Re: CR-1A hygrometer (fwd)

[Bernhard Lauss <lauss@berkeley.edu>]

This is the one I wanted.

The 2 you gave me the address have the disadvatage of a
a low end measurement point which is quite higher.

However, does not look good to be obtained before run end.


		Bernhard


*******************************************************************
Bernhard Lauss                 E-Mail: lauss@socrates.berkeley.edu
Physics Department
366 LeConte Hall
University of California @ Berkeley
Berkeley, CA 94720                             Tel: (510)-642 4057
United States                                  Fax: (510)-642 9811
*******************************************************************

---------- Forwarded message ----------
Date: Mon, 15 May 2006 11:50:30 -0600
From: John Buetow <john@hygrometers.com>
To: Bernhard Lauss <lauss@berkeley.edu>
Subject: Re: CR-1A hygrometer

Dear Dr. Lauss,

5-30 ppb should be fine for the CR-1A.  150 psia is on the high end, but
it is still within the max pressure specification. Flow rate should be
no more than 3 l/min. Less than that would be better, as the higher flow
will cause turbulence and also increase the heat load on the mirror,
which will shorten the time that the LN2 will last. However, since you
are measuring at such a low dew point, this is less of an issue than if
you were measuring above 1 ppmv. Still, hydrogen has 4 times the thermal
conductivity of air, and so will impact LN2 boil-off. I would recommend
about 0.5 l/min or less for hydrogen to maximize the time required
between LN2 fill ups.. This may or may not be an issue depending upon
your measurement schedule.

Pricing on the CR-1A is $17,500. There is a battery option that adds
$500. You should be able to get close to 8 hours of operation before
refilling LN2 with the new 0.6L dewar we are now using. Delivery is an
unknown at this point. I may be able to get you a demo unit within the
next month. However, I will have to check with my dewar manufacturer to
get the latest delivery time from them. Normally we quote 12 weeks for
delivery on a CR-1A. If that works for you, then no problem. But, if you
need something sooner than that, I will have to see what can be done.

I currently am attending a conference and will be out of the office
until Thursday. I can be reached by e-mail, or you can leave me
voicemail and I can try back during a break.

Best regards,

John

-- 
John Buetow
President and CEO
Buck Research Instruments, LLC


Bernhard Lauss wrote:

>Hi,
>
>We have strong interest in your CR-1A Cryogenic Hygrometer.
>Please contact me via Email or at my below given phone.
>
>We want to run in in a pure hydrogen gas at 150 PSI pressure
>and want to measure moisture at approximately 5 - 30 ppb level.
>
>Can we do this with your device ?
>
>What flow rate can one use for your device. (e.g is 3 l/min too high)
>
>What is the current lead-time.
>
>We would need very shortly.
>
>Can you please send a quote to my Email address.
>
>
>		thanks a lot
>
>
>			Bernhard Lauss
>
>
>
>
>
>*******************************************************************
>Bernhard Lauss                 E-Mail: lauss@socrates.berkeley.edu
>Physics Department
>366 LeConte Hall
>University of California @ Berkeley
>Berkeley, CA 94720                             Tel: (510)-642 4057
>United States                                  Fax: (510)-642 9811
>*******************************************************************
>
>
>
>