Fermion MEMS Gas Detection Sensor Ammonia (NH3) - (Breakout, 1-300ppm) We're happy to introduce you to the Fermion MEMS Ammonia NH3 Gas Detection Sensor. This sensor is great for keeping track of ammonia levels in different places. It’s small, measuring just 13 x 13 x 2.5mm, so it fits easily into your systems. It uses very little power—less than 20mA—helping you save on energy costs. Plus, it heats up quickly and gives fast readings, so you can rely on it when you need to check the air. You can use this sensor to find ammonia leaks in cold storage, manage risks in fish farming, or monitor odors in bathrooms. If you’re looking for a reliable way to ensure safety and keep the air fresh, the Fermion MEMS NH3 Sensor is a perfect choice.  Precautions for Use: Do not forget to remove the protective film before using the sensor. Keep the sensor away from silicone adhesives and hair gel. Try to keep the sensor free from harsh substances such as alkalis and halogens. Avoid exposing the sensor to high levels of harmful gases like H2S, SOX, Cl2, or HCl. Do not expose the sensor to very high temperatures, humidity, or pollution for extended periods of time. Keep the sensor away from water, humidity, and freezing temperatures. Be cautious with the sensor and avoid shaking, dropping, or striking it. If you haven't used the sensor in a while, do a 24-hour warmup.Please don’t use this sensor in situations where safety is a major concern. Wiring Diagram of Fermion MEMS NH3 Sensor and Arduino UNO: Package Includes: 1 x Fermion MEMS Gas Detection Sensor Ammonia (NH3) 1 x 2.54mm pitch header pin Specifications: Specification Details Gas Detected Ammonia (NH3) Detection Range 1-300 ppm Operating Voltage 3.3-5 V Operating Current 20 mA Output Signal Analog voltage Sensitivity R0 (in air) / Rs (in 50 ppm NH3) ≥ 3 Operating Temperature -10 to 50 °C Operating Humidity 15-90% RH (non-condensing) Lifespan ≥ 5 years (in air) Dimensions 13 × 13 × 2.5 mm (0.51 × 0.51 × 0.1 in)

MQ-135 gas sensor Module The MQ-135 gas sensor module is a device that is used for sensing a range of gases, including ammonia (NH3), sulfur dioxide (SO2), and carbon monoxide (CO). It is based on a metal oxide semiconductor (MOS) gas sensor, which uses a semiconductor material to detect gases. The MQ series of gas sensors utilize a small heater inside with an electrochemical sensor these sensors are sensitive to a range of gasses are used at room temperature. MQ 135 alcohol sensor is a Sno2 with a lower conductivity of clean air. When the target explosive gas exists, then the sensor's conductivity increases more increasing more along with the gas concentration rising levels. By using simple electronic circuits it converts the charge of conductivity to a corresponding output signal of gas concentration The MQ135 gas sensor has high sensitivity for ammonia, sulfide, benzene steam, smoke, and other harm full gas. It is low cost and suitable for different applications. The MQ135 Gas Sensor Module is a high-quality, reliable tool for monitoring air quality. The module's unique design makes it ideal for use in both industrial and commercial applications that require accurate readings of various gases. It uses an advanced sensing element to detect the presence of dangerous combustible gasses such as carbon monoxide (CO), hydrogen sulfide (H2S) and nitrogen dioxide (NO2). This sensor has been tested against strict industry standards which guarantees its accuracy and reliability when measuring levels of toxic substances in different environments. Its highly sensitive sensors are capable of detecting concentrations even at lower threshold values than other comparable gas sensors on the market today. Additionally, this easy-to-install device offers greater durability due to its robust casing construction making it suitable for indoor or outdoor operation conditions without compromising performance or efficiency during extended operating periods over time. Whether you're looking to improve safety around your workplace or monitor air pollution levels within a home environment ––the MQ 135 Gas Sensor Module can provide reliable data quickly with minimal effort required by users from setup through utilization stages alike - giving peace-of-mind assurance! Robocrage has the best technology, guaranteed quality, and always puts you first. Our products are top-notch but affordable, and our team is here to help you every step of the way. Join us and experience the difference! Iotcart offers the best MQ135 gas sensor price. Upgrade your environment today with Robocrage's MQ 135 Air Quality Sensor! Breathe better, live better. Buy MQ135 now! Check out the entire range of Gas Sensors. MQ-135 Gas Sensor Applications: Air quality monitor Detection of harmful gases Domestic air pollution detection Industrial pollution detection Portable air pollution detection  Read our blog MQ sensor where we explained what is a gas sensor, what is 1ppm equal to, MQ sensor list of different series and their features. Technical Features of the MQ135 gas sensor: This gas sensor works between 2.5V to 5.0V. Uses around 150mA of current while running. It can detect gases like NH3, NOx, CO2, alcohol, benzene, and smoke. When powered at 5V, it gives out a digital signal from 0V to 5V in TTL logic. it also provides an analog output in the same voltage range. Typically, it operates at 5V. MQ135 Gas Sensor Working Principle: The MQ 135 gas sensor operates on the principle of detecting gases through the conductivity of its steel exoskeleton which holds a sensing element. By heating this sensing element, its sensitivity to gas molecules is enhanced. When gas molecules come into contact with the material, they alter its electrical conductivity, leading to a change in resistance. This variation in resistance correlates directly with the concentration of the target gas present in the surrounding environment. MQ135 Gas Sensor Pin Diagram: MQ135 Pinout For Module: Vcc: This supplies power to the sensor, typically at a voltage of +5V. Ground: It is used to connect the module to the system ground. Digital Out: This pin can be utilized to obtain digital output by setting a threshold value using the potentiometer. Analog Out: Outputs an analog voltage ranging from 0 to 5V, proportional to the gas intensity. MQ135 Pinout For Sensor: H-Pins: One of the two H pins connects to the power supply, while the other connects to the ground. A-Pins: Both A and B pins can be interchanged and are connected to the supply voltage. B-Pins: A and B pins are interchangeable. One pin serves as an output, while the other is pulled to the ground. Package Includes: 1 x MQ-135 gas sensor Module MQ-135 Gas Sensor Specifications: Model  MQ135 Gas Sensor Module  Operating Voltage 5V (DC) Detecting Range 10ppm to 1000ppm Dimensions  3 x 2 x 1 cms Weight  5 grams

