SMT-003 is a semiconductor type gas sensor designed to detect alcohol content in the environment. The conductivity of gas-sensitive material in the sensor will change accordingly with the concentration of the target gas. A simple circuit can be used to convert the change in conductivity into an output signal corresponding to the gas concentration.
● Car alcohol gas alarm
● Portable alcohol detector
● High sensitivity
● Stable performance
● low cost
● long life
● Compact size
| Item | Parameter |
| Detection Gas | Alcohol vapor |
| Detection Concentration Range | 25～500ppm alcohol |
| Heating Voltage (VH) | 0.9V ±0.1V DC or PWM |
| Load Resistance (RL) | Adjustable |
| Sensor Operating Voltage | ≤6V DC |
| Heating Element Resistance (RH) | 4.0Ω±0.5Ω (room temperature) |
| Heating Power (PH) | ≤ 1 4 0mW |
| Sensor Resistance | 1KΩ ～ 400KΩ ( in air ) |
| Sensitivity | R 0 (in air)/R s (in 125ppm alcohol) ≥ 3 |
| Concentration Response Ratio | ≤0.6(R300ppm/R50ppm alcohol) |
| Test Environment | 20℃±2℃; 55%±5%RH |
| Standard Test Circuit | Vc:3.0V±0.1V DC; VH: 0.9V±0.1V DC |
| Preheating Time | Not less than 48 hours* |
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