MH-Z19 MH-Z19C MH-Z19E MH-Z19B IR Infrared CO2 Sensor Carbon Dioxide Gas Sensor Module CO2 Monitor 400-5000 0-5000ppm UART PWM 1

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MH-Z19B carbon dioxide gas sensor (hereinafter referred to as the sensor) is a general-purpose smart small-scale sensor that uses non-dispersive infrared (NDIR) principle to detect the presence of CO2 in the air, with good selectivity and anaerobic Gas dependence, long life and other characteristics; built-in temperature compensation; at the same time with serial output, analog output and PWM output, easy to use. The sensor is a high-performance sensor that combines mature infrared absorption gas detection technology with precise optical path design and sophisticated circuit design. Parameters: Product model number: MH-Z19B Gas Detection: Carbon Dioxide Supply voltage: 4.5~5.5V DC Average current: <20mA (@5V power supply) Peak current: 150 mA (@5V supply) Interface level: 3.3V (5V compatible) Measurement range: 0~10000ppm can be selected within the range Warm-up time: 3min Response time: T90<120s Working temperature: 0～50°C Operating Humidity: 0 to 95% RH (non-condensing)

Characteristics: Gas chamber with gold plating, waterproof and corrosion resistant High sensitivity, low power consumption Excellent stability Temperature compensation, excellent linear output Provides serial (UART), analog (DAC), PWM waveform output methods long lasting Water vapor interference, not poisoning

Application: HVAC refrigeration equipment Air quality monitoring equipment Fresh air system Air purification equipment Smart home SCHOOL

Vin: Power Positive (Vin) GND: Negative Power Supply (GND) Vo: Analog output PWM: PWM HD: HD (zero for school, low for more than 7 seconds) Rx: UART(RXD) TTL Level Data Input Tx: UART (TXD) TTL level data output

Pin 1: Analog Output Vo Pin 2: None Pin 3: Negative Power Supply (GND) Pin 4: Positive Power Supply (Vin) Pin 5: UART(RXD) TTL Level Data Input Pin 6: UART (TXD) TTL Level Data Output Pin 7: None

The MH-Z19C carbon dioxide gas sensor (hereinafter referred to as the sensor) is a general-purpose intelligent small sensor that uses the principle of non-dispersive infrared (NDIR) to detect the presence of C02 in the air. And other features; built-in temperature compensation: simultaneously has serial output, PWM output, easy to use. The sensor is a high-performance sensor made by closely combining mature infrared absorption gas detection technology with sophisticated optical circuit design and sophisticated circuit design.

Product parameters: Detection gas: carbon dioxide Power supply voltage: DC (5.0 ± 0.1) V Average current: <40mA (@5V power supply) Peak current: 125 to (@5V power supply) Interface level: 3. 3v (compatible with 5v) Measuring range: 400-5000PPM optional Output signal: serial UART (TL level 3.3V) Warm-up time: 1min Response time: T90< 120s Working temperature: -10-50degree Working humidity: 0~95%RH (no condensation)

Pin description: Vin: Power +(in) GND: power supply-(GND) PWM: PWM Hd: HD (zero calibration, low level is effective for more than 7 seconds) Rx: UART (RXD) TTL level data input Tx: UART (TXD) TTL level data output

Output method:

PWM output Assume the measurement range is 400-2000ppm CO2: Concentration output range: 400-2000ppm Period: 1004ms±5% High level output at the beginning of the cycle: 2ms (theoretical value) Central period: 1000ms±5% Low level output at the end of the period: 2ms (theoretical value) Calculation formula for obtaining current CO2 concentration value by PWM: Cppm=2000X (TH-2ms)/(TH+TL-4ms) Cppm: CO2 concentration value calculated by the unit of ppm TH: the time when the output is high level in one output cycle TL: the time when the output is low in one output cycle

Serial output (UART) Hardware connection, connect the sensor's Vin-GND-RXD-TXD to the user's 5V-GND-TXD-RXD. (User terminal must use TTL level)

Precautions: 1. In the process of welding, installation and use of the sensor, the gold-plated plastic cavity should be prevented from withstanding pressure in any direction. 2. If the sensor needs to be placed in a small space, this space should be well ventilated, especially the two diffusion windows should be in a well ventilated position. 3. The sensor should be far away from the heat source, and avoid direct sunlight or other heat radiation. 4. The sensor should be calibrated regularly, and the calibration period is recommended to be no more than 6 months. 5. Do not use the sensor for a long time in the environment with high dust density. 6. In order to ensure that the sensor can work normally, the power supply voltage must be maintained at (5.0 ± 0.1) VDC. The power supply current must not be less than 150mA 7. If it is not within this range, the sensor may be faulty, the output concentration of the sensor is low or the sensor cannot work normally. 8. When manually calibrating the zero point or sending the command to calibrate the main points, it must be stable 9. Work continuously for more than 20 minutes in a gas environment (400ppm). 10. The sensor is prohibited to use wave peak depth. 11. When welding with iron, set the temperature to (350±5) degree, early 12. The pick-up time must be less than 35. 13. When using the sensor, it is recommended that the customer use the method of inserting the solder bump to directly insert and remove the sensor for toilet maintenance.

Product Details: The MH-Z19D carbon dioxide gas sensor (hereinafter referred to as the sensor) is a general-purpose intelligent small sensor. It has two products: pin and terminal. It uses the principle of non-dispersive infrared (NDIR) to detect CO2 in the air and has good selectivity. , No oxygen dependence, long life, etc.; built-in temperature compensation; also has serial port output, PWM output, easy to use. The sensor is a high-performance sensor made by closely combining mature infrared absorption gas detection technology with precise optical circuit design and sophisticated circuit design. Sensor characteristics: High sensitivity, low power consumption Excellent stability Temperature compensation, excellent linear output Provide serial port (UART), PWM waveform and other output methods long lasting Anti-water vapor interference, no poisoning Application: HVAC equipment Air quality monitoring equipment Fresh air system Air purification equipment Smart home school Parameters: Product model: MH-Z19D Detection gas: carbon dioxide Power supply voltage: DC(5.0±0.1)V Average current: <40mA (@5V power supply) Peak current: 125 mA (@5V power supply) Interface level: 3.3V (compatible with 5V) Measuring range: 400~10000ppm optional Output signal: serial port (UART) (TTL level 3.3V); PWM Warm-up time: 1min Response time: T90 <120s Working temperature: -10℃～50℃ Storage temperature: -20℃～60℃ Working humidity: 0～95%RH (non-condensing)

condition: New Hazmat: None material: Carbon Fiber deliveryOptionStandard: Yes name: MH-Z19 MH-Z19C MH-Z19E MH-Z19B IR Infrared CO2 Sensor Carbon Dioxide Gas Sensor Module CO2 Monitor 400-5000 0-5000ppm UART PWM 1 source: asc brand: No Brand preorder: No