Fermion MEMS Gas Detection Sensor Hydrogen Sulfide (H2S) - Breakout, 0.5-50ppm Hi there! we want to tell you about the Fermion MEMS Hydrogen Sulfide H2S Gas Detection Sensor. This sensor is great for detecting hydrogen sulfide gas in places like toilets, sewers, and garbage stations. It’s small, measuring just 13 x 13 x 2.5mm, and uses very little power—less than 20mA—so it’s energy-efficient. It also runs cool, heats up quickly, and gives fast readings, making it reliable for real-time monitoring. This sensor is part of a larger family of gas sensors, which means you can customize it to fit your specific needs. If you need a dependable way to detect hydrogen sulfide, the Fermion MEMS H2S Sensor is a fantastic choice. Let’s see how it can work for you! Precautions for Use Before using the sensor, the protective film should always be removed. The sensor should not be near hair gel, silicone adhesives, or locations where silicon smells are present. Avoid subjecting the sensor to elevated concentrations of toxic gases such as H2S, SOX, Cl2, or HCl. Avoid making contact with strong chemicals like alkalis and halogens. The sensor should not be used for a long duration of time in hot, humid, or polluted environments. Keep the sensor out of the water, the humidity, and the freezing cold. Take caution when handling the sensor to avoid excessive shaking or falling. Avoid using this sensor in situations where safety is a concern. If the sensor has not been used for a long time, preheat it for at least 24 hours before use. Wiring Diagram of Fermion MEMS H2S Gas Sensor and Arduino UNO  Application Detects hydrogen sulfide and benzene in the air. Ensures safety in factories and industrial sites. Monitors gas emissions in landfills and treatment facilities. Used in sewage plants for safe working conditions. Monitors gas levels in storage areas for produce safety. Used in gas detectors and alarms or residential safety. Monitors exhaust gases in vehicles. Ensures safe indoor air quality in heating and cooling systems. Package Includes: 1 x Fermion MEMS Gas Detection Sensor Hydrogen Sulfide (H2S). 1 x 2.54mm pitch header pin. Specifications: Specification Details Gas Detected Hydrogen Sulfide (H2S), Benzene Detection Range 0.5-50 ppm Operating Voltage 3.3-5 V Operating Current 20 mA Output Signal Analog voltage Sensitivity R0 (in air) / Rs (in 50 ppm H2S) ≥ 3 Operating Temperature -10 to 50 °C Operating Humidity 15-90% RH (non-condensing) Lifespan ≥ 5 years (in air) Dimensions 13 × 13 × 2.5 mm (0.51 × 0.51 × 0.1 in)

