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Descripción
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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
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 150mA7. 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 stable9. 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, early12. 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.
