<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2900.2802" name=GENERATOR> <STYLE>@font-face { font-family: Tahoma; } @page Section1 {size: 8.5in 11.0in; margin: 1.0in 1.25in 1.0in 1.25in; } P.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } LI.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } DIV.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } A:link { COLOR: blue; TEXT-DECORATION: underline } SPAN.MsoHyperlink { COLOR: blue; TEXT-DECORATION: underline } A:visited { COLOR: blue; TEXT-DECORATION: underline } SPAN.MsoHyperlinkFollowed { COLOR: blue; TEXT-DECORATION: underline } P { FONT-SIZE: 12pt; MARGIN-LEFT: 0in; MARGIN-RIGHT: 0in; FONT-FAMILY: = "Times New Roman" } SPAN.EmailStyle17 { COLOR: navy; FONT-FAMILY: Arial } DIV.Section1 { page: Section1 } </STYLE> </HEAD> <BODY lang=EN-US vLink=blue link=blue bgColor=#ffffff> <DIV><FONT face=Arial size=2>I certainly won't say that it won't = work, but I have my doubts it will provide enough accuracy. </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>If your shop is 50% RH at 70 degrees, = you will need to warm the hot box up to about 90 degrees or so to lower the RH to = around 30%. 90 degrees and 30.5% should give you an EMC of 6.0% (I find my hot box = is usually operating in that range). If you have a fluctuation of 2.5% RH = both ways, that would equate to a range of about 5.6% to 6.4% EMC. Yes, if = the on/off cycle was fairly short and the environment spent a similar time at both extremes, you should have a panel with an EMC pretty close to 6.0%. But = what if  90% of the time it is at 6.4% and only spends a small amount of = time in the lower ranges?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>However, if you can limit the = temperature of the hot box to within one degree F or so, hot box RH will vary less than 1% = up or down from target and potential MC extremes would be about 5.85% and = 6.15%. I haven't made a careful study of the performance of my thermostat, but = it sure seems to keep the hot box environment at a pretty darn consistent = temperature. Once I set it, I can check, check, check and it is always within a few = tenths of a degree. I think a good fan in the hot box is also important.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>The one thing that a humidistat has to = offer is complete hands-off environment control. With my thermostat, you do = have to manually monitor the hot box because the first day you put a panel in = the box the RH keeps rising as the wood looses moisture - so you need = to turn the temperature up. But then after the wood looses most of the moisture = it is going to loose, and the hot box has leaked (you do need a vent) it's = excess moisture, you need to turn the temperature down - otherwise you will = cook your soundboard! I just pop a panel in there when I have a shop day - it's = really not any trouble - but you do have to remember to check it!</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>So maybe it would be a good thing to = try that humidistat out. Record its performance and let us know. I'd sure be curious.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Terry Farrell</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV>----- Original Message ----- </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">I guess = they do that so that it isn’t clicking on and off constantly.  If you set it = for 30% I imagine it takes it down to 30% and then shuts off.  It doesn’t = turn on again until it hits 35%.  You could set it 2.5% below your target = which would have it fluctuating 2.5% above and 2.5% below and give you an = average RH over time of your target.  Since it takes a certain amount of = time for the wood to lose or gain moisture you would expect the range of the corresponding EMC to be somewhat less than 5% which would put it in an = acceptable range of your target, I would presume.  That’s, of = course, assuming that they are accurate.  </SPAN></FONT></DIV> <DIV class=Section1> <P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: = Arial"></SPAN></FONT> </P> <DIV> <P><FONT face="Times New Roman" color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy">David Love</SPAN></FONT><FONT = color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy"><BR>davidlovepianos@comcast.net = </SPAN></FONT></P></DIV> <P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Tahoma = size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">-----Original Message-----<BR></SPAN></FONT></P> <P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial = size=3><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">That web site states = "The differential between the on and off points is fixed at 5% RH", which = means the environment will vary 5%, depending on where it is in the on/off = cycle. A decent thermostat will keep the environment within a degree or so and = thus keeps the RH next to perfectly constant. </SPAN></FONT></P> <DIV> <P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times = New Roman" size=3><SPAN style="FONT-SIZE: = 12pt"></SPAN></FONT> </P></DIV> <DIV> <P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial = size=3><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">I had considered this = subject humidistat and others also. I'm glad I stuck with the simple = thermostat. It reall is easy to use and works very well.</SPAN></FONT></P></DIV> <DIV> <P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times = New Roman" size=3><SPAN style="FONT-SIZE: = 12pt"></SPAN></FONT> </P></DIV> <DIV> <P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial = size=3><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Terry Farrell</SPAN></FONT></P></DIV> <DIV> <P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times = New Roman" size=3><SPAN style="FONT-SIZE: = 12pt"></SPAN></FONT> </P></DIV> <DIV> <P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial = size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">----- Original Message = ----- </SPAN></FONT></P></DIV> <DIV> <P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial = size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">>> I found this = humidistat that I would use for a wood conditioning box <BR>>> that seems = to be fairly good but expensive ($290).  Anyone have any <BR>>> experience with it or can you suggest one that works as well for less <BR>>> $$$.  It’s the RHC that I’m looking at—scroll = down to the second unit. <BR>>> <BR>>> </SPAN></FONT><A href="http://www.greenair.com/humidistat.htm"><FONT face=Arial = size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: = Arial">http://www.greenair.com/humidistat.htm</SPAN></FONT></A><BR><FONT = face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: = Arial">>> <BR>>> David Love<BR>> <BR>> <BR>> If you're = conditioning wood for soundboard building, +-5%RH is <BR>> pretty miserable accuracy. = If you set it at 30%RH and 90°F looking <BR>> for 6%MC, you could get = anywhere from 5.2%-6.7%. Of course, if <BR>> that's just calibration = accuracy, and repeatability within a narrow <BR>> range is good (which they never = seem to think is important enough to <BR>> mention) you can offset the = reading and be pretty close. I assume <BR>> that's what the mentioned 5% "set differential" is for. So even a <BR>> cheap humidistat can work = well if it makes the same mistake with <BR>> dependable repeatability.<BR>> = <BR>> Ron = N</SPAN></FONT></P></DIV></DIV></BLOCKQUOTE></BODY></HTML>