Dear Mr. Kammel: I am pleased to provide the following additional information in response to the questions raised in your e-mail dated Friday, May 6, 2005: 1. Given that hydrogen is potentially hazardous, the Pura I.S. is the only model we suggest for use in hydrogen. Please refer to Article 500 of the National Electrical Code for classification of hazardous locations. 2. We determined that 0.005 ppmV is equal to -92.97C dew point at 10 barg. The PURA and PURA IS (the only model that we can suggest for hydrogen) have the same +/-2C accuracy and 1C resolution in the range from -60 to -100C dew point. If we assume a worst-case combined accuracy and resolution of +/-3C, then -95.23 @ 10 bag = 0.003 ppmV and -89.23 @ 10 barg = 0.008 ppmV. As such we can achieve a measurement at 0.005 ppmV to +0.003/-0.002. We can therefore conclude that PURA will measure at 5ppbV to a sensitivity better than 5ppbV, in fact sensitivity is encompassed in resolution which equates to better than 1ppbV under these conditions. 3. The attached Excel graphs show typical response of PURA at trace moisture levels. 4. There is no educational discount available for this product. Sincerely yours, Robert T. Bailey Product Manager KAHN INSTRUMENTS, INC. Peter Kammel wrote: > Dear Robert, > > Could you please send us a new quotation, to update HGQ 9846. > > Our requirements are: > > - 5 ppbv sensitivity to H2O in pure hydrogen gas at 10 bar. > Which sensitivity in ppb can we expect in a 10 bar hydrogen gas > stream? At -100 C the vapor pressure of ice is 20e-9 bar, or > 2E-9 of the 10bar H2 gas. Thus we should get a sensitivity of > some ppbv. Can you confim this estimate. > > - Is hydrogen considered a non-hazardous gas, compatible with the > Pura transmitter? > > - Could you email me a manual for the Pura Premium Dewpoint Transmitter. > > - Is there an educational discount on this product? > > Thank you. > > Peter > > Prof. 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, 25 Oct 2004 16:07:59 -0500 (CDT) > From: Peter Kammel <kammel@npl.uiuc.edu> > To: Robert T.Bailey <hygros@kahn.com> > Subject: Fwd: PURA Transmitter/Kahn Instruments Quotation Number HGQ 9846 > (fwd) > > Dear Robert, > > Thank you for the quotation. > > Let me explain our application a bit more: > > We are performing an experiment with ultrapure hyrogen > (impurities and deuterium depleted). Please have a look at > http://www.npl.uiuc.edu/exp/mucapture/ > > About 1000 atmospheric liters of hydrogen are continuously circulated > at 10 bar pressure with a flow of about 1.5 l/min (see link to > CRDF in the news). Although the purification system should is very > efficient (as demonstrated by N2 chromatography), we would like to > directly verify the outgasing in our experimental chamber. Ideally, that > would be done in a flow through devide installed in the circulation > system. > > Now let me ask you a few questions: > > i) Could you email me a manual for the Pura Premium Dewpoint Transmitter. > > ii) How is the cooling to -120 C achieved? Do we need liquid nytrogen? > > iii) Which sensitivity in ppb can we expect in a 10 bar hydrogen gas > stream? At -100 C the vapor pressure of ice is 20e-9 bar, or > 2E-9 of the 10bar H2 gas. Thus we should get a sensitivity of > some ppbv. Can you confim this estimate. > > iv) Is there any chance for a quick delivery (say within a week) of > a Pura Dewpoint Transmitter? Or could we rent such a device for > a month? > > v) Is there an educational discount on this product? > > Thanks and best regards > > Peter > > Prof. 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 > > >Organization: The Kahn Company > >X-Mailer: GoldMine [5.50.10424] > > > >Ladies & Gentlemen: > > > >In response to your request for quotation, we are transmitting our > >attached proposal. This quotation provides technical information as well > >as detailed pricing. The literature for this unit is available in Adobe > >PDF format on our website at http://www.kahn.com/info/pura.pdf. More > >general literature on our broad line of hygrometers is available at > >http://www.kahn.com/PDF/Hygros.pdf. To read more about The Kahn Companies, > >visit our website at http://www.kahn.com. > > > >If Adobe Reader is not yet installed on your computer, you may use the > >following link to download it. > >http://www.adobe.com/products/acrobat/readermain.html. > > > >If after reviewing this information you have any further questions, please > >feel free to contact me. > > > >Sincerely yours, > >Robert T. Bailey > >Product Manager > >KAHN INSTRUMENTS, INC. > >
Attachment:
Pura typical response data1.xls
Description: application/msexcel