MQ-131:
1: Wide range of applications
2: Quick response recovery feature
3: Dual signal output (analog output, TTL level output)
4: long life
5: LED indicator with signal output
The MQ131 ozone gas sensor module is a compact board based on the MQ-131 sensor. It is equipped with a very wide range of ozone sensitivity, capable of detecting ozone concentrations up to (10-1000ppb) in ambient air. Tin dioxide (SnO2) is the sensor's sensitive material, has low conductivity (high resistance) in clean air environments, and responds very well in the presence of ozone. As a result, the sensor is very sensitive in the presence of ozone. The higher the ozone concentration, the better the conductivity. The board has a trimmer to set thresholds, status LEDs for analog and digital outputs (TTL), power and output signals. The digital outputs can be connected directly to a microcontroller. The voltage provided by the analog output (0-5 VDC) increases as the ozone concentration in the air increases.
Features:
Wide range with good sensitivity to ozone (detection concentration range: low concentration probe 10PPB-1000PPB; high concentration probe 10ppm-1000ppm)
This is a low concentration (black glue wood version)
Dual signal output (analog output, TTL level output);
The valid signal of TTL output is low level; (the light is on when the output is low, and it can be connected to the IO port of the microcontroller)
The analog voltage decreases with increasing concentration, the higher the concentration, the lower the voltage
Quick response recovery feature
Highly sensitive to ozone
Long life and low cost
LED indicator with signal output
Product size (mm): 30(L) x 20(W) x 28(H)
Weight: 10 grams
The following situations must be avoided:
Water Condensation In room conditions, slight water condensation can slightly affect sensor performance. However, if water accumulates on the sensor surface and remains for a certain period of time, the sensitivity of the sensor will decrease.
For high gas concentrations. Regardless of whether the sensor is powered or not, if it is placed in a high concentration of gas for a long time, it will affect the sensor characteristics.
Long-term exposure to harsh environments. Regardless of whether the sensor is powered on or not, if it is exposed to unfavorable environments such as high humidity, high temperature, and high pollution for a long time, it will seriously affect the performance of the sensor.
Vibration continues. Vibration causes the sensor to direct the response downward, and then repeat. On shipping or assembly lines, pneumatic screwdrivers/ultrasonic welders can cause this vibration.
concussion. If the sensor is subjected to strong shock, its leads may be disconnected.
Packing list:
1 x MQ131 Ozone Gas Sensor Module
MQ-136:
1: Wide range of applications
2: Simple drive circuit
3: Good sensitivity to hydrogen sulfide
4: Small size
5: Simple to use
Product Description
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.
MQ-138:
1: Wide range of applications
2: Small appearance
3: Long service life
4: Fast response time
5: With mounting holes for easy permanent installation
The module comes with MQ138 gas sensor and circuit, easy to plug and use, just connect the power supply and the module can be connected with the microcontroller.
Working voltage: DC 5V
Onboard power and digital signal LED indicators
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
Has long life and reliable stability
Quick response feature
With mounting holes for permanent installation
Main chip: LM393, formaldehyde sensing probe
Dimensions: 35mm x 21mm x 28mm
Weight: 11 grams
MQ-139
1: Wide range of applications
2: With signal output indicator light
3: With mounting holes for easy fixed installation
4: High sensitivity
5: Long service life
1. Dimensions: 35mm X21mm X28mm length X width X height
2. Working voltage: DC 5V
Features:
1. With signal output indicator light;
2. Dual signal output (analog output and TTL level output);
3. The TTL output valid signal is low level; (the signal light is on when the output low level, can be connected to the IO port of the microcontroller)
4. The analog output increases with the concentration, the higher the concentration, the higher the voltage;
High sensitivity to ozone gas (detection concentration range 10-1000ppm)
6. It has a long service life and reliable stability;
7. Quick response and recovery features;
8. With mounting holes, it is convenient for fixed installation;
9. The probe can be plugged and unplugged, which is convenient for testing.
MG811:
1: Wide range of applications
2: high sensitivity
3: Simple to use
4: Long service life
5: Dual signal output: analog output, TTL digital level output
This sensor module features an onboard MG-811 gas sensor and circuitry, ready to use out of the box.
This MG811 sensor module is a bit special in that it requires 6VDC to function properly.
There is an onboard signal conditioning circuit for amplifying the output signal and an onboard heating circuit for heating the sensor.
MG-811 is highly sensitive to CO2 and less sensitive to alcohol and CO.
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.
Feature:
Equipped with MG811 carbon dioxide CO2 gas sensor
Operating voltage must be 6VDC
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.
Microcontrollers such as Ad can be connected
Analog output: 0～2V
Dimensions: 35mm x 21mm x 28mm (LxWxH)
Weight : 11g
TGS813:
1: Wide range of applications
2: With fixing holes, easy to install
3: Strong stability
4: Small size
5: Long service life
Feature
1. With power indicator and TTL signal output indicator;
2. With DO (TTL) switch signal output and AO analog signal output;
3. High and low level TTL output. (Can be directly connected to the microcontroller or relay module)
4. The analog output voltage varies with concentration.
5. There are screw holes for easy positioning;
6. Long service life and reliable stability
7. Quick response recovery function
Electrical properties
Input voltage: DC5V Power consumption (current): 150mA
DO output: TTL digital 0 and 1 (0.1 and 5 V)
AO output: analog level signal
Special reminder: 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.
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
5. With fixing holes, easy to install
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