The SMT-028 is a semiconductor type gas sensor used to detect toluene in gas. The conductivity of the gas-sensitive material of the sensor will change accordingly with the concentration of the target gas. Using a simple test circuit, this change in conductivity is converted into an electronic signal output and corresponds to the corresponding target gas concentration, thereby realizing gas detection. The sensor is packaged in a four-pin metal shell and is a low-cost sensor suitable for a variety of applications.
● Civilian toluene alarm
● Portable toluene alarm
● Industrial toluene alarm
● High sensitivity
● Fast response and recovery time
● Long life
● Low cost
● The test circuit is simple
| Item | Parameter |
| Detection Gas | Toluene, alcohol, etc. |
| Detection Concentration Range | 5～500ppm(Toluene) |
| Heating Voltage(VH) | 5V±0.1V DC or PWM |
| Sensor Operating Voltage | ≤24V DC |
| Heating Unit Resistance (RH) | 65Ω±10Ω (room temperature) |
| Heating Power Consumption (PH) | 380mW±25mW |
| Sensitivity (S) | Rs (in air)/ Rs (50ppm toluene) ≥ 2 |
| Output Voltage (VS) | ≥0.5V (in 50ppm toluene) |
| Concentration Response Ratio | ≤0.6(R200ppm/R50ppm toluene) |
| Test Environment | 20℃±2℃; 55%±5%RH |
| Life | 5 years |
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