PLIS Update VII, Mar 31, 2003
Major developments have come about since the last update. These developments are in the areas of heated versions of PLIS, pricing and configuration, new applications and pressure testing. Most of this data will be presented in a poster session and Plenary presentation at the May 18-22/03 ISCC conference in Las Vegas.
1.Heated STEM (HSTEM/HPLIS): Much progress has been made in this area with very positive and exciting results. This has motivated us to coin the new acronyms HSTEM for heated STEM and HPLIS for High Performance PLIS and commit to deliveries by June 15/03. The following sections list the new options and configurations to the pricing and configuration guide; selected chromatograms illustrating performance with high boilers and high polarity analytes along with critical parameters.
2. Pricing and Configuration Guide: The following addition has been made to the last pricing and configuration guide. This addition has to do with ordering the HSTEM accessory for field upgrade of an existing PLIS to HPLIS on Agilent/HP 5890/6890/50 gc's.
3. HSTEM/HPLIS Applications: Many difficult applications have been tested and optimized using the prototype HSTEM system. Difficult to chromatograph samples that are very polar, high in carbon number or high in boiling point were selected to evaluate the effectiveness of HPLIS. This data will be presented in detail in a plenary paper and a poster session at the May 18 - 22/03 ISCC conference in Las Vagas.
Some analytes selected for this evaluation included:
|Alcohols ||ASTM D-2887 Cal Std|
|Light condensates ||T200 Bottoms|
|Heavy condensates ||TBC in Butadienne |
Sample chromatograms of some of the above can be viewed in the "Applications" Section.
4. PLIS Version 2 Pressure Testing: Because of HSTEM, there is a possibility that pressures in the sample chamber could rise above the specified 1200 psi due to heat conducted by the retracting STEM. To ensure safety of personnel, PLIS has been subjected to hydrostatic pressure testing exceeding 6000 psi (5 x operational specification) on the sample chamber and 500 psi (>5 x recommended operational pressure) on the pneumatic cylinder. Pressure graphs are posted in the "Specifications" tab.