Calibrating hygrometer

[kelltang93]

Do I really need to calibrate a hygrometer? The salt test isn't working, it doesn't look like slush. I put a table spoon of salt and a teaspoon of water it doesn't look like slush, I added a little bit more water, should it be fine for calibration?

 

[jher77]

You should calibrate it to see how far it is off. I may be close or it may be 15% off. You won't know until you test it. I've seen them close and way off with the same brand.

1 tablespoon sodium chloride, 1 teaspoon water is the right ratio.

What exact salt did you use?

Did you use an actual measurement tablespoon salt and teaspoon of water or just grab spoons out of the drawer to measure with?

 

[kelltang93]

You should calibrate it to see how far it is off. I may be close or it may be 15% off. You won't know until you test it. I've seen them close and way off with the same brand.

1 tablespoon sodium chloride, 1 teaspoon water is the right ratio.

What exact salt did you use?

Did you use an actual measurement tablespoon salt and teaspoon of water or just grab spoons out of the drawer to measure with?

I used kosher salt, salt. Do you want a pic? I used exact measurements with measuring utensils. I have Morton but there is another ingredient in it for caking.

 

[saysfaa]

Maybe not enough water?

https://www.backyardchickens.com/ar...incubator-thermometers-and-hygrometers.73634/

Uses 1 Tablespoon salt and a 1/2 Tablespoon of water. Stir well, let rest so as much water will be absorbed as possible, then pour off any water standing on top of the salt. Then bag it, and so on.

I poured off just a little; I don't think it was as much as half a teaspoon.

 

[kelltang93]

Maybe not enough water?

https://www.backyardchickens.com/ar...incubator-thermometers-and-hygrometers.73634/

Uses 1 Tablespoon salt and a 1/2 Tablespoon of water. Stir well, let rest so as much water will be absorbed as possible, then pour off any water standing on top of the salt. Then bag it, and so on.

I poured off just a little; I don't think it was as much as half a teaspoon.

Thanks

 

[jher77]

The ingredient "salt" can mean many things. That label misleading people. Look at the description here:
Kosher Salt
It says "It even contains 53% less sodium by volume compared to table salt".

So that is not 100% sodium chloride which is needed for the salt test to get 75% relative humidity. Lite Salt is about 50% sodium chloride and 50% potassium chloride but with that description it sounds like it is more potassium chloride (or even magnesium chloride or more filler) than sodium chloride.

Basically you used the wrong salt to test with. Try the morton if it is real salt (near 100% sodium chloride). If it contains iodine or an anticacke it will probably be fine. Try and see.

 

[kelltang93]

The ingredient "salt" can mean many things. That label misleading people. Look at the description here:
Kosher Salt
It says "It even contains 53% less sodium by volume compared to table salt".

So that is not 100% sodium chloride which is needed for the salt test to get 75% relative humidity. Lite Salt is about 50% sodium chloride and 50% potassium chloride but with that description it sounds like it is more potassium chloride (or even magnesium chloride or more filler) than sodium chloride.

Basically you used the wrong salt to test with. Try the morton if it is real salt (near 100% sodium chloride). If it contains iodine or an anticacke it will probably be fine. Try and see.

Ok