How To Calibrate A Hygrometer For Your Incubator.

How To Calibrate A Hygrometer For Your Incubator.

Are you wondering if the humidity level in your incubator is spot on. Humidity is second only to temperature when hatching eggs.

Different incubators need different humidity levels, so you’ll need to do some research to see what your personal needs are. The humidity in your house, outside humidity and your location and elevation level also have bearing.

Read on to learn how to calibrate your hygrometer correctly with the Salt Test Method.

What you’ll need.

  • 1/2 cup table salt (Note: do not use iodized salt.)
  • approximately 1/4 cup water
  • cup or jar
  • hygrometer
  • large re-sealable freezer bag

1. Put 1/2 cup of salt in the cup or jar and add the water. Stir it up a little to saturate all the salt (the salt will not dissolve, it will just look like wet sand). If you see water floating on top of the salt, you’ve added too much water. Easy fix for this is to grab a paper towel and soak up all of the excess water.

2. Put the salt and water mixture in a re-sealable plastic bag (zip-lock). Add the hygrometer and seal the bag. (Note: make sure none of the salt and water mixture comes in direct contact with the hygrometer.) Make sure there is some air in the bag… don’t press it out.

3. Leave the sealed bag with the salt and water mixture and the hygrometer set at room temperature for about 8 – 12 hours in a location where the temperature is fairly constant and there are no drafts.

4. After 8 – 12 hours, check the reading on the hygrometer. Read it while still in the bag, as removing it will cause the reading to fluctuate immediately.

The relative humidity reading on the hygrometer in the sealed bag with the salt and water mix should be 75 percent. If it reads higher or lower than 75 percent, you will need to adjust your hygrometer or how you read it.

5. For adjustable hygrometers, adjust it to read 75 percent. You will need to do this very quickly, or remember how much you need to adjust the setting. For example: If your hygrometer reading says 77 percent, you will need to adjust it down two percentage points. If it reads 70 percent, adjust it up 5 percentage points.

If yourhygrometer is not adjustable, just make a note of what 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. You need to keep this in mind every time you read your hygrometer and not forget.

This should help you to get the actual relative humidity in your incubator.

Changes in the relative humidity may take a while to register accurately on a hygrometer. It’s very important to make sure you always give a hygrometer a couple hours to stabilize before taking a reading.

Hope this hygrometer calibration tip helps you have success hatching your next clutch of eggs.

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  1. A first journey journal with an incubator. Notice: includes “graphic” chick embryo photos « pureandsimplelife - [...] but never checked to make sure it was calibrated correctly.  I’ve found how to with the “salt method”, and ...

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