High Concentration CO2 Sensor for Gas Monitoring

Key Features

High concentration CO2 measurement range: 0–100 vol%
Thermal conductivity CO2 sensing technology
Integrated Sensirion STC31-C gas concentration sensor
Designed for CO2 measurement in air or nitrogen
CO2 resolution: 0.01 vol%
Forced calibration point accuracy: ±0.5 vol% under specified conditions
Fast sensor response: approximately 0.5 s without filtering
Integrated temperature, humidity and dew point measurement
Temperature and humidity compensation
Optional RS485 Modbus RTU or SDI-12 V1.3 communication
Automatic and forced calibration support
Adjustable CO2 filtering strength
Low-power measurement options
5–28 V DC power supply
Compact wall-mounted design, IP50 protection
OEM and ODM customization available

Product Description

1. Product Overview

The JWGas-CDF(Z17) High Concentration CO2 Sensor is designed for monitoring carbon dioxide concentrations from 0 to 100 vol% in air or nitrogen environments.

Unlike conventional low-range CO2 sensors commonly used in indoor air quality and greenhouse monitoring, this high range CO2 sensor supports applications requiring percentage-level carbon dioxide measurement.

The sensor incorporates a Sensirion STC31-C thermal conductivity sensing element with integrated temperature and humidity compensation.

Available with RS485 Modbus RTU or SDI-12 V1.3 output, it can connect to compatible industrial controllers, environmental data loggers and remote monitoring systems.

Typical applications include controlled atmosphere monitoring, laboratory gas measurement, storage environment monitoring and industrial gas concentration data acquisition.

2. How Does a Thermal Conductivity CO2 Sensor Work?

A thermal conductivity CO2 sensor measures changes in the thermal conductivity of a gas mixture.

Carbon dioxide has different thermal conductivity characteristics from common background gases, including nitrogen and oxygen. Changes in gas composition affect heat transfer at the sensing element, allowing the sensor to estimate CO2 concentration using an appropriate gas model.

The integrated Sensirion STC31-C supports high concentration CO2 measurement in air or nitrogen.

Advantages of Thermal Conductivity Measurement

Suitable for percentage-level CO2 concentration measurement
Compact sensing element
Low power consumption
Fast response under specified measurement conditions
Digital signal processing and filtering
Supports calibration and compensation

Important: Thermal conductivity measurements depend on the background gas composition. Users should select the correct gas model and verify calibration requirements when the gas mixture differs from the specified air or nitrogen conditions.

For additional technical information, refer to the Sensirion STC31-C product documentation.

thermal-conductivity-co2-sensor-working-principle

3. Technical Specifications

Parameter	Specification
Model	JWGas-CDF(Z17)
Measurement Gas	CO2 in air or nitrogen
Measurement Principle	Thermal conductivity
Sensing Element	Sensirion STC31-C
CO2 Measurement Range	0–100 vol%
CO2 Resolution	0.01 vol%
Forced Calibration Point Accuracy	±0.5 vol% under specified conditions
Response Time	0.5 s without filtering (sensor-level specification)
CO2 Noise, No Filtering	±0.32 vol%
CO2 Noise, Strong Filtering	±0.07 vol%
Temperature Measurement Range	-40 to +125°C
Long-Term Operating Temperature	-40 to +80°C
Temperature Resolution	0.01°C
Typical Temperature Accuracy	Up to ±0.2°C
Relative Humidity Range	0–100% RH
Humidity Resolution	0.01% RH
Typical Humidity Accuracy	Up to ±1.8% RH
Working Environment	-40 to +80°C, 0–95% RH, non-condensing
Output Options	RS485 Modbus RTU / SDI-12 V1.3
Power Supply	5–28 V DC
Protection Rating	IP50
Installation	Wall-mounted
Standard Cable	2 m
Maximum Custom Cable	5 m
Sensor Body Size	111 × 25.5 mm

Digital CO2 sensor for air and nitrogen measurement

Note: Sensor-element specifications and complete-device specifications are not interchangeable. CO2 measurement accuracy depends on calibration, gas composition, temperature, humidity and pressure. The temperature measurement range is not the permissible operating range of the complete device.

