A gas detector gauges the grouping of specific gases in an air space as part of a safety system. These battery-operated units signal dangerous levels via alarms or lights. Generally deployed in confined spaces to prevent toxic exposure and fire risk, the devices are available as portable or stationary (fixed) units and can be configured with a number of different sensor options including oxygen (O2), combustible gases or fumes (LEL), hydrogen sulfide (H2S), and carbon monoxide (CO). Unlike earlier detectors which only recognized one type of gas, current instruments can screen multiple gas flows simultaneously to ensure that an unsafe mix is not present.
These sensors detect toxic and flammable gases in the workplace to provide protection for personnel. They are usually worn on the person in a region of the body that is close to the nose and mouth, or placed strategically around an area where hazardous gases may accumulate.
Gas Detectors for Home Safety: A Comprehensive Review
Using various technologies such as infrared, photometric, and electrochemical, these devices sense the presence of harmful gas by comparing the absorption of certain wavelengths of light in the device to a standard. In addition to detecting oxygen depletion and combustible gases, some models can also identify the distinct sound of pressurized gas leaks.
As with all sensing instruments, it is important to keep in mind that the accuracy specifications on these devices are not absolutes. Over time all sensors, including those in gas detectors, degrade. For this reason it is always recommended that a daily bump test be performed on the instrument before deploying it in LIFE THREATENING applications where an incorrect reading could lead to significant illness or death.