Gas detection systems are designed to detect hazardous gas levels. These systems can be installed in commercial and residential buildings as well as public spaces such as schools, hospitals, and nursing homes. Gas detectors come in different types and configurations, depending on their usage. This blog post will cover the types of gas sensors and detection systems, how they work, and how gas is detected. Read on!
A lens focuses these exiting photons onto a sensor that converts them into an electrical signal proportional to the wavelength emitted by the gas in question. The electrical signal can be used to indicate the presence of gas.
Over-exposure gas detection systems are designed to detect gas at hazardous levels, typically leading to death or severe injuries if left unattended. These systems are used in industrial sites, public places, and locations where gas may be present at dangerous levels.
Under-exposure gas leak detection systems measure the presence of gases at low levels that aren't immediately hazardous. They are typically used in residential homes, commercial buildings, and locations where the presence of gas may not be dangerous but require monitoring.
These are gas leak detector sensors made from silicon and a semiconducting material. They work by oxidizing the gas at the surface of a specially-prepared metal-oxide wafer, which completes a circuit. Changing the concentration of gas only changes the resistance between electrodes, which is then easily measured.
Chemical sensors work by coating a surface with a chemical that reacts with specific gases in the air. These sensors can detect a broader range of gases, and they are less susceptible to false readings. However, they take more time to detect gas levels.
ISFET is a natural gas detector containing a diode that's sensitive to changes in electric potential when differentiating different gases. These gases include hydrogen and carbon monoxide, which are fatal.
These systems can detect a wide range of gases, including methane and hydrogen. The sensors contain two electrodes that generate an electric field in the air surrounding them. This, in turn, generates a positive and negative ion. When exposed to light, the positive and negative ions can't neutralize each other. As such, they're attracted to a negatively charged grid.
A gas detector works by measuring the volume of one or more gases in a given air volume. Depending on the sensor used, they determine the gas concentration of any flammable or toxic gases in the air and issue alerts when they reach dangerous levels.
Calibration gas detectors also work by measuring the amount of energy in beams emitted when a gas is introduced into the detector. A small portion of that beam is then monitored with a sensor, and if there is any change in its intensity over time, it means there is some level of gas present in the air sample.
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