MH-Z19B NDIR Infrared CO2 Sensor for Carbon Dioxide 0-5000ppm


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.

Product Parameters

1. Product model number: MH-Z19B

2. Gas Detection: Carbon Dioxide

3. Supply voltage: 4.5~5.5V DC

4. Average current: <20mA (@5V power supply)

5. Peak current: 150 mA (@5V supply)

6. Interface level: 3.3V (5V compatible)

7. Measurement range: 0~10000ppm can be selected within the range

8. Output signal: Serial (UART) (TTL level 3.3V)/ PWM/ Analog output (DAC) (default 0.4~2V) (0~3V range configurable)

9. Warm-up time: 3min

10. Response time: T90<120s

11. Working temperature: 0~50°C

12. Operating Humidity: 0 to 95% RH (non-condensing)

13. Weight: 5g

14. Life: >5 years


Sensor Characteristics

1. Gas chamber with gold plating, waterproof and corrosion resistant

2. High sensitivity, low power consumption

3. Excellent stability

4. Temperature compensation, excellent linear output

5. Provides serial (UART), analog (DAC), PWM waveform output methods

6. long lasting

7. Water vapor interference, not poisoning



HVAC refrigeration equipment

Air quality monitoring equipment

Fresh air system

Air purification equipment

Smart home



Vin: Power Positive (Vin)

GND: Negative Power Supply (GND)

Vo: Analog output


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

40 JD
In stock

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