Types and characteristics of gas detectors
A gas detector is an instrument for detecting gas concentration. The instrument is suitable for dangerous places with flammable or toxic gases, and can continuously detect the content of the measured gas in the air within the lower explosion limit for a long time. Can be widely used in gas, metallurgy, steel, coking, electric power and other industries with flammable or toxic gases. Gas detectors are ideal monitoring instruments for property and personal safety. Therefore, today we will introduce the gas detector to you. We hope that after reading this you will understand why you need a basic understanding of gas detectors.
The gas detector uses high-performance catalytic combustion sensors and electrochemical gas sensors as detection elements. The gas detector has the characteristics of high sensitivity, fast response time, high explosion-proof level, and convenient installation.
The gas detector can detect:
Combustible gases: natural gas (methane), liquefied petroleum gas, coal gas (hydrogen), acetylene, pentane, alkyne, acetone, toluene, alcohols, hydrocarbons, light oil, etc.
Toxic gases: carbon monoxide, hydrogen sulfide, ammonia, chlorine, oxygen, phosphine, sulfur dioxide, hydrogen chloride, chlorine dioxide and other toxic and harmful gases.
Classification of gas detectors
Electrochemical gas detector: Gas diffuses through the back of the porous membrane into the working electrode of the sensor, where the gas is oxidized or reduced. This electrochemical reaction causes the current flowing through the external circuit to change, and the gas concentration can be measured by measuring the magnitude of the current.
Catalytic combustion gas detector: The catalytic combustion gas detector is a high temperature sensor. The detection element of the catalytic element is a platinum wire coil wrapped into a spherical shape with alumina and a binder and sintered. The outer surface of the element is coated with a catalytic layer of rare metals such as platinum and palladium. A current is passed through the platinum wire to keep the detection element at a high temperature.
Infrared Gas Detectors: Molecules composed of different atoms have unique vibration and rotation frequencies. When a molecule is irradiated with infrared light of the same frequency, infrared absorption occurs, causing a change in the intensity of the infrared light. Gas concentrations can be measured by measuring changes in infrared intensity.
Use electrochemical and catalytic combustion sensors (combustible gases) or infrared.
Stable performance, high precision, fast response.
low power consumption.