Re: Humidity sensor (fwd)

[Peter Kammel <kammel@one.npl.uiuc.edu>]

Dear Dave,

I tested the calculator and got exactly the result I expected:
ppmv @ x bar = ppmv @ 1bar /x. 
Example:
frostpoint (dewpoint) = -50 C, corresponds to 38.84 ppm @ 1 bar and
to 3.88 ppm @ 10 bar.

Thanks for the attached article, which is educational. 

I asked my colleagues at PSI about their measurements. They measured the
T dependence by slowly cooling the sensor and warming it up again. 
There was no hysteresis observable. Initially the noticed the different
readings, when the door of the experimental hall was opened and the
overall temperature changed. At constant temperature the sensor is very
stable.

We are waiting for your advice.

Thanks

Peter


On Mon, 27 Jun 2005 info@kahn.com wrote:

> Dear Peter:
> 
> Attached are the following documents:
> 
>     * An article providing practical suggestions on improving response
>       speed at low dewpoints
>     * A humidity calculator
> 
> I will call you tomorrow with comments regarding temperature effects on 
> the Pura sensor.
> 
> Sincerely yours,
> Dave Alan
> KAHN INSTRUMENTS, INC.
> 
> 
> Peter Kammel wrote:
> 
> >Dear Dave,
> >
> >That's the first report I got from our collaborators in Switzerland.
> >I will call you soon and ask for your advice.
> >
> >Best regards
> >
> >Peter
> >
> >Peter Kammel  /  pkammel@uiuc.edu
> >Department of Physics, Loomis Laboratory
> >University of Illinois at Urbana-Champaign
> >1110 West Green Street, Urbana, IL 61801 
> >Tel (217) 333-5424 / Fax (217) 333-1215   
> >
> >
> >---------- Forwarded message ----------
> >Date: Mon, 27 Jun 2005 17:11:40 +0200
> >From: Peter Kravtsov <pkravt@gmail.com>
> >To: Peter Kammel <kammel@npl.uiuc.edu>
> >Cc: Claude Petitjean <claude.petitjean@psi.ch>,
> >     Malte Hildebrandt <malte.hildebrandt@psi.ch>,
> >     Francoise Mulhauser <Francoise.Mulhauser@psi.ch>,
> >     Bernhard Lauss <lauss@berkeley.edu>
> >Subject: Humidity sensor
> >
> >Dear Peter and colleagues,
> >
> >Attached is our news and questions about the humidity sensor.
> >
> >  
> >
>