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Delinquentes
TIMMMAYYYYYYY


Registered: 02/07/06
Posts: 543
Loc: Hidin' in a bowl of rice
Last seen: 3 months, 16 days
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Public Service Announcement: Hygrometer testing and calibration.
#5309869 - 02/17/06 09:29 AM (17 years, 11 months ago) |
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I just found this on a web site. It seems like a great way to get a grip on the actual accuracy of you analog or digital hygrometer.
Quote:
Hygrometers (relative humidity gauges) may not be accurate. Mechanical hygrometers are frequently in error by more than 20 percent. Calibrate your hygrometer by sealing it in a plastic bag along with a cup containing ? cup of water and ? cup of table salt (Figure 3). After at least 12 hours at room temperature, the meter should read 75 percent relative humidity. Electronic meters tend to be more accurate, but they should also be calibrated
Wanna get a little more technical?
No problem. Luckily, as nature would have it, when salt and water (NaCl and H2O for you studious types), are in a saturated solution at equilibrium, the resultant humidity is 75%. This gives are a fantastic reference point to calibrate our hygrometers.
-------------------- "The price of meat has just gone up, and your old lady has just gone down!" ~~ Zappa Click Here for a ghetto ozone generator Tek. Want to learn more about ozone as a bacteria killer? Click Here
Edited by Delinquentes (02/17/06 10:47 AM)
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hyphae
born to grow


Registered: 12/13/02
Posts: 6,228
Loc: the rain forests
Last seen: 12 years, 8 months
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Re: Public Service Announcement: Hygrometer testing and calibration. [Re: Delinquentes]
#5310138 - 02/17/06 11:33 AM (17 years, 11 months ago) |
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Also people should know the higher the RH reading the less accurate hygrometers are. I also use a damp washcloth wrapped around the hygrometer, the reading should be between 95-98% @ 74-77F. The best way IME is using a stationary psychrometer to calibrate hydrometers as these are very accurate at high RH's and totally take temps into consideration (relatively). Psychrometers use a chart BTW.
-------------------- Getting the most out of your casings!, A pinning strategy. Oyster Shell "Flour" $2 for 1lb. a hell of a deal Not what is overlay but rather what overlay is Gas Exchange vs. FAE "We all have priorities. I used a closet once setup a nice little lab trouble was all the shit that was in there ended up in the bedroom that pissed off the GF then I ended up dumping her as she was getting in the way of my sterile culture technique! Ya I got priorities too!!!"
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Roadkill
Retired Shroomery Mod


Registered: 12/11/01
Posts: 22,674
Loc: Montana
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Re: Public Service Announcement: Hygrometer testing and calibration. [Re: Delinquentes]
#5310186 - 02/17/06 11:44 AM (17 years, 11 months ago) |
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-------------------- Laterz, Road Who the hell you callin crazy? You wouldn't know what crazy was if Charles Manson was eating froot loops on your front porch! Brainiac said: PM the names with on there names, that means they have mushrooms for sale.
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agar
old hand


Registered: 11/21/04
Posts: 9,056
Loc: Somewhere Else
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Re: Public Service Announcement: Hygrometer testing and calibration. [Re: hyphae]
#5310195 - 02/17/06 11:47 AM (17 years, 11 months ago) |
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Delinquentes
TIMMMAYYYYYYY


Registered: 02/07/06
Posts: 543
Loc: Hidin' in a bowl of rice
Last seen: 3 months, 16 days
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Re: Public Service Announcement: Hygrometer testing and calibration. [Re: agar]
#5310245 - 02/17/06 12:14 PM (17 years, 11 months ago) |
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Sorry for redundant information Roadkill.
That's what I get for trying
-------------------- "The price of meat has just gone up, and your old lady has just gone down!" ~~ Zappa Click Here for a ghetto ozone generator Tek. Want to learn more about ozone as a bacteria killer? Click Here
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Roadkill
Retired Shroomery Mod


Registered: 12/11/01
Posts: 22,674
Loc: Montana
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Re: Public Service Announcement: Hygrometer testing and calibration. [Re: Delinquentes]
#5310283 - 02/17/06 12:26 PM (17 years, 11 months ago) |
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np bro!~
thats what this site is all about...
redundant information!~

tc
-------------------- Laterz, Road Who the hell you callin crazy? You wouldn't know what crazy was if Charles Manson was eating froot loops on your front porch! Brainiac said: PM the names with on there names, that means they have mushrooms for sale.
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hyphae
born to grow


Registered: 12/13/02
Posts: 6,228
Loc: the rain forests
Last seen: 12 years, 8 months
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Re: Public Service Announcement: Hygrometer testing and calibration. [Re: Roadkill]
#5310893 - 02/17/06 03:56 PM (17 years, 11 months ago) |
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BTW theres more than one way to calibrate a hygrometer Really!
-------------------- Getting the most out of your casings!, A pinning strategy. Oyster Shell "Flour" $2 for 1lb. a hell of a deal Not what is overlay but rather what overlay is Gas Exchange vs. FAE "We all have priorities. I used a closet once setup a nice little lab trouble was all the shit that was in there ended up in the bedroom that pissed off the GF then I ended up dumping her as she was getting in the way of my sterile culture technique! Ya I got priorities too!!!"
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Roadkill
Retired Shroomery Mod


Registered: 12/11/01
Posts: 22,674
Loc: Montana
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Re: Public Service Announcement: Hygrometer testing and calibration. [Re: hyphae]
#5310899 - 02/17/06 03:57 PM (17 years, 11 months ago) |
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yeah bro I know...
but if he had done a search he would have found them all.
-------------------- Laterz, Road Who the hell you callin crazy? You wouldn't know what crazy was if Charles Manson was eating froot loops on your front porch! Brainiac said: PM the names with on there names, that means they have mushrooms for sale.
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onetime
onetime


Registered: 11/13/03
Posts: 3,609
Last seen: 13 years, 1 month
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Re: Public Service Announcement: Hygrometer testing and calibration. [Re: Roadkill]
#5310941 - 02/17/06 04:16 PM (17 years, 11 months ago) |
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I can get mine calibrated by the control3 company every year I belive for only the cost of shipping both ways.
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See? Yes, with my own three eyes. Depression, Misspells , wanting everying thing i cant have haveing nothing i want
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hyphae
born to grow


Registered: 12/13/02
Posts: 6,228
Loc: the rain forests
Last seen: 12 years, 8 months
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Re: Public Service Announcement: Hygrometer testing and calibration. [Re: Roadkill]
#5311200 - 02/17/06 05:13 PM (17 years, 11 months ago) |
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Quote:
Roadkill said: yeah bro I know...
but if he had done a search he would have found them all.
Cool! I wasn't sure they were all out there?
-------------------- Getting the most out of your casings!, A pinning strategy. Oyster Shell "Flour" $2 for 1lb. a hell of a deal Not what is overlay but rather what overlay is Gas Exchange vs. FAE "We all have priorities. I used a closet once setup a nice little lab trouble was all the shit that was in there ended up in the bedroom that pissed off the GF then I ended up dumping her as she was getting in the way of my sterile culture technique! Ya I got priorities too!!!"
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