Product Description:
YJJ EX-100%LEL Combustible Gas Sensor Is Used In Portable Fixed Gas
Detectors
Features:
Gas sensors for combustible gases mainly detect gas concentrations
through principles such as catalytic combustion, semiconductor,
infrared and electrochemistry. Among them, catalytic combustion
type is widely used in industrial fields due to its high stability.
Catalytic combustion sensor
Principle: Combustible gas undergoes flameless combustion on the
surface of the platinum resistor under the catalytic effect of the
catalyst, generating heat that causes the resistance value to
change. The voltage difference signal resulting from the imbalance
of the bridge circuit reflects the concentration of the gas.
Features: High precision, fast response, approximately 3-year
lifespan, but susceptible to poisoning by sulfides, etc.
Semiconductor sensor
Principle: When metal oxides (such as tin dioxide) adsorb gases at
high temperatures, their electrical conductivity changes, and the
resistance value is proportional to the gas concentration.
Characteristics: Low cost, high sensitivity, but poor stability,
long preheating time. Mostly used in civilian equipment.
Infrared optical sensor
Principle: By utilizing the absorption characteristics of gases to
specific wavelengths of infrared light, the concentration can be
calculated based on the absorption intensity. This method is
applicable to carbon-hydrocarbon compounds such as methane.
Features: Strong anti-interference ability, long service life, but
high cost and ineffective for non-carbon-hydrocarbon gases.
Specifications:
| Recommended load resistance | 10Ω |
| Operating temperature range | -30°C to +50°C |
| Pressure range | 800 - 1200 mbar |
| Humidity range | 15% - 95% RH |