Fermion MEMS Formaldehyde HCHO Gas Detection Sensor - (Breakout, 0-3ppm) With great pleasure, we're presenting to you the Fermion MEMS Formaldehyde HCHO Gas Detection Sensor. This sensor is a fantastic choice if you need an accurate way to measure formaldehyde levels. It uses advanced MEMS technology, making it small and easy to fit into different devices. Measuring just 13x13x2.5mm, it uses very little power—less than 20mA—so it won’t waste energy. It also runs cool and responds quickly, making it perfect for air purifiers, HVAC systems, and even smart wearables. What’s more, this sensor is part of a larger series that includes sensors for the other 11 different types of gas sensors (HCHO, CO, CH4, VOC, NH3, H2S, EtOH, Smoke, Odor, H2, NO2). Whether you want to improve air quality or ensure safety, the Fermion MEMS Formaldehyde Sensor is accurate and dependable. Let’s see how it can work for you! Precautions for Use: Take off the protective film before using the sensor. Avoid silicone-containing goods such as adhesives, hair gels, and other sources of silicon vapors. Avoid exposing the sensor to high concentrations of hazardous gases such as H2S, SOX, Cl2, or HCl. Keep it free from caustic substances such as alkalis and halogens. Do not use for a long period of time in hot, muggy, or polluted conditions. The sensor should not be exposed to water, moisture, or extremely cold temperatures. Take caution when handling to prevent shaking or falling. Use of this sensor should be avoided in situations where safety is a concern. The sensor has to be warmed for at least 24 hours before use if it hasn't been used in a while. Wiring Diagram of Fermion MEMS HCHO Gas Sensor and Arduino UNO: Package Includes: 1 x Fermion MEMS Formaldehyde HCHO Gas Detection Sensor 1 x 2.54mm pitch header pin Specifications: Specification Details Gas Detected HCHO (Formaldehyde) Detection Range 0-3 ppm Operating Voltage 3.3-5 V Operating Current < 20 mA Output Signal Analog voltage Sensitivity R0 (in air) / Rs (in 0.4 ppm HCHO) ≥ 1.8 Operating Temperature -10 to 50 °C Operating Humidity 15-90% RH (non-condensing) Lifespan ≥ 3 years (in air) Dimensions 13 × 13 × 2.5 mm (0.51 × 0.51 × 0.1 in)

MQ-2 Gas Sensor Module  The MQ-2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module is useful for gas leakage detection (home and industry). It is suitable for detecting H2, LPG, CH4, CO, Alcohol, Smoke, or Propane. Due to its high sensitivity and fast response time, measurements can be taken as soon as possible. The sensitivity of the sensor can be adjusted by the potentiometer This MQ-2 Smoke and gas detector module works with 5V power, making it easy to connect to most projects. You can get two types of readings from it—an analog output, which gives you a range of values (0V to 5V) based on the gas level, or a digital output that’s either on (5V) or off (0V).  Check out the entire range of Gas Sensors. Applications: Safety of home Control of air quality Measurement of gas level Package Includes: 1 x MQ2 Gas Sensor Module MQ2 Gas Sensor Specifications Model  MQ2 Gas Sensor  Operating Voltage  5V (DC) Analog Output Voltage 0V to 5V Digital Output Voltage 0V or 5V (TTL Logic) Dimensions  3.6 x 2 x 1 cms Weight  5 grams

MQ-4 Natural Gas sensor The MQ-4 gas sensor is a device that is used to detect the presence of methane gas in the air. It is often used in applications such as natural gas leak detection, indoor air quality monitoring, and the oil and gas industry. The MQ-4 sensor is a type of metal oxide semiconductor (MOS) gas sensor. It works by measuring the conductivity of the air, which changes when the sensor is exposed to methane gas. The sensor has a high sensitivity to methane, making it well-suited for detecting low levels of gas. To use the MQ-4 sensor, it must be connected to a microcontroller or other control device. The sensor outputs an analogue signal that can be read by the microcontroller, which can then be used to trigger an alarm or other response when the concentration of methane gas reaches a certain level. The MQ-4 sensor is relatively simple to use and is widely available, making it a popular choice for gas detection applications. However, it is important to note that the sensor may not be able to detect other types of gases, and it may require regular calibration to ensure accurate readings. If you want to use this MQ-4 Gas Sensor with Arduino, for that you will need  Arduino jumper wires buzzer or siren

