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  1. #1
    Join Date
    Sep 2004
    Location
    SoCal
    Posts
    449

    Honeywell Temp/resistance chart

    Does anyone have a copy of the Honeywell form 63-7074 to share that specifies the resistance/temperature association for 20K sensors? I can't seem to find one anywhere on the net and I'd like to reuse some Honeywell T7770 sensors on a LON job.
    Thanks!
    lb
    A hundred million nodes - it's a LON story.

  2. #2
    Join Date
    Jun 2009
    Location
    StL, MO
    Posts
    583
    The TR21 series sensors replaced the T7770s. The TR21s are 20K (except the 21A) and there is a resistance chart in the installation instructions.
    UA LU 562

  3. #3
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,635
    www.customer.honeywell.com


    bottom right hand corner...............search
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  4. #4
    Join Date
    Sep 2004
    Location
    SoCal
    Posts
    449
    I have the hokey little Honeywell chart. What I need is a table that specifies specific resistance values over a range of temperatures.
    It seems that the table (form 63-7074) that is referred to in the product literature, has been removed from the planet. Maybe one of you 'old-timers' has a copy?
    Cheers,
    lb
    A hundred million nodes - it's a LON story.

  5. #5
    Join Date
    Apr 2007
    Location
    San Diego, CA
    Posts
    1,330

  6. #6
    Join Date
    Sep 2004
    Location
    SoCal
    Posts
    449
    THANKS DIGO!
    lb
    A hundred million nodes - it's a LON story.

  7. #7
    Join Date
    Apr 2007
    Location
    San Diego, CA
    Posts
    1,330
    You're welcome!
    LB, where in SoCal are you at? we're practically neighbors

  8. #8
    Join Date
    Sep 2004
    Location
    SoCal
    Posts
    449
    Hi Digo,
    We're based in Santa Clarita but service most of the LA area - south from Huntington Beach north up to Bakersfield, east to Pomona and west to Ventura. Most of the work lately is in the
    SFValley and Hollyweird.
    One of my old Elon compadres was also a Brasil-nut - Do you know Howard Herrera? I think he now works for Wattstopper.
    Let me know when you're up this way and I'll buy the cold ones!
    Cheers,
    lb
    A hundred million nodes - it's a LON story.

  9. #9
    Join Date
    Apr 2007
    Location
    San Diego, CA
    Posts
    1,330
    Nice. We do mostly SD county, from South Bay up to Temecula.
    We occasionally come up to LA - we have a few buildings we were asked to rescue, hopefully none of yours!
    PM me your #, and I'll call you next time I'm up that way.
    Don't know Herrera, it'd be nice to meet a fellow nut working in this nutty field.

  10. #10
    Join Date
    Jul 2002
    Posts
    889
    Just some formulas I kepp in my PDA spreadsheet:
    -----------------------------
    B2 is the temperature cell.



    C7041B,C,D,F,J,K mild temps
    =67993547.1109369*(B2^-1.8919965700969)

    C7170A, C7100A
    =4.8*B2+3114.4

    C7170B,C7100D,C7130B,C7031-PT1000
    =2.1*B2+887

    C7031G2006 w W927
    =-2.2*B2+1914

    C7031G2014 w W927
    =-2.1*B2+3645.7

    C7031D2003,J2009 w W927
    =2.1*B2+935.3
    Second place is the first loser.

  11. #11
    Join Date
    Jan 2002
    Location
    Fort Worth\Dallas, Texas
    Posts
    1,699
    If you have an Iphone or Itouch you can get the Temp Chart App and it will break it down in 1 deg incriments for you.
    Go Rangers!

  12. #12
    Join Date
    Sep 2009
    Location
    Midwest
    Posts
    34

  13. #13
    Join Date
    Sep 2010
    Location
    Denver, Colorado
    Posts
    1

    Honeywell 20k Resistance Chart

    This chart worked very well for the Honeywell Series 2000 C7041 20k ohm sensors. Thanks for the link.




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