module use nondispersiveinfrared (NDIR) principle to detect the existence of CO2 in the air, with good selectivity, non-oxygen dependant, long life.
It has digital output, analog voltageoutput, and PWM output.
4.5 V ~ 5.5V DC
<60 mA(@5V input)
150 mA(@5V input)
3.3 V (5V compatible)
0~10000ppm optional (refer to table 2)
Serial Port (UART, TTL level)
Analog output( DAC), 0.4-2V
0℃ ~ 50℃
0~90%RH (no condensation)
±10% reading value
MH-Z14A NDIR Infrared gas module isapplied
HVAC refrigeration equipment, air quality monitoring equipment, fresh air system, air purification equipment, smart home, and schools.
Automatic Baseline Correction (ABC function)
ABC function refers to that sensor itself do zero point judgment and automatic calibration procedure intelligently after a continuous operation period. The automatic calibration cycle is every 24 hours after powered on. The zero point of automatic calibration is 400ppm. From July 2015, the default setting is with built-in automatic calibration function. To use the sensor better, the sensor must be placed in clean air for over 1 hour.
ABC function is suitable for office and home environment etc…., but not for green house, farms, and refrigerators etc…., in which it requires to shut down the automatic calibration function. Then the user should do zero detection regularly, and zero calibration by command or manually.
Zhengzhou Winsen Electronics Technology Co., Ltd. is one of the professional manufacturers
specialized in the R&D and mass production of gas sensors. Our company has developed various
types of gas sensors to meet different clients' demands. Depending on years of research and development,
we have mastered gas sensor production technology.
Around 30000 square meter
Number of Production lines
Number of R&D staff
Above 50 people
Number of QC staff
More than 30 people
More than 500 people
CE; SGS; Rohs
Main market: North America; South America; Eastern Europe; Western Europe; Asia