MQ303B is a tin dioxide semiconductor type alcoholgas sensor, With high sensitivity and rapid response to alcohol, suitable for portable alcohol detectors and automotive fire systems and so on.
Sensor characteristics
High sensitivity
Fast response recovery
Long life, low power consumption
Small size
main application
Thegas sensorCan be widely used in portable alcohol detectors and car ignition system
Technical indicators
| Product number |
MQ303B |
| product type |
Semiconductor gas sensor |
| Standard package |
Metal package |
| Detection of gas |
alcohol |
| Detection of concentration |
20-1000ppm alcohol |
| Standard circuit conditions |
Heating voltage |
V H |
0.9V ± 0.1V AC or DC |
| Circuit voltage |
VC |
≤ 6V DC |
| Load Resistance |
R L |
Adjustable |
| Heating resistance |
RH |
4.5W ± 0.5 W (room temperature) |
| Heating current |
IH |
120 ± 20mA |
| heating power |
PH |
≤ 140 mW |
| Characteristics of Gas Sensors under Standard Test Conditions |
Component power consumption |
PS |
≤ 10 mW |
| Sensitive body surface resistance |
RS |
4KΩ-400KΩ (in air) |
| Sensitivity |
S |
Rs (in air) / Rs (125 ppm alcohol) ≥3 |
| Concentration slope |
Α |
0.50 ± 0.15 (R300ppm/ R100ppmalcohol) |
| Standard test conditions |
temperature humidity |
20 ° ± 2 °;
65% ± 5% RH
|
| Standard test circuit |
Vc: 3.0 V ± 0.1 V DC;
VH: 0.9 V ± 0.1 V DC
|
| Warm up time |
Not less than 48 hours |
Note: Product parameters are subject to change without notice