MQ-7 Gas Sensor Module The MQ-7 gas sensor module is a device that can detect the presence of carbon monoxide (CO) gas in the air. It is commonly used in applications such as gas leak detectors, safety devices, and industrial control systems. The MQ-7 sensor operates by using a chemical reaction between the CO gas and a conductive metal oxide to produce a current. The magnitude of the current is proportional to the concentration of CO gas in the air. The gas sensor can be used to detect CO gas concentrations in the range of 20-2000 ppm. It is important to note that CO is a poisonous gas that can be dangerous at high concentrations. It is recommended to use the MQ-7 sensor with caution and to take appropriate safety measures when working with it. This module provides both digital and analog outputs. The threshold level for digital output can be easily adjusted using the preset on the board. The MQ-7 sensor module can be easily interfaced with microcontrollers, Arduino and etc. Read our blog MQ sensor where we explained what is a gas sensor, what is 1ppm equal to, MQ sensor list of different series and their features. Applications: Domestic gas leakage detector Industrial CO detector Portable gas detector Standard Test Conditions of MQ7 Gas Sensor Temperature: 20°C ± 2°C Humidity: 65% ± 5% RH Standard Test Circuit: Vc: 5.0V ± 0.1V; Vh(high):5.0V±0.1V Vh(low): 1.5V±0.1V  Package Includes: 1 x MQ7 Carbon Monoxide Gas Sensor Gas Sensor Specifications Model  MQ7 Gas Sensibility  Carbon Monoxide Operating voltage 5V (DC) Range 10 ~ 1000 ppm Return time ≤ 30 sec Heating resistance ± 31 Ω Sensitivity ≥ 3%. Charachteristic Gas  100 ppm CO Dimension  3.5 x 2 x 1.1cms  Weight  5 grams

Fermion: MEMS Hydrogen H2 Gas Detection Sensor The Fermion MEMS H2 Hydrogen Gas Detection Sensor is the perfect air quality and industrial safety monitoring solution. It features high sensitivity, versatile applications, a state-of-the-art design, a robust build, user friendliness, fast response, and energy efficiency. Made with advanced MEMS technology, the sensor ensures the highest quality and durability. Its compact design measures 13x13x2.5mm, making it suitable for indoor and outdoor monitoring.  The low power consumption and minimal heat generation guarantee an environmentally friendly and cost-effective solution. Easy to use and maintain, this sensor is designed to effectively solve hydrogen gas detection issues, providing rapid response and recovery times. It is perfect for professionals in need of reliable gas detection solutions. Precautions for use Kindly remove the protective film before usage. To prevent exposure to volatile silicon compounds vapours (such as silicone adhesive, hair gel, silicone rubber, or other locations where volatile silicon compounds are present). Avoid exposure to high concentrations of corrosive gases (such as H2S, SOX, Cl2, HCl, etc.). Prevent contamination from alkalis, alkali metal salts, and halogens. Refrain from prolonged exposure to extreme environments (such as high temperatures, high humidity, and high pollution). Avoid contact with water, condensation, and freezing. Minimize excessive vibration, impact, and dropping. Please refrain from employing this module in systems that involve personal safety concerns. For extended non-usage periods, preheating the module for at least 24 hours is advisable.

MQ-136 Hydrogen Gas Sensor For Hydrogen Sulfide Detector Module MQ136 Gas Sensor can be used to monitor the concentration of Hydrogen Sulfide gas. This Module simplifies using the MQ-136 gas sensor by providing digital as well as analog output which can be interfaced with Microcontrollers, Arduino, and Raspberry pi. The sensitive material of the MQ136 gas sensor is SnO2, which with lower conductivity in clean air. When the target Hydrogen sulfide gas exists, the sensor’s conductivity is higher along with the Hydrogen sulfide concentration rising. Please use a simple electric circuit, Convert the change of conductivity to the corresponding output signal of gas concentration. MQ136 gas sensor has a high sensitivity to Hydrogen sulfide, Low sensitivity to other combustible gas. It is at a low cost and suitable for different applications. Applications: Domestic Hydrogen sulfide detector Industrial Hydrogen sulfide detector Portable Hydrogen sulfide detector Gas leak monitoring device suitable for home or factory, suitable for liquefied gas, butane, propane, methane, alcohol, hydrogen, smoke, and other monitoring devices. Package Includes: 1 X MQ-136 Hydrogen Gas Sensor MQ136 Gas Sensor Specifications Model  MQ136 Gas Sensor Operating Voltage 5V (DC) Dimensions  3 x 2 x 1cms Weight  5 grams

