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Floor Temperature

Discussion in 'Electronic Design' started by [email protected], Jun 11, 2008.

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  1. Guest

    How would you measure the temperature of a concrete floor with a non
    contact method? The object is to turn on the floor heat a few degrees
    above freezing and relative to floor temperature. In other words a
    non contact thermostat set up to keep the floor from freezing. Non
    contact is desireable to prevent the sensor from being corroded by
    road salt and crap the cars haul in the winter. The present setup
    uses a conventional wall thermostat with a minimum temp setting of 50
    degrees. In the winter it turns on the heat unnecesarily any time the
    door is open for a short time. Drilling a hole in the floor for a
    sensor is risky since it is unknown where the floor heat tubing is
    located. Would like to do this for < $50. Any suggestions for
    sensors, etc appreciated.

    BobS
     
  2. A remote infrared thermometer will do that. Often sold as a "laser"
    thermometer as commercial hand-held units, but most likely available as a
    module, or could be hacked if not.

    Dave.
     
  3. Joerg

    Joerg Guest

    Would a contactless IR sensing thermometer work?
     
  4. Phil Allison

    Phil Allison Guest

    <
    ** There is only one non-contact method - a pyrometer.

    http://en.wikipedia.org/wiki/Pyrometer


    ** An IR thermometer is affected by the "emissivity" of the surface.

    http://en.wikipedia.org/wiki/Infrared_thermometer

    http://www.engineeringtoolbox.com/emissivity-coefficients-d_447.html

    So reliable readings are not likely off a concrete floor in a busy garage.


    ** Well, forget IR.

    And also forget coming here with crackpot ideas and specifying an absurd
    budget.



    ...... Phil
     
  5. Guest

    Ok, Phil,

    How would you do it budget or not? An IR sensor and PIC would fall
    the price range. Lets be constuctive here.

    BobS
     
  6. Joerg

    Joerg Guest

    By the time it freezes you'll probably have the first fender benders
    already.

    Bob: Why can't you embed a regular NTC somewhere off the usual vehicle
    paths? Must be in a place where there are no heater lines. Drill a hole
    into the concrete and pot it up really well. Chisel a trench from there
    to the wall.

    Best would be if this was a stainless encapsulated version or similar
    with the top exposed so it catches a freeze early enough. Then figure
    out via a test at which temperature you'd want the heaters to come on.

    You could also mount it really low on a wall but if this garage or
    whatever it is could be visited by the graffiti gang that might be
    vandalized.
     
  7. Phil Allison

    Phil Allison Guest

    <
    How would you do it budget or not?


    ** Bury a K-type thermocouple in the damn concrete.

    Connect it to a K-thermocouple amplifier and use the output voltage to do
    the job.

    Interfacing is your problem - pal.




    ....... Phil
     
  8. Phil Allison

    Phil Allison Guest

    "Phil Hobbs"


    ** I see no sign of that link you promised

    To a HP 400A true rms voltmeter ???




    .... Phil
     
  9. Phil Allison

    Phil Allison Guest

    "Paul Hovnanian P.E."

    ** Why not just some 5 minute epoxy ??



    ..... Phil
     
  10. ehsjr

    ehsjr Guest

    I just sent you an email that may be of interest,
    based on your location.

    Ed
     
  11. legg

    legg Guest

    Have you tried a builder's stud-locator to map conductor locations?

    These are often sensitive to live conductors, as well (apply power
    when searching).

    This could give you a safe sensor/wire routing option.

    I frankly don't see the point of heating a garage floor, when used
    only for vehicular storage. What is the aim here - to protect the
    heating system from damage?

    RL
     
  12. Phil Allison

    Phil Allison Guest

    "legg"

    ** More likely to prevent the staff and vehicles from damage - if ever the
    floor gets covered in ice.




    ...... Phil
     
  13. I'm with Phil here.. a hole drilled into the concrete to accomodate
    the sensor will yield solid readings. Other methods are unlikely to do
    so.
    Best regards,
    Spehro Pefhany
     
  14. Rich Grise

    Rich Grise Guest

    Well, the ends of either the heater wires or the heat tubes are right
    there at the power supply - either put the heater in a bridge and control
    it that way; if it's a liquid we need more information - for example,
    could you slide a thermistor up the line, catheter-style?

    Good Luck!
    Rich
     
  15. Rich Grise

    Rich Grise Guest

    This is a non-starter - he wants to heat the concrete _before_ it freezes.

    Hope This Helps!
    Rich
     
  16. _

    _ Guest

    Or wet the floor and crank the heat up; the places where the lines are will
    dry first.
     
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