New Test Method for Determination of Gaseous Hydrogen Impurities Using an Optical Feedback Cavity Enhanced Absorption Spectroscopy Analyzer (OFCEAS)
1. Scope
This test method provides a procedure on utilizing an Optical Feedback Cavity Enhanced Absorption Spectroscopy (OFCEAS) gas analysis system for determining trace impurities in gaseous hydrogen fuels relative to the hydrogen fuel quality limits specified in SAE TIR J2719 (April 2008), ISO 14687, or other applicable hydrogen fuel quality requirements issued by governing bodies similar to ISO 21087. This test method describes multi contaminant determination in fuel cell grade hydrogen as specified in relevant ASTM and ISO standards using Optical Feedback Cavity Enhanced Absorption Spectroscopy (OFCEAS). This standard test method is for the measurement of one or
Multiple contaminants including, but not limited to, water (H2O), oxygen (O2), methane (CH4), carbon dioxide (CO2), carbon monoxide (CO), ammonia (NH3), and formaldehyde HCHO, formic acid (HCOOH), carbonyl sulfide (COS), hydrogen chloride (HCL), and others.
Keywords
OFCEAS, impurities, gaseous fuels, hydrogen
Rationale
The OFCEAS method is intended to quantify gas-phase concentrations of multiple target contaminants in hydrogen fuel, either directly at the fueling station or from extracted samples analyzed at a laboratory as online, atline, offline. OFCEAS enables simultaneous detection of multiple impurities, provided they are in the gas phase and exhibit absorption features within the laser wavelength range used by the analyzer. Detection limits and specified target contaminants for this standard correspond to those defined in ISO 21087. OFCEAS technology provides simultaneous measurements of H2O, CH4, CO2, CO, HCHO, HCOOH, NH3, COS, HCL with uLOD calculated and found not exceeding 50% of the xLOD.
