Informative User Contributions

Floppy Disk

On this page, you will find documents, photographs, and other materials provided by some of our users, illustrating unique applications in the field.  Most of these document files are in Adobe .pdf file format, due to their size, and may be printed locally after download.  You must have the free Acrobat Reader or Adobe Acrobat installed on your computer to read these document file.  If you do not have the Acrobat Reader or Adobe Acrobat on your computer, you may download it for free by clicking on this link:

Get Acrobat Reader

Click on any of the links below to download the .pdf file for the document or application note.

Brief documents or e-mails appear on this page directly as text.

All photographs are in .jpg or.gif format.  By clicking on the image, you may view the full-size version of the image.  Then by right clicking with your mouse on the image, a window will open, allowing you to download the image to your computer's hard or floppy drive.

This page is currently under construction, so please check back soon for new material.


Submitted by Bob Richardson, of Pacific Rim Design and Development, Inc., Shingletown, California:

Floppy Disk   "The Best of Both Worlds: An analytical chemistry adventure story with a happy ending . . . a time and place where everyone wins. "
    441,017 bytes

Submitted by Paul Patterson, DETector Engineering & Technology, Inc., Walnut Creek, California:

Floppy Disk   "DET Portfolio of Unique Chemical Detection Applications, featuring the principles of Thermionic Surface Ionization and Flame Ionization"
   2,825,855 bytes


From an e-mail from Philip Bennett, University of Texas at Austin, a long-time customer:

"Here are a couple of photos of one of your GCs in a cave in Wyoming we thought you might get a laugh about.

The cave has a sulfidic/radon atmosphere, so we are wearing masks at all times, and the computer is covered with saran wrap to protect it from the sulfuric acid drops off the roof.  The inlet system is a teflon injection valve we mounted on the front, plumbed into continuous flow teflon flux chambers.  Hydrogen is from a small aluminum cylinder, power is from a generator at the cave entrance, with ~200m of extension cord - we were never able to get the system working right with batteries and inverter.  We originally had the GC at the car, but the samples would degrade before we could analyze them, so we moved everything into the cave.  With the MXT-1 60m column we are able to get <1ppm organic sulfur gases, but with very high H2S and low COS and MeS we switched to the Restek XL-Sulfur column for the better H2S-COS separation.

Other than the first time, when we brought the GC into a 21 C 100% RH cave environment straight from a -10 C, 10% RH outdoor environment, and fried all of the output transistors with condensed water, the GC has worked 100% of the time, and we have to-date made ~750 underground gas analyses.


Phil Bennett

Philip Bennett
Dept. of Geological Sciences
The University of Texas at Austin
Austin, TX  78712
Voice:  512-471-3587
FAX:    512-471-9425
Click on any image to see the full-sized image.

Philip's activities in this cave system were featured in an Oct. 2002 episode of PBS' Nova series.

Click here for a transcript of that episode

If you would like to submit any material for this page, contact Doug Gavilanes by e-mail at doug@srigc.com

If you have any questions regarding the information available on this page, please feel free to e-mail us: SRI Customer Service or call us at (310) 214-5092 Monday - Friday, 8AM - 5PM California time