humidity 89% !!!!

Discussion in 'Incubating & Hatching Eggs' started by muddyhorse, Jan 14, 2010.

  1. muddyhorse

    muddyhorse Chillin' With My Peeps

    Aug 11, 2009
    Bloomsdale, MO
    last night I calibrated my new meter. I put 1/4 cup of salt in a coffe cup and added warm water. this morning it read 89% instead of 75% like it was supposed to. What did I do wrong? eggs are arriving in a couple of hours [​IMG] I need to get this fixed soon. thanks
  2. Painted Spirit

    Painted Spirit Chillin' With My Peeps

    Oct 18, 2009
    Is your hydo adjustable? If not than use as is knowing to add or subtract what you know it is off by - if you want 50% it will read 64%. That does seem like alot to be off though for a new meter. I'd run to Wally world and get a second Springfield to use as a back up and send this first one back for a replacement if its not adjustable. I usually have two and a third temp in mine to check things.
  3. joebryant

    joebryant Overrun With Chickens

    Quote:Do it again.

    How to Calibrate a Hygrometer
    by Lianne McLeod, DVM
    *******To calibrate a hygrometer you will need:
    · 1/2 cup table salt
    · approximately 1/4 cup water
    · coffee cup
    · hygrometer
    · large re-sealable freezer bag
    1. Place 1/2 cup of salt in the coffee cup, and add the water. Stir for a bit to totally saturate the salt (the salt won't dissolve, it will be more like really wet sand).
    2. Place the salt/water mix in a re-sealable plastic bag, along with the hygrometer, and seal the bag. Note: make sure none of the salt/water mix comes in direct contact with the hygrometer.
    3. Set this bag aside at room temperature for 8-12 hours, in a location where the temperature is fairly constant.
    4. After 8-12 hours, check the reading of the hygrometer. It is best to read it while still in the bag.
    The relative humidity in the sealed bag with the salt/water mix should be 75 percent (mine read about 72 percent).
    5. For adjustable hygrometers, adjust to read 75 percent. You will have to do this very quickly, or remember how much you need to adjust the setting (e.g. mine read 72 percent rather than 75 percent, so I would need to adjust the dial up 3 percentage points).
    If yours is not adjustable (like mine), simply make a note of how "off" your hygrometer reads. If it reads below 75 percent, you will need to add the difference to your actual readings. If your hygrometer read above 75 percent on the calibration, you will need to subtract the difference from your actual reading.
    In my example: after sitting in the bag, my hygrometer read 72 percent, when it should have read 75 percent -- a difference of 3 percent. I now add 3 percent to the readings I take on the hygrometer (e.g. in a tank) to get the actual relative humidity.
    Remember: always give a hygrometer about 2 hours to stabilize before taking a reading, as changes in the relative humidity may take a while to register accurately on a hygrometer.
  4. Intheswamp

    Intheswamp Chillin' With My Peeps

    Mar 25, 2009
    South Alabama
    The couple of times I've done this it seems the actual amount of water is just a tad shy of 1/4 cup...using a complete 1/4 cup seems to cover the salt completely with water and I believe (could be wrong) that what we're after is "very, very wet salt" rather than "submerged salt".

    Best wishes,
  5. muddyhorse

    muddyhorse Chillin' With My Peeps

    Aug 11, 2009
    Bloomsdale, MO
    Thanks I had done 1/4 c. salt 1/2 c. water [​IMG] just picked up my Std cochin frizzle eggs from P.O. they look great. [​IMG] [​IMG]

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