USERS MANUAL. Infrared Carbon Dioxide Module CM1102(Dual Beam With T&RH) V1.20. Wuhan Cubic Optoelectronics Co.,Ltd

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1 USER MANUAL 1 Infrared Carbon Dioxide Module CM1102(Dual Beam With T&RH) Wuhan Cubic Optoelectronics Co.,Ltd ADD:Fenghuang No. 3 Road, Fenghuang Industrial Park, Eastlake Hi-tech Development Zone, Wuhan , China TEL: FAX: info@gassensor.com.cn V1.20

2 Light detector Basic mathematical model : A majority of both organic and inorganic polyatomic gas have specific absorptive wavelength in infrared region. It observes Lambert-Beer Law formula I= I0e-kpl when infrared light is coming through. Light absorption intensity i can be described as i=i0-i= I0 (1- e-kpl). I0: intensity of incoming ray. I: transmitting beams. l :thickness of gaseous medium. p: gas concentration. k: absorption coefficient. Infrared CO2 gas module Technology Range Accuracy Response time T90 Temperature Sensor Humidity Sensor NDIR ppm up to ppm ±(40ppm+2% reading) 60s Working Temperature Range 0-50 Working Humidity Range -10 to 50 Resolution: 0.1 Accuracy: 0.5 5~99%RH Resolution: 0.1%RH Accuracy: 5%RH 0-95%RH no-condensing USER MANUAL 2 1. Briefing Welcome to use infrared carbon dioxide gas sensor module CM1101 series. It adopts advanced non-dispersive infrared technology (NDIR) a, which can be integrated in safety and alarming devices, able to be used for CO2 concentration detecting, air quality monitoring, HVAC, buildings, schools, medical, air conditioning, environmental monitoring, mushroom farming, fireplace CO2 gas control etc. 2. Working Principle CO2 gas is composed of different types of atoms have absorption spectrum in infrared range. Absorption intensity abides by Lamber-Beer s Law. Basic working principle of NDIR sensor is as below, Inlet outlet 3. Specification spectral filter

3 3 Sampling Method Diffusion Power Supply/Consumption DC 5V±5% Pmax0.6w Size Signal Output Life Time 57*62*14.3 mm PWM,RS232-TTL,0-4V 10 years 4. Dimensions & I/O definitions 4.1 Dimensions 4.2 I/O definitions Pins Items Definitions 1 TX UART TX(SENDING) 2 RX UART RX(RECEIVING) 3 +5V POWER SUPPLY INPUT(+5V) 3 INFRARED CARBON DIOXIDE SENSOR cubic

4 4 4 GND POWER SUPPLY INPUT(GND) 5 PWM PULSE WIDTH MODEM (OPTIONAL) 6 UO VOLTAGE OUTPUT (OPTIONAL) Note:Pin1 and Pin2 are RS232 communication terminals on the board. RS232 TTL on the board is 0-3.3V, able to be compatible with 5V SCM. It should convert TTL if connecting to the computer via RS232. For example: Using transferred IC ADM3202. RS232 communication reference diagram: 4. 3 Relationship between concentration and voltage output (Optional) Relationship between concentration and voltage output is linearity: Y=1250*U Y is the concentration (ppm); U is voltage, units of V; 4 INFRARED CARBON DIOXIDE SENSOR cubic

5 5 5. PWM Output (Optional) PWM Period:1004ms Positive Pulse Width:(PPM/2)+2ms PWM Output As Follow: 6. Zeroing Make J5 short cut for 3 seconds, the NDIR CO2 sensor will automatically zero to 400ppm. Note: please do it in the fresh air with good ventilation. 5 INFRARED CARBON DIOXIDE SENSOR cubic

6 6 7. UART Communication protocol Baud rate:9600bps Data bit:8 Stop bit:1 Check bit:null Summary: 1. The data in the explanation are all hex data. Such as 46 is hexadecimal [70] 2. [xx] is single byte data(no symbol,0-255) ;(xx) is double byte data, signed integer ( to ),the top one is ahead. followed by explanation; 3. The length of the command byte is [LB]+3. Command Format: Send: [IP] [LB] [CMD] [DF] [CS] [IP] address(fixed as 11) [LB] byte length followed does not include CS, one byte [CMD] command [DF] parameter items with command, optional [CS] CS= -(IP +LB+CMD +DF) Response: a.when the command is implemented correctly, it responses [ACK] [LB] [CMD] [DF] [CS] [ACK]=0X16 right command [LB] byte length followed does not include CS, two byte [CMD] command [DF] parameter items with command, optional [CS] CS=-(ACK +LB+CMD+DF) b.when the command is not implemented correctly, it responses [NAK] [LB] [CMD] [EC] [CS] [NAK]=0X06 Command is not implemented correctly [LB]=2 byte length followed does not include CS, two byte [CMD] command [EC] the error code that command is not implemented correctly [CS] CS= -(NAK +LB+CMD+DF) [EC] 01 Order length is wrong 02 The command is not correct 03 Can't implement this command under current status. 04 Command is not implemented correctly 6 INFRARED CARBON DIOXIDE SENSOR cubic

7 7 Function list No Function CM D 1. measuring results 0x0 check 1 2. measuring results 0x0 check 2 3. software version check 0x1 E 4. sensor serial No. 0x1 check F Description Besides measuring data, it also has status information Measurement results of each component Detail description 1. Look up measurement result Send: ED Response: DF1 DF2 DF3 DF4 DF5 DF6 DF7 DF8CS Function:Look up measurement result. Info: Remark Data Decimal Value Corresponding Value Multiple Effective Range CO2 [DF1][DF2] 0 ~ ~ 5000 ppm 1 Temperature [DF3][DF4] 0 ~ 700 0~70 10 Humidity [DF5][DF6] 50 ~ ~ 99.0 % 10 Reserve [DF7][DF8] 1.Temperature = (DF3*256+DF4)/10.If the temperature data are more than 32768, it will be negative temperature, temperature data =- (DF3*256+DF )/10 2.The measurement data is expressed by two bytes, Measurement Data=DFn*256+DFn+1 Example: CO2 = 1* = 400 ppm Temperature=(1*256+4)/10 = 20 Humidity=(2*256+2)/10 = 51.4 % CO2 Set Zero & Calibration Send: EB Response: E6 Function: Adjust the current CO2 concentration to the setting value, the default data is 400 ppm 7 INFRARED CARBON DIOXIDE SENSOR cubic