Alcohol Sensor - ETC
Description
MQ303A Alcohol Sensor
Character * High sensitivity * Fast response and resume * Long life and low cost * Mini Size
Application MQ303A is semiconductor sensor is for Alcohol detection, It has good sensitivity and fast response to alcohol, suitable for portable alcohol detector.
Configuration Technical Data
Model No.
MQ303A
Sensor Type
Semiconductor
Standard Encapsulation
Metal
Detection Gas
Alcohol
Concentration
20-1000ppm Alcohol
Heater Voltage V H Loop Voltage Vc
0.
9V ± 0.
1V AC or DC ≤6V DC
Standard Circuit
Conditions
Load
RL
Resistance
Heater Resistance
RH
Adjustable 4.
5Ω ± 0.
5 Ω（Room Tem.
）
Heater Current Heater Power
Sensor Consumption
IH PH
PS
120±20mA ≤ 140 mW
≤10 mW
Character
Sensing Resistance
Rs
4KΩ-400KΩ(in air)
Sensitivity S
Rs(in air)/Rs(125ppm Alcohol)≥3
Slope
α 0.
50 ± 0.
15(R300ppm/R100ppm Alcohol)
Tem.
Humidity
20℃±2℃；65%±5%RH
Condition Standard test circuit
Vc:3.
0 V±0.
1 V DC ； VH: 0.
9 V±0.
1 V DC
Preheat time
Over 48 hours
Sensing element of the semiconductor sensor is a micro-ball, heater and metal electrode are inside, and the sensing element is installed in anti-explosion double 100 mesh metal case (see the above)
Sensitivity Characteristics
Influence of Temperature/Humidity
Fig.
2 is the test circuit.
You could get resistance change from voltage change on fixed or adjustable load resistance.
Normally, it will take several minutes preheating for sensor enter into stable working after electrified; oryou could give 2.
2±0.
2V high voltage for 5-10secs before test, which make sensor easily stable.
Fig 3 is sensitivy of MQ303A, it reflects relations between resistance and gas concentration, resistance of the sensor reduce when gas concentration increases
Notification
1 Following conditions must be prohibited 1.
1 Exposed to organic silicon steam
Organic silicon steam cause sensors invalid, sensors must be avoid exposing to silicon bond, fixature, silicon latex, putty or plastic contain silicon environment
1.
2 High Co...
Similar Datasheet
