| Abstrakt: |
Progress is reported on the development and commercialization of HEMS, a novel technology for the measurement of key trace concentrations of contaminants in Hydrogen as identified in SAE-J2719 and ISO 14687, at point of use at Hydrogen fueling station. This is the only commercial technology to validate real time the compliance with SAE / ISO standards. The core of the technology are pre-concentrators, developed by Power & Energy, Inc. which selectively eliminate hydrogen, while retaining and concentrating the impurities. The concentration of the impurities can be increased more than 5,000- 20,000 fold, thus simplifying and enhancing their analysis. The HEMS device uses proprietary GC-TCD analyzers. The HEMS device generates its own pure H2 as GC pushing fluid from the same Hydrogen sample prepared for analysis. Thus HEMS is totally self-contained. The system has demonstrated 5 ppb level detection of H2S, COS and CS2, <30 ppb NH3, ~50 ppb CO, ppm detection of CO2, O2, H2O, and CH4, We will report results on the analytical figures of merit, including linearity, precision, accuracy for the analytes listed in the SAE-J2719 standard. HEMS is designed to be operated at Hydrogen Fueling Stations in continuous sampling mode. The analyte sample can be introduced at about 100 PSIA, sample required is about 1 liter, and analysis time is about 15 minutes. |
