Humidistat for Wood conditioning box

[David Love]

This is a multi-part message in MIME format.

---------------------- multipart/alternative attachment
I guess they do that so that it isn=92t 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=92t 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=92s, of course,
assuming that they are accurate. =20

=20

David Love
davidlovepianos@comcast.net=20

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On =
Behalf
Of Farrell
Sent: Monday, January 23, 2006 4:05 PM
To: Pianotech List
Subject: Re: Humidistat for Wood conditioning box

=20

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.=20

=20

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.

=20

Terry Farrell

=20

----- Original Message -----=20

=20

>> I found this humidistat that I would use for a wood conditioning box=20
>> that seems to be fairly good but expensive ($290).  Anyone have any=20
>> experience with it or can you suggest one that works as well for less =

>> $$$.  It=92s the RHC that I=92m looking at=97scroll down to the =
second unit.=20
>>=20
>>  <http://www.greenair.com/humidistat.htm>
http://www.greenair.com/humidistat.htm
>>=20
>> David Love
>=20
>=20
> If you're conditioning wood for soundboard building, +-5%RH is=20
> pretty miserable accuracy. If you set it at 30%RH and 90=B0F looking=20
> for 6%MC, you could get anywhere from 5.2%-6.7%. Of course, if=20
> that's just calibration accuracy, and repeatability within a narrow=20
> range is good (which they never seem to think is important enough to=20
> mention) you can offset the reading and be pretty close. I assume=20
> that's what the mentioned 5% "set differential" is for. So even a=20
> cheap humidistat can work well if it makes the same mistake with=20
> dependable repeatability.
>=20
> Ron N


---------------------- multipart/alternative attachment
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/26/24/5a/97/attachment.htm

---------------------- multipart/alternative attachment--