Where did the RH Go

Sarah Fox sarah@gendernet.org
Wed, 14 Jan 2004 19:37:09 -0500


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Hi Terry,

I use a Kenmore model 42.14125 unit, which has its own internal =
humidistat (so current draw is not a limitation).  The total draw of the =
system is quite low, at 37W (0.33A), so it could be plugged into a DC =
humidistat -- or the GE humidistat I use.  The default humidity setpoint =
is something like 60%RH, so it would cycle on and off satisfactorily =
with the under-piano humidistat.  There are much cheaper ultrasonic =
units that don't have humidistats.  These would be even better suited =
for being switched on and off by the under-piano humidistat -- at the =
end of a very long extension cord, of course!  :-)

Peace,
Sarah

  ----- Original Message -----=20
  From: Farrell=20
  To: Pianotech=20
  Sent: Wednesday, January 14, 2004 7:01 PM
  Subject: Re: Where did the RH Go


  What type of room humidifier are you using? How many watts does it =
use? I think the H2 humidistats are rated up to 600 watts. I have ran a =
Sears basement-type dehumidifier off a humidistat in the past. That =
would solve your troubles for when you travel.

  Terry Farrell
    ----- Original Message -----=20
    From: Andrew & Rebeca Anderson=20
    To: Pianotech=20
    Sent: Wednesday, January 14, 2004 10:34 AM
    Subject: Re: Where did the RH Go


    My wife and I regulate humidity (in winter) through the whole house =
with two humidifiers and a gauge on a bookshelf by the piano.  This =
requires some attentiveness, and is affected by outdoor weather.  The =
problem comes when we travel.  We were away over the holidays for two =
weeks and when we returned the humidity was in the high single digits.  =
The piano sounded horrible.  We got humidity up in a few days and in two =
weeks I retuned.  We have developed a rather low-tolerance for =
out-of-tune. =20
    The issue is practicality.  Most customers will not go through the =
trouble of monitering RH and refilling, turning on/off their humidifiers =
on a daily basis.  Once a piano is up to humidity, the DC will usually =
last a week often more, it only has a small environment to keep-up.  The =
humidity migrates through the wood, even in a grand piano pin torque is =
affected (closed lids do help in extreme environments).  Buying a room =
humidifier that has a remote-control humidistat will cost more than a DC =
system, although it would benefit all the wooden furniture too.  I have =
discussed this with clients and some have chosen to get a cheap =
hardware-store hygrometer and start running a room humidifier.  They =
last about halfway to the next tuning and then want a DC system or =
believe they can tolerate the effects on the piano.

    Andrew Anderson
    Las Cruces, NM

    At 06:40 AM 1/13/2004 -0500, you wrote:

      I don't think anyone is questioning the effects of RH changes on =
the tuning of a piano.
      =20
      I'm with Sarah and feel that proper full environment humidity =
control is the best way to go - better than a full DC installation.
      =20
      I think where the arguement comes in is the fact that probably 99% =
of full environment humidity control systems are improperly designed, =
poorly functioning, turned off and windows opened up, turned off over =
the holidays and summer, etc., etc.=20
      =20
      But this does not change the fact that if one installs a proper =
full environment humidity control system that holds the RH constant =
within a few percent, it will be more effective than a full DC.
      =20
      And don't forget that even if you hard-wire the DC system into the =
wall, who is ever going to notice that the circuit breaker tripped 15 =
months ago and the piano hasn't had any humidity control since that =
time?
      =20
      In my shop I have a Sears basement-type dehumidifier. It keeps the =
shop right at 45% RH (within a percent or two). I never varies. How in =
the world is a DC unit on a piano in my shop going to work better, or do =
anything at all besides vapor, dry, vapor, dry, vapor, dry, etc., etc.?
      =20
      So I guess the bottom line is that if one is willing to set up a =
proper full environment humidity control system that holds the RH =
constant within a few percent, that is the best way to go. From a =
practical standpoint, knowing that 90-some% of full environment humidity =
control systems are not going to be real effective, the full DC-type =
system is the way to go (they DO work quite well). And as someone =
pointed out, from a practical standpoint a full DC-type system in a =
piano which is in an environment modified by a full environment humidity =
control systems is the best around.=20
      =20
      Flame Suite Tighly Zipped,
      =20
      Terry Farrell
      =20
      ----- Original Message -----=20
      From: "DIANE HOFSTETTER" <dianepianotuner@msn.com>
      To: <pianotech@ptg.org>
      Sent: Tuesday, January 13, 2004 2:51 AM
      Subject: Re: Where did the RH Go

