How does a wafer thermostat work?

Discussion in 'Incubating & Hatching Eggs' started by CityGirlintheCountry, May 5, 2009.

  1. CityGirlintheCountry

    CityGirlintheCountry Green Eggs and Hamlet

    6,950
    71
    311
    Jul 7, 2007
    Middle TN
    I'm assuming a wafer thermostat is what is in the Hovabator 1602- flat metal disks. They are threaded to the end of a metal post that sticks up through the styrofoam. To adjust warmer I turn it so that the disks get closer to the top of the incubator. To adjust cooler I turn it so that the disks move towards the bottom of the incubator.

    Why? How does this make it warmer or cooler?
     
  2. silkiechicken

    silkiechicken Staff PhD Premium Member

    It turns a switch on and off as it contracts or expands respectively.
     
  3. MandyH

    MandyH You'll shoot your eye out!

    As the incubator warms up, the wafer expands and trips the switch to cut the heat off. As the air in the incubator cools, the wafer contracts, pulling it away from the contact, thus tripping the switch to cut heat back on.
     
  4. CityGirlintheCountry

    CityGirlintheCountry Green Eggs and Hamlet

    6,950
    71
    311
    Jul 7, 2007
    Middle TN
    Yay! Smart people!

    Thanks for the help. I was so focused on getting the thing assembled that I didn't pay much attention to how it all worked. Of course now it's full of eggs and I can't tear it apart!
     
  5. m2wandc

    m2wandc Chillin' With My Peeps

    905
    0
    141
    Apr 19, 2009
    I just picked up a very old incubator from a friend...and I noticed it has a screw like thing sticking out of the top with sharpie pen that says "hot" with an arrow...so I'm guessing it's one of these thermostat wafer switches...once I get a chance to really check this incubator out, I'll know more...but it's all so interesting! I haven't hatched anything yet...gearing up to [​IMG]
     
  6. CityGirlintheCountry

    CityGirlintheCountry Green Eggs and Hamlet

    6,950
    71
    311
    Jul 7, 2007
    Middle TN
    Since writing this thread, I have since switched from the 1602 with wafer thermostat to a Hovabator with the fan and other thermostat. The 1602 was very unreliable. I'm finding this new one to be much more consistant. In fact, I have run the new one almost constantly since unpacking it and it is working like a trooper! In practice the wafer thermostat was very tricky.
     
  7. Fowlman4

    Fowlman4 Out Of The Brooder

    44
    2
    26
    Jun 24, 2008
    Did you consider installing a Circulated Air Fan Kit for Hova Bator Incubators inside your 1602? That would greatly improve its reliability by stabilizing the temperature inside the 1602!
     
  8. CityGirlintheCountry

    CityGirlintheCountry Green Eggs and Hamlet

    6,950
    71
    311
    Jul 7, 2007
    Middle TN
    You do realize this thread is over three years old, right? I am two incubators past the 1603 now. :)
     

BackYard Chickens is proudly sponsored by