CO2 has a large impact on us - human activities, plants, and animals, basically everything on this planet. In agriculture, CO2 is vital for photosynthesis, and increases in CO2 concentration could be beneficial to crops such as wheat, rice, and soya beans, etc. [Source: Climate Change and World Agriculture] Whereas, a high CO2 level may lead to asphyxiation to human and animals. The CO2 emissions trapped inside the atmosphere is the major factor of global warming. CO2 also results in ocean acidification, which creates tremendous harm to marine life.

The CO2 level is also an important indicator of whether the air quality in the room is sub-par, which will suggest when we should turn on the HVAC (heating, ventilation, air conditioning) system of indoor environments no matter for offices, homes, or gyms to increase air circulation. Thus, accessing data on the CO2 level is important for humans to detect potential problems. When sufficient scientific data are available, we will know what actions to take under different circumstances more effectively.

This is a digital CO2 concentration sensor based on NDIR (nondispersive infrared), which can continuously collect and calculate the CO2 concentration in the air per unit volume and output in the form of a universal interface. It's designed to adopt PTFE film combined with a protective enclosure, improving its breathable performance. It is more accurate, stable, reliable, low-power consumption, and user-friendly. It compacts in size and can be easily integrated into various application scenarios.

This digital NDIR CO2 concentration sensor supports MODBUS RS485 serial communications, SDI-12 communication protocols, and is compatible with the wide power supply voltage of 5-16V. It has a built-in calibration functionality and can be widely applied in both indoor and outdoor environments. This product also adopts both single-air-chamber and double-channel.

Features:

High performance: high accuracy, fast response, and superior stability
support MODBUS RS485 and SDI-12
Compact size, best performance-to-price ratio
User-friendly: fully-calibrated, easy to install and integrate
Wide-range Power Supply: 5V ~ 16V
Wide Range & High Accuracy: 400ppm ~ 5,000 ppm, ± (50ppm+5%*MV)

Specifications:

CO2
Range	400~5000 ppm
Accuracy	± (50ppm+5%*MV)(in 400~3000ppm)
Resolution	1 ppm
General Parameters
Product Model	SOLO CO2 5000
Interface	RS-485
Protocol	MODBUS-RTU RS485/ MODBUS-ASCII RS485/ SDI-12 (v1.4)
Response Time (T90)	<5 minutes for 90% step change typical
IP Rating	IPx5 (the PTFE filter is not waterproof)
Operating Temperature	-10 ~ +50 °C
Operating Humidity	0 ~ 85% (non-condensing)
Cable Length	2 meters
Probe Dimensions	110 * 50 * 35 mm
Device Weight	300g
MODBUS RS-485
Power Supply	5V ~ 16V
Current Consumption	Vin=16V; 22mA (typical) Vin=12V; 28mA (typical) Vin=9V; 34mA (typical) Vin=5V; 57mA (typical)
Warm-up Time	120s (typical)
Scan Interval	1s
Poll Rate	1Hz
Response Time	≤ 4ms
SDI-12
Power Supply	5V ~ 16V
Current Consumption (Sleep Mode)	Vin=16V; 28mA (typical) Vin=12V; 29mA (typical) Vin=9V; 30mA (typical) Vin=5V; 35mA (typical)
Current Consumption(Active Mode)	Vin=16V; 20mA (typical) Vin=12V; 27mA (typical) Vin=9V; 33mA (typical) Vin=5V; 55mA (typical)
Warm-up Time	15ms
Scan Interval	120s (typical)