GB/T 3634.2-2025 High-Purity Hydrogen Testing Solutions and Instrument Configuration Recommendations

As GB/ T 3 The promulgation and implementation of GB/T 634.2-2025, “Hydrogen—Part 2: Pure Hydrogen, High-Purity Hydrogen, and Ultra‑Pure Hydrogen,” have further raised the quality‑control requirements for these grades of hydrogen. The revised standard not only focuses on hydrogen purity but also places greater emphasis on the accurate determination of critical impurities, including oxygen, nitrogen, carbon monoxide, carbon dioxide, total hydrocarbons, water, and hydrogen sulfide.

For high-purity hydrogen producers, gas companies, third-party testing laboratories, users of electronic-grade gases, and enterprises across the hydrogen energy value chain, establishing a high-purity hydrogen testing system that complies with the new national standards—featuring sufficiently low detection limits, stable repeatability, and reliable operation—has become a key challenge following the implementation of these standards.

Liaoning Kerui Chromatography Technology Co., Ltd. combines GB/ T 3 634.2-2025’s requirements for high-purity hydrogen testing projects, introducing a method based on… KR-LGS 2032 The high-purity hydrogen detection solution for gas chromatography platforms can analyze a wide range of trace impurities in high-purity hydrogen, providing valuable guidance for enterprise quality control, outgoing inspection, incoming sample testing, and laboratory capacity building.

I. GB/ T 3 634.2-2025: What requirements does it impose for the testing of high-purity hydrogen?

GB/ T 3 634.2-2025 specifies the key impurity parameters for pure hydrogen, high-purity hydrogen, and ultrapure hydrogen. For the analysis of high-purity and ultrapure hydrogen, companies typically need to focus on the following parameters:

Test Items	Reason for Following
Oxygen O₂	It affects hydrogen purity and the safety of certain processes.
Argon Ar	One of the common inert impurities in high-purity and ultrapure hydrogen.
Nitrogen N₂	Air leakage and insufficient system purging can easily lead to the introduction of…
Carbon monoxide CO	It has a significant impact on fuel cells, catalysts, and certain processes.
Carbon dioxide Carbon dioxide	Reflects the level of impurity control during hydrogen production, purification, or filling processes.
Total hydrocarbons (Expressed as methane)	Assessment of hydrocarbon contamination and residual organic impurities
Hydrogen sulfide H₂S	It has a significant impact on catalysts, fuel cells, and high-end gas‑use applications.
Moisture H₂O	One of the most critical and common control parameters in high-purity gases.

Among these, oxygen, argon, nitrogen, carbon monoxide, carbon dioxide, total hydrocarbons, and moisture are directly involved in impurity control and purity assessment. The new version of the standard also provides clearer guidance on testing methods, sampling requirements, and safety considerations, which means that testing systems must not only… “Being able to measure” also requires that the measurements be accurate, stable, and low‑noise.

II. Comprehensive Solution for High-Purity Hydrogen Detection by Liaoning Kerui Chromatography

Targeting GB/ T 3 For the analytical requirements of 634.2‑2025, Liaoning Kerui Chromatography Technology Co., Ltd. recommends adopting a configuration strategy that incorporates “multiple detectors, multiple valves and columns, and project‑specific optimization.”

Depending on the nature and concentration levels of various impurities, high-purity hydrogen analysis can be classified into As follows Analysis Plan:

Plan	Test subject	Recommended Configuration	Scheme Features
Instrument One	O₂+Ar, N₂, CO, CO₂	KR-LGS 2032L host + PDHID detector + 3-valve, 4-column system	Suitable for high-sensitivity trace inorganic impurity analysis.
Instrument Two	H₂S, total hydrocarbons (expressed as methane)	KR-LGS 2032L host + FPD detector + FID detector + 4-valve, 3-column system	Suitable for the analysis of sulfide and hydrocarbon impurities.

