Leading Precision Environmental Protection: Nexisense Full-Scenario Gas Detection Solutions for Atmospheric Environment Monitoring

With the global industrialization process and the advancement of carbon peak and carbon neutrality goals, atmospheric environment monitoring has shifted from mere "pollution control" to "refined management." Whether it's grid-based monitoring on city streets or boundary early warning in industrial parks, real-time detection of trace gases in the atmosphere has become essential.

Nexisense, a pioneer in environmental monitoring, leverages cutting-edge sensor technology and system integration capabilities to provide industry-wide full-stack solutions from core modules to terminal systems.

Emerging Trends in Smart Environmental Protection: Rise of Grid-Based and Refined Monitoring

Traditional atmospheric monitoring stations (national control stations) are precise but large, costly, and sparsely deployed, making comprehensive coverage of city "microenvironments" challenging.

Necessity of Grid-Based Monitoring

By deploying high-density monitoring points, management authorities can obtain real-time air quality index (AQI) data for different regions. Nexisense solutions aim to fill the gaps between large monitoring stations using low-power, highly reliable micro monitoring stations, achieving full coverage of city streets, communities, and construction sites, and accurately locating pollution sources.

Boundary and Pollution Source Online Monitoring

For chemical parks and manufacturing enterprises, boundary atmospheric monitoring is key to fulfilling environmental responsibilities and mitigating emission risks. By deploying high-precision detection systems along enterprise perimeters, Nexisense enables 24/7 monitoring of fugitive emissions, ensuring VOCs and odorous gases do not exceed allowable limits.

Core Technology: The Power of PPB-Level High-Precision Sensors

Target gas concentrations in the atmosphere are often at trace levels (PPB-level, parts per billion). Standard industrial sensors cannot meet such stringent resolution requirements.

Nexisense SGA-700 Series: Benchmark for Smart Sensor Modules

Our core product, the SGA-700 series intelligent high-precision gas sensor module, acts as the "brain" of precise monitoring with the following features:

• PPB-level resolution: sensitively detects minute fluctuations in air concentrations.

• Intelligent calibration algorithm: built-in temperature and humidity compensation effectively addresses drift caused by environmental changes.

• Plug-and-play design: modular structure reduces maintenance costs; users can replace sensors on-site without returning them to the factory.

• Multi-signal output: supports RS485, 0-5V, 4-20mA protocols for easy integration into existing atmospheric monitoring equipment.

  
  

Full Parameter Coverage: From Conventional Six Parameters to Specialized Gas Monitoring

A complete atmospheric monitoring solution must cover both physical environment parameters and chemical gas indicators. Nexisense systems offer flexible configuration to meet industry-specific needs.

Conventional Air Quality Parameters

• Gaseous pollutants: Carbon Monoxide (CO), Sulfur Dioxide (SO2), Nitrogen Dioxide (NO2), Ozone (O3)

• Particulate matter: PM2.5, PM10

• Meteorological five parameters: wind speed, wind direction, temperature, humidity, atmospheric pressure

Targeted Specialized Gas Monitoring

• Volatile Organic Compounds (VOCs/TVOC): high-lifespan PID photoionization sensors support non-methane hydrocarbons, benzene, toluene, xylene, etc.

• Toxic and hazardous gases: Ammonia (NH3), Hydrogen Sulfide (H2S), Chlorine (Cl2), Hydrogen Chloride (HCl)

• Residential/indoor environment: Formaldehyde (HCHO), Carbon Dioxide (CO2), Oxygen (O2)

• Odor index: OU odor value monitoring

Industry Application Scenarios: Broad Practice of Nexisense

Nexisense atmospheric monitoring technology has been validated in multiple high-standard, high-requirement fields, serving top research institutions and renowned enterprises.

1. Industrial parks and petrochemical industry: In large petrochemical bases, Nexisense systems enable full perimeter coverage. VOC monitoring systems can promptly alert at the early stage of leakage to prevent pollution spread.

2. Research and education institutions: Huawei, National University of Defense Technology, and Xi'an Jiaotong University use Nexisense high-precision modules for atmospheric chemistry research or smart city projects, demonstrating excellent data consistency, linearity, and repeatability.

3. Telecom and operator integration solutions: In smart city projects, Jiangxi Telecom deploys Nexisense monitoring terminals on smart lampposts or communication base stations, achieving low-cost, large-scale environmental data collection, providing foundational data support for smart city cloud platforms.

