Big temperature difference between the bottom and top of my working 1202 incubator

Discussion in 'Incubating & Hatching Eggs' started by bardies, Mar 19, 2013.

  1. bardies

    bardies Songster

    980
    107
    181
    Jan 16, 2012
    Newcastle, Ok
    The fan works, the temperature on the thermometer reads steady, but can tell it is much cooler at the bottom rack than where the thermometer is at the top. I have the same problem with a homemade hatcher....again, even with the fan going.

    I am wondering if I should heat it up to much higher at the thermometer just to get the temperature correct where the eggs will be.

    Any advice?

    Oh, on the 1202, both center vents are open. On the home made - there is one vent hole near the top, and it is half open.

    Thanks!
     
  2. Mahonri

    Mahonri Urban Desert Chicken Enthusiast Premium Member

    30,362
    181
    456
    May 14, 2008
    North Phoenix
    My Coop
    I am using my "Brinsea Spot Check Thermometer". (well worth buying!)

    I put the end of it right at the middle part of the egg. If it's close to 100 there, you are good to go.
     
  3. Bill 101

    Bill 101 Chirping

    385
    20
    90
    Feb 1, 2013
    Oregon
    I'm sure you are right, but unless you checked the temperature with a thermometer, guessing isn't going to tell you much. I had a GQF with a electronic heat control. it ran perfectly & held temperature well, UNTIL I started checking temperature at each rack level. It had a 4 degree drop top to bottom, but also had a 1 to 2 degree drop front to back. I sold it.
     
  4. bardies

    bardies Songster

    980
    107
    181
    Jan 16, 2012
    Newcastle, Ok
    Sheesh! I never thought about variation front and back...but I see that happening - now using thermometers to check the little hatcher. Right now the two are in my garage (low 60's) - it has a 2k gallon pond in there, so I thought it would be a good place with regard to humidity. But perhaps thats part of the problem, bringing colder air in - relying too much on the heater.
    Bill, when you found your problems, was it in a cooler environment?
     
  5. Bill 101

    Bill 101 Chirping

    385
    20
    90
    Feb 1, 2013
    Oregon
    Quote: NO, I set it up in my living room. (much to my wife's dismay) House had central heat & air, so the room was pretty stable. I never hatched eggs in it. I bought it second hand. It was in excellent condition. I ran a bunch of temperature test. Front & back at each tray & top to bottom. I didn't like the variation in temperature, although everyone said they had great hatches from them. I am an accuracy fanatic. I have a couple of Turn-X & a Roll - x that have fantastic stability & accuracy, so I sold the GQF

    Most Incubator Manufacturers recommend the temperature in the area their in be at least 70 degrees. I believe that is because there is not much insulation in incubators so the heat loss from cooler environments tend to make them unstable
     
  6. crowsnestfarms

    crowsnestfarms In the Brooder

    47
    3
    26
    Mar 10, 2013
    Northeast Arkansas
    Do you have a place at top or bottom to put in a couple of PC fans aiming either straight up or straight down? I think what you are noticing is called thermal layering and more fans should help circulate the air better so the temp is more consistent from top to bottom. Just my two cents worth.........
     
  7. dbcooper02

    dbcooper02 Songster

    609
    17
    164
    Apr 20, 2007
    SW Washington
    I run my 3 1202s and 1250 hatcher at 99.5 using just the GQF probe thermometer there at the top. I have never thought or cared to check the temperature elsewhere, nor will I now.
    They operate in a very well insulated, but unheated 10X12 room. On their own they maintain the room at a comfortable temperature.
    Eggs from any location in the incubator hatch on time as expected. Why mess with success?

    Here are some thoughts.
    Check your door seal for leaks. A lit candle passed around the perimeter will reveal drafts.
    Close the vents down a bit. I run mine about 1/2 open.
    Run a couple of test hatches. Try marking eggs as to location and distribute 3 or 4 at the front and rear of each tray.
    See if they all hatch together or if suspected cooler areas hatch later.
     
    Last edited: Mar 20, 2013
  8. crowsnestfarms

    crowsnestfarms In the Brooder

    47
    3
    26
    Mar 10, 2013
    Northeast Arkansas
    I wonder if the OP has made any progress improving the consistency of the incubator temps?
     

BackYard Chickens is proudly sponsored by