Practical Application of Nexisense NO₂ and SO₂ Sensors in Industrial Emission Monitoring

With ongoing industrialization, industrial emissions have become a major factor affecting air quality and public health. Fuel combustion, chemical production, and metallurgical processes emit NO₂, SO₂, and other pollutants, making monitoring and control a critical part of environmental management.

Among these pollutants, NO₂ and SO₂ are not only emitted in large quantities but also pose significant environmental and health risks, making them key targets for online industrial monitoring systems.

Sources and Challenges of Industrial Emissions

• Combustion equipment: boilers, furnaces, etc.

• Chemical reactions and metallurgical processes

• Raw material storage and product processing

Common pollutants include carbon, sulfur, fluorine compounds, nitrogen oxides, and particulate matter. Exposure can cause acute irritation and, over time, cumulative damage to the respiratory and cardiovascular systems. With increasingly strict environmental regulations, measuring, recording, and tracing emissions has become essential for regulatory compliance.

Environmental and Health Impacts of NO₂ and SO₂

NO₂ Risks

• Typical irritant gas, mainly from high-temperature combustion

• Irritates respiratory mucosa

• Can trigger or worsen asthma and bronchitis

• Participates in photochemical reactions forming ozone and secondary pollutants

SO₂ Risks

• From sulfur-containing fuel combustion and metallurgical processes

• Strong irritant to the respiratory system and eyes

• Long-term exposure may cause chronic respiratory diseases

• Major precursor of acid rain

Therefore, real-time monitoring of NO₂ and SO₂ is indispensable in industrial emission control systems.

Typical Challenges in Online Industrial Monitoring Systems

• Use of multiple individual instruments, consuming space and increasing costs

• Complex system integration and maintenance

• Limited scalability

• Extensive calibration and maintenance efforts

The trend toward multi-parameter integrated monitoring favors standardized, modular sensor modules, offering cost-effectiveness and flexibility.

Overview of Nexisense SGA-400/700 Intelligent NO₂ and SO₂ Sensor Modules

The SGA-400/700 series is a modular, standardized solution for industrial and environmental online monitoring, covering NO₂, SO₂, and other common gases. It addresses compatibility, calibration, and component replacement challenges through simplified integration design.

Detection Principles and Technical Advantages

• High-quality sensing element: imported NO₂ and SO₂ sensors with high selectivity and stability for reliable long-term monitoring

• Intelligent signal processing: amplification, filtering, digitization, and internal algorithms for high precision and interference resistance

• Full-range temperature and humidity compensation: real-time correction with three-point algorithm ensures consistent results under varying conditions

• Factory-calibrated: ready to use without additional calibration

System Integration and Interface Advantages

• 0–5 V analog voltage output

• TTL digital signal output

• Direct connection to PLC, DCS, DDC, and data acquisition systems

• Facilitates multi-gas integrated monitoring and future expansion

Typical Application Scenarios

• Online industrial emission monitoring systems

• Continuous flue gas monitoring

• Chemical park environmental monitoring

• Grid-based atmospheric monitoring instruments

• Micro air quality monitoring stations

• Research and data acquisition platforms

The sensor modules provide reliable data for emission assessment, process optimization, and environmental decision-making.

Value for Companies and System Integrators

• Reduces R&D and production costs

• Shortens development and delivery timelines

• Improves system stability and consistency

• Enhances overall solution competitiveness

• Modular, standardized design is becoming mainstream in environmental monitoring

  
  

Frequently Asked Questions (FAQ)

1. Why focus on NO₂ and SO₂? They are high-emission, high-risk pollutants and core regulatory indicators.

2. Does the SGA-400/700 require on-site calibration? No, factory-calibrated and ready to use.

3. Is it suitable for continuous online monitoring? Yes, designed for industrial stability and reliability.

4. Supports multi-gas monitoring? Yes, allows unified system design.

5. Sensitive to environmental changes? Built-in compensation algorithms minimize impact.

6. Compatible with existing platforms? Yes, supports standard signal outputs.

7. High maintenance cost? Low, reduces frequent calibration and replacement.

8. Limited to industrial emissions? No, also applicable to research, environmental, and IoT applications.

Summary

In the context of increasingly precise industrial emission control and environmental regulation, Nexisense SGA-400/700 intelligent NO₂ and SO₂ sensor modules provide reliable, high-performance, and easily integrated solutions. Real-time, accurate monitoring of NO₂ and SO₂ helps companies comply with emission standards while supporting environmental improvement and sustainable development.