MQ-2 NH3 Gas Sensor Module The MQ-2 gas sensor is a device that can detect a variety of gases, including flammable gases such as propane and methane, as well as smoke. It is commonly used in applications such as gas leak detectors, safety devices, and industrial control systems. The MQ-2 sensor operates by using a chemical reaction between the target gas and conductive metal oxide to produce a current. The magnitude of the current is proportional to the concentration of the target gas in the air. The gas sensor can be used to detect a wide range of gas concentrations, depending on the specific type of gas being detected. It is important to note that the MQ-2 sensor is not selective for specific gas and may be triggered by other gases as well. It is recommended to use the MQ-2 sensor with caution and to take appropriate safety measures when working with it. Applications: Detect or measure Gases like H2, LPG, CH4, CO, Smoke or Propane Air quality monitor Gas leak alarm Safety standard maintenance Maintaining environmental standards  in hospitals  Package Includes: 1 x MQ-2 NH3 Gas Sensor Module Specifications Main chip LM393 Gas Sensitivity  H2, LPG, CH4, CO, Smoke or Propane Working voltage DC 5V concentration range 10 to 300ppm Dimensions  32mm X22mm X30mm Weight  10 grams

MG811 Carbon Dioxide Sensor MG-811 Carbon Dioxide Sensor Module (Carbon dioxide sensor) is a carbon dioxide sensor (CO2) sensor that is a Metal Oxide Sensor sensor, which must heat the tank to the specified level. (With the method of supplying power) will cause heat vapor and separate CO2 from the air.  This sensor module has an MG-811 onboard as the sensor component. A signal output circuit for heating the sensor The MG-811 is highly sensitive to CO2 and less sensitive to alcohol and CO. The output voltage of the CO2 increases. Useful for greenhouses and medical projects.  Sends an analog signal that decreases as the concentration of CO2 increases. This module also includes a digital output pin with TTL output. The Potentiometer on board is used to set the Digital Output Setpoint.  After setting the potentiometer threshold, once that threshold is reached, an LED on the sensor will illuminate and the digital pin will give a HIGH voltage signal.

MQ-5 Gas Sensor Module The Simple MQ-5 Gas Sensor Module is an inexpensive way to add basic gas sensing to your project. A Buzzer is used by the MQ-5 Methane LPG Liquid Propane Gas Sensor Module particulate sensor to detect any detected material that is even present in the air!This MQ-5 Methane LPG Liquid Propane Gas Sensor Module is widely used in gas leak detection pieces of equipment in the home and industry, and is suitable for detecting LPG, natural gas, town gas, as well as avoiding the noise of alcohol and cooking fumes and cigarette smoke. The MQ5 (MQ-5) sensor is used in gas leakage detection equipment in consumer and industrial applications. It can detect LPG, natural gas, and coal gas. Avoid alcohol noise, cooking fumes, and cigarette smoke. The potentiometer can be used to adjust the sensitivity.The MQ-5 gas sensor's sensitive material is tin Oxide (SnO2), which has a lower conductivity in clean air. When the target combustible gas is present, the sensor's conductivity increases as the gas concentration rises. Please use a simple electro circuit to convert the change in conductivity to the corresponding gas concentration output signal. The MQ-5 gas sensor has a high sensitivity to methane, propane, and butane and can detect both methane and propane. The sensor could be used to detect various combustible gases, particularly methane; it is low-cost and suitable for a variety of applications. If you want to use this MQ-5 Gas Sensor Module with Arduino, for that you will need  Arduino jumper wires buzzer or siren Read our blog explaining the classification of sensors in IoT detailing 5 core classifications depending on how they work, 10 types of sensors, and the Characteristics of Sensors in IoT.   MQ-5 Gas Sensor Module Pin Diagram MQ-5 Gas Sensor Module Pin Description 1 AO Analog output (Sensor data output in analog form) 2 DO Digital output (Sensor data output in digital form) 3 GND To -ve of power supply 4 VCC To +ve of power supply Applications: Detecting LPG Detecting natural gas Detecting coal gas Detecting alcohol Detecting cooking fumes Detecting cigarette smoke Package Includes: 1 x MQ-5 Gas Sensor Module Specifications: Gas Sensor Model  MQ5 Operating Voltage  5V (DC) Operating Temperature -20 to 40 (°C) Dimensions  3.2 x 2 x 2.2cms  Weight  5 grams

