Volatile Organic Comounds (VOCs) Online Monitoring System

Volatile Organic Comounds (VOCs) Online Monitoring System

Volatile Organic Comounds (VOCs) Online Monitoring System

Volatile Organic Compounds (VOCs) play a critical role in atmospheric chemistry, acting as key precursors to ozone formation and secondary organic aerosols. Governments now prioritize VOC management, listing them as the fifth major pollutant after COD, ammonia-nitrogen, SO₂, and NOx. Consequently, reducing industrial VOC emissions has become vital for global air quality improvement.

Applications:

  • Plastic products manufacturing
  • Etroleum refining and petrochemistry
  • Pharmaceutical manufacturing
  • Vehicle surface coating
  • Rubber products manufacturing
  • Printing Industry
The Volatile Organic Comounds (VOCs) online monitoring system integrates four key subsystems for precise industrial emissions control.
  • Gaseous pollutant monitoring subsystem uses a sampling probe with a ceramic filter to extract dust-free gas samples.
  • The flue gas monitoring subsystem employs a TPF-integrated monitor to analyze stacks’ temperature, oxygen, humidity, and flow velocity, while a hygrograph ensures accurate gas moisture measurement.
  • Calibration and assistant subsystem maintains system accuracy through automated checks.
  • Control and data collection subsystem houses a centralized control cabinet with an IPC, heating modules, and a high-temperature pump for real-time data processing.
VOCs Online Monitoring System structure
VOCs Online Monitoring System structure
To enhance reliability, an air compressor provides gas for regular pipeline blowback, minimizing condensation risks in heat-traced sampling lines. This system supports VOCs emission reduction and aligns with strict environmental compliance standards.

-Volatile Organic Comounds (VOCs) Online Monitoring System Technical Parameters-

Parameter Range Principle
NMHC 0~1000ppm(customizable) GC-FID
HC 0~1000ppm(customizable) GC-FID
Benzene series 0~10ppm(customizable) GC-FID
Oxygen 0~25% Zirconia
Temperature 0~300℃(customizable) Thermal resistance or thermocouple
Pressure -10kPa~+10kPa(customizable) Pressure sensor
Flow velocity 0~40m/s(customizable) Pitot tube
Humidity 0~40%vol(customizable) Humicap or dry/wet oxygen

 -General Rarameters-

Cabinet dimensions 800mm*800mm*2000mm Tracing pipe temperature 120℃~150℃
Enclosure rating IP42 Power supply 220VAC,5000W
Work temperature -20℃~50℃ Work humidity 0~95%RH ( no dew fall )
Compressed air pressure 0.4MPa~1MPa. The gas output is rated at 200L/min
and shall be equipped with a 0.5 square meter gasholder.
External output 4-20mA, RS232, RS485.etc; Protocol: modbus

 

Detection Principle:
1) The Hydrogen FID (Flame lonization Director)

When volatile organic compounds (VOCs) burn in a hydrogen flame, high temperatures ionize the gas molecules. This process releases free electrons, which an electric field gradient efficiently directs toward a collector electrode. As electrons accumulate, they generate a measurable ionization current. Since the current strength directly correlates with VOC concentration, analysts use this linear relationship to quantify trace gas components in environmental monitoring and industrial safety applications.
FID-detection-principle
FID-detection-principle

2)Chromatographic Column Separation Process

Chromatographic-column

Chromatographic-column 1

The carrier gas propels the sample mixture toward the chromatographic column’s right end. As the multicomponent gas flows through the column, the stationary phase selectively adsorbs its molecules. Since each gas component interacts uniquely with the stationary phase, their migration rates diverge significantly. This retention time variation enables precise component separation at the column outlet.
The Volatile Organic Comounds (VOCs) online monitoring system integrates four key subsystems for precise industrial emissions control.
  • Gaseous pollutant monitoring subsystem uses a sampling probe with a ceramic filter to extract dust-free gas samples.
  • The flue gas monitoring subsystem employs a TPF-integrated monitor to analyze stacks’ temperature, oxygen, humidity, and flow velocity, while a hygrograph ensures accurate gas moisture measurement.
  • Calibration and assistant subsystem maintains system accuracy through automated checks.
  • Control and data collection subsystem houses a centralized control cabinet with an IPC, heating modules, and a high-temperature pump for real-time data processing.
VOCs Online Monitoring System structure
VOCs Online Monitoring System structure
To enhance reliability, an air compressor provides gas for regular pipeline blowback, minimizing condensation risks in heat-traced sampling lines. This system supports VOCs emission reduction and aligns with strict environmental compliance standards.

Measuring carbon dioxide (CO2) is important for understanding the role it plays in the environment and its effect on climate change. CO2 is a major component of Earth’s atmosphere, and it traps heat like a blanket, causing global temperatures to rise. Too m uch CO2 can lead to drastic changes in our weather patterns and ecosystems, so monitoring its levels is essential for predicting future climate conditions. Additionally, measuring CO2 can help us better understand our impact on the environment and make informed decisions about how to reduce emissions and slow down down down down down global warming. By analyzing CO2 data over time, we can develop strategies to mitigate the effects of climate change and ensure a sustainable future.

Before industrialization, the global average annual atmospheric carbon dioxide concentration was 278ppm (1ppm is one part per million). In 2012, the global annual average atmospheric carbon dioxide concentration was 393.1ppm. By April 2014 , the monthly average carbon dioxide concentration in the northern hemisphere atmosphere exceeded 400ppm for the first time. . 2. Global climate warming, the continuous aggravation of the atmospheric greenhouse effect leads to global climate warming, resulting in a series of global climate problems that cannot be predicted by today’s science. According to the International Climate Change Economics Report, if human beings maintain the current way of life, by 2100, there will be a 50% chance that the global average temperature will rise by 4°C.

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