IR Technology keeping workers safe and sound from flammable gases

Natural Gas (Methane) and LPG (Propane) are not only commonly used in a range of industries; they are also highly flammable and potentially dangerous gases. If any of these gases mix with air or Oxygen and are then exposed to an ignition source, the result will be possible injury and / or death of workers or members of the public.

With ignition sources being as diverse as naked flames, hot surfaces, mechanical sparks or static electricity, and electrical / electronic or mechanical equipment, and the concentrations needed for these mixtures to become explosive as low as 2.2% in air for Propane and 10% for Methane, the threshold for a disaster is lower than most people would think.

To help detect potentially hazardous gases such as Methane and Propane, RAE Systems MeshGuard uses an NDIR monitor – also known as non-dispersive infrared absorbance – as an effective, fast and efficient method.

It is called non-dispersive because the wavelength passes through the sampling chamber with an optical filter in front of the detector that eliminates all light except the wavelength that the selected gas molecules can absorb.

In technical terms, NDIR works by measuring the amount of absorbed inferred at the necessary frequency, the concentration of the gas component can be determined. Most molecules can absorb infrared light, causing them to bend, stretch or twist, with the amount of IR light absorbed is proportional to the concentration of gas.

MeshGuard’s NDIR combustible gas sensors also have a number of other advantages when compared to other types of sensors including not having a flame arrestor that limits the ability of large molecules to diffuse into the optical sensing chamber, only requiring low power, more stability, poison gas resistance, along with the ability to work in a range of inert atmospheres.

Overall, NDIR sensors also do not require oxygen and are also not subject to damage due to exposure to sensor poisons, and unlike many other gas sensors, NDIR sensors can be used for measuring high concentration combustible gas above the 100% Lower Explosive Limit (LEL) concentration.

Since MeshGuard is a networkable, intelligent and wireless gas monitoring solution designed for quick deployment in areas where low cost and high ROI solutions are required, safety personnel are provided with real time information from a network that quickly relays data regarding dangerous gases to an easy-to-understand central system.

The MeshGuard system includes a range of field-ready intrinsically safe sensors, multichannel controllers, PC management software, range extenders, routers, repeaters, data readers, and alarms.

Because the MeshGuard system includes powerful wireless sensors that can be deployed rapidly in any environment, MeshGuard eliminates the need for lengthy and costly installation projects.

By detecting and recording a wide range of deadly gases and quickly relaying the data to an easy-to-understand central system, safety personnel have up-to-date information from throughout the network of sensors at a finger’s touch.

With MeshGuard, RAE Systems is now able to provide the widest and most proven range of gas detection solutions to help organisations deliver around-the-clock monitoring and safety for deadly atmospheric-gas releases.

For more information about RAE Systems MeshGuard, go to

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