Problems with my "new" Dampp-Chaser Hygrometer

[Roger Wheelock]

Dear Mr. Luehrmann,

The hygrometer has an electronic sensor that is calibrated by the
manufacturer and cannot be recalibrated.  The challenge with the electronic
sensor is that it tends to drift over a period of 2 to 3 years.  The
advantage to this sensor is that it is relatively accurate, quite precise
and has a low cost.  The hygrometers that we use for our research testing at
the factory are in the $1000 to $1500 range.  Even these drift.  However,
they can be returned to the manufacturer for recalibration which we do on an
annual basis.

Sincerely,

Roger Wheelock, VP
Dampp-Chaser Corp.

----- Original Message -----
From: "N Luehrmann" <n_luehrmann@hotmail.com>
To: <pianotech@ptg.org>
Sent: Thursday, November 30, 2000 12:13 PM
Subject: Re: Problems with my "new" Dampp-Chaser Hygrometer


> UPDATE:
>
> Damp-Chaser sent me a new unit and seems to be working just fine.  Does
> anyone know if there is a way to calibrate these hyprometers?  I asked the
> rep at DC, but she didn't know if they could or could not be calibrated.
>
>
> Nils Luehrmann