MQ-137 NH3 Gas Sensor Module The MQ137 sensor is a gas sensor module specially designed to detect and sense gases like ammonia (NH3) and carbon monoxide (CO). The MQ-137 gas sensor module is a device that can detect the presence of ammonia (NH3) gas in the air. It is commonly used in applications such as air quality monitors, industrial control systems, and agricultural environments. The MQ-137 sensor operates by using a chemical reaction between the ammonia gas and conductive metal oxide to produce a current. The magnitude of the current is proportional to the concentration of ammonia gas in the air. The sensor can be used to detect ammonia gas concentrations in the range of 0-1000 ppm. Ammonia is a toxic gas that can be harmful to humans at high concentrations. It is recommended to use the MQ-137 sensor with caution and to take appropriate safety measures when working with it. Applications: Detect or measure Gases like NH3 or CO Air quality monitor Gas leak alarm Safety standard maintenance Maintaining environmental standards  in hospitals  Package Includes: 1 x MQ-137 NH3 Gas Sensor Module Specifications Main chip LM393 Gas Sensitivity  Ammonia (NH3) and Carbon Monodioxide (CO) Working voltage DC 5V concentration range 10 to 300ppm Dimensions  32mm X22mm X30mm Weight  10 grams

MQ-8 Gas Sensor Module The MQ-8 gas sensor module is a device that can detect the presence of hydrogen gas in the air. It is commonly used in applications such as gas leak detectors, safety devices, and industrial control systems. The MQ-8 sensor operates by using a chemical reaction between the hydrogen gas and a conductive metal oxide to produce a current. The magnitude of the current is proportional to the concentration of hydrogen gas in the air. The sensor can be used to detect hydrogen gas concentrations in the range of 100-10000 ppm. Using a simple circuit to convert the change in conductivity of the gas concentration corresponding to the output signal. MQ-8 hydrogen gas sensor of high sensitivity, the monitoring of the other hydrogen-containing gas is also very satisfactory.This sensor can detect a wide range of hydrogen gas, city gas, in particular, is a low-cost sensor for a variety of applications. Suitable for home or industrial hydrogen leakage monitoring devices. Can not interfere with ethanol vapor, soot, carbon monoxide, and other gases. Applications: Detect leakages in the industry Used in mines Can be used in refrigerators and AC Package Includes: 1 x MQ8 Gas Sensor Module Gas Sensor Specifications Model  MQ8 Gas Sensor  Operating Voltage 5V (DC) Current Consumption 150 mA Do output TTL digital 0 and 1 ( 0.1 and 5V) Ao output 0.1-0 .3 V (Relative to Pollution ) Dimensions  3.2 x 2.1 x 2.1cms Weight  5 grams

MQ131 Ozone Gas Detection Module The MQ131 gas sensor module is a device that can detect the presence of ozone gas (O3) in the air. It is commonly used in applications such as air quality monitors and industrial control systems. The MQ131 sensor operates by using a chemical reaction between the ozone gas and a conductive metal oxide to produce a current. The magnitude of the current is proportional to the concentration of ozone gas in the air. The sensor can be used to detect ozone gas concentrations in the range of 0.05-10 ppm. Ozone is a toxic gas that can be harmful to humans at high concentrations. It is recommended to use the MQ131 sensor with caution and to take appropriate safety measures when working with it. The sensitive material of the MQ131 gas sensor is O3 SnO2, which with lower conductivity in clean air. When Ozone gas exists. The sensor’s conductivity is higher along with the gas concentration rising. Please use a simple electro circuit, Convert the change of conductivity to corresponding output signal of gas concentration. MQ131 gas sensor has a high sensitivity to Ozone, also sensitive to O3 CL2, NO2, etc.