About Fixed Gas Detectors
Accurately detect combustible and toxic gas leaks before they can create hazardous situations.
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- Measurement Instrumentation
- Flame and Gas Detection
- About Point-Gas Detection Technology
Accurately detect combustible and toxic gas leaks before they can create hazardous situations.
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.
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.
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 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).
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).
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.
