post
    Blow it put with nitrogen and it will go up instantly.
    no, it won't, tried that too.

    It doesn't matter, I exchanged it for a new one and the new one works normally, been using it for two weeks and it works like it's supposed to. This one I started the thread about didn't work right from day one.

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