MQ696B Semiconductor Alcohol Sensor
Principle Introduction:
Strong First Electronics manufacture mini size alcohol sensors for gift-type breathalyzer use.
Sensitive material of MQ696B gas sensor is semiconductor material which is with lower conductivity in clean air. When the target alcohol gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.
Applications :
It has high sensitivity to alcohol and quick response and resume, widely used in portable alcohol gas detector.
Technical parameters :
| Model | MQ696B | ||
| Sensor Type | Semiconductor | ||
| Standard Encapsulation | Metal | ||
| Target Gas | Alcohol gas | ||
| Detection range | 20~ 500ppm alcohol | ||
| Standard Circuit Conditions | Loop Voltage | V H | 0.9V±0.1V AC or DC |
| Heater Voltage | V c | ≤6V DC | |
| Load Resistance | R L | Adjustable | |
| Heater Resistance | RH | 4.0Ω±0.5Ω（room temp.） | |
| Heater consumption | PH | ≤140mW | |
| Sensor character under standard test conditions | resistance of sensitive material | R0 | 1KΩ～400KΩ(in air) |
| Sensitivity | S | R0(in air)/Rs(in 125ppm C2H5OH)≥3 | |
| Concentration Slope | α | ≤0.6(R300ppm/R50ppm C2H5OH) | |
| Standard test conditions | Tem. Humidity | 20℃±2℃ 55%±5%RH | |
| Standard test circuit | Vc:3.0V±0.1V DC VH: 0.9V±0.1V DC | ||
| Preheat time | Over 48 hours | ||
