TS ISO 7504

TS ISO 7504 is a vocabulary standard that brings together the terms and definitions used for calibration gas mixtures in gas analysis and gas measurements. Standards of this kind help different laboratories, production environments, and measurement systems use the same concepts with the same meaning, reducing ambiguity when calibration gases are prepared, identified, and reported.

Why calibration gas mixtures need dedicated terminology

A calibration gas is a gas mixture of known composition used to adjust, verify, or monitor the response of an analytical instrument. In gas analysis, terms such as sample gas, reference gas, check gas, and working gas may seem close, but they serve different technical purposes. This distinction matters for clear communication about concentration expression, purity, stability, and intended use. In general technical context, mixture homogeneity, component interactions, and storage conditions are key factors affecting measurement reliability.

Core concepts in gas analysis vocabulary

• Helps ensure terms are used consistently in measurement and calibration workflows.
• Provides a common language for gas mixture preparation, verification, and application.
• Reduces confusion in laboratory reports, instrument documentation, and technical communication.
• Supports equivalent understanding of shared concepts across different gas analysis methods.

The focus of this standard is the terminology associated with calibration gas mixtures used in gas analysis; in other words, it clarifies which expression corresponds to which concept. It standardizes the language of measurement rather than the measurement technique itself. This supports clearer, more comparable technical communication about reference and calibration gases in areas such as gas chromatography, environmental monitoring, process control, and related applications.