What Gases Can a Typical Combustible Gas Detector Identify?

Introduction

Combustible gas detector is an indispensable and important equipment in the field of industrial safety, which is widely used in oil and gas, chemical industry, mining industry, electric power, sewage treatment and other industries. Its main function is to monitor the concentration of combustible gas in the air in real time, and give an audible and visual alarm when the concentration reaches a dangerous level to remind staff to take timely measures to prevent accidents such as fire and explosion.

Knowing which gases can be detected by combustible gas detector is very important for selecting appropriate equipment, ensuring personnel safety and meeting safety regulations.

Common Detectable Combustible Gases

A typical combustible gas detector can usually detect a variety of flammable and explosive gases, mainly including the following categories:

1. Methane (CH)

Methane is the main component of natural gas and one of the most common combustible gases in industrial environment. It is widely used in natural gas transportation, oil exploitation, coal mine and biogas engineering.

2. Propane (C₃H₈)

Propane is commonly used in industrial fuels, liquefied petroleum gas (LPG) and heating systems. Due to its flammable characteristics, explosive mixed gas may be formed quickly after leakage.

3. Butane (CH)

Butane is widely used in lighter fuel, portable stoves and some industrial production processes, and continuous monitoring is needed to avoid safety risks.

4. Hydrogen (H)

Hydrogen is highly combustible and diffusive, and is commonly used in the fields of new energy, fuel cells, hydrogen production by electrolysis of water and chemical production.

5. Acetylene (C₂H₂)

Acetylene is widely used in metal cutting and welding operations, and its explosion limit range is wide, so the sensitivity of detection equipment is required.

In addition to the above gases, some high-performance combustible gas detectors can also detect:

• Gasoline vapor
• Alcohol vapor
• Benzene volatiles
• Industrial hydrocarbon gas
• Liquefied petroleum gas (LPG)
• Natural gas (NG)

The specific detectable gas type depends on the sensor type, calibration method and equipment design.

Working Principle of Combustible Gas Detector

At present, combustible gas detectors on the market mainly adopt the following detection technologies:

Catalytic Burning Sensor (Catalytic Burning Sensor)

This is the most widely used combustible gas detection technology in industrial field.

The working principle is that combustible gas is burned on the surface of catalytic element to generate heat, and the gas concentration is measured by detecting the temperature change.

Advantages:

• Lower cost
• Fast response speed
• Suitable for most combustible gases

Infrared Sensor (NDIR)

The infrared sensor judges the gas concentration by detecting the absorption of infrared light with a specific wavelength.

Advantages:

• Long service life
• Strong anti-poisoning ability
• Low maintenance cost

Especially suitable for petroleum, natural gas and chemical industry.

Electrochemical Sensor

Although it is mainly used for toxic gas detection, some multifunctional detection equipment will be combined with electrochemical sensors to realize simultaneous monitoring of combustible gas and toxic gas.

Why Is Combustible Gas Detection So Important?

The leakage of combustible gas is often concealed, and many gases only need very low concentration when they reach the explosion limit.

For example:

• The lower explosive limit (LEL) of methane in air is about 5%.
• The lower explosive limit of hydrogen is about 4%.

When the gas concentration is close to the explosion limit, any spark, static electricity or high temperature equipment may cause serious accidents.

By installing and using combustible gas detectors, enterprises can:

• Find gas leakage in advance
• Reduce the risk of fire and explosion
• Protect the life safety of employees
• Meet the requirements of safety production regulations
• Reduce equipment and property losses

Importance of Calibration and Maintenance

Even high-quality combustible gas detectors need regular maintenance and calibration.

The following measures are recommended:

• Perform Zero Calibration at regular intervals
• Span Calibration is performed regularly
• Check the sensor status
• Test alarm function
• Replace or charge the battery as required

The maintenance of the specification can ensure the accuracy and reliability of the test results, and avoid missing or false positives.

Conclusion

The combustible gas detector can detect a variety of common flammable and explosive gases, including methane, propane, butane, hydrogen, acetylene and other industrial hydrocarbon gases. By choosing appropriate detection technology and insisting on regular calibration and maintenance, enterprises can find the risk of gas leakage in time, effectively prevent fire and explosion accidents, and provide reliable security for workers and production facilities.

For oil and gas, chemical industry, mining industry, manufacturing industry and energy industry, deploying high-performance combustible gas detection system has become an important part of modern industrial safety management.