Testing hygrometers with HumiPak?

[Hammerhead]

I know the salt test is recommended, but I just got a humipack in a box of Fuentes, and thought it might be a way to test the accuracy of my hygrometers.

Anyone know of a reason why this might be a bad idea?

[RonC]

its not a bad idea, its the best way to calibrate a hygrometer.

[Andyman]

As long as it is a fresh humidi-Pak and it is in a sealed environment it will work great..

[SeanGAR]

Originally Posted by RonC

its not a bad idea, its the best way to calibrate a hygrometer.

Well, saturated salt is known to be extremely accurate .. bovedas report good accuracy but its lower than salt. Its probably adequate for calibration though.

[RonC]

the Boveda technology is based on saturated salt solutions. The Boveda claims accuracy to within 2%. That claim is based on use in a humidor that will not be airtight. If calibrating in an airtight container, the accuracy is within 2/10ths of a %. That info is from Tim at Humidipak.

[Hammerhead]

Originally Posted by RonC

the Boveda technology is based on saturated salt solutions. The Boveda claims accuracy to within 2%. That claim is based on use in a humidor that will not be airtight. If calibrating in an airtight container, the accuracy is within 2/10ths of a %. That info is from Tim at Humidipak.

Ron, there's an interesting computer printed set of numbers along one edge of the pack on the back that says: 245 5 - 69%. Can I presume that this means the particular run of packs from this batch are tested to 69% rather than 70%? That's pretty impressive if they can control their QC to that degree of accuracy.

[RonC]

The Bovedas come in 65,69, and 72%. I am not sure what % they use for the Fuente boxes.

[Andyman]

Originally Posted by Hammerhead

Ron, there's an interesting computer printed set of numbers along one edge of the pack on the back that says: 245 5 - 69%. Can I presume that this means the particular run of packs from this batch are tested to 69% rather than 70%? That's pretty impressive if they can control their QC to that degree of accuracy.

they found it was cheaper to produce them at 69% than at 70%. I beleive they are accurate within 1%

[Hammerhead]

Originally Posted by RonC

The Bovedas come in 65,69, and 72%. I am not sure what % they use for the Fuente boxes.

This came directly out of a box of Hemingway Signatures we just bought last weekend, so the answer is 69. Nice number!

[SeanGAR]

Originally Posted by RonC

the Boveda technology is based on saturated salt solutions. The Boveda claims accuracy to within 2%. That claim is based on use in a humidor that will not be airtight. If calibrating in an airtight container, the accuracy is within 2/10ths of a %. That info is from Tim at Humidipak.

If that is the case, they are probably using cupric or cobalt chloride for 65%, lithium acetate for 69% and strontium chloride for 72%. One of the problems with these salts is that their relative humidity produced is affected by temperature. Generally the difference is 2% over the temperature range 15-20C. Sodium chloride does not vary significantly over that temperature range. So as far as calibrating a hygrometer is concerned, there is nothing as accurate and insensitive to temperature as saturated salt (sodium chloride).

[NCRadioMan]

Originally Posted by SeanGAR

If that is the case, they are probably using cupric or cobalt chloride for 65%, lithium acetate for 69% and strontium chloride for 72%. One of the problems with these salts is that their relative humidity produced is affected by temperature. Generally the difference is 2% over the temperature range 15-20C. Sodium chloride does not vary significantly over that temperature range. So as far as calibrating a hygrometer is concerned, there is nothing as accurate and insensitive to temperature as saturated salt (sodium chloride).

Plus, it's cheaper!!

NCRM