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  1. #1
    Join Date
    Aug 2007
    Posts
    339

    Confused Wet bulb reading with a amprobe THWD-2 Psychrometer?

    I have a question!

    I made a vow with myself that I would be a better tech by checking wet bulb on all of my new and existing install this year. I know what you guys are thinking! "You should have being doing that all the time!" Well anyway I got this Amprobe THWD-2 and I need to know the proper way of measuring for wet bulb in a home. In school many years ago we use a sling psychrometer that we had to wet a little sock and sling the thing around to get a wet bulb reading.

    And I've been reading some post and they where talking about taking it in the retrun. Please help I'm getting confused!

    I hope I did not waste my money on this tool.

    Thanks!!

  2. #2
    Join Date
    Dec 2003
    Location
    Citrus County, Florida
    Posts
    1,399
    I have one and you press the second button from the left bottom row until it says WT. Take the reading near the return. Watch it as it will update every few seconds.
    Doug

  3. #3
    Join Date
    Jan 2008
    Posts
    63
    relax brother, u did good the thwd-2 is a decent tool not everbody has the jack for testo stuff. for w\b to get sh you could drill ahole in the return drop or check at a return grille near t-stat.

  4. #4
    Join Date
    Aug 2007
    Posts
    339
    Thank's I feel much better now!!

  5. #5
    Join Date
    May 2009
    Location
    Jonesboro, AR
    Posts
    111
    Quote Originally Posted by cook42 View Post
    And I've been reading some post and they where talking about taking it in the retrun. Please help I'm getting confused!
    Technically speaking, WB should be taken directly at the evaporator air inlet, but in practice, that's normally impossible or impractical, so the return grille is fine. I used some wire to make a hook for mine, so I can hang it on the grille while I take other measurements.

    Jeremy

  6. #6
    Join Date
    Mar 2008
    Location
    Fuquay Varina, N.C.
    Posts
    417
    That is the only problem I have with mine, I am thinking of glueing on a strip of magnet to the back of mine to hold it on the grill while I am taking measurements.
    RSES Member.
    Mainstream Engineering Certified.
    HVAC/R PM Technician.
    410A, & GREEN HVAC/R Technician.
    NATE Core.
    Working not as to please men but to the Glory of Christ my KING.

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