About Point-Gas Detection Technology

About Fixed Gas Detectors

Accurately detect combustible and toxic gas leaks before they can create hazardous situations.

Point-Gas Detection Technology

Fixed Gas Detection Solutions

Fixed gas detection solutions are used to detect gas leaks and inadvertent releases of combustible and toxic gases, often in enclosed areas. Fixed point gas detectors are permanently mounted in places where there is potential for a gas leak to occur - providing vital protection of personnel, equipment and facilities. These gas detectors typically communicate to higher level safety or control systems.

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How it Works

Catalytic Detection

Gas detectors that use catalytic sensors work by measuring the voltage change produced from the catalytic combustion of the sensor’s target gas. When exposed to a target gas, it oxidizes, increasing the temperature along with the sensor resistance. The offset voltage created by the higher temperature creates a sensor signal warning of a gas leak. Catalytic gas detectors can detect both organic and inorganic  gases, as well as gas mixtures. 

Electrochemical Detection

Gas detectors that use electrochemical detection work by generating a current when toxic gas molecules react on the sensing electrode. The current generated directly relates to the amount of toxic gas present. Electrochemical gas detectors are ideal for detecting hydrogen sulfide, oxygen and carbon monoxide. 

Toxic Gas Detectors

Toxic gas detectors detect accumulated gas and initiate an alarm signal to give warnings or allow shutdown of equipment before the atmosphere gets to a harmful level.

The measurements most often used for the concentration of toxic gases are parts per million (ppm) and parts per billion (ppb).

  • For example, 1ppm would be equivalent to a space filled with a total of 1 million balls and 1 of those balls being red. The red ball would represent 1ppm.
    • 100%V/V  = 1,000,000 ppm
    • 1%V/V  = 10,000 ppm 

Combustible Gas Detectors

Fixed combustible gas detectors look for gases and flammable vapors before they can ignite because a combustible gas only needs oxygen and an ignition source to create hazardous conditions. That's why detecting combustible gas leaks before ignition occurs is critical to preventing dangerous fires and explosions.

There is a limited band of gas/air concentration which will produce a combustible mixture. This band is specific for each gas and vapor and is bounded by an upper level, known as the Upper Explosive Limit (UEL) and a lower level, called the Lower Explosive Limit (LEL).

Gas Detector Placement

Fixed gas detectors could be placed in areas with potential leak points. As a gas cloud needs to come into contact with a gas sensor to signal a warning, and since ambient air movement affects where a gas cloud may drift, multiple gas detectors could be used.

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