Agilent 990 Micro GC Natural Gas Analyzers - Data Sheet

Significance of the Topic

Natural gas trading relies on accurate measurement of energy content and composition. Rapid and reliable determination of hydrocarbon fractions, permanent gases, and impurities supports commercial valuation, process optimization, and safety in both laboratory and field settings.

Objectives and Study Overview

This document presents the Agilent 990 Micro GC Natural Gas Analyzers as turnkey solutions for compositional and calorific analysis. It describes available configurations, performance specifications, optional software for heat value calculations, and compatible accessories designed for robust and rapid natural gas testing.

Methodology and Instrumentation

The system is based on a miniaturized gas chromatograph with electronic carrier gas control, micro-machined injector, narrow-bore analytical columns, and micro-thermal conductivity detectors. Heated sample lines and injectors up to 110 °C prevent condensation. Independent column channels may include molecular sieve, PoraPLOT U, and CP-Sil 5CB phases. Backflush-to-vent options protect column performance by removing moisture, carbon dioxide, and heavy hydrocarbons.

Used Instrumentation

• Agilent 990 Micro GC cabinet (dual or extended channels)
• CP-Molsieve 5A column (10 m) with retention time stability filters
• PoraPLOT U column (10 m) with inert UltiMetal flowpath
• CP-Sil 5CB columns (4, 6, or 8 m)
• Micro-thermal conductivity detectors
• Heated injector and sample lines
• Optional Micro-Gasifier for LPG and LNG sample vaporization
• EZReporter software for calorific value and BTU calculations

Main Results and Discussion

Typical analysis times range from 75 to 400 seconds depending on hydrocarbon range (up to C12). Repeatability is better than 0.5% RSD for propane at 1 mol percent. Extended configurations add a third channel for heavier hydrocarbons or permanent gas separation. Calorific value calculations comply with GPA, ASTM, and ISO standards. Accessories such as filters, stream selector valves, and power supplies ensure flexible field and laboratory deployment.

Benefits and Practical Applications

• Complete factory-tuned solution including test data, methods, and manuals
• Optimized for field or lab use with rugged construction and easy startup
• No special operator skills required thanks to ready-to-go methods
• Fast chromatography delivers results in seconds, improving throughput and product valuation
• Modular design supports multiple natural gas compositions and target compounds

Future Trends and Potential Uses

Integration with digital platforms and remote monitoring will enhance real-time process control. Expansion of detector options and column chemistries may allow simultaneous analysis of additional contaminants. Advances in software will support automated data reporting, compliance tracking, and predictive maintenance.

Conclusion

The Agilent 990 Micro GC Natural Gas Analyzers offer a versatile, rapid, and precise approach to compositional and calorific analysis of natural gas streams. Their modular design, wide performance envelope, and optional software make them suitable for both laboratory and field applications, ensuring reliable data for commercial and quality control purposes.

References

1. Jie Zhang, Fast Analysis of Natural Gas using the Agilent 990 Micro GC Natural Gas Analyzer, Agilent Technologies Application Note 5994-1040EN, 2019.