This plan is based on KR-LGS 2032 Using a gas chromatograph as the platform, key impurities in high-purity hydrogen are separated and detected by configuring various valve manifolds, chromatographic columns, and detectors.

III. Liaoning Kerui Introduction to the KR-LGS 2032 Series Gas Chromatography Analysis Platform

In In the GB/T 3634.2-2025 standard for high-purity hydrogen analysis, the stability of the instrument platform, the detector’s configuration capabilities, the expandability of the valve‑column system, and the ability to detect trace constituents all directly affect the analytical results for parameters such as oxygen, nitrogen, carbon monoxide, carbon dioxide, total hydrocarbons, and hydrogen sulfide.

Launched by Liaoning Kerui Chromatography Technology Co., Ltd. The KR-LGS 2032 series benchtop gas chromatography platform is designed for precision laboratory analysis, offline sample testing, high-purity gas analysis, and routine measurements in complex environments. It is suitable for analyzing high-purity hydrogen, ultrapure hydrogen, electronic-grade specialty gases, industrial gases, standard gases, and multi-component gas samples.

The KR‑LGS 2032 series features a desktop‑integrated chassis, offering intuitive operation, convenient maintenance, strong scalability, and excellent analytical stability. To meet the testing requirements of the new national standard GB/T 3634.2‑2025 for high‑purity hydrogen, this platform can be flexibly configured with a variety of detectors, including FID, TCD, PDHID, ZD, and FPD, and can be paired with multi‑valve, multi‑column systems to enable broad‑range analysis—from major components to trace impurities.

IV. Two model options in the KR-LGS 2032 series

Depending on the laboratory’s spatial constraints, testing requirements, and valve‑block configuration needs, The KR-LGS 2032 series is available in two models:

Model number	Product positioning	Applicable Scenarios
KR-LGS 2032L	Large-capacity model	Suitable for complex configurations involving multiple valves, columns, and detectors.
KR-LGS 2032	Compact model	Suitable for single-valve, single-column, single-detector, or conventional detection configurations.

 

Among them, The KR-LGS 2032L is better suited for complex chromatographic system configurations in compliance with the new national standard for high-purity hydrogen, such as PDHID plus five valves and six columns, or FPD plus FID with four valves and three columns—ideal for multi‑channel, multi‑component analysis. In contrast, the KR-LGS 2032 is more appropriate for laboratories with limited space and relatively focused analytical needs.

 

The instrument dimensions are as follows:

 

Model number	Instrument dimensions (unit: mm)
KR-LGS 2032L	long 730 × width 590 × height 500, including valve box
KR-LGS 2032	long 645 × Width 475 × Height 525, including valve box

 

V. Core Configuration Advantages of the KR-LGS 2032 Series

1. Multi-detector configuration, covering the analysis of critical impurities in high-purity hydrogen.

The KR-LGS 2032 series can be optionally equipped with a variety of detectors, including TCD, FID, PDHID, ZD, and FPD, and supports the simultaneous installation of up to three detectors.

This multi-detector configuration capability enables The KR-LGS 2032 series meets the multi‑dimensional analytical requirements for high‑purity hydrogen, spanning from the evaluation of major‑component purity to the control of trace impurities.

2. Multi-valve, multi-column system, suitable for the separation of complex gas mixtures.

High-purity hydrogen contains low levels of target impurities, and its sample matrix is highly specific, placing stringent demands on the chromatographic separation system. The KR-LGS 2032 series supports multi-valve, multi-column configurations, enabling single‑run analysis of multiple components in complex samples, as well as fractionation and backflush protection.

The platform can be configured with multiple packed columns or capillary columns and supports heart-cutting, multi-column coupling, and backflush techniques. For the common challenges in high-purity hydrogen analysis, For parameters such as O2+Ar, N2, CO, CO2, H2S, and total hydrocarbons, a multi-valve, multi-column system can enhance separation efficiency, reduce interference from major components, and improve the reliability of trace‑component detection.

