Main technical requirements for gas boiler exhaust gas detector
1、 Overall requirements:
1. Complies with the relevant provisions of the Technical Specification for Continuous Monitoring of Fixed Pollution Source Smoke (SO2, NOX, Particulate Matter) Emissions (HJ 75-2017).
2. Comply with the relevant provisions of the Notice on Carrying out Nitrogen Oxide Treatment of Gas Boilers
2、 Technical requirements
For boilers under ten tons, nitrogen oxide emissions are 30mg/M
Quantity of nitrogen oxide tail gas analyzer: 1 unit
(1) Real time monitoring of nitrogen oxide content in flue gas and the ability to save emission monitoring data for one year
(2) Imported high-performance sensors with full range temperature digital automatic tracking compensation, strong anti-interference performance, sensor lifespan>1 year (measured by 24-hour continuous monitoring);
(3) Automatic temperature compensation, zero point, and full-scale drift compensation;
(4) Automatic protection function against high concentration gas impact;
(5) Full software calibration function, users can also calibrate themselves;
(6) Explosion proof rating: The equipment must meet the explosion-proof safety requirements of the installation site;
(7) Independent chamber, no need for on-site calibration when replacing sensors, automatic identification of key sensor parameters;
(8) Having a CPA certificate (Certificate of Approval for Measuring Instrument Type).
3、 Equipment List
Nitrogen oxide exhaust gas detector: 1 unit
4、 Acceptance requirements
1. Gas boilers should be equipped with nitrogen oxide tail gas analyzers, and on-site inspections should be able to provide emission monitoring data for at least one year.
2. Meet the relevant provisions of the online monitoring equipment acceptance standard DB13/1642.2 Technical Requirements (Trial).
3. After the installation and debugging of the over limit alarm sensing device, the portable detection instrument is used to compare and confirm the on-site detection data
4. The equipment must meet the explosion-proof requirements of the corresponding level for safe use on site (provide proof of explosion-proof level).

2、 Product Features
（1） Monitoring function, 24-hour real-time monitoring of nitrogen oxide emissions from boilers, smoke windows, low nitrogen burners and other related equipment.
（2） Analysis function, built-in imported high-precision NOx analysis module, accurately and precisely analyzes the composition of nitrogen oxides to ensure data accuracy.
（3） Multiple transmission methods, supporting both wireless and wired transmission.
（4） Upload function, built-in 212 protocol can directly upload to the environmental protection platform. And equipped with multiple signal options such as digital signal 485 and analog signal 4-20mA.
（5） Storage function, with built-in super large storage function, data can be stored for 2-5 years.
（6） Display function, 8-inch LCD display real-time display of detection data and analysis data.
3、 Product Features
（1） All core components are imported equipment, which ensures the accuracy of the instrument and enhances its anti-interference ability.
（2） Compact design, small external dimensions, and less footprint.
（3） The carbon steel shell design that is dustproof, rainproof, and lightning resistant can face challenges even in harsh environments.
（4） Anti oxidation coating design effectively enhances its corrosion resistance.
（5） Supports various installation methods such as cabinet mounted and wall mounted.
（6） Easy to install, one person can also install.

Detection principle: electrochemistry
Gas type: Nitrogen oxides (NOx)
Sampling method: pump suction
Gas range 0-200mg/m3
Accuracy ≤ ± 3% FS
Resolution 0.1mg/M3
Repeatability ≤± 2% F S
Zero drift ≤± 2% FS/12h
Span drift ≤± 3% FS/12 h
Response time T90<30s
Output signal RS485 digital signal (data acquisition instrument, detection system software, PLC controller);
4-20mA analog signal (data acquisition instrument, detection system software, PLC controller)
212 Wireless Transmission (Exclusive for Environmental Protection Bureau)
Contact capacity 24VDC/1A
Control the output of two passive normally open contacts
7-inch LCD touch display screen
Environmental temperature: -10 ℃~+55 ℃ (customized for special requirements)