Full System Damp-Chasers

[Roger Wheelock]

Hello All,

Based on research in our test room at the factory we see the following.
Here the room is held as close to 70% RH as possible for the duration of the
testing.  When a complete system is used in a grand we can see the moisture
content across the soundboard stabilized with less than a 1/2 of 1%
equilibrium moisture content differential.  This differential is about 3/4
of 1% with dehumidifiers and a humidistat only.  We have attributed this to
the high repeatability of the cycle with the full system.

Does this make a difference in the field?  Our test room has a very stable
environment in terms of air movement.  In more normal environments, the
above differences are likely not significant.

We are initiating a number of pitch stability tests and will be
investigating this and other phenomenon using a Cybertuner over the next ten
months.  Perhaps something more dramatic will come from this testing.  If so
we will present the data at Kansas City next summer.

Thanks,

Roger

----- Original Message ----- 
From: "Corte Swearingen" <cswearingen@daigger.com>
To: "Pianotech" <pianotech@ptg.org>
Sent: Monday, September 20, 2004 12:13 PM
Subject: Re: Full System Damp-Chasers


>
>
>
>
> Hi Everyone,
>
> I'm certainly not an expert in Dampp Chaser systems, having only installed
> half a dozen, but it seems to me that there is still benefit in installing
> a complete system here, even with extreme humidity conditions.
>
> It seems to me that this is not a precise system and the de-humidifier and
> humidifier bars will overshoot matters quite a bit.  If you just install a
> heater bar with no humidity portion to work against it, aren't you in
> danger of having the piano interior too dry?  I think there may be a
> benefit of always installing a full system so the two systems (humidifying
> and de-humidifying) can interact with each other and better compensate for
> overshoot in either direction.
>
> What does Dampp Chaser have to say about this?
>
> Corte Swearingen
> Chicago
>
>
>
>                       "Joe Garrett"
>                       <joegarrett@earth        To:       "pianotech"
<pianotech@ptg.org>
>                       link.net>                cc:
>                       Sent by:                 Subject:  Full System
Damp-Chasers
>                       pianotech-bounces
>                       @ptg.org
>
>
>                       09/20/2004 10:40
>                       AM
>                       Please respond to
>                       Pianotech
>
>
>
>
>
>
> Sheesh! If the relative humidity NEVER goes below 42%, then why in hell
> would you install a full system. The Humidification unit will simply make
> the De-humidifier work more! Even tho the Humidity unit Never turns on,
the
> damned thing is evaporating 24-7! To install the Humidity unit is of
> absolutely no use to the customer and simply a way of extracting more
money
> from said client, IMO!
> Joe Garrett, R.P.T.
> Captain, Tool Police
> Squares R I
>
>
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>