Infrared Carbon Dioxide Sensor Module CM1107-Dual Beam

Transcription

1 Infrared Carbon Dioxide Sensor Module CM1107-Dual Beam CM1107 Specification Working temperature -10 ~+50, 5~95%RH Introduction Dual beam (single light source, dual wavelength) CM1107 CO2 gas sensor module is mainly used to detect CO2 concentration by adopting non-dispersive infrared (NDIR) technology. It is widely used for home ventilation system, air conditioner control, agricultural cultivation, storage and cold-chain transportation. Main features Advanced non-dispersive infrared technology (NDIR) with independent intellectual property Full range temperature correction Dual beam with better accuracy and high stability Small size and compact structure and easy to install Storage Condition Sampling frequency Measurement range Accuracy Respond Time Signal output PWM output Alarm Output -20 ~+60,0~95%RH(non-condensing) 1s pm( ppm could be customized) ±(50ppm+3% of reading) 120s UART: TTL(3.3v electrical level) PWM: linear output Minimum output concentration : 0ppm, Output cycle:1004ms Output high level minimum duration:2ms (0ppm) Output high level maximum duration: 1002ms (500ppm) Output high level alarm concentration:>1000ppm Output low level normal concentration: <800ppm Application Ventilation system Central air conditioner Agricultural cultivation Storage Cold-chain transportation Size L33mm* W21.7mm* H18.9mm Weight 6.3g Power supply DC 5V±5%,Ripple: <50mV Peak current <120mA Working current Average 55mA. Peak 140mA Life span 10 years

2 Principle of measurement Molecule like CO2 and CO is composed of different types of atoms, it has absorption spectrum in infrared range. Absorption intensity abides by Lambert-Beer s Law. When light wave corresponded to certain gas with absorption spectrum passes through measured gas, the intensity of light wave will be significantly weakened. The intensity attenuation is related to concentration of measured gas. This relation follows Lambert-Beer s Law. Basic working principle of NDIR sensor is as below, Basic mathematical model:a majority of both organic and inorganic polyatomic gas have specific absorptive wavelength in infrared region. When infrared light passed by, the light transmissivity of this gas molecule to certain wavelength can be expressed by Lambert-Beer Law: I stands for light transmissivity, I=I 0 e -kpl i stands for light absorption intensity, i=i 0 -I= I 0 (1- e -kpl ) I 0 : incident light intensity. l: thickness of gaseous medium p: gas concentration k: absorption coefficient

3 Pin connections CON4 CON5 Pin No Name Description Pin No Name Description 1 +5V Power supply input voltage,+5v V Power supply output (+3.3V/100mA) 2 GND Power supply input (GND) 2 RX UART-RX (Receiving) 3 A Alarming 3 TX UART-TX (Sending) 4 PWM PWM output 4 R/T RS485 (Reserved) 5 CA Manual calibration Typical application circuit 5V-3.3V Level Shift, RX, TX Level Shift

4 Description of calibration Auto calibration: Rough installing, non-correct soldering and transportation might result in a reducing of sensor reading accuracy and zero drift, sensor will correct the drift by the built-in self-correcting. Powering on the sensor for 7 days continuously, it will record the lowest CO2 concentration measurement value during these 7 days. Sensor will do auto calibration after 7 days, and will regard the outdoor fresh air CO2 concentration (400ppm) as baseline. In order to ensure the reading accuracy after auto calibration, please make sure the working environment of sensor can reach the outdoor fresh air level, that is to say, the CO2 concentration of sensor can reduce to the outdoor air level during the 7 days. Note: Please contact with Cubic for more detailed auto calibration strategy. Manual calibration: Rough installing, non-correct soldering and transportation might result in a reducing of sensor reading accuracy and zero drift. If need to recover accuracy quickly after installing, you can do manual calibration. To put the sensor in the environment where the CO2 concentration level can reach 400ppm, and to ensure the CO2 concentration in this environment is stable before calibration. The CA pin of sensor should be well connected at least 2 seconds when doing the manual calibration. Sensor will activate the calibration program after 6 seconds. In addition, sensor also can do manual calibration by sending command, please refer to the communication protocol for more details.

