The KGS 101 is an SnO2 semiconductor gas sensor and is used in gas detection, air cleaning system, auto-ventilation system, micro wave oven, etc. In a clean atmosphere, the resistance of the sensor is high. However, with the increase of water vapor or gas concentration in the atmosphere, the resistance decreases. The KGS 101 gas sensor features high stability against air flow, superb response time and excellent durability.
 Power Consumption    800 ± 50 mW
 Heater Current    160 ± 10 mA
 Heater Voltage    AC or DC 5 V
 Circuit Voltage    AC or less than DC 12 V (DC 5V recommended)
 Load    Variable
 Operating Temp. & Humidity    -10℃ ~ 50℃, 30~85%RH
 Storage Temperature    -30℃ ~ 50℃
 Sensor Resistance
 (in clean air at 25℃, 60% RH)
   20~80 kΩ
 Gas Sensitivity
 Rs (CH4 1000ppm)/ Rs (air)
   < 1/3
 Hydrocarbons    Methane, Propane, Butane, Hexane, Gasoline, Acetylene,
   Ethylene, Butylene, Benzene, Toluene, etc.
 Halogenized Hydrocarbons    Methyl Chloride(CH3CI) , Ethyl Chloride, Vinyl Chloride, etc.
 Alcohols    Methanol, Ethanol, Propanol, Butanol, etc.
 Ethers    Methyl Ether, Ethyl Ether, etc.
 Ketones    Acetone, Methyl Ethyl Ketone, etc.
 Esters    Methyl Acetate, Ethyl Acetate, Butyl Acetate, etc.
 Nitrogen Compounds    Nitro Methane, Methyl Amine, Ethyl Amine, etc.
 Inorganic Gas & Others    Ammonia, Carbon Monoxide, Hydrogen, Hydrogen Sulphide,
   Smoke, etc.
The variation in resistance of the sensor(Rs) is measured as a change in the voltage across the load
resistor(RL). The sensor resistance (Rs) is calculated from output voltage(VRL) by the following formular.
Rs = (Vc / VRL -1) x RL