As the country attaches great importance to the environmental protection industry, the nitrogen oxide online monitoring system has become the "guest" of many industrial enterprises ". So how does the nitrogen oxide online monitor monitor monitor?

The key component of the nitrogen oxide gas detector is the gas sensor. Gas sensors can be divided into three categories in principle:

1. gas sensors using physical and chemical properties: such as semiconductor type (surface control type, volume control type, surface potential type), catalytic combustion type, solid heat conduction type and so on.

2. Gas sensors using physical properties: such as heat conduction type, optical interference type, infrared absorption type, etc.

3. Gas sensors using electrochemical properties: such as constant potential electrolysis, Gawani battery, diaphragm ion electrode, fixed electrolyte, etc.

The nitrogen oxide exhaust produced in industrial production is the 1 harmful gas, especially harmful to the human body and the atmosphere, and is the main factor of photochemical smog and acid rain. Nitrogen oxide online monitoring equipment can effectively monitor the emission of nitrogen oxides, thereby reducing accidents, so it is widely used in boilers, thermal power plants, petrochemical products, rubber products and pharmaceutical products.

in use, the nitrogen oxides (NOx) on-line monitoring system must run for 10 to 20 minutes before it can be put into operation and then calibrated. In the calibration process, close the sampling port of the three-way valve, open the calibration port, and input the calibration gas to calibrate the equipment. Only after calibration and calibration, the equipment can officially work.

The gas to be measured extracted by the nitrogen oxide online monitor is filtered by the probe particle filter element, and then collected through the pretreatment pipeline inside the equipment collected by the sampling pipeline. After being condensed by the pretreatment condenser, the moisture in the flue gas is passed through The peristaltic pump is discharged into the water storage tank.

The gas to be measured after condensation and water removal passes through the particle filter to remove tiny particles in the flue gas, and then passes through the first air chamber, the second air chamber and the third air chamber through the pressure regulating valve.The pretreated gas enters the permeable membrane of the NO/NO2/O2 sensor to reach the surface of the sensitive electrode, reacts with oxidation or reduction on the sensitive electrode, and reacts with oxidation and oxidation on the counter electrode, and generates a limiting diffusion current. The data is processed and calculated by the data acquisition unit, displayed and stored by the software, and transmitted to the monitoring platform through GPRS to complete the online monitoring of nitrogen oxides.