MQ-3 데이터시트 PDF

MQ-3 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.

미리보기를 사용할 수 없습니다

MQ-3 Semiconductor Sensor for Alcohol

Sensitive material of MQ-3 gas sensor is SnO2, which with lower conductivity in clean air. When the

target alcohol gas exist, The sensor’s conductivity is more higher along with the gas concentration rising.

Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas

concentration.

MQ-3 gas sensor has high sensitity to Alcohol, and has good resistance to disturb of gasoline, smoke

and vapor. The sensor could be used to detect alcohol with different concentration, it is with low cost and

suitable for different application.

Character

* Good sensitivity to alcohol gas

* Long life and low cost

* Simple drive circuit

Configuration

Application

* Vehicel alcohol detector

* Portable alcohol detector

Technical Data

Basic test loop

Model No.

Sensor Type

Standard Encapsulation

Detection Gas

Concentration

Loop Voltage Vc

Circuit

Heater Voltage

Load

Resistance

VH

RL

Heater

Resistance

RH

Heater

consumption

PH

Character

Sensing

Resistance

Rs

Sensitivity S

Slope

α

Tem. Humidity

Condition Standard test circuit

Preheat time

Ps=Vc2×Rs/(Rs+RL)2

MQ-3

Semiconductor

Bakelite (Black Bakelite)

Alcohol gas

0.04-4mg/l alcohol

≤24V DC

5.0V±0.2V AC or DC

Adjustable

31Ω±3Ω（Room Tem.）

≤900mW

2KΩ-20KΩ(in 0.4mg/l alcohol )

Rs(in air)/Rs(0.4mg/L

Alcohol)≥5

≤0.6(R300ppm/R100ppm Alcohol)

20℃±2℃；65%±5%RH

Vc:5.0V±0.1V；

VH: 5.0V±0.1V

Over 48 hours

Vc VRL

RL

VH

GND

The above is basic test circuit of the sensor.

The sensor need to be put 2 voltage,

heater voltage（VH）and test voltage（VC）.

VH used to supply certified working

temperature to the sensor, while VC used

to detect voltage (VRL) on load resistance

（RL）whom is in series with sensor. The

sensor has light polarity, Vc need DC

power. VC and VH could use same power

circuit with precondition to assure

performance of sensor. In order to make

the sensor with better performance,

suitable RL value is needed:

Power of Sensitivity body(Ps):

당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는

포괄적인 데이터시트를 제공합니다.