3. Precision temperature control ensures retention time and quantitative stability.

In chromatographic analysis, column oven temperature control directly affects peak shape, retention times, and quantitative reproducibility. The KR-LGS 2032 series features stable temperature control:

 

Temperature control parameters	Technical indicators
Column oven temperature range	30°C～400°C
Temperature control accuracy	±0.1°C
Number of temperature-programming steps	16-step or 32-step programmed temperature ramping
Heating rate	75°C/min, with an optional 130°C/min
Cooling rate	The standard cooling time from 400°C to 50°C is approximately 10 minutes; with the optional rapid‑cooling module, this can be reduced to about 3.5 minutes.

 

In the detection of trace impurities in high-purity hydrogen, a stable temperature-control system helps achieve improved retention-time reproducibility and enhanced quantitative-data stability, making it particularly well suited for batch sample analysis and long-term quality monitoring.

4. Flexible gas‑path control, balancing stability with operating costs.

The KR-LGS 2032 series supports fully digital electronic pneumatic control (EPC) and can also be configured to operate in mechanical valve‑based pneumatic control mode, depending on laboratory requirements.

 

Gas Path Configuration	Technical Features
All-digital EPC	Pressure accuracy is optional. 0.01 psi or 0.001 psi
Mechanical pneumatic circuit	Supports automatic switching; once analysis is complete, carrier gas consumption can be automatically reduced.
Automatic dual-gas-source switching	Prioritize the use of guaranteed gas supply; in the event of a gas outage, automatically switch to the backup gas source.
Carrier Gas Saving Mode	It can reduce operating costs and enhance the continuity of gas supply in the laboratory.

 

For high-purity hydrogen analysis, a stable, pure, and uninterrupted supply of carrier gas is essential. The gas‑path design of the KR‑LGS 2032 series helps enhance instrument operational stability and reduce routine analytical costs.

5. Automatic Sample Injection and Multi-Sample Compatibility

The KR-LGS 2032 series supports both autosampler and manual injection modes, can be configured with a ten-port valve, a six-port valve, valve‑injection, or needle‑injection, and offers optional single‑column or dual‑column autosamplers.

In the high-purity hydrogen analysis project, the instrument supports a gas sample inlet that is compatible with quantitative loops of various specifications, for example: 3 mL, 4 mL, and 1/8-inch specifications, among others; the capillary inlet supports both split and splitless modes, facilitating adaptation to various analytical tasks.

6. Intelligent Data Processing and Remote Management

The KR-LGS 2032 series supports networked data management and enables remote monitoring over local area networks and the Internet via an Ethernet communication interface. The system can collect signals from multiple detectors, facilitating centralized data management in laboratory settings.

Meanwhile, the workstation allows direct configuration of instrument parameters—including column temperature, flow rate, detector temperature, and temperature programming—enabling unified management of both instrument settings and data acquisition. For laboratories that conduct long-term high-purity hydrogen quality‑control testing and batch analyses, this feature helps enhance testing efficiency and improve data traceability.

7. Stable and reproducible performance, suitable for routine quality control.

The KR-LGS 2032 series delivers excellent stability:

 

Project	Technical indicators
Qualitative repeatability	RSD≤1%
Quantitative repeatability ( (7 injections are taken as the standard)	Constant RSD ≤ 0.5%–1%; trace levels RSD ≤ 1%–2%; ultra-trace levels RSD ≤ 2%–5%

 

In the high-purity hydrogen analysis experiment, Liaoning Kerui Chromatography achieved qualitative repeatability for the target analyte. Results with an RSD ≤ 1.5% and a quantitative repeatability RSD ≤ 3% can meet the requirements for trace impurity analysis in high-purity hydrogen and for routine quality control in industrial settings.

