Combustible gas detection

Catalytic Sensor: This technology is used to detect combustible gases such as hydrocarbons and it uses the science of catalytic oxidation to do its job. The sensor of this type of detector is primarily designed with platinum treated coils. When the combustible gas comes into contact with the catalytic surface area, it is oxidized and the heat released changes the wiring resistance. Bridge circuits are often used to indicate resistance changes.

Infrared Sensors: These sensors are also known as infrared detectors. Infrared sensors detect combustible gases, especially hydrocarbon vapors, through a transmitter and receiver system. Typically, the transmitter is the light source and the receiver is the light detector. If gas is present in the optical path, it will trigger interference with the optical transmission power between the transmitter and receiver. The changing state of light determines whether and what type of gas is present. They can determine the presence of gas and specify the type of gas.
Infrared sensors use light-emitting transmitters and receivers to sense when gas is present. It interferes with the transmission of light and sounds an alarm.

Toxic gas detection

Electrochemical sensors or batteries: They are most commonly used to detect toxic gases such as carbon monoxide (CO 2 ), chlorine (Cl 2 ), and nitrogen oxides (NO x ). When gas is sensed, they act through electrode signals. This process is accomplished by allowing the gas to diffuse through the porous membrane to the electrodes where it is oxidized or reduced. Typically, these types of detectors are very sensitive and send a warning signal through an electrical current. Different manufacturers produce these detectors with digital displays. Electrochemical gas detectors are used in various environments such as oil refineries, gas turbines, chemical plants, underground gas storage facilities, etc.