1. Product Overview
The NOx Exhaust Gas Analyzer is designed for continuous and online monitoring of nitrogen oxides (NO, NO₂, NOx) and oxygen (O₂) in industrial exhaust gases.
It is widely used in emission monitoring, environmental compliance, pollution control process evaluation, and regulatory supervision.
Nitrogen oxides (NOx) are major air pollutants and key precursors of acid rain, photochemical smog, and ozone formation. Accurate real-time monitoring of NOx emissions is essential for both industrial operators and environmental authorities.
2. Measured Gases and Parameters
The analyzer can measure the following gases:
Nitric Oxide (NO)
Nitrogen Dioxide (NO₂)
Total Nitrogen Oxides (NOx, calculated)
Oxygen (O₂)
Measurement results are displayed in mg/m³, meeting industrial emission monitoring standards.
3. Working Principle
The analyzer is based on high-performance imported electrochemical sensors:
Sample gas is drawn into the analyzer by a pump
Electrochemical sensors convert gas concentration into electrical signals
Signals are processed with compensation algorithms to generate accurate readings
The analysis process requires no chemical reagents and produces no secondary pollution, making it suitable for long-term continuous operation.
4. Sampling and Pretreatment System
Gas Pretreatment
The system is equipped with a three-stage pretreatment unit:
Condensation for moisture removal
Dust filtration
Gas drying
This ensures stable measurement performance under harsh industrial conditions.
Measurement Control
Built-in temperature and humidity compensation
Cross-interference compensation between NO, NO₂ and O₂
Pump-suction sampling method
5. Key Features and Advantages
Electrochemical sensors with high accuracy and fast response
No reagents required, no secondary pollution
Three-stage gas pretreatment for industrial exhaust applications
Temperature and humidity compensation for stable results
Multi-gas interference compensation
Low maintenance, suitable for 24/7 online monitoring
6. Display, Data Storage and Communication
7.0-inch industrial touch screen with intuitive interface
Real-time display of gas concentration, gas type, units and operating status
Historical data storage for more than one year
Data query, statistical reports and data export supported
Multiple output interfaces:
4–20 mA
RS485
Ethernet
Relay alarm output
7. Technical Specifications
| Item | Specification |
| Target Gases | NO, NO₂, O₂, NOx (calculated value) |
| Detection Principle | Electrochemical Sensor |
| Sampling Method | Pump suction, suitable for long-term continuous operation |
| Measuring Range | NO: 0–100 mg/m³ (extendable, customizable)NO₂: 0–100 mg/m³ (extendable, customizable)O₂: 0–25 %VOL (extendable, customizable) |
| Resolution | 0.01 mg/m³ or 0.01 %VOL (customizable) |
| Repeatability | ≤ 2% |
| Linearity Error | ≤ ±3% FS |
| Response Time | ≤ 20 s |
| Dimensions | 800 × 400 × 400 mm |
| Power Supply | AC 220V |
8. Typical Applications
The NOx Exhaust Gas Analyzer is widely used in:
Boilers and combustion exhaust monitoring
Power plants, steel and metallurgical industries
Petrochemical and chemical plants
Waste incineration plants and cement factories
Industrial park centralized emission supervision
