[shortdesc]Application:It is widely used in domestic alcohol gas alarm, industrial alcohol gas alarm and portable alcohol detector.
Feature:It has good sensitivity to alcohol in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
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Production Description:
Sensitive material of MQ-3B gas sensor is SnO2, which with lower conductivity in clean air. When the target alcohol gas exist, 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.
MQ-3B gas sensor has high sensitivity to alcohol gas and can resistant to the interference of gasoline, smoke and vapour. It is with low cost and suitable for various applications of detecting alcohol at different concentration.
Feature:
It has good sensitivity to alcohol in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
Application:
It is widely used in domestic alcohol gas alarm, industrial alcohol gas alarm and portable alcohol detector.

Technical Parameters：

Model			MQ-3B
Sensor Type			Semiconductor
Standard Encapsulation			Plastic cap
Target Gas			Alcohol gas
Detection range			25~500ppm alcohol
Standard Circuit Conditions	Loop Voltage	Vc	≤24V DC
	Heater Voltage	VH	5.0V±0.1V AC or DC
	Load Resistance	RL	Adjustable
Sensor character under standard test conditions	Heater Resistance	RH	29Ω±3Ω (room tem.)
	Heater consumption	PH	≤900mW
	Sensitivity	S	Ro(in air)/Rs(125ppm C2H5OH)≥5
	Output Voltage	Vs	2.5V~4.0V (in125ppm C2H5OH)
	Concentration Slope	α	≤0.6(R300ppm/R50ppmC2H5OH)
Standard test conditions	Tem. Humidity		20℃±2℃；55%±5%RH
	Standard test circuit		Vc:5.0V±0.1V VH:5.0V±0.1V
	Preheat time		Over 48 hours
O2 concentration			21%VOL（no less than 18%VOL）
Lifetime			10 years

10 pcs MQ-3B Semiconductor Sensor for Alcohol Gas