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OfflineMeanMark
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Registered: 12/20/99
Posts: 22
Loc: western oz
Last seen: 16 years, 2 months
humidity help
    #374492 - 08/19/01 11:08 AM (16 years, 4 months ago)

hey, I need help in figuring out how to increase the humidity in my grow room. Do I attach a humidifier? Do I mist alot more? I am using a plastic grow room similar to mushroom magic grow rooms. I use perlite and water underneath the straw. Just cannot get the humidity high enough. All help and comments very appreciated.
Mean Mark

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OfflineAnnoA
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Re: humidity help [Re: MeanMark]
    #374499 - 08/19/01 11:21 AM (16 years, 4 months ago)

> Just cannot get the humidity high enough.
What humidity do you have? How do you measure it? Do you have condensation on the walls of the terrarium? Is the terrarium closed tight?

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OfflineMeanMark
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Registered: 12/20/99
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Loc: western oz
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Re: humidity help [Re: Anno]
    #374513 - 08/19/01 11:48 AM (16 years, 4 months ago)

the humidity is at 75%, I have a fairly cheap gauge...and I definitely have all kinds of condensation on the sides of the grow room. And the room is as airtight as I could make it.

'cuse me while I kiss the sky....

Edited by MeanMark on 08/19/01 10:51 AM.



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OfflineAnnoA
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Re: humidity help [Re: MeanMark]
    #374543 - 08/19/01 01:05 PM (16 years, 4 months ago)

If you got much condesation, then your humidity gauge is not calibrated. You are most likely in the high 90es range.
Read http://www.omega.com/temperature/Z/pdf/z103.pdf and http://www.natmus.dk/cons/tp/satslt/satsol.htm

also

Checking Calibration:

Sensor calibration should be checked at 2 points. We use 33% and 75% at the factory. Never use 100% as a calibration point. One of our competitors suggests testing their calibration at 100% using saturated air. This is not accurate for the simple reason that most all humidity recorders limit the top reading to 100% If your instrument is reading 10% high, it will still look good at 100% due to the instrument's ceiling.
The only practical way to accurately check your RH calibration is to use known humidity standards. You can create your own standards using saturated salt solutions in a closed container. Different types of salt can be mixed with distilled water to form saturated solutions having a fixed RH at a given temperature. The following table shows the RH of various salts solutions at room temperature (68 F).

Lithium Chloride 11%
Magnesium Chloride 33%
Magnesium Nitrate 54%
Sodium Chloride 75%
Potassium Chloride 85%
(kitchen salt is Sodium Chloride)
Accurate results are possible with a little care. Please follow these guidelines:
a.) Use only pure water and salts. Do Not use common iodized salt for sodium chloride.
b.) The calibration must be done in an airtight container. If you're calibrating an RH-52 with an internal sensor you must make provisions to suspend the instrument above the solution. The sensor should be close to the solution, but avoid getting the solution on the sensor or instrument. Watch out for splashing if moving the container!
c.) The sealed, airtight container needs plenty of time to equilibrate. You should allow at least 8 hours, 24 is better. The key to faster equilibration is to have a small air volume and a large solution surface area. Some Tupperware containers work well, but be sure they're truly airtight.
d.) The RH values assume a constant temperature.

When making up the solution, slowly mix the distilled water and salt until a saturated solution is obtained. Make sure there's an excess of salt. Handle all these salts and solutions with care!


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OfflineMeanMark
newbie
Registered: 12/20/99
Posts: 22
Loc: western oz
Last seen: 16 years, 2 months
Re: humidity help [Re: Anno]
    #374545 - 08/19/01 01:12 PM (16 years, 4 months ago)

I thank you very much for your help. Not only am I going to figure the humidity correctly, but I think the purchase of a quality humidity gauge would help
Mean Mark

'cuse me while I kiss the sky....


--------------------
how high can you fly with broken wings......


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OfflineAnnoA
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Re: humidity help [Re: MeanMark]
    #374548 - 08/19/01 01:19 PM (16 years, 4 months ago)

Analog hygrometers with a calibration screw are sufficient and in many terms a better investment than digital ones.

Check this store, the under 10$ ones are your candidates.
Calibrate before use!
http://www.rnnenterprises.com/Cigar_store/Hygrometers/analog.htm

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Edited by Anno on 08/19/01 12:22 PM.



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