      > Sarah,
      >=20
      > For fourteen years now my partner and I have been measuring and =
graphing the=20
      > tuning on every piano immediately before we tune it.   We also =
record the=20
      > relative humidity and temperature most of the time, whether it =
has a=20
      > Damppchaser installation or not, and if it is functioning =
correctly.
      >=20
      > Then when we next tune the piano and record all the data again, =
we have a=20
      > way of understanding how to service the piano to make the tuning =
as stable=20
      > as possible.
      >=20
      > Over the years I have had fun with a variety of experiments.  =
One day I=20
      > arrived to tune a piano in a room that is routinely kept =
unheated with no=20
      > climate control in the piano.  The maintenance people had just =
turned on the=20
      > heat before I arrived and a stream of warm area was shooting out =
of the=20
      > register about ten feet away.
      >=20
      > I was dismayed; the heat should have been turned on hours =
before.  I knew=20
      > the tuning could not be reliable.  I went ahead and graphed the =
tuning.  As=20
      > soon as I finished that graph, I remeasured the tuning and =
graphed it again.=20
      >   Then I remeasured and regraphed, and then once again.  I ended =
up with a=20
      > graph showing four distinctly separate lines of the tuning as it =
changed=20
      > with the relative humidity and temperature for each line =
carefully recorded.
      >=20
      > There is no question in my mind that changes in relative =
humidity affect the=20
      > tuning dramatically and that a Damppchaser system does an =
excellent job of=20
      > helping control that.  I have numerous graphs to show it does.
      >=20
      > Diane
      >=20
      >=20
      >=20
      >=20
      >=20
      > Diane Hofstetter
      >=20
      >=20
      >=20
      >=20
      >=20
      > >From: "Sarah Fox" <sarah@gendernet.org>
      > >Reply-To: Pianotech <pianotech@ptg.org>
      > >To: "Pianotech" <pianotech@ptg.org>
      > >Subject: Re: Where did the RH Go
      > >Date: Mon, 12 Jan 2004 21:48:30 -0500
      > >
      > >Hi Don,
      > >
      > > > I did not say your system didn't work. What I said was a DC =
system would
      > > > work even better.
      > >
      > >Perhaps.  Perhaps not.  I don't mean to be argumentative on =
this point. =20
      > >I'm
      > >really asking a question here:  Have you (or has anyone else) =
done
      > >measurements with a good, accurate hygrometer on a complete DC =
grand
      > >installation, during dry ambient conditions, showing that =
humidity is=20
      > >indeed
      > >evenly distributed all over the soundboard, both under and on =
top, and in
      > >the action cavity?  Also, have the same measurements been done =
inside the
      > >piano with a closed lid and inside the action cavity during =
predominantly
      > >dehumidifying periods?  In other words, are DC's claims fully=20
      > >substantiated,
      > >as determined empirically with a hygrometer?  I've heard lots =
of claims
      > >regarding stability of pitch.  That's all well and good, of =
course.
      > >However, how well does the DC system regulate humidity (in =
contrast to
      > >pitch)?
      > >
      > > > I do recommend room type humdifiers as well--but only to =
"assist" a DC
      > > > unit. If it is a choice of one or the other the DC provides =
much better
      > > > year round control than is generally possible with a room =
type. There=20
      > >are
      > > > exceptions, but they are very rare.
      > >
      > >This sounds like a reasonable approach.
      > >
      > > > Do you have measurements for the summer time? Where I am I =
have=20
      > >documented
      > > > as low as 4% and as high as 84%.
      > >
      > >Without humidification, humidity levels inside my house vary =
from 27% in=20
      > >the
      > >winter to 67% in the late fall.  I have forced heat and =
refrigerated A/C,
      > >BTW.  I suspect humidity levels are far different in other =
parts of the
      > >state.  I'm in Central Ohio.  In the lake areas, humidity is =
undoubtedly
      > >much higher during moderate weather.  Also, I have no idea what =
humidity
      > >levels occur in other people's homes here in Columbus.  (I =
don't service
      > >their pianos. <grin>)
      > >
      > > > I would love to have a controller for a DC type system that =
had much
      > > > narrower limits. I know, for example, that rare bird =
hatcheries have=20
      > >units
      > > > that are calibrated to 1/10 of one percent humidity that =
power an
      > > > "electronic" fan (read no blades--some sort of vibrating =
plate) combined
      > > > with an ultrasonic humidifer. I'd love to get my pinkies on =
one!
      > >
      > >Well, I can't boast 0.1% limits with my system (WOW!!), but I =
do quite a=20
      > >bit
      > >better than the specs DC boasts.  I did a 100% non-DC-brand =
installation on
      > >my concert grand, using a GE humidistat that cycles the system =
adjustably
      > >between 40 - 44% (or occasionally as widely as 39 - 45%) when =
the ambient=20
      > >RH
      > >is in the upper 40's.  The installation is fairly recent, so I =
haven't yet
      > >been able to observe its behavior at higher humidity levels.  =
I'll give you
      > >an update in the spring if you're interested.
      > >
      > >Peace,
      > >Sarah
      > >
      > >
      > >
      > >
      > >_______________________________________________
      > >pianotech list info: =
https://www.moypiano.com/resources/#archives
      >=20
      > =
_________________________________________________________________
      > Scope out the new MSN Plus Internet Software - optimizes dial-up =
to the max!=20
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      > _______________________________________________
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https://www.moypiano.com/resources/#archives
      > 
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