Six 、 Instrument One: O₂ +Ar, N₂ 、 CO, C O₂ High-sensitivity trace analysis

In high-purity hydrogen, the concentrations of oxygen, argon, nitrogen, carbon monoxide, carbon dioxide, and other impurities are extremely low, demanding stringent separation performance and placing high requirements on detector sensitivity and system cleanliness.

Liaoning Kerui Chromatography recommends the following configuration:

KR-LGS 2032 Host +PDHID detector+ 3 Valve 4 column

This configuration is suitable for high-purity hydrogen. O₂ +Ar, N₂ 、 CO, C O₂ High-sensitivity analysis of trace components. The PDHID detector features high sensitivity, a wide response range, and suitability for analyzing permanent gases and trace impurities, making it ideal for applications involving high-purity hydrogen, ultrapure hydrogen, and other high-purity gases.

Instrument 1. Experimental Data

Component	Limit of detection
O₂+Ar	5ppb
Carbon dioxide	2ppb
N₂	6ppb
CO	10ppb

As can be seen from the experimental data, this configuration is effective for… O₂ +Ar, N₂ 、 CO, C O₂ All possess With ppb-level detection capability, it meets the sensitivity and stability requirements for trace impurity analysis in high-purity hydrogen.

Seven 、 Instrument II: Hydrogen Sulfide and Total Hydrocarbon Detection

In addition to inorganic trace impurities, GB/ T 3 634.2-2025 also provides methodological guidelines for the determination of total hydrocarbons and hydrogen sulfide. Total hydrocarbons are typically expressed as methane and serve as an indicator of the level of hydrocarbon impurities in hydrogen; hydrogen sulfide, meanwhile, is a critical impurity that can adversely affect catalysts, fuel cells, and certain high-end applications.

Liaoning Kerui Chromatography recommends the following configuration:

KRLGS-2032 host unit + FPD detector + FID detector + 4-valve, 3-column system

Among them, The FPD detector is suitable for sulfide detection, while the FID detector is ideal for total hydrocarbon analysis. With a system configuration featuring four valves and three columns, it can achieve… H₂S And targeted analysis of total hydrocarbons.

Instrument II. Experimental Data

Component	Limit of detection
H₂S	20ppb
Total hydrocarbons (Expressed as methane)	50ppb

 

This method is suitable for quality control of hydrogen sulfide and total hydrocarbon impurities in high-purity hydrogen and can be used for factory acceptance testing, customer acceptance, third-party testing, and laboratory analysis.

Eight , System repeatability performance

High-purity hydrogen analysis not only demands a low detection limit but also requires stable repeatability. According to chromatographic experimental data from Liaoning Kerui, the repeatability of this high-purity hydrogen analysis method is as follows:

Project	Repeatability
Qualitative repeatability	RSD≤1.5%
Quantitative repeatability	RSD≤3%

Stable repeatability facilitates batch sample testing, long-term quality monitoring, and traceability of test results, while also helping laboratories establish standardized testing procedures.

Nine , Correspondence between each test item and its corresponding method

Combine GB/ T 3 634.2-2025-related methodological requirements: The test items and methods for high-purity hydrogen may be referenced as follows:

Test Items	Recommended Testing Approach	Relevant methodological basis
O₂	Trace oxygen or chromatographic detection	GB/T 6285, GB/T 28726
Ar	Gas chromatography	GB/T28726
N₂	Gas chromatography	GB/T28726
CO	Gas chromatography	GB/T 28726, GB/T 8984
Carbon dioxide	Gas chromatography	GB/T 28726, GB/T 8984
Total hydrocarbons (Expressed as methane)	FID gas chromatography	GB/T8984
H₂S	FPD gas chromatography	GB/T28727
Moisture	Dew-point method or cavity ring-down spectroscopy	GB/T 5832.2, GB/T 5832.3
Sampling	Guidelines for Gas Analysis Sampling	GB/T43306

It should be noted that, depending on the purity requirements for pure hydrogen, high-purity hydrogen, and ultrapure hydrogen, it is generally recommended to equip moisture‑measurement systems with either a dew‑point meter or a cavity‑ring‑down spectroscopy moisture analyzer. For ultrapure hydrogen analysis, the sampling system and tubing materials can also significantly affect the accuracy of the moisture‑detection results.

