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Dual Beam NDIR CO2 Sensor-CM1107BN

Dual Beam NDIR CO2 Sensor-CM1107BN
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SPECIFICATION Product Name: Dual Beam NDIR CO2 Sensor Module Item No.: CM1107BN Version: V0.1 Date: October 16, 2019

Dual Beam NDIR CO2 Sensor Module CM1107BN Applications ▪ Condensing gas boiler ▪ IAQ monitor ▪ VRV ▪ HVAC industry ▪ IoT devices ▪ Intelligent agriculture ▪ Storage and cold-chain Description CM1107BN is a dual beam (single light source, dual channel) NDIR CO2 sensor, based on non-dispersive infrared (NDIR) technology, which can detect CO2 concentration of indoor air. With higher accuracy, superior long term stability, it is widely used for boiler, ventilation system, air purifier, air conditioner, intelligent agriculture, storage and cold-chain, etc. Features ▪ NDIR technology with...

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Dimensions and Connector 1. Dimensions (Unit mm, tolerance ±0.2 mm) Power supply output (+3.3V/100mA) Power supply input voltage, +5V Power supply input (GND) RS485 control terminal (Reserved) Manual calibration

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Typical Application Circuit Application scene 1: UART TTL serial port output Application scene 2: UART 3.3V level transfer to 5V

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Description of Calibration 1. Auto calibration ( Closed default, if open please refer to the protocol) Rough installing, non-correct soldering and transportation might result in a reducing of sensor reading accuracy and zero drift. Therefore, the sensor can corrects the drift by a built-in auto-calibration algorithm. When the sensor power-on time is accumulated for 7 days, the minimum CO2 concentration detection value is stored and recorded, and the sensor automatically performs the calibration algorithm. Put the sensor in the environment where the CO2 concentration level can reach 400ppm...

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1. PWM output PWM cycle: 1004ms Positive pulse width: (PPM/12)+2ms CO2 concentration detect value:（PWM positive pulse width-2）*12 PWM output schema: Note:1. Add 5K-10K pull-up resistor between pin P and 5V. 2. Alarm output In the process of rising CO2 concentration, when the CO2 concentration value is >1000ppm, the alarm is triggered, and the alarm output terminal outputs a high level. When the concentration value drops to 800ppm, the alarm is released, and the alarm output returns to the low level output.

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Product Installation 1. In order to ensure airflow diffusion into the sensor inner, make sure the minimum distance between the area of waterproof filter and the other components is 1.5 mm, otherwise, quick response time of the sensor will be affected. Reference as below: Waterproof Filter 2 .To avoid the influence of stress on sensor, please soldering by hand as much as possible when mounting the sensor to the PCB. Reference as below:

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1). The data in this protocol is all hexadecimal data. For example, “46” for decimal [70]. 2). Baud rate: 9600, Data Bits: 8, Stop Bits: 1, Parity: No, Flow control: No. 3). [xx] is for single-byte data (unsigned, 0-255); for double data, high byte is in front of low byte. Sending format of upper computer:

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4.1 Read Measured Result of CO2 Send: 11 01 01 ED Response: 16 05 01 DF1- DF4 [CS] Function: Read measured result of CO2 (Unit: ppm) Note: CO2 measured result = DF1*256+DF2; DF3,DF4 is reserved Example: Response: 16 05 01 02 58 00 00 8A Explanation: Hex is converted to decimal: 02 is 02; 58 is 88 CO2 concentration=02*256+88 = 600ppm 4.2 Open/Close ABC and Set ABC Parameter Send: 11 07 10 DF1 DF2 DF3 DF4 DF5 DF6 CS Response: 16 01 10 D9 Explanation: DF1: Reserved, default 100 (0x64) DF2: Open/close auto calibration (0: open; 2: close, default close) DF3: Calibration cycle (1-255 days...

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4.2.3 Change the Calibration Cycle If you want to change the calibration cycle to 10 days, you should set the DF3=10. Send: 11 07 10 64 00 0A 01 90 64 75 Response: 16 01 10 D9 4.3 Calibration of CO2 Concentration Send: 11 03 03 DF1 DF2 CS Response: 16 01 03 E6 Function: Calibration of CO2 concentration Note: 1. Calibration target value = DF1*256+DF2 Unit: PPM, range (400-1500ppm) 2. Before calibration, please make sure CO2 concentration in current ambient is calibration target value. Keeping this CO2 concentration for two 2 minutes, then began calibration. Example: When you need to...

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Tray Size After-Sales Services and Consultancy Cubic Sensor and Instrument Co., Ltd. Tel: +86 (0)27 81628827 Fax: +86 (0)27 81628821 Add: Fenghuang No.3 Road, Fenghuang Industrial Park, Eastlake Hi-tech Development Zone, Wuhan 430205, China E-mail: info@gassensor.com.cn

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