4. High Concentration CO2 Sensor vs Conventional CO2 Sensor

Selecting the correct CO2 measurement range is essential for reliable monitoring.

Feature	JWGas-CDF(Z17)	JWGas-CD(Z19)
Main Application	High concentration CO2 monitoring	Greenhouse and environmental monitoring
CO2 Range	0–100 vol%	0–5000 ppm
Measurement Principle	Thermal conductivity	Infrared
Typical Gas Environment	Air or nitrogen	Environmental air
Measurement Focus	Percentage-level CO2	Low concentration CO2
Digital Interface	RS485 / SDI-12	RS485 / SDI-12

A concentration of 1 vol% is equivalent to 10,000 ppm. Therefore, the 0–100 vol% measurement range is fundamentally different from a conventional 0–5000 ppm environmental sensor.

For greenhouse ventilation, agricultural CO2 monitoring or indoor environmental measurements, consider the CO2 Sensor 5000ppm RS485 SDI12 for Greenhouse.

high-range-vs-low-range-co2-sensor-comparison

5. Typical Applications

5.1 Controlled Atmosphere Storage

Controlled atmosphere storage systems may require carbon dioxide monitoring as part of managing gas composition.

The JWGas-CDF(Z17) can be considered for CO2 concentration measurement where the expected range and background gas composition are compatible with its sensing principle.

Actual suitability should be confirmed against the storage environment, gas composition and installation conditions.

controlled-atmosphere-storage-co2-monitoring

5.2 Cold Chain and Storage Environment Monitoring

Some cold chain and storage applications involve modified or controlled atmospheres.

The high range CO2 sensor provides a measurement option where percentage-level CO2 concentrations must be recorded.

For these applications, installation protection, condensation and calibration conditions must be evaluated before deployment.

5.3 Laboratory Gas Concentration Measurement

Research laboratories and testing facilities may require CO2 measurements in controlled gas mixtures.

The sensor supports measurement in air or nitrogen with configurable gas model settings and calibration functions.

Users should verify measurement uncertainty against the required experimental conditions.

5.4 Industrial Gas Monitoring

Industrial processes may involve elevated carbon dioxide concentrations requiring continuous or periodic measurement.

With RS485 Modbus RTU communication, the sensor can transmit measurement data to compatible controllers or data acquisition equipment.

The complete monitoring system should be designed according to the process environment and required measurement performance.

This device should not be treated as a certified personnel safety gas detector without appropriate product-level certification.

5.5 Remote Environmental Data Acquisition

The SDI-12 version is suitable for integration with compatible environmental data loggers.

Depending on the complete system configuration, measurements can be recorded locally or transmitted through an external communication gateway.

Explore additional monitoring instruments in the Ambient Sensors category.

6. RS485 Modbus and SDI-12 Integration

RS485 Modbus RTU Output

The RS485 option supports integration with compatible:

Industrial controllers and PLC systems
Data acquisition units
Industrial IoT gateways
Remote monitoring systems

The communication configuration and register mapping should be confirmed using the device protocol documentation.

SDI-12 V1.3 Output

SDI-12 is commonly used in environmental monitoring and low-power data acquisition systems.

The SDI-12 version can interface with compatible data loggers for scheduled measurement and data recording.

Remote Data Monitoring

A typical architecture may include:

High Concentration CO2 Sensor → Data Logger / IoT Gateway → Communication Network → Monitoring Platform

For multi-location monitoring, data acquisition and network transmission can be configured according to project requirements.

The Gas Detection Weather Station for Outdoor Air Pollution Monitoring provides an example of broader environmental monitoring integration, although its gas measurement ranges and sensing components differ from this high concentration sensor.

rs485-co2-sensor-iot-integration-architecture

7. Calibration and Measurement Considerations

The JWGas-CDF(Z17) supports automatic and forced calibration.

For reliable measurement:

Select the appropriate background gas model.
Confirm the expected CO2 concentration range.
Use a known and stable reference environment for forced calibration.
Allow for environmental compensation requirements.
Select filtering settings according to measurement stability and response needs.
Verify the installation environment against the device operating limits.

