SPECIFICATIONS

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: 400~5000ppm can be selected within the range (MH-Z19B/MH-Z19B With Pin is 0-5000ppm, MH-Z19B With Cable is 400-5000ppm)

• Warm-up time: 3min

• Response time: T90<120s

• Working temperature: 0～50°C

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

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