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Electronics thermistor temp sensor probs

Discussion in 'Modding' started by bigal, 12 May 2005.

  1. bigal

    bigal Fetch n Execute

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    ok, simplish question, i bought a circulator, basically a pump and a heater in a box for heating water and pumping it in a circle. I will be using it to heat up a tray of water to do etching in (another tray inside the water).

    anyway, the analogue temp guage is knacked, and i have a thermistor mounted in a copper tube thing which fits in the hole in the tank the analogue sensor fitted in.. so i want to get a digital meter, gut it and shove the guts in the analogue meter (cut a rectangle in the dial) to fill the hole in the fascure)

    trouble is where to get a digital meter that suits the thermistor..

    here are some rough calculations:


    150R resistance in RTP (room temp)
    will shove in boiling water tomoz

    any ideas though.. :blah:
     
  2. theshadow27

    theshadow27 What's a Dremel?

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    well, a highly technical calculus derivation yields: RE54J
    (Maplin, £8, -50-70c)
     
    Last edited: 13 May 2005
  3. bigal

    bigal Fetch n Execute

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    RE54U is not recognised, what was it BTW? :confused:
     
  4. theshadow27

    theshadow27 What's a Dremel?

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    Sorry! i got so wraped up in the math that i changed the J to a U.
    Dual Display In/Outdoor Thermometer
    •Indoor/outdoor temperature
    •Memory for highest/lowest temperature
    •Waterproof exterior sensor
    •Approx. 3m of thin cable
    •Wall or table mount
     
  5. bigal

    bigal Fetch n Execute

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    yeah but i need to use this thermistor really...

    otehrwise i would use something like YU07H or FE33L


    thanks anyway...

    any other ideas... :worried:
     
  6. cpemma

    cpemma Ecky thump

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    It's easy to use a thermistor to switch something at a set temperature, but to get them reading a range of temperature values you need a very complex meter. It's not a linear scale.
     
  7. bwgames

    bwgames Minimodder

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    I'll agree with this.
    My whole A2 physics c/w was based around thermistors and getting a temperature reading within the context of computer temperature modding. ;)

    It is possible to create an equation that will give an approximation for the temperature, but I wouldn't rely on it.
     
  8. bigal

    bigal Fetch n Execute

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    i have a meter that uses a thermistor, but that is about 10k on the thermistor... weirdness.

    Maby i should just buy a kit and try to encapsulate the sensor a bit.
     
  9. theshadow27

    theshadow27 What's a Dremel?

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    i left out the nonlinar part, but yeah, its hard. but a kit will be more expensive then the prebuilt meter...

    but anyway, if its in a computer you can get a SM bus chip going, but its going to have to read thrugh software.

    if you get a "waterproof" sensor, you can drill a hole in a pipe coupling and "pot" it in with 5 minute epoxy. :dremel:

    if you get the one i linked, you can compare air tempature in the case VS water temp in the case... which i think would be usfull.. maybe thats just me
     
  10. bigal

    bigal Fetch n Execute

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    dude, :read: (at least the first post) - its for a circulator pump system circulating etchant heating water in a jacket.

    maby i could pot the thermistor from this meter into something... will have to think that one over.. :)

    any more suggestions?
     
  11. theshadow27

    theshadow27 What's a Dremel?

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    wow-- i got confused between 2 threads. :jawdrop: :blush: :duh:

    but i stand by my reccomendation:

    montitoring the etchent temp vs air temp is important. i would not place the sensor directly in the etchent path, but rather cover it in teflon or something, before you shove it thrugh the hole and pot it with epoxy. etchent isnt that bad, untill it hits metal. gluing it to the outside of the tube wouldent be too bad, but it will be much slower to get temp changes.

    sorry! :wallbash:
     
  12. bigal

    bigal Fetch n Execute

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    it will be monitoring the water temp, this will be in the circulator unit itself.
     

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