ASTM D7941/D7941M-23
Standard Test Method for Hydrogen Purity Analysis Using a Continuous Wave Cavity Ring-Down Spectroscopy Analyzer

Standard No.

ASTM D7941/D7941M-23

Release Date

2023

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D7941/D7941M-23

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.

ASTM D7941/D7941M-23 Referenced Document

• ASTM D4150 Standard Terminology Relating to Gaseous Fuels*， 2023-07-01 Update
• ASTM D5287 Standard Practice for Automatic Sampling of Gaseous Fuels
• ASTM D7265 Standard Specification for Hydrogen Thermophysical Property Tables (Standard + Redline PDF Bundle)
• ASTM D7606 Standard Practice for Sampling of High Pressure Hydrogen and Related Fuel Cell Feed Gases*， 2024-04-21 Update
• ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• ISO 21087 Gas analysis — Analytical methods for hydrogen fuel — Proton exchange membrane (PEM) fuel cell applications for road vehicles
• SAE J2719-2020 Information Report on the Development of a Hydrogen Quality Guideline for Fuel Cell Vehicles

ASTM D7941/D7941M-23 history

• 2023 ASTM D7941/D7941M-23 Standard Test Method for Hydrogen Purity Analysis Using a Continuous Wave Cavity Ring-Down Spectroscopy Analyzer
• 2014 ASTM D7941/D7941M-14 Standard Test Method for Hydrogen Purity Analysis Using a Continuous Wave Cavity Ring-Down Spectroscopy Analyzer