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  • ASTM
    D7941/D7941M-23 Standard Test Method for Hydrogen Purity Analysis Using a Continuous Wave Cavity Ring-Down Spectroscopy Analyzer
    Edition: 2023
    $86.11
    Unlimited Users per year

Description of ASTM-D7941/D7941M 2023

ASTM D7941/D7941M-23

Active Standard: Standard Test Method for Hydrogen Purity Analysis Using a Continuous Wave Cavity Ring-Down Spectroscopy Analyzer




ASTM D7941/D7941M

Scope

1.1 This test method describes contaminant determination in fuel cell grade hydrogen as specified in relevant ASTM and ISO standards using cavity ring-down spectroscopy (CRDS). 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 (H2CO), henceforth referred to as “analyte.”

1.2 This test method applies to CRDS analyzers with one or multiple sensor modules (see 6.2 for definition). This test method describes sampling apparatus design, operating procedures, and quality control procedures required to obtain the stated levels of precision and accuracy.

1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


Keywords

absorption; absorption spectroscopy; Beer-Lambert law; infrared absorption; infrared analysis; infrared (IR) absorption; laser; laser-based spectroscopy; near-infrared; NIR; PEM fuel cell; optical technique; tunable diode laser; quantum cascade laser; cavity-enhanced spectroscopy; cavity ring-down spectroscopy; vehicle fuel;


ICS Code

ICS Number Code 27.075 (Hydrogen technologies)


DOI: 10.1520/D7941_D7941M-23

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