<div dir="ltr"><a href="http://www.jondon.com/extech-rh390-thermo-hygrometer.html">http://www.jondon.com/extech-rh390-thermo-hygrometer.html</a><br><div><br></div><div style>That's a reasonable unit that we use with our desiccant dehumidifiers. If you need Grains Per Pound then the RH490 is the way to go. Just make sure you size it right with a professional otherwise you could start seeing cracking in the drywall/trim joints and any wood floors could also show issues.</div>
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<br><br><div class="gmail_quote">On Thu, Jun 6, 2013 at 10:14 PM, Bob klahn <span dir="ltr"><<a href="mailto:Home-NRG@dnaco.net" target="_blank">Home-NRG@dnaco.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
Eli,<br>
<br>
There is a company in Xenia, OH which has been specializing in
dessicants for 60 years. <br>
W.A. HAMMOND DRIERITE CO. LTD. P.O. Box 460 <b>Xenia</b>, <b>OH</b>
45385. Phone <a href="tel:%28937%29%20376-2927" value="+19373762927" target="_blank">(937) 376-2927</a> <br>
<br>
I'm sure there are more elegant methods of measuring dessicant
humidity but they make a paper card with humidity sensitive color
change patches, to tell when the dessicant is saturated and it is
time to dry it out for reuse.<br>
<br>
I'm sure that they could provide the technical information you are
looking for.<span class="HOEnZb"><font color="#888888"><br>
<br>
Bob Klahn</font></span><div><div class="h5"><br>
<b></b>
<div>On 6/6/2013 7:46 PM, conservation
architect wrote:<br>
</div>
<blockquote type="cite">I am interested in dabbling with desiccants this
summer to dehumidify in the house and dry externally with a heat
source. This is primarily a learning exercise more than proposing
a specific apparatus.
<br>
<br>
Can you recommend a device or method to to measure relative
humidity in the dessicant.
<br>
<br>
My plans are to purchase bentonite clay. ASHRAE says a desiccant
will absorb moisture until it meets the same relative humidity as
the ambient air. Therefore the quantity needed has to be
sufficient to absorb in the range of relative humidity I might
anticipate. If I am dehumidifying 75F, 80% RH to 75F, 50% RH, The
dessicant must be a lower RH, say 20% to increase to 50% relative
humidity. Of course the real amounts will depend on the relative
size of each. Those numbers would work if both desiccant and air
hold the same amount of moisture at saturation.
<br>
<br>
Eli
<br>
<br>
<br>
<br>
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