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MQ303A Schematic ( PDF Datasheet ) - ETC

Teilenummer MQ303A
Beschreibung Alcohol Sensor
Hersteller ETC
Logo ETC Logo 




Gesamt 3 Seiten
MQ303A Datasheet, Funktion
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)





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