5 PWM output Measurement range: ppm PWM cycle:1004ms Positive pulse width:(ppm/5)+2ms PWM output schema: Alarm Output If the CO2 concentration rises up to more than 1000ppm, the alarming will be triggered and output high level. When the CO2 concentration goes down to below 800ppm, the alarming will stop and output low level.

6 Dimensions

7 Reliability test Test List Test Condition Standard Operating the sensor with power on 25±2, CO2 accuracy: Normal temperature (50+10)%RH, detecting the measurement error of the sensor in ±(50ppm + 3% different CO2 concentration. reading) Operating the sensor powered 25±2, CO2 accuracy: Low humidity (30±5)%RH, detecting the measurement error of the sensor in ±(50ppm + working different CO2 concentration. reading) 3% Operating the sensor powered 25±2, CO2 accuracy: High humidity (80±5)%RH, detecting the measurement error of the sensor in ±(50ppm + working different CO2 concentration. reading) 3% Responding time test Installing the sensor on test kit, then put into test chamber. Inject Preheating time 2min, CO2 gas, read CO2 concentration of the chamber by using CO2 responding time is 10s online analyzer. Read CO2 value every second by UART test after normal working. operator SSCOM32. Saved every second value after it is stable. Leave the sensor -20±2 without power on, Low temperature keep for 96 hours, detecting the measurement error of the sensor storage under. Operating the sensor powered -10±2 for 96 Low temperature hours, detecting the measurement error of the sensor in different working CO2 concentration. Operating the sensor 60±2, (50±10)%RH High temperature without powering on, keep for 96 hours, detecting the storage measurement error of the sensor in different CO2 concentration. Operating the sensor with power on 50±2, High temperature after 96 hours, detecting the measurement error of the sensor in working different CO2 concentration. Impact test Leave the sensor in ambient of -20 for 60mins then move it to ambient of +60 for 60mins. Keep this cycle for 10 times. Samples are powering off during the test. High temperature, Leave the sensor in the high temperature, high humidity ambient high humidity of 40±2,90% ~ 95%RH, add the highest voltage within working(endurance voltage working range. Keep for 500 hours.(in the ambient of test) 25,50%RH, make sure to work for 30000hours continuously) Salt spray test According to GB/T , leave the sensor in the 35 No red rust on the salt-fog cabinet, spray it with 5% sodium chloride saltwater for sensor surface 24 hours. Clean the sensor after test. Sample qty: N Defective qty: C n=10 c=0 n=5 c=0 n=2 c=0

8 Vibration test Drop test Hz/min, with amplitude of 1.5mm, vibrate in X,Y,Z direction, each direction for 2 hours. Drop the sensor from 70cm height down to the hard wooden board randomly for three times. No falling of terminal after test, sensor can match performance test standard. n=4 No falling of terminal c=0 after test, sensor can match performance test standard. Normal monitoring of ageing Monitor endurance Put the sensor on ageing rack and power on continuously. Test the sensor accuracy each week in the first month. And then test one time each month. Leave the sensor in the 50 oven. Test the sensor accuracy each week in the first month. And then test one time each Test the sensor accuracy regularly until failing High temperature, high humidity speed n=10 c=0 test month. According to the failure time, evaluate sensor life span up formula to get by Arrhenius. sensor life span. Note: (1) The definition of normal humidity: temperature range: 25±2, humidity range: 50±10%RH. (2) The definition of sensor normal working: Sensor can measure normally and output value.

9 Ordering information After-sales services and consultancy TEL: FAX: ADD: Fenghuang No.3 Road,Fenghuang Industrial Park, Eastlake Hi-tech Development Zone, Wuhan ,China WEB: