Fixed NO2 Preprocessing Online Monitoring System
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Model: HNAG1000-NO2
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Detection: NO2 (Nitrogen Dioxide)
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Detection Principle: Electrochemistry, For Flue Gas Applications
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Detection range: 0-1ppm, 0-20ppm, 0-2000ppm
Product Description
High-Precision NO2 Preprocessing Online Monitoring System
The HNAG1000-NO2 Preprocessing Online Monitoring System is specially engineered for the continuous, real-time detection of Nitrogen Dioxide (NO2) concentration and leakage, particularly optimized for flue gas applications and severe industrial environments. By integrating a high-performance electrochemical sensor with advanced microcontroller technology, this system delivers an exceptionally fast response speed (T90 < 10s), high measurement accuracy (±3% F.S.), and outstanding repeatability. Utilizing an explosion-proof wiring method, the device is fully certified for hazardous locations and integrates seamlessly with PLCs, DCS, and standard control alarm systems.
Robust Stainless Steel Design & Gas Sampling Mechanism
Encased in a heavy-duty stainless steel cabinet, the monitoring system relies on a meticulously engineered continuous gas sampling process. The extracted NO2 gas first passes through a high-efficiency filter to strictly remove dust, particulates, and impurities. A dedicated sampling pump then directs the sample into a precision flowmeter, maintaining the incoming gas flow rate securely between 0.3 and 0.5 L/Min. This regulated pretreatment guarantees that the electrochemical sensor operates under optimal conditions before the gas is exhausted safely.
Technical Specifications of Nitrogen Dioxide Monitor
| Parameter | Technical Specification |
| Monitored Gas |
NO2 (Nitrogen Dioxide) |
| Detection Principle |
Electrochemistry, For Flue Gas Applications |
| Measurement Ranges |
0-1ppm, 0-20ppm, 0-2000ppm |
| Resolution |
0.001ppm, 0.01ppm, 1ppm |
| Sampling Accuracy |
±3% F.S. |
| Response Time |
T90 < 10s |
| Standard Output Signals |
4-20mA (12-bit precision, 1Km distance), RS485 (MODBUS RTU, 1Km), Passive contact relays (220VAC 3A / 24VDC 3A) |
| Optional Output Signals |
Voltage (0.4-2V, 0-5V, 0-10V), Wireless (GPRS, 4G, WIFI, LORA, ZigBee) |
| Operating Environment |
Temperature: -20 ～ 50℃; Humidity: 0-95%RH |
| Sampling Distance |
Up to 80 meters (Recommended within 20 meters) |
| Power Supply |
220V AC |
Industrial Applications & Flange Installation
This continuous NO2 monitoring system is an essential safety component deployed widely in thermal power plants, boiler rooms, garbage treatment plants, smelters, chemical processing plants, and environmental monitoring stations. The system is designed to support standard pipeline flange installations and wall-mounted setups, ensuring secure, leak-proof sampling directly from flue gas exhaust stacks or process pipelines.
Customized Gas Pretreatment Configurations
To accommodate the specific challenges of flue gas monitoring and complex plant conditions, multiple tailored internal configurations are available:
1.Normal to Medium Temperatures: Configurations equipped with condensation units and timed peristaltic drainage pumps, ideal for negative-pressure pipelines and moisture-heavy extraction.
2.High-Temperature Flue Gas (400-800°C): Advanced systems integrating vortex flow cooling coils, dual filtration, and automatic time-relay solenoid valves for pipeline reverse-purging to prevent filter clogging from heavy ash.
3.Explosion-Proof Pneumatic Setup: Highly recommended configurations utilizing pneumatic pumps driven by plant compressed air and full stainless-steel pipelines to ensure maximum safety in highly combustible zones.
Frequently Asked Questions (FAQ)
Q: What is the expected service life of the electrochemical NO2 sensor?
A: The electrochemical NO2 sensor is a consumable component with a typical operational service life of approximately 1 to 3 years. The actual duration depends on the specific detection environment, background flue gases, and target gas exposure levels.
Q: What routine maintenance does the sampling system require?
A: You must replace the internal filter when the color of its core chip changes, which typically happens every 3 months under standard industrial testing environments. Additionally, if the unit is operating between -20°C and 60°C without an automatic drainage configuration, the water produced by the filter must be manually drained. The sampling air pump generally requires replacement after approximately one year of continuous use.
Q: How are alarm thresholds managed?
A: The standard system configuration features a two-level threshold alarm, with an optional three-level alarm structure available. When triggered, the system can activate on-site sound and light alarms, external ventilation devices via relay switches, remote controllers, and instantly notify computer data acquisition software.
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