NBL-W-CO2 Carbon Dioxide (CO2) Sensor & Transmitter

The NiuBoL NBL-W-CO2 Carbon Dioxide Sensor is designed for continuous measurement of CO2 concentration in greenhouses, office buildings, public spaces, production facilities and environmental monitoring systems.

Two measurement ranges are available: 0–2000 ppm for general indoor and greenhouse monitoring, and 0–5000 ppm for applications requiring a wider CO2 concentration range.

The sensor is available with RS485 Modbus RTU or 4–20 mA output, allowing direct integration with PLCs, greenhouse controllers, environmental data loggers, RTUs and IoT gateways.

NBL-W-CO2 CO2 Sensor Technical Specifications

0–2000 ppm vs 0–5000 ppm CO2 Sensor

The NBL-W-CO2 is available in two measurement ranges. The corresponding accuracy specification differs between the two versions, so the required range should be selected according to the expected CO2 concentration at the installation site.

A wider measurement range is not automatically better. Select the range according to the expected operating concentration and the measurement requirements of the project.

What Does a CO2 Sensor Measure?

The NBL-W-CO2 measures the concentration of carbon dioxide in the surrounding air and reports the value in parts per million (ppm).

The CO2 sensor provides the concentration measurement. Functions such as ventilation control, CO2 supplementation, alarms or equipment switching are implemented by the connected greenhouse controller, PLC, data logger or building-management system.

CO2 Sensor for Greenhouse Monitoring

Carbon dioxide is one of the environmental parameters that can be monitored in controlled greenhouse cultivation. The NBL-W-CO2 can provide continuous CO2 concentration data for greenhouse climate-management systems.

The appropriate CO2 target depends on crop species, growth stage, ventilation conditions, light level and cultivation strategy. The sensor provides measurement data rather than determining a universal greenhouse CO2 setpoint.

CO2 Monitoring for Offices and Buildings

In offices, classrooms and other occupied indoor spaces, CO2 concentration can be used as one input for evaluating ventilation conditions and occupancy-related indoor air quality.

RS485 Modbus or 4–20 mA: Which Output Should You Choose?

4–20 mA CO2 Sensor Conversion Formula

The 4–20 mA output is scaled according to the selected CO2 measurement range.

Where C is the CO2 concentration in ppm and I is the measured current in mA.

Example: 0–5000 ppm Version

If the output current is 12 mA:

(12 − 4) / 16 × 5000 = 2500 ppm

Example: 0–2000 ppm Version

If the output current is 12 mA:

(12 − 4) / 16 × 2000 = 1000 ppm

RS485 Modbus Communication

RS485 CO2 Data Example

For a sensor with device address 01, a real-time data request can use:

01 03 00 00 00 01 84 0A

Example response:

01 03 02 01 B4 B9 A3

NBL-W-CO2 Wiring

Wiring note: Confirm the ordered output configuration and the cable identification supplied with the sensor before installation.

NBL-W-CO2 Dimensions

The sensor uses a multi-plate ventilated enclosure suitable for fixed environmental monitoring installations.

CO2 Sensor Installation Guidelines

CO2 Monitoring System Integration

NBL-W-CO2 → RS485 / 4–20 mA → Data Logger / PLC → 4G / Ethernet / LoRaWAN → Cloud or Private Server

Typical NBL-W-CO2 Applications

CO2 Sensor Maintenance and Troubleshooting

NBL-W-CO2 Carbon Dioxide Sensor FAQ

Q1. What does the NBL-W-CO2 measure?

A1. The NBL-W-CO2 measures carbon dioxide concentration in air and reports the result in ppm.

Q2. What CO2 measurement ranges are available?

A2. Two standard ranges are available: 0–2000 ppm and 0–5000 ppm.

Q3. What is the difference between the 2000 ppm and 5000 ppm versions?

A3. The main differences are measurement range and accuracy specification. The 2000 ppm version is specified at ±(40 ppm + 2% F.S.), while the 5000 ppm version is specified at ±(50 ppm + 3% of reading).

Q4. Does the sensor support RS485 Modbus?

A4. Yes. The RS485 version supports Modbus RTU with a default baud rate of 9600 bps.

Q5. Is a 4–20 mA CO2 transmitter available?

A5. Yes. The NBL-W-CO2 is available with 4–20 mA output for industrial analog-input systems.

Q6. Can the NBL-W-CO2 be used in a greenhouse?

A6. Yes. It can continuously monitor greenhouse CO2 concentration and provide data to a greenhouse controller, logger or IoT platform.

Q7. Can the sensor automatically control CO2 supplementation?

A7. The sensor provides the CO2 measurement. Automatic CO2 supplementation requires a compatible controller, PLC or data logger with control outputs and configured control logic.

Q8. Can the sensor control office ventilation?

A8. The sensor can provide CO2 concentration data to a compatible HVAC or building-management controller. The controller can then use the measurement as part of its ventilation-control logic.

Q9. Can several CO2 sensors share one RS485 network?

A9. Yes. Each RS485 sensor can be configured with a suitable device address, provided the RS485 bus, power supply and polling interval are correctly designed.

Q10. Can CO2 data be uploaded to our own server?

A10. Yes. The RS485 sensor can connect to a compatible data logger or IoT gateway, which can transmit CO2 measurements to a cloud platform or private server using supported communication protocols.

NBL-W-CO2 Datasheets

NBL-W-CO2-Carbon-Dioxide-Sensor-Instruction-Manual-2000ppm.pdf

NBL-W-CO2-Carbon-Dioxide-Sensor-Instruction-Manual-5000ppm.pdf

NBL-W-CO2 for Greenhouse, Building and IoT Monitoring

The NBL-W-CO2 Carbon Dioxide Sensor provides continuous CO2 concentration measurement with 0–2000 ppm and 0–5000 ppm range options. RS485 Modbus and 4–20 mA outputs allow integration with greenhouse controllers, PLC systems, environmental data loggers and remote IoT monitoring networks.

For quotation and model selection, specify the required CO2 range, output signal, power supply, cable length, quantity, installation environment and the controller or data logger that will receive the CO2 measurements.