Health & Safety

  • Reliable Methane Gas Monitoring Using Infrared Sensors

Reliable Methane Gas Monitoring Using Infrared Sensors

Oct 10 2018 Read 350 Times

Methane detectors are essential for monitoring safety and efficiency in a wide range of applications.

Gas detectors that can detect and quantify industrial and environmental gases like carbon monoxide, carbon dioxide, and methane play a vital role in ensuring the safety and efficiency of a wide variety of processes and applications. Only 30 years ago, miners were still using canaries to warn them of high levels of carbon monoxide or methane present in the mine. Thankfully, sensor technology has moved forward, and there are an ever-increasing number of options available for gas detection.

Gas detectors are widely used to detect leaks and monitor methane concentrations

Natural gas, which mainly consists of methane, is widely used in power generation. However, methane is a greenhouse gas, extremely flammable, and can form explosive mixtures in air. Methane leaks can have devastating results, so detecting leaks is vital during natural gas extraction, transportation, and power generation.

In the chemical industry production of syngas, methanol, acetic acid and other commodity chemicals depend on methane gas sensors to ensure that processes are operating safely and efficiently. Measuring atmospheric levels of methane is also becoming increasingly important for monitoring changing environmental conditions that may affect the environment and human health.

Commercially available gas detection technologies

There are a wide range of commercially available methane gas detectors and sensors, all with their own advantages and disadvantages:

1. Flame ionized detectors (FIDs)

FIDs use a hydrogen flame to ionize the methane gas. The ionized gas conducts an electrical current, which is measured to determine the gas concentration. Although FIDs are fast and accurate, they require the presence of a hydrogen source, an open flame, and a clean air supply. As a result, FIDs are not suitable for some applications.

2. Catalytic sensors

Catalytic sensors catalyze the reaction between methane and oxygen, resulting in heat generation and a change in resistance in the sensor, from which the methane concentration can be calculated. Although catalytic sensors are inexpensive and robust, they require oxygen to operate and are susceptible to poisoning, sintering, and contamination. As a result, regular calibration and replacement is required.

3. Semiconductor sensors

In a similar manner to catalytic sensors, semiconductor sensors react with methane, causing a change in resistance that is used to calculate the gas concentration. In common with catalytic sensors, semiconductor sensors are prone to contamination and poisoning.

4. Electrochemical sensors

Electrochemical sensors oxidize or reduce the methane at an electrode to produce a current, which is used to determine the gas concentration. Due to the contact between the atmosphere and the electrode, corrosion and chemical contamination can occur, and electrochemical sensors need frequent replacement.

5. IR sensors

IR sensors use an IR beam to detect and quantify gases present in the atmosphere. Although infrared sensors are slightly more expensive than some other sensors, they are robust and long-lasting. As a result, infrared sensors have become the dominant technology for detecting a range of gases.

This article explains why infrared (IR) sensors are the preferred option for methane detection. View it online at Edinburgh Sensors.

Read comments0

Do you like or dislike what you have read? Why not post a comment to tell others / the manufacturer and our Editor what you think. To leave comments please complete the form below. Providing the content is approved, your comment will be on screen in less than 24 hours. Leaving comments on product information and articles can assist with future editorial and article content. Post questions, thoughts or simply whether you like the content.


Digital Edition

International Environmental Technology October 2018

October 2018

In This Edition Gas Detection - Flammable Gas Dectection In Coal Mines - Protective concepts in combustible gas and vapor detection - The only line of gas sensing elements with SIL2 capabil...

View all digital editions

Events

WETEX 2018

Oct 23 2018 Dubai, UAE

Pol Eco System

Oct 23 2018 Poznan, Poland

WASMA

Oct 23 2018 Moscow, Russia

Watec Italy

Oct 24 2018 Cremona, Italy

FiGas

Oct 25 2018 Lima, Peru

View all events