Ten Why does high-purity hydrogen analysis require a multi-valve, multi-column system?

High-purity hydrogen samples contain low levels of impurities, and the properties of the various components vary significantly; a single chromatographic column or a single detector often cannot adequately address all analytical requirements.

The value of a multi-valve, multi-column system is primarily reflected in:

Achieve efficient switching and separation of different components;

Reduce the influence of hydrogen, the primary component, on the detection system.

Enhance O₂ +Ar, N₂ 、 CO, C O₂ The separation performance for trace components;

Supports the collaborative operation of multiple detectors;

Enhance the stability and accuracy of analyzing complex, high-purity gas samples.

Adopted by Liaoning Kerui Chromatography 3 Valve 4 Columns and The four-valve, three-column configuration is specifically designed to address the separation characteristics of various impurity components in high-purity hydrogen, thereby enhancing analytical efficiency and data reliability.

 

Eleven Who is this solution suitable for?

Liaoning Kerui Chromatography GB/ T 3 634.2-2025 High-Purity Hydrogen Testing Protocol is applicable to:

Customer Type	Typical Requirements
High-purity hydrogen production enterprise	Factory inspection, batch quality control, product grading
Gas company	High-purity hydrogen filling, sales, and customer acceptance
Third-party testing agency	Establish testing capabilities that comply with the new national standards.
Hydrogen energy enterprise	Confirmation of raw material hydrogen quality and analysis of process hydrogen
Electronic specialty gas user	Incoming inspection of high-purity hydrogen and impurity control
Research institutes and university laboratories	Verification of the Quality of High-Purity Hydrogen for Experimental Use
System integrator	Complementary testing for hydrogen production, purification, and filling systems

Twelve , Configuration Recommendations for Liaoning Kerui Chromatography

Around GB/ T 3 634.2-2025 High-Purity Hydrogen Testing: Recommended Configuration as Follows:

Detection Task	Instrument Configuration	Testing capability
O₂+Ar, N₂, CO, CO₂	KR-LGS 2032+PDHID+3-valve 4-column	ppb-level inorganic trace impurity analysis
H₂S, total hydrocarbons	KR-LGS 2032+FPD+FID+4-valve, 3-column	Detection of ppb-level sulfides and hydrocarbons
H₂O	Dew-point meter or cavity-ring-down spectroscopy moisture analyzer	Trace Moisture Detection
Sampling system	Dedicated sampling lines, valves, and pressure-reducing systems for high-purity gases	Reduce pollution, adsorption, and leakage impacts.
Exhaust gas treatment	Hydrogen exhaust gas safe venting or treatment system	Meet hydrogen detection safety requirements

With the aforementioned configuration, a relatively complete national‑standard testing system for high‑purity hydrogen can be established, covering the major impurity‑detection parameters in high‑purity hydrogen.

Ten Three , Conclusion

GB/ T 3 The implementation of GB/T 634.2‑2025 will drive a shift in high-purity hydrogen testing—from “purity assessment” to “precise control of trace impurities.” For manufacturers of high-purity hydrogen and end‑users, proactively establishing testing capabilities that comply with the new national standard will help improve product quality, meet customer acceptance criteria, and strengthen market competitiveness.

Liaoning Kerui Chromatography Technology Co., Ltd. is based on KR-LGS 2032 Gas chromatography platform, combined with PDHID, FPD, FID, and multi-valve, multi-column systems can provide a systematic solution and instrument configuration recommendations for compliance with the new national standard for high-purity hydrogen, covering… O₂ +Ar, N₂ 、 CO, C O₂ 、 H₂S Key impurity parameters, such as total hydrocarbons, provide reliable technical support for the quality control of high-purity hydrogen.