Calibration procedures and recalibration intervals should follow the applicable device documentation and operating conditions.

8. Installation Recommendations

The sensor uses a compact wall-mounted enclosure with IP50 protection.

For installation:

Install in a location representative of the target gas atmosphere.
Avoid condensation and direct liquid exposure.
Ensure the measurement environment stays within the rated operating conditions.
Follow the electrical connection and wiring instructions.
Protect the device from mechanical damage and unsuitable outdoor exposure.
Confirm whether an additional protective enclosure is required.

Gas sampling arrangement and exposure conditions should be reviewed according to the monitoring application.

high-concentration-co2-sensor-installation-diagram

9. Why Choose JW-IoT?

JW-IoT supports industrial monitoring projects requiring sensors, data acquisition and communication integration.

For high concentration CO2 monitoring applications, available support includes:

Sensor model and measuring range selection
RS485 Modbus RTU and SDI-12 integration
Data logger and communication interface matching
OEM and ODM customization
Cable and interface configuration
Project-oriented technical documentation

System integrators and distributors can contact JW-IoT to discuss gas monitoring requirements and compatible equipment.

10. Request Technical Specifications and a Quotation

Looking for a 0–100% CO2 sensor with RS485 Modbus RTU or SDI-12 output?

Contact JW-IoT with your expected gas composition, CO2 concentration range, monitoring environment and communication requirements.

Our team can help you select a suitable sensor configuration and discuss OEM, ODM and integration requirements.

Contact JW-IoT

FAQ

Q

1. What does the JWGas CDF High Range CO2 Sensor measure?

A

JWGas-CDF(Z17) sensor measures high concentration carbon dioxide from 0 to 100 vol%, along with temperature, humidity, and dew point.
Q

2. Is this sensor suitable for normal indoor CO2 monitoring?

A

It can measure CO2, but it is mainly designed for high concentration CO2 applications. For typical indoor air quality monitoring around 400–5000 ppm, a lower-range CO2 sensor may be more suitable.
Q

3. Can JWGas-CDF(Z17) measure CO2 in nitrogen?

A

Yes. JWGas-CDF(Z17) supports CO2 measurement in nitrogen and air. Users should select the correct gas type setting before use to improve measurement accuracy.
Q

4. Does JWGas-CDF(Z17) support RS485 Modbus RTU?

A

Yes. JWGas-CDF(Z17) supports RS485 Modbus RTU, making it suitable for PLC systems, industrial IoT gateways, data acquisition units, and cloud monitoring platforms.
Q

5. Can JWGas-CDF(Z17) work with SDI-12 data loggers?

A

Yes. JWGas-CDF(Z17) supports SDI-12 V1.3, making it suitable for data loggers, remote environmental monitoring stations, and low-power field monitoring systems.
Q

6. What is the CO2 measurement resolution?

A

The CO2 resolution is 0.01 vol%, suitable for high concentration gas monitoring applications.
Q

7. Does the sensor support calibration?

A

Yes. JWGas-CDF(Z17) supports automatic calibration and forced calibration. Forced calibration should be performed in a known, uniform, and stable CO2 concentration environment.
Q

8. What is the response time of the CO2 measurement?

A

The response time is 0.5 seconds without filtering. Stronger filtering can provide smoother data but will slow down the response.
Q

9. Does JWGas-CDF(Z17) measure temperature and humidity?

A

Yes. JWGas-CDF(Z17) measures temperature, humidity, and dew point in addition to CO2 concentration.
Q

10. Is JWGas-CDF(Z17) suitable for battery-powered systems?

A

Yes. The SDI-12 request measurement mode has a static current of less than 50 μA at 12 V DC, making it suitable for low-power monitoring applications.
Q

11. What applications is this sensor best suited for?

A

It is suitable for high concentration CO2 detection, cold chain logistics, warehouse monitoring, controlled atmosphere storage, laboratory gas measurement, environmental monitoring, and industrial gas monitoring.
Q

12. Does JWGas-CDF(Z17) support OEM or ODM customization?

A

Yes. JWGas-CDF(Z17) supports OEM and ODM customization, including communication interface, cable length, labeling, gas type configuration, and system integration requirements.