here is How to calibrate thermometers

Discussion in 'Incubating & Hatching Eggs' started by h4ppy-chris, Nov 13, 2011.

  1. h4ppy-chris

    h4ppy-chris Chillin' With My Peeps

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    Oct 3, 2011
    burnley, UK
    Whenever you purchased a new thermometer and about to use it for the first time, you need to calibrate it. Thermometers will also need to be calibrated whenever they are dropped or when going from one temperature extreme to another. Thermometers are a critical measuring equipments for temperature to ensure good hatch rates.

    There are two methods that you could use to calibrate thermometers -

    Ice Point Method - Fill a container with crushed ice and water. Ensure that the container have enough crushed ice to provide an environment of 32 degrees F, so you may need to add more ice into the container during the process. It will takes about 4 to 5 minutes for the mixture of water to stabilized. Then insert the thermometer which needs to be calibrated into the appropriate immersion depth. Hold the thermometer away from the bottom and sides of the container to avoid error. If your thermometer is not accurate at 32 degrees F, adjust the thermometer accordingly.

    Boiling Point Method - Fill a container with distilled water and heat it up. After the temperature in the water has reached the boiling point, insert the thermometer . Be sure to leave at least a two inch gap between the thermometer sensing element and the bottom and sides of the container to avoid error. If your thermometer is not accurate at 212 degrees F, adjust the thermometer accordingly.
     
  2. rebelcowboysnb

    rebelcowboysnb Confederate Money Farm

    I calibrate all mine in a 100 degree water bath using a medical grade thermometer as reference.

    With a well made glass thermometer the ice water thing works ok cause its accuracy is linear. If its 2 degrees off at 32 degrees it should be very close to 2 degrees off at 100 degrees. New digital and cheep glass thermometers are not linear. Checking the temp at 32 degrees only tells you how far off it is at 32 degrees. It may be the same at 100 or it may be completely different an usually is. People also often do the ice bath wrong an get a off reading too.

    Boiling water has the same linear issue but it has another. Water does not boil at 212 everywhere. Right here it boils around 208. Unless you have a ocean front view you probably don't live at sea level an water probably does not boil at 212. You could look up your altitude an match it to a boiling point chart then do the test but you still have the linear issue.
     
  3. h4ppy-chris

    h4ppy-chris Chillin' With My Peeps

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    Oct 3, 2011
    burnley, UK
    Quote:.
    thank you rebelcowboysnb some very good input there. i have read all your web site some very good reading on there thank you.
     

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