Description:
The MQ-7 Carbon Monoxide Gas Sensor is a semiconductor-based device designed to detect carbon monoxide (CO) concentrations in the air. It utilizes a tin dioxide (SnOâ‚‚) sensitive layer, which demonstrates low conductivity in clean air and increases in the presence of CO gas. This behaviour enables the detection of CO concentrations ranging from 10 ppm to 500 ppm, making it suitable for applications such as CO alarms, industrial safety systems, and portable gas detectors.
The sensor operates with a dual heating cycle, alternating between high and low temperatures to enhance detection accuracy and longevity. It requires a heating voltage of 5V during the high-temperature phase and 1.4V during the low-temperature phase. The MQ-7 provides an analog output signal, which can be easily interfaced with microcontrollers and ADC modules for monitoring and analysis. Its compact design and high sensitivity make it an excellent choice for CO detection applications.
Specifications:
- Target Gas: Carbon Monoxide (CO)
- Detection Range: 10 ppm to 500 ppm
- Heater Voltage: 5V (High), 1.4V (Low)
- Load Resistance (RL): Adjustable (typically 10 kΩ)
- Preheat Time: ≥48 hours
- Operating Temperature: -20°C to 50°C
- Operating Humidity: ≤95% RH
- Sensitivity: Rs(in air)/Rs(100 ppm CO) ≥ 5
- Response Time: ≤20 seconds
- Recovery Time: ≤30 seconds
Features:
- High sensitivity to carbon monoxide
- Stable and long lifespan
- Simple drive circuit
- Fast response and recovery times
- Compact and easy to integrate into various applications
Contents:
- 1 x MQ-7 Carbon Monoxide Gas Sensor Module
