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Summary of Contents for Winsen MH-Z14
- Page 1 Intelligent Infrared Carbon Dioxide Module (Model: MH-Z14) User’s Manual V2.4 Valid from May 1 ,2014 Zhengzhou Winsen Electronics Technology CO., LTD.
- Page 2 Statement The copyright of this manual belongs to Zhengzhou Winsen Electronics Technology Co., LTD. Without the written permission, any part of this manual shall not be copied, translated, stored in database or retrieval system, also can’t spread through electronic, copying, record ways.
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Page 3: Main Functions And Features
MH-Z14 NDIR CO2 Module 1. Profile MH-Z14 NDIR Infrared gas module is a common type, small size sensor, using non-dispersive infrared (NDIR) principle to detect the existence of CO in the air, with good selectivity, non-oxygen dependent and long life. Built-in temperature sensor can do temperature compensation; and it has digital output and analog voltage output. -
Page 4: Main Technical Parameters
4. Main technical parameters Working voltage 4.5 V ~ 5.5V DC < 85 mA Average current Interface level 3.3 V Measuring range 0~5%VOL optional Output signal UART 0.4-2V DC Preheat time 3min < 90s Response Time Working temperature 0℃ ~ 50℃ Working humidity 0~95%RH Weight... - Page 5 6. Definition for pins Description Pad1/Pad15/Pad17 Vin（input voltage 4.5V～5.5V） Pad2/Pad3/ Pad12/Pad16 Pad4 Vout2 (0.4～2V) Pad5 Vout1 (0～2.5V) Pad6 Pad8 Pad7/Pad9 Pad11/Pad14/Pad18 UART（RXD） 0～3.3V input digital Pad10/Pad13/Pad19 UART（TXD） 0～3.3V output digital 7. Circuit...
- Page 6 8. Operating instruction 8.1 Analog output connections The output value of Vout1 is 0-2.5V, which stands for 0 to full range. The output value of Vout2 is 0.4-2V, which stands for 0 to full range. Vin –5V GND- Power Ground Vout2-ADC input After preheating, the value of output voltage from Vout2 represents gas concentration.
- Page 7 Account formula for CO2 concentration which gets through PWM: 2000 Among: is calculated CO2 concentration, unit is ppm; is time for high level during an output cycle; T is time for low level during an output cycle. 8.3 Digital connects: Vin-5V power GND- Power Ground...
- Page 8 8.3.1 Communication protocol 1. General Settings Baud rate 9600 Date byte 8 byte Stop byte 1byte Calibrate byte 2. Command Each command or return： Contains 9 bytes (byte 0 ~ 8) Starting byte fixed 0 XFF Command contains sensor number (factory default to 0 x01) to check and end Command List: 0x86 Gas concentration...
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Page 9: Notes For Maintenance
9.2 Do not use the sensor in the high dusty environment for long time. 9.3 Please use the sensor with correct power supply. 9.4 Forbidden to cut the sensor pin. Zhengzhou Winsen Electronics Technology Co., Ltd Add.: NO.299 Jin Suo Road, National Hi-Tech Zone, Zhengzhou, 450001 China Tel.: 0086-371-67169097 67169670...
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