Technical Advantages: Why Choose Nexisense?

• Data precision and stability: Imported high-performance probes combined with domestic algorithm optimization prevent sensor poisoning in high pollution environments and false negatives in low concentration environments. Multi-stage filtering eliminates electromagnetic interference, ensuring pure signal transmission.

• Rapid response and real-time feedback: Sudden emissions often last only a few minutes. Nexisense sensor modules feature extremely short response times (T90 < 20s), capturing peak values for emergency response.

• Strong compatibility and scalability: Supports seamless integration via Modbus RTU RS485 or wireless networks (GPRS/4G/5G), and can extend to cloud platforms. Users can view historical trends and reports via mobile apps or PC dashboards.

  
  

FAQ: Frequently Asked Questions

Q1: Why must PPB-level resolution be emphasized in urban grid-based monitoring rather than conventional PPM-level?

A1: Gaseous pollutants in urban air (e.g., SO2, NO2, O3) are typically extremely low, usually only a few to tens of PPB. PPM-level sensors (minimum resolution 0.1ppm or 1ppm) cannot capture subtle fluctuations, resulting in "zero" or jumping readings. Nexisense SGA-700 series modules achieve 1ppb or lower resolution, enabling refined management, AQI calculation, and pollution source tracing.

Q2: How does Nexisense solve the "temperature drift" issue of electrochemical sensors in atmospheric monitoring?

A2: Electrochemical sensors are extremely sensitive to temperature changes, which affect electrolyte activity and reaction rates. Nexisense uses dual physical and algorithm compensation: high-precision temperature sensors monitor the microenvironment, and SGA-700 intelligent chips apply real-time nonlinear compensation, ensuring stable data from -40°C to 50°C.

Q3: For VOC monitoring, what are the advantages of PID photoionization sensors compared with GC-FID technology?

A3: GC-FID is a laboratory-grade method, highly accurate but expensive, bulky, and requires hydrogen cylinders. In contrast, Nexisense high-lifespan PID sensors are compact, respond in seconds, require no auxiliary gases, and enable continuous monitoring. PID provides real-time detection for boundary early warning and fugitive emission monitoring. For qualitative analysis, PID can be combined with portable GC-MS for sampling, creating a closed-loop monitoring system.

Q4: How is measurement accuracy ensured when multiple interfering gases (e.g., O3 affecting NO2) exist?

A4: Cross-interference is a technical barrier for environmental sensors. Nexisense applies a “physical filtering + differential compensation” approach. Selective filtering membranes block interferents, and multi-parameter monitoring systems use algorithms (e.g., simultaneous ozone measurement during NO2 monitoring) to mathematically isolate target gas concentration, effectively reducing false positives.

Q5: How does Nexisense ensure seamless compliance with HJ 212-2017 protocol?

A5: Data acquisition devices fully comply with HJ 212-2017 for online pollution source monitoring. Systems support RS485 or RJ45 interfaces with breakpoint resume to prevent data loss. Users configure parameter codes, device ID, and server IP to automatically upload monitoring data to provincial, municipal, and county-level environmental platforms.

Q6: How does Nexisense address sensor zero drift?

A6: Long-term use can cause zero offset due to electrode polarization, electrolyte depletion, or lamp contamination. Nexisense supports remote zero calibration and software alignment. Cloud connectivity allows remote commands for calibration, and automatic physical sampling with zero air or purified air ensures reference accuracy.

Q7: How are sensors protected against corrosion and condensation in coastal or high-humidity environments?

A7: SGA-700 modules are coated with triple-protection paint for strong salt-fog resistance. Optional dehumidifiers or heated sampling pipelines prevent condensation before gas enters the sensor chamber, protecting sensor life and ensuring accurate readings.

Q8: What are the maintenance advantages of intelligent modules over traditional analog probes?

A8: Intelligent modules digitally store calibration data, range, sensitivity, and coefficients. On-site replacement is as easy as changing a light bulb; the system automatically recognizes the module and reads parameters, eliminating recalibration and reducing operational costs for large monitoring networks.

Summary

Nexisense atmospheric environment monitoring solutions integrate chemical sensing technology with IoT communication protocols, emphasizing the critical importance of PPB-level precision. With high-precision sensors, rigorous temperature and humidity compensation, and standardized protocol compliance, Nexisense provides industrial parks, smart cities, and research institutions with reliable and accurate data foundations.