Product details
What is a Gas Sensor?
Gas sensors (also known as gas detectors) are electronic devices that detect and identify different types of gases. They are commonly used to detect toxic or explosive gases and measure gas concentration. Gas sensors are employed in factories and manufacturing facilities to identify gas leaks, and to detect smoke and carbon monoxide in homes.
Gas sensors vary widely in size (portable and fixed), range, and sensing ability. They are often part of a larger embedded system, such as a security system, and they are normally connected to an audible alarm or interface. Because gas sensors are constantly interacting with air and other gasses, they have to be calibrated more often than many other types of sensors.
MQ2 is one of the most commonly used gas sensors in the MQ sensor series. It is a Metal Oxide Semiconductor (MOS) type Gas Sensor also known as Chemiresistors as the detection is based upon a change of resistance of the sensing material when the Gas comes in contact with the material. Using a simple voltage divider network, concentrations of gas can be detected.
Here are some MQ series of gas sensors
- MQ-2 – Methane, Butane, LPG, smoke
- MQ-3 – Alcohol, Ethanol, smoke
- MQ-4 – Methane, CNG Gas
- MQ-5 – Natural gas, LPG
- MQ-6 – LPG, butane gas
- MQ-7 – Carbon Monoxide
- MQ-8 – Hydrogen Gas
- MQ-9 – Carbon Monoxide, flammable gasses
- MQ135 – Air Quality (CO, Ammonia, Benzene, Alcohol, smoke)
What is 1 ppm equal to?
When measuring gases like carbon dioxide, oxygen, or methane, the term concentration is used to describe the amount of gas by volume in the air. The 2 most common units of measurement are parts-per-million and percent concentration.
Parts-per-million (abbreviated ppm) is the ratio of one gas to another. For example, 1,000ppm of CO means that if you could count a million gas molecules, 1,000 of them would be carbon monoxide and 999,000 molecules would be some other gases.
Let’s get a short description and features of each gas sensor.
MQ-2 Gas Sensor
MQ-2 gas sensor 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, a measurement can be taken as soon as possible. The sensitivity of the sensor can be adjusted by the potentiometer.
MQ-2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module
Features
- Wide detecting scope
- Stable and long lifetime
- Fast response and High sensitivity
MQ-3 – Alcohol, Ethanol, Smoke
MQ-3 gas sensor module is useful for gas leakage detection (in home and industry). It is suitable for detecting Alcohol, Benzine, CH4, Hexane, LPG, and CO. 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 using the potentiometer.
MQ-3 Alcohol Detector Gas Sensor Module
Features
- High sensitivity to alcohol and small sensitivity to Benzine
- Stable and long life
- Fast response and High sensitivity
The output voltage from the Gas sensor increases when the concentration of gas increases. Sensitivity can be adjusted by varying the potentiometer. (Please note that the best preheat time for the sensor is above 24 hours.) For detailed information about the MQ-3 sensor, please refer to the datasheet provided.
MQ-4 – Methane, CNG Gas
As a natural gas sensor, the MQ-4 Natural Gas Sensor is a fast and reliable sensor with a high sensitivity to natural gas and methane, and also good sensitivity to propane and butane. This natural gas sensor has a long life and low cost and is widely used for gas leak detection. At the same time, two LED lights are used in the project to display the gas concentration:
Greenlight: it means the natural gas concentration is below the critical value.
Red light: Alert! The natural gas concentration has exceeded the critical value.
MQ-4 High Sensitivity Gas Methane (CNG) Detector Sensor Module
Features
- Good sensitivity to Combustible gas in a wide range.
- High sensitivity to CH4, Natural gas.
- Small sensitivity to alcohol, and smoke.
- Fast response Stable and long life.
- Simple drive circuit.
MQ-5 Sensor
MQ-5 gas sensor module is useful for gas leakage detection (in home and industry). It is suitable for detecting H2, LPG, CH4, CO, and Alcohol. 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 using the potentiometer.
MQ-5 Methane LPG Liquid Propane Gas Sensor Module
Features
- Supply Voltage: 5V
- Detecting concentration:200-10000ppm LPG, LNG, Natural gas, Iso-butane
- Analog and Digital Output
- Digital Out is High or Low based on an adjustable preset threshold.
