سنسور گاز MQ3:
MQ3 Alcohol Gas Sensor detects the concentrations of alcohol gas in the air and out puts its reading as an analog voltage. The sensor can measure concentrations of 0.04mg/L to 4mg/L.concentration sensing range is suitable for breathalyzers. sensor can operate at temperatures from -10 to 50°C and consumes less than 150 mA at 5 V.
Connecting five volts across the heating (H) pins keeps the sensor hot enough to function correctly. Connecting five volts at either the A or B pins causes the sensor to emit an analog voltage on the other pins. A resistive load between the output pins and ground sets the sensitivity of the detector. The resistive load should be calibrated for your particular application using the equations in the datasheet, but a good starting value for the resistor is 200 kΩ.
MQ3 Alcohol Gas Sensor – General Specifications
High sensitivity to Alcohol Gas
Long life and low cost
Simple drive circuit
مشخصات سنسور گاز MQ3:
MQ3 Alcohol Gas Sensor – Technical Specifications
Detection Gas: Alcohol Gas
Concentration: 0.4mg/L – 4mg/L
Supply Voltage: <24V
Heater Voltage: 5.0V ± 0.2V (High), 1.5V ± 0.1V (Low)
Load Resistance: Adjustable
Heater Resistance: 31Ω ± 3Ω
Heater Consumption: <900mW
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