Hydrogen Flow Measurement for Industrial Applications

Introduction

Hydrogen is increasingly used across industrial and energy applications, from refining and chemical processing through to emerging hydrogen production and energy systems.

Accurate flow measurement is essential to ensure safe handling, efficient usage and reliable process control. However, hydrogen presents unique challenges due to its low density, high diffusivity and wide operating range.

Selecting the right measurement technology is critical to achieving stable and dependable performance in real-world conditions.

The Problem

Hydrogen is one of the most difficult gases to measure accurately, particularly in industrial environments where operating conditions can vary.

Common challenges include:

• Very low gas density affecting measurement sensitivity
• Wide flow range from low process flow to high demand conditions
• High diffusivity leading to potential leakage and measurement instability
• Variable pressure and temperature conditions
• Requirement for high accuracy in cost-sensitive or safety-critical applications
• Need for reliable performance in hazardous environments

Without accurate measurement, operators may struggle to control processes, manage costs or ensure safe operation.

 

The Solution

Thermal mass flow measurement provides a reliable and widely used solution for hydrogen flow monitoring, offering direct mass flow measurement without the need for pressure or temperature compensation.

These systems are well suited to hydrogen due to their sensitivity to low flow rates and ability to handle wide turndown ratios. They are commonly used alongside applications such as Nitrogen Purge Monitoring, where inerting systems support hydrogen safety, and Vent Gas Monitoring, where leak detection and emissions control are critical.

In higher-spec or custody-related applications, alternative technologies such as ultrasonic or Coriolis meters may also be considered, depending on accuracy requirements and system design.

 

Technical Insight

Hydrogen flow measurement requires careful consideration of both gas properties and operating conditions.

Low density and high velocity

Hydrogen has a very low density compared to other gases, meaning flow velocities can be high even at relatively low mass flow rates. Measurement systems must be capable of handling this effectively.

Wide turndown requirement

Applications often require measurement across a wide flow range, from low standby flows to high operational demand.

Leakage and safety considerations

Hydrogen is highly diffusive and can escape through small gaps, making accurate measurement and leak detection critical.

Temperature and pressure variation

Hydrogen systems can operate across a wide range of conditions, requiring measurement technologies that remain stable and accurate.

Hazardous area compliance

Instrumentation must be suitable for use in hazardous environments, often requiring ATEX certification and, in some cases, SIL-rated functionality.

 

Technology selection

• Thermal mass flow meters: Ideal for general industrial applications with good low-flow sensitivity
• Coriolis meters: High accuracy for critical applications, but higher cost
• Ultrasonic meters: Suitable for larger pipelines and higher flow rates

 

Recommended Products

Thermal Mass Flow Meters

Provide accurate, reliable hydrogen flow measurement with excellent low-flow sensitivity and minimal maintenance.

Gas Detectors

Used alongside flow measurement to detect hydrogen leaks and ensure safe operation in process environments.

 

Key Benefits

• Accurate measurement of hydrogen usage and flow
• Improved process control and efficiency
• Enhanced safety through reliable monitoring
• Suitable for wide flow ranges and varying conditions
• Low maintenance with no moving parts
• Supports emerging hydrogen and energy applications