Carbon Dioxide Sensor MG811 C02 Module Air

Carbon Dioxide Sensor MG811 C02 Module Air 

Specification

• Product Name: MG811 CO₂ Sensor Module

• Sensor Type: Electrochemical (Solid Electrolyte, Metal Oxide Semiconductor)

• Model Number: MG811

• Detection Gas: Carbon Dioxide (CO₂)

• Module Type: Analog Output with onboard signal conditioning circuit

• Supply Voltage: 6V(Regulated on-board to 5V for sensor)

• Target Applications: Air quality monitoring, greenhouse automation, HVAC systems, CO₂ alarms, environmental sensing

Electrical Specifications

• Heater Voltage: 6.0 ± 0.1V (via on-board regulator)

• Heater Resistance: ~31Ω ± 3Ω

• Heater Power Consumption: Approx. 0.9W

• Analog Output Voltage Range: 0 – 2V (typical)

• Digital Output: Logic LOW when CO₂ concentration exceeds threshold (depends on onboard comparator setting)

• Preheat Time: ≥ 24 hours for accurate readings

• Response Time: ≤ 60s

• Recovery Time: ≤ 60s

Measurement Specifications

• Detection Range: 350 ppm – 10,000 ppm (0.035% – 1% CO₂)

• Sensitivity: High sensitivity to CO₂ gas

• Resolution: ~10 ppm

• Accuracy: ±200 ppm or ±5% of reading (typical)

• Output Type:

  • Analog Output (AO): Proportional to CO₂ concentration

  • Digital Output (DO): Adjustable threshold with potentiometer

• Baseline Drift: May occur due to temperature/humidity changes; calibration required for accurate applications

Pin Configuration (4-Pin Header):

Environmental Conditions

• Operating Temperature: 0°C to +50°C

• Storage Temperature: -20°C to +60°C

• Humidity Range: 0 – 95% RH (non-condensing)

• Lifespan: Approx. 5 years in clean air environment

• Preheat Requirement: Minimum 24 hours for stable operation

Calibration & Tuning

• Factory Calibration: Required for absolute CO₂ readings

• User Calibration: Possible using standard reference gas and linear regression on analog output

• Potentiometer: For digital threshold adjustment (DO output trigger level)

Features & Benefits

• High sensitivity and selectivity to CO₂

• Fast response and recovery

• Analog and digital signal outputs

• Onboard comparator with adjustable trigger point

• Suitable for integration with microcontrollers (Arduino, Raspberry Pi, ESP32, etc.)

• Long life and reliable performance

Applications

• Indoor air quality monitoring

• HVAC and ventilation control

• Smart agriculture and greenhouse automation

• Environmental data logging systems

• IoT-based CO₂ detection projects

• Classroom or office air quality alarms

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