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Calibrating Hygrometer and Salt question

JHolmes763

JHolmes763

Drinkin' the koolaid
Joined
Oct 12, 2006
Messages
4,739
Question 1: I have the following adjustable hygrometer. Basic model. It always reads 80% in the salt test and I can't get it to adjust down to 75%. I turn the little calibration wheel 5 clicks in either direction, but it still settles back to 80%. Am I missing a step? Is there a trick that I'm forgetting to get this reading correctly? I obviously lost the little instruction sheet. :)

HYGROSET1.gif


Question 2: Does it matter what kind of salt you use for the calibration? My wife buys low sodium salt and we have some kosher salt, too. I've been using the low sodium salt, but the hygrometer reads a steady 80% all the time. Is this still giving me the real 75% that I need for calibration?

Thanks. :)

---John Holmes...
 
I also have an adjustable hygrometer. After turning the wheel the appropriate number of clicks, the set button must be pressed. Not sure which one it is on yours, but probably the smaller one. On mine the largert button is to change the temperature reading from F to C.

Hope this helps.
 
Glad to help.

As far as the salt goes, I would probably use the kosher salt. The low sodium salt is probably a mixture of Sodium Chloride and Potasium Chloride. I don't know if this will product the desired 75% RH.

I think I read a thread a while back that gave the RH percentages that will be achieved with various salts. Don't remember what it was titled though.

Dave
 
Just in case someone else needs the directions somday here they are.

1. Place the hygrometer in the Boveda Calibration Kit or in a Ziplock with a salt slurry.
2. After 24-36 hours read the hygrometer and determine the inaccuracy if any. For this example we will say it displays 70% and the test standard is 75%, this tells us the hygrometer is displaying 5% low.
3. Remove the hygrometer from the bag.
4. Turn the setting knob (the large round knob) 5 clicks clockwise. Very IMPORTANT, while turning the knob the display will NOT change in conjunction with the number of clicks. The display may move but that is just due to the hygrometer reading and adjusting for the room rh that you are in. Turning the adjustment knob will NOT affect the display reading.
5. After turning the adjustment knob press the reset button (the small recessed button on the front of the hygrometer). This resets the hygrometer for the inaccuracy that you have. Pressing this button will not make the display change.
6. Return the hygrometer to the calibration kit or the ziplock.
7. Let stand for 24-36 hours and check the accuracy of the hygrometer.
8. If it is still off by a little repeat the above steps.
 
Thanks Viper. Did just that and she's sittin' pretty at 75% now. :)
 
Sorry for the threadjack, but do they make Boveda packs that create a 65% environment?
 
I have the 65% and 69% in stock, the 72% are backordered from Humipak.
If you are interested, send me a PM or click on the link in my sig or the sponsor page

Dave
 
Boomer52 said:
I think I read a thread a while back that gave the RH percentages that will be achieved with various salts.
Click to expand...

Here you go.... mixing these salts into a slurry/paste with distilled water will produce the following RH:

LITHIUM BROMIDE 6.37%
LITHIUM CHLORIDE 11.30%
POTASSIUM ACETATE 22.51%
MAGNESIUM CHLORIDE 32.80%
POTASSIUM CARBONATE 43.16%
MAGNESIUM NITRATE 52.89%
SODIUM BROMIDE 57.57%
POTASSIUM IODIDE 68.86%
SODIUM CHLORIDE 75.30%
POTASSIUM CHLORIDE 84.34%
POTASSIUM SULFATE 97.30%
 
Allofus123 said:
Boomer52 said:
I think I read a thread a while back that gave the RH percentages that will be achieved with various salts.
Click to expand...

Here you go.... mixing these salts into a slurry/paste with distilled water will produce the following RH:

LITHIUM BROMIDE 6.37%
LITHIUM CHLORIDE 11.30%
POTASSIUM ACETATE 22.51%
MAGNESIUM CHLORIDE 32.80%
POTASSIUM CARBONATE 43.16%
MAGNESIUM NITRATE 52.89%
SODIUM BROMIDE 57.57%
POTASSIUM IODIDE 68.86%
SODIUM CHLORIDE 75.30%
POTASSIUM CHLORIDE 84.34%
POTASSIUM SULFATE 97.30%
Click to expand...

Wonder what kind of salt Morton's is?

Bart
 
YOU MUST USE REGULAR TABLE SALT, like Mortons.
Any other salt will give a different reading.
Morton's is Sodium Chloride.

Do not use Sea Salt, Salt Peter, Rock Salt, Ice Melt
or any other kind of salt. They are different.

I haven't checked the validity of the table of salts
posted. Don't use a slurry. If you have a slurry
add grains of salt until all of the grains are wet,
but no liquid is present. A slurry is too wet for
hygro calibration. It should look like damp sand.

I use the salt test, and it works EVERY TIME.

Chemyst :cool:
 
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