SMT-04B is a semiconductor type gas sensor used to detect combustible gases such as methane and natural gas. The conductivity of the gas-sensitive material of the sensor will change accordingly with the concentration of the measured gas. A simple test circuit can be used to convert the change in conductivity into an output signal corresponding to the gas concentration. The sensor has a strong anti-interference ability to alcohol and some other interfering gases.
● Civilian gas leak detector and alarm
● Portable gas detector
● High sensitivity
● Stable performance
● Fast response and recovery time
● Good shock resistance
● Strong anti-interference ability
● Long life time
| Item | Parameter |
| Detection Gas | Methane Natural gas |
| Detection Concentration Range | 300～10000ppm(methane) |
| Heating Voltage(VH) | 5V±0.1V DC or PWM |
| Sensor Working Voltage | ≤24V DC |
| Heating Element Resistance (RH) | 29Ω±3Ω (room temperature) |
| Heating Power (PH) | ≤950mW |
| Sensitivity (S) | Rs(in air)/Rs(5000ppm CH 4 )≥ 5 |
| Output Voltage Range (VS) | 2.5V～4.0V(in 5000ppmCH 4 ) |
| Concentration Response Ratio | ≤0.6(R5000ppm/R1000ppm CH 4 ) |
| Test Environment | 20℃±2℃; 55%±5%RH |
| Life Time | 10 years |
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