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[(350686)MQ136][(350850)MQ138][(350852)MQ139][(350853)MG811][(10)TGS813]
MQ136 MQ138 MQ139 MG811 TGS813 Detection Hydrogen Sulfide Formaldehyde Freon Carbon Dioxide Combustible Gas Sensor Module
Features:
1. Long service life and fast response.
2. Wide application and compact appearance.
3. With mounting holes for easy permanent installation.
MQ136 Hydrogen Sulfide Sensor
Explanation:
It has low conductivity in clean air. When the target hydrogen sulfide gas is present, the conductivity of the sensor increases with increasing hydrogen sulfide concentration. Please use a simple circuit to convert the change in conductivity to the corresponding gas concentration output signal.
The MQ136 gas sensor has high sensitivity to hydrogen sulfide and low sensitivity to other combustible gases. It is low cost and suitable for different applications.
MQ138 Formaldehyde Sensor
Explanation:
With the MQ138 gas sensor and circuit, it is easy to plug and use, just connect the power supply and the module can be connected with the microcontroller.
Working voltage: DC 5V
Size: 35mm x 21mm x 28mm
Onboard power and digital signal LED indicators
Main chip: LM393, formaldehyde sensing probe
2-channel signal output (analog output, TTL level output)
TTL output valid signal is low level; (low output signal light, can be connected to the IO port of the microcontroller)
The analog output increases with the concentration, the higher the voltage, the higher the concentration, the higher the sensitivity of aldehydes, alcohols, ketones, and aromatic compounds.
MQ139 Freon Sensor
Features:
1. With signal output indicator light.
2. Quick response recovery feature.
3. It has long service life and reliable stability.
4. Dual signal output (analog output and TTL level output).
5. With mounting holes, it is convenient for fixed installation.
6. The probe can be plugged and unplugged, which is convenient for testing.
7. It has high sensitivity to ozone gas (detection concentration range is 10-1000ppm).
8. The analog output increases with the concentration, the higher the concentration, the higher the voltage.
9. The TTL output effective signal is low level; (the signal light is on when the output is low, and it can be connected to the IO port of the single-chip microcomputer).
Specification:
Working voltage: DC 5V
Size: 35mm X21mm X28mm
MG811 CO2 Sensor Module
Explanation:
1. MG-811 is highly sensitive to CO2 and less sensitive to alcohol and CO.
2. This MG811 sensor module is a bit special in that it requires 6VDC to function properly.
3. This sensor module features an onboard MG-811 gas sensor and circuitry, ready to use out of the box.
4. There is an onboard signal conditioning circuit for amplifying the output signal and an onboard heating circuit for heating the sensor.
5. Can be used for air quality control, fermentation process, indoor air monitoring applications. The output voltage of the module decreases as the CO2 concentration increases.
Specification:
Analog output: 0¢¦2V
Operating voltage must be 6VDC
Size: 35mm x 21mm x 28mm (LxWxH)
Microcontrollers such as Ad can be connected
Equipped with MG811 carbon dioxide CO2 gas sensor
Dual signal output: analog output, TTL digital level output
The onboard LED is active low, when the digital TTL output valid signal is low, the LED is activated.
TGS813 Detects Combustible Gas
Features:
1. Quick response recovery function.
2. There are screw holes for easy positioning.
3. The analog output voltage varies with concentration.
4. With power indicator and TTL signal output indicator.
5. With DO (TTL) switch signal output and AO analog signal output.
6. High and low level TTL output. (It can be directly connected to the microcontroller or the relay module).
Specification:
AO output: analog level signal
DO output: TTL digital 0 and 1 (0.1 and 5 V)
Input voltage: DC5V Power consumption (current): 150mA
Note:
After the sensor is powered on, it needs to be preheated for about 20S, and the measurement data will be stable. It is normal for the sensor to heat up, because there is a heating wire inside, it is not normal to heat up.
Instruction:
1.VCC: connect to the positive pole of the power supply (5V)
2..GND: connect to the negative pole of the power supply
3.DO: TTL switch signal output
4. AO: Analog signal output