Intelligent Infrared Carbon Dioxide Module (Model: MH-Z14)

Transcription

1 Intelligent Infrare Carbon Dioxie Moule (Moel: MH-Z14) User s Manual V2.4 Vali from May 1 st,2014 Zhengzhou Winsen Electronics Technology CO., LTD.

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 copie, translate, store in atabase or retrieval system, also can t sprea through electronic, copying, recor ways. Thanks for purchasing our prouct. In orer to enable customers to better use the prouct an reuce the faults cause by misuse, please rea the manual carefully an operate it correctly in accorance with the instructions. If users isobey the terms or remove, isassemble, change the components insie of the sensor, we shall not be responsible for the loss. The specific such as color, appearance, sizes...etc., please in kin prevail. We are evoting ourselves to proucts evelopment an technical innovation, so we reserve the right to improve the proucts without notice. Please confirm it is the vali version before using this manual. At the same time, users comments on optimize using way are welcome. Please keep the manual properly, in orer to get help if you have questions uring the usage in the future. Zhengzhou Winsen Electronics Technology CO., LTD

3 1. Profile MH-Z14 NDIR CO2 Moule MH-Z14 NDIR Infrare gas moule is a common type, small size sensor, using non-ispersive infrare (NDIR) principle to etect the existence of CO 2 in the air, with goo selectivity, non-oxygen epenent an long life. Built-in temperature sensor can o temperature ; an it has igital output an analog voltage output. This commons type infrare gas sensor is evelope by the tight integration of mature infrare absorbing gas etection technology, Precision optical circuit esign an superior circuit esign. Its esign, prouction an inspection ahere to below: GB/T Applications: MH-Z14 NDIR Infrare gas moule is applie in the HVAC, inoor air quality monitoring, inustrial process, safety an protection monitoring, agriculture an animal husbanry prouction process monitoring. 3. Main functions an features: High sensitivity, High resolution Low power consumption Output moes: UART, analog voltage signal, PWM wave Quick response, excellent linear output Goo stability Long lifespan Anti-water vapor interference No poisoning

4 4. Main technical parameters Working voltage 4.5 V ~ 5.5V DC Average current < 85 ma Interface level 3.3 V Measuring range 0~5%VOL optional PWM Output signal UART 0.4-2V DC Preheat time 3min Response Time T90 < 90s Working temperature 0 ~ 50 Working humiity 0~95%RH Weight 15 g Lifespan Dimension >5 year mm(L W H) Target Gas Measuring Range Accuracy Mark 0~2000ppm 0~5000ppm ±(50ppm Carbon Dioxie (CO2) 0~1%VOL +5%reaing ) 0~3%VOL 0~5%VOL 5. Structure

5 6. Definition for pins PIN Description Pa1/Pa15/Pa17 Vin(input voltage 4.5V~5.5V) Pa2/Pa3/ Pa12/Pa16 GND Pa4 Vout2 (0.4~2V) Pa5 Vout1 (0~2.5V) Pa6 PWM Pa8 HD Pa7/Pa9 NC Pa11/Pa14/Pa18 UART(RXD) 0~3.3V input igital Pa10/Pa13/Pa19 UART(TXD) 0~3.3V output igital 7. Circuit

6 8. Operating instruction 8.1 Analog output connections The output of Vout1 is 0-2.5V, which stans for 0 to full range. The output of Vout2 is 0.4-2V, which stans for 0 to full range. Vin 5V GND- Power Groun Vout2-ADC input After preheating, the of output voltage from Vout2 represents gas concentration. 8.2 PWM output (taking PWM output from 2000ppm as example): CO2 output range: 0ppm-2000ppm Cycle: 1004ms±5% High level output for beginning: 2ms (in name) Mile of cycle: 1000ms±5% Low level output for ening: 2ms(in name)

7 Account formula for CO2 concentration which gets through PWM: C ppm Among: 2000 ( T 2ms) /( T T 4ms) H H L C ppm is calculate CO2 concentration, unit is ppm; T H is time for high level uring an output cycle; TL is time for low level uring an output cycle. 8.3 Digital connects: Vin-5V power GND- Power Groun RXD connect sensor TXD TXD connect sensor RXD You can rea gas concentration via Uart, no nee to calculate.

8 8.3.1 Communication protocol 1. General Settings Bau rate 9600 Date byte Stop byte Calibrate byte 8 byte 1byte no 2. Comman Each or return: Contains 9 bytes (byte 0 ~ 8) Starting byte fixe 0 XFF Comman contains sensor number (factory efault to 0 x01) to check an en Comman List: 0x86 0x87 0x88 Gas concentration Calibrate zero point(zero) Calibrate span point(span) Rea gas concentration Sen Startin g byte Sensor No Check 0XFF 0x01 0x86 0x00 0x00 0x00 0x00 0x00 0x79 Return Return Starti ng byte High level concentra tion Low level concentra tion Chec k 0XFF 0x86 0x02 0x60 0x47 0x00 0x00 0x00 0xD1 Gas concentration= high level *256+low level Calibrate zero point Sen Starti ng byte Sensor No Check 0XFF 0x01 0x87 0x00 0x00 0x00 0x00 0x00 0x78 No return Calibrate span point

9 Sen Starti ng byte Sensor No. High level span point Low level span point Check 0XFF 0x01 0x88 0x07 0xD0 0x00 0x00 0x00 0xA0 No return 3. Calibration an calculation The checksum = (invert (byte )) + 1 Reaing gas concentration: Sen Starti ng byte Sensor No Check 0XFF 0x01 0x86 0x00 0x00 0x00 0x00 0x00 0x79 Except byte 0, a the other bytes together 0x1 + 0x = 0x87 Get the from the first step, an then invert it. 0xff 0x87 = 0x78 The secon plus one 0x78 + 0x01 = 0x79 Program : C language char getchecksum(char *packet) { } char i, checksum; for( i = 1; i < 8; i++) { } checksum += packet[i]; checksum = 0xff checksum; checksum += 1; return checksum; 9. Notes for maintenance 9.1 The sensor shoul be calibrate regularly. The cycle time is better to be no more than 6 months. 9.2 Do not use the sensor in the high usty environment for long time. 9.3 Please use the sensor with correct power supply. 9.4 Forbien to cut the sensor pin. Zhengzhou Winsen Electronics Technology Co., Lt A.: NO.299 Jin Suo Roa, National Hi-Tech Zone, Zhengzhou, China Tel.: Fax: sales@winsensor.com