thermal sensors

Discussion in 'The Projects Forum' started by amperahe, Aug 11, 2007.

  1. amperahe

    Thread Starter New Member

    Aug 11, 2007
    7
    0
    good day!
    can anyone teach me how to make a simple switch using thermal sensors.. or how can i use thermal sensor..
    knows nothing here:D
    i would be using it to automate my cooling system
     
  2. nanovate

    Distinguished Member

    May 7, 2007
    665
    1
    There are thermal switches you can buy that open or close at a set temp. I have tried one by Cantherm a while back.
     
  3. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    There are a couple different kinds...

    Thermostats are switches which turn on or off at a given temperature. They are adequate for roughly maintaining an approximate temperature. These are inexpensive.

    Thermistors (thermally dependent resistors) change their resistance as temperature changes. Constant current through them results in a voltage either proportional or inversely proportional to temperature. They can be a part of a more complex control system.

    Thermocouples produce a tiny voltage in very accurate proportion to the temperature. These also can be part of a more complex and very accurate control system.

    If a thermostat won't provide an even enough control, a "PID" system (Proportional - Integral - Derivative)can be used to "predict" when the cooling system should turn on and off. http://en.wikipedia.org/wiki/PID_controller

    How tight a control is needed for your cooling system? (And how cold will it go? Most thermostats and thermistors wont work for super-cold temperatures. Some thermocouples will.
     
  4. amperahe

    Thread Starter New Member

    Aug 11, 2007
    7
    0
    not that super cold sir..
    im livin in the tropics.. so temperature here ranges from 30-36 degrees celcius..a bit hot
    and i will be using misting for my cooling system..should i use thermostats?
     
  5. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    I predict thermostats will suffice nicely!
     
  6. amperahe

    Thread Starter New Member

    Aug 11, 2007
    7
    0
    thank you very much!
     
Loading...