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Volatile Organic Compounds (VOCs) Analyzer

Volatile Organic Compounds (VOCs) Analyzer

Volatile Organic Compounds (VOCs