MQ-6 – LPG, Butane Gas
This is a simple-to-use liquefied petroleum gas sensor, MQ-6 is suitable for sensing LPG (composed of mostly propane and butane) concentrations in the air. The MQ-6 can detect gas concentrations anywhere from 200 to 10000ppm.
This sensor has high sensitivity and fast response time. The sensor’s output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5V, add a load resistance, and connect the output to an ADC.
MQ-6 Liquefied Petroleum isobutane propane gas Sensor module
Features
- High Sensitivity to LPG, iso-butane, propane
- Small sensitivity to alcohol, smoke
- Detection Range: 100 – 10,000 ppm iso-butane propane
- Fast Response Time: <10s
- Simple drive circuit
- Heater Voltage: 5.0V
MQ-7 – Carbon Monoxide
The sensitive material of the MQ-7 gas sensor is SnO2, which with lower conductivity in clean air. It makes detection by method of cycle high and low temperature and detects CO when low temperature (heated by 1.5V). The sensor’s conductivity is higher along with the gas concentration rising. When the high temperature (heated by 5.0V), it cleans the other gases adsorbed under low temperatures. Please use a simple electro-circuit to convert the change of conductivity to the corresponding output signal of gas concentration. MQ-7 gas sensor has a high sensitivity to Carbon Monoxide. The sensor could be used to detect different gases containing CO, it is at low cost and suitable for different applications.
MQ-7 CO Carbon Monoxide Coal Gas Sensor Module
Features
- Good sensitivity to Combustible gas in a wide range
- High sensitivity to Natural gas
- Long life and low cost
- Simple drive circuit
MQ-8 – Hydrogen Gas
Hydrogen Gas sensor for measuring the concentration of Hydrogen (H2) in the air. Suitable for measuring concentrations from 100 to 10,000 ppm. Easy to implement heater drive and measuring circuit. This sensor is designed for a long life and stable output. Our MQ-8 Hydrogen Gas Sensor is ideal for use in a Gas Leakage Circuit for detecting gas leaks.
MQ-8 gas sensor
Features
- High Sensitivity (MQ-8 Sensor)
- Stable and Long Life
- Detection Range: 100 – 10,000 ppm H2 (Hydrogen)
- Heater Voltage: 5.0V
- Dimensions: 18mm Diameter, 17mm High excluding pins, Pins – 6mm High
MQ-9 – Carbon Monoxide, Flammable Gases
The MQ-9 Analog Gas Sensor has a high sensitivity to Carbon Monoxide, Methane, and LPG. The sensor that can be used to detect different gases containing the MQ-9 gas sensor is SnO2, which has lower conductivity in clean air. It makes detection by cycling high and low temperature and detects CO when low temperature (heated by 1.5V). The sensor’s conductivity is higher along with the gas concentration rising. When the temperature rises (heated by 5.0V), it detects Methane, Propane, combustible gas, etc, and cleans the other gases as it adsorbed under low temperatures. MQ-9 is usually applied in domestic gas leakage detectors, industrial gas detectors, portable gas detectors, etc.
MQ-9 Carbon Monoxide, Methane, and LPG Gas Sensor Module
Features
- Power supply: 5V
- Concentration: Good sensitivity to CO/Combustible gas
- High sensitivity to Methane, Propane, and CO
- Long life and low cost
- Standard Encapsulation: Bakelite
- Detection Gas: CO and combustible gas
- Loop Voltage: ≤10V DC
- Load Resistance: Adjustable
- Heater Resistance: 31Ω±3Ω(Room Tem.)
- Heater consumption: ≤350mW
MQ135 – Air Quality (CO, Ammonia, Benzene, Alcohol, Smoke)
Air quality sensors for detecting a wide range of gases, including NH3, NOx, alcohol, benzene, smoke, and CO2. Ideal for use in office or factory. MQ-135 gas sensor has a high sensitivity to Ammonia, Sulfide, and Benze steam, also sensitive to smoke and other harmful gases. It is at low cost and particularly suitable for Air quality monitoring applications.
MQ 135 Air Quality Detector Sensor
Features
- High Sensitivity
- High sensitivity to Ammonia, Sulfide, and Benze
- Stable and Long Life
- Detection Range: 10 – 300 ppm NH3, 10 – 1000 ppm Benzene, 10 – 300 Alcohol
- Heater Voltage: 5.0V
- Dimensions: 18mm Diameter, 17mm High excluding pins, Pins – 6mm High
- Long life and low cost
There are no reviews yet.