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water temperature sensor

Discussion in 'Electronic Design' started by kostas, Jan 11, 2005.

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  1. kostas

    kostas Guest

    Hello,

    i want to build a water temperature sensor. I have seen some nice
    thermometers in maxim site but i don't know if they can't stand the
    shock of submerging them into distilled water or coolant fluid for
    cars??? Any other ideas for underwater temperature sensors???
     
  2. Mark

    Mark Guest

    Thermistor
     
  3. You could always encase one in ordinary two-part epoxy (if you can live
    with the thermal lag). As long as you don't exceed the max temp of the
    device, you shouldn't have any problem. IMO, two part epoxy is a
    godsend, it's right up there with WD-40 and duct tape.
     
  4. If you need better water proofing, melt the end of a piece of glass
    tubing closed with a propane torch and slide the sensor down that
    tube, sealing with epoxy, if necessary. The lag will be increased.
     
  5. Mark Jones

    Mark Jones Guest


    Hi, check this out:
    http://www.allelectronics.com/cgi-bin/category.cgi?&item=LM34DZ

    Be sure to read the "spec sheet" (datasheet) also.

    -- "The knowledge is worth 10x more than the solution." MCJ 200401
     
  6. ScottL

    ScottL Guest

    Easiest solution I can think of is "off the shelf". Go to an auto
    parts store and get a temp sending unit for something simple like a '80
    Chevy 305. One terminal to ground resistance. Using iced to boiling
    water figure your resistances and plot from there. You can use a piece
    of PVC drilled and tapped then spliced into a heater or radiator hose
    to put it into the flow.

    VW, as in 80's Rabbits used a two stage temp switch that powered the
    radiator fan. It would handle a good load without external relays.

    -ScottL
     
  7. | Hello,
    |
    | i want to build a water temperature sensor. I have seen some nice
    | thermometers in maxim site but i don't know if they can't stand the
    | shock of submerging them into distilled water or coolant fluid for
    | cars??? Any other ideas for underwater temperature sensors???
    |

    This might be of interest.
    http://www.raytek-northamerica.com/cat.html?cat_id=2.3.5
    Dan
     
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