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The carbon dioxide sensor adopts the principle of nondispersive infrared (NDIR), and has undergone precise calibration during production. The calibration data is stored in internal memory. The sensor has the characteristics of digital output and complete mutual rotation, without the need for complex verification and calibration processes.
It is outstanding in measurement accuracy, linearity, repeatability, mutual rotation, consistency, and other aspects. It is designed with a temperature compensation circuit and can be used at different environmental temperatures, suitable for various fields that need to measure carbon dioxide concentration.
Features
uFlexible installation and convenient use
uHigh cost-effectiveness, wide voltage design
uSmall size, light weight, and anti vibration
uNon dispersive infrared (NDIR) principle carbon dioxide sensor, precise and reliable
u485 communication, standard ModBus RTU communication protocol, communication address can be set, and the maximum communication distance is 2000 meters
Parameters
Supply voltage |
10~30V DC |
Output signal |
RS485 (standard Modbus RTU protocol, device default address: 01) |
Measurement parameters |
Carbon dioxide concentration |
Measuring range |
0~2000, 5000, 10000 ppm (other ranges optional) |
Resolution ratio |
1ppm |
Measuring accuracy |
±(50ppm+3%FS) (25¡É) @400-5000ppm |
Operation temp. |
-20¡É~50¡É |
Stability time |
2 minutes usable 10 minutes maximum accuracy |
Response time |
Generally less than 90s during 90% step change |
Cable specifications |
4-wire(RS485) (cable length optional) |
Dimension![](https://ae01.alicdn.com/kf/S4091fe8ff77040feaa6a4db5005aa37eL.png)
Hardware connection
Wiring connection
The air carbon dioxide sensor can be connected to various data collectors and data acquisition cards carrying differential inputs,the wiring diagram for remote data collection modules and other equipment is shown in the following figure:
![](https://ae01.alicdn.com/kf/S3076587a79c0413a9588d92d2cc7f58c9.png)
Attention
Be careful when wiring. If the power supply voltage is too high or the polarity is reversed, it will cause permanent damage to the sensor.
Data conversion
Basic communication parameters
RS485 signal, standard Modbus RTU protocol
Baud rate: 4800; Check bit: none; Data bit: 8; Stop bit: 1
Address modification
For example, changing the address of a sensor with address 1 to address 2, host ¡æ slave
Address code |
Function code |
Starting register high |
Starting register low |
Starting address high |
Starting address low |
CRC16 low |
CRC16 high |
0x01 |
0x06 |
0x07 |
0xD0 |
0x00 |
0x02 |
0x08 |
0x86 |
If the sensor receives correctly, the data will be returned along the original path.
Note: If you forget the original address of the sensor, you can use the broadcast address 0XFF instead. When using 0XFF, the host can only connect to one slave, and the return address is still the original address, which can be used as an address query method.
Query data
Query the data (carbon dioxide) of the sensor (address 1), host ¡æ slave
Address code |
Function code |
Starting register high |
Starting register low |
Starting address high |
Starting address low |
CRC16 low |
CRC16 high |
0x01 |
0x03 |
0x00 |
0x00 |
0x00 |
0x01 |
0x84 |
0x0A |
If the sensor receives the correct data, return the following data from the slave to the host
Address |
0X01 |
|
Function code |
0X03 |
|
Data length |
0X02 |
|
Register 0 data high |
0X0E |
Carbon dioxide concentration: 3682ppm |
Register 0 data low |
0X62 |
CRC16 low |
0X3D |
|
CRC16 high |
0XCD |
|
Notes
1) Do not apply this device to systems involving personal safety.
2) Do not install the device in a strong convective air environment for use.
3) Equipment should avoid contact with organic solvents (including silicone and other adhesives), coatings, chemicals, oils, and high concentration gases.
4) Equipment cannot be used in environments containing corrosive gases for a long time, as corrosive gases can damage sensors.
5) Do not place the device in high concentration organic gases for a long time, as long-term exposure may cause the zero point of the sensor to drift and slow recovery.
6) Prohibit long-term storage and use in high concentration alkaline gases.
7) Although this product has high reliability, we recommend checking the equipment`s response to the target gas before use to ensure on-site use.
Disclaimers
The performance data stated above was obtained under the testing conditions of our testing system and software system. In order to continuously improve the product, our company reserves the right to change the design features and specifications without prior notice. We do not assume any legal responsibility for any loss, injury or damage caused by this. Our company shall not be liable for any indirect losses, injuries or damages caused by the use of this document, the information contained therein, or any omissions or errors therein. This document does not
constitute a sales offer, and the data contained therein is for reference only and cannot be considered a guarantee. Any use of given data must be evaluated and determined by the user. All specifications outlined are subject to change without prior notice.
Warning
To ensure normal use, users should strictly follow this manual when using this device. Any unauthorized use will not be covered by the warranty. Although our product has high reliability, we recommend checking the equipment`s response to the target gas before use to ensure on-site use.