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| Testing Hygrometers http://luthiersforum.com/forum/viewtopic.php?f=10101&t=50269 |
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| Author: | Dave Rickard [ Tue Feb 06, 2018 2:54 pm ] |
| Post subject: | Testing Hygrometers |
I use potassium Bicarbonate in wine making so I have it on hand. Rather than buy Potassium Carbonate can I use Potassium Bicarbonate to check a hygrometer? |
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| Author: | Colin North [ Tue Feb 06, 2018 3:04 pm ] |
| Post subject: | Re: Testing Hygrometers |
Potassium Carbonate is used commonly for checks because the RH of a saturated solution is 43 which is useful for us builder types, and doesn't vary a lot with temperature. Good luck finding what the RH for a saturated solution of the bicarbonate, I googled it and had no luck. P.S. Fortunately, Potassium carbonate is pretty cheap, try ebay? |
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| Author: | Dave Rickard [ Tue Feb 06, 2018 3:11 pm ] |
| Post subject: | Re: Testing Hygrometers |
Thanks Colin.Yep I tried googling it also with no luck. I was relying on the wisdom of the group. I may have to get a crow bar and pry my wallet open and buy the right stuff. |
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| Author: | arie [ Tue Feb 06, 2018 3:14 pm ] |
| Post subject: | Re: Testing Hygrometers |
a $5.99 calibration kit won't do? |
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| Author: | bcombs510 [ Tue Feb 06, 2018 5:47 pm ] |
| Post subject: | Re: Testing Hygrometers |
arie wrote: a $5.99 calibration kit won't do? FWIW, the two calibration kits I saw on Amazon test at 75% and 35%. I read somewhere (maybe here  ) that assuming that the reading is linear might be a mistake. Meaning, assuming that +1 at 75% would just be +1 at 45% is not guaranteed. So the potassium carbonate test which I think hits 43% is closer to the luthier Goldilocks zone.Sent from my iPhone using Tapatalk |
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| Author: | J De Rocher [ Tue Feb 06, 2018 6:26 pm ] |
| Post subject: | Re: Testing Hygrometers |
https://www.amazon.com/dp/B00J5SWLK0/re ... 1_ST1_dp_1 This amount is good for years of tests. |
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| Author: | Dave Rickard [ Tue Feb 06, 2018 10:19 pm ] |
| Post subject: | Re: Testing Hygrometers |
Well now y'all now how cheap I am. |
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| Author: | Hesh [ Tue Feb 06, 2018 10:58 pm ] |
| Post subject: | Re: Testing Hygrometers |
Dave Rickard wrote: Well now y'all now how cheap I am. Bet I'm cheaper.... Three words: Wet Bulb Testing What Brad said about these various chemical tests have sweet spots for accuracy in terms of range where a Wet Bulb Test could care less. Two cheap lab thermometers and either a vac or fan and you're in business. |
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| Author: | jfmckenna [ Tue Feb 06, 2018 11:18 pm ] |
| Post subject: | Re: Testing Hygrometers |
You used to be able to get those Psychro-Dyne psycrometers for pretty cheap on eBay and they are perfect for calibrating cheap hygrometers. |
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| Author: | Dave Rickard [ Wed Feb 07, 2018 6:48 am ] |
| Post subject: | Re: Testing Hygrometers |
[quote="Hesh" Bet I'm cheaper.....[/quote] They call me "Nickel Dave" When I pry my wallet open moths come flying out I'd bet ya but I don't want to take the risk. Thanks guys |
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| Author: | arie [ Wed Feb 07, 2018 3:10 pm ] |
| Post subject: | Re: Testing Hygrometers |
J De Rocher wrote: https://www.amazon.com/dp/B00J5SWLK0/ref=pe_385040_30332190_TE_3p_M3T1_ST1_dp_1 This amount is good for years of tests. "Loud Wolf" brand.. omfg -how loud is the wolf? |
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| Author: | Bryan Bear [ Thu Feb 08, 2018 12:42 am ] |
| Post subject: | Re: Testing Hygrometers |
I think I’m going to fill a big bucket with wet potassium carbonate in the shop and keep the door closed. Then I won’t need a hygrometer because the room will always be 43%
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| Author: | joe white [ Thu Feb 08, 2018 9:27 am ] |
| Post subject: | Re: Testing Hygrometers |
Brilliant! ![[:Y:]](./images/smilies/smiley20.gif "Thumbs Up")
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| Author: | doncaparker [ Thu Feb 08, 2018 1:08 pm ] |
| Post subject: | Re: Testing Hygrometers |
Bryan Bear wrote: I think I’m going to fill a big bucket with wet potassium carbonate in the shop and keep the door closed. Then I won’t need a hygrometer because the room will always be 43% Sploosh! My mind is officially blown. "No, man! We're IN the bag! Right now!" |
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| Author: | bcombs510 [ Thu Feb 08, 2018 1:22 pm ] |
| Post subject: | Re: Testing Hygrometers |
I was kind of surprised how much heat that little dish kicked out when I did this recently. Sent from my iPhone using Tapatalk |
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| Author: | Bob Shanklin [ Thu Feb 08, 2018 11:18 pm ] |
| Post subject: | Re: Testing Hygrometers |
jfmckenna wrote: You used to be able to get those Psychro-Dyne psycrometers for pretty cheap on eBay and they are perfect for calibrating cheap hygrometers. They still are cheap on fleabay, and they are fantastic for calibrating. Bob |
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| Author: | Michael.N. [ Fri Feb 09, 2018 3:43 am ] |
| Post subject: | Re: Testing Hygrometers |
bcombs510 wrote: I was kind of surprised how much heat that little dish kicked out when I did this recently. Sent from my iPhone using Tapatalk With Potassium carbonate you get a reaction that produces heat. Shouldn't be enough to set the place on fire but not sure about a bucketful. |
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| Author: | doncaparker [ Fri Feb 09, 2018 6:33 am ] |
| Post subject: | Re: Testing Hygrometers |
I suppose the bucket of wet potassium carbonate doesn’t pass the “how will I explain this to the paramedics” test. Darn. |
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| Author: | Bryan Bear [ Fri Feb 09, 2018 10:04 am ] |
| Post subject: | Re: Testing Hygrometers |
I suppose I should say, for the record, I am not keeping an open bucket of potassium carbonate in my workshop. My typing tends to look the same whether my tongue is in my cheek or not. . . I'm glad to hear that the reaction gives off heat though. It will give me a little more time before my hide glue gels. Wait, there I go again. . .
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| Author: | bcombs510 [ Fri Feb 09, 2018 10:13 am ] |
| Post subject: | Re: Testing Hygrometers |
Porcelain dishes suspended from the ceiling approximately 3 feet above the work area. Should be able to get rid of any heat lamps you might be using. |
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