1、ALARM OUTPUT FUNCTION: The MTP50 module supports alarm output with the Alarm OC pin. The Alarm OC pin is configured as an open drain output mode and requires an external pull up resistor for operation. 2、ACCURATE CO2 DETECTION: When the measured CO2 concentration exceeds 1000PPM, the Alarm OC pin outputs a high level. Conversely, when the measured CO2 concentration is below 80PPM, the Alarm OC pin outputs a low level. 3、ERROR DETECTION: In the event of a module error, the Alarm OC pin will remain at a high level, alerting users to potential malfunctions. 4、NDIR TECHNOLOGY: The MTP50 A adopts non dispersive infrared (NDIR) principle for detecting carbon dioxide in the air. It offers high sensitivity, low power consumption, and excellent stability. 5、WIDE APPLICATION RANGE: This CO2 sensor is suitable for various applications, including AC equipment, air quality monitoring devices, fresh air systems, air purification equipment, smart homes, and air testing devices in schools. 1 x NDIE Dual Channel CO2 Sensor Item Type: Carbon Dioxide SensorMaterial: ABS, MetalGas Type: CO2Measurement Principle: NDIRMeasurement Range: 400ppm to 5000ppmMeasurement Interval: 2 secondsMeasurement Accuracy: ±(50ppm + 5% of reading)Response Time: T90 in 90 secondsOperating Temperature Range: 0 to 50℃Operating Humidity Range: 0 to 90% RH (non condensed)Storage Temperature Range: -20℃ to 60℃Lifespan: Over 10 yearsCommunication Interface: UART, IC PWM OutputPeriod: 1004msPulse: 2ms to 1002ms (0 to 5000ppm)Alarm Output: Concentration > 1000ppm outputs 1, Concentration < 800ppm outputs 0Output Pin: Open drain output mode, no current consumptionSelf Calibration Period: First self calibration within 24 hours of power on, then every 7 days