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Gas Sensor
Sensors
MQ-7 Gas Sensor Module
MQ-7 CO Carbon Monoxide Coal Gas Sensor Module detects the concentrations of CO in the air and outputs its reading as an analog voltage. The sensor can measure concentrations of 10 to 10,000 ppm. The sensor can operate at temperatures from -10 to 50°C and consumes less than 150 mA at 5 V.
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.
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 |
Frequently Asked Questions
1. What are gas sensors? How do they work?
- Gas sensors (also known as gas detectors) are electronic devices that detect and identify different types of gasses. They are commonly used to detect toxic or explosive gasses and measure gas concentration.
Gas sensor detects the presence or concentration of gases in the atmosphere. Based on the concentration of the gas the sensor produces a corresponding potential difference by changing the resistance of the material inside the sensor, which can be measured as output voltage. Based on this voltage value the type and concentration of the gas can be estimated.
2. How to use MQ-7 Gas Sensor?
- Power the module with 5V and you should notice the power LED on the module to glow and when no gas it detected the output LED will remain turned off meaning the digital output pin will be 0V. Remember that these sensors have to be kept on for pre-heating time before you can actually work with it. Now, introduce the sensor to the gas you want to detect and you should see the output LED to go high along with the digital pin, if not use the potentiometer until the output gets high. Now every time your sensor gets introduced to this gas at this particular concentration the digital pin will go high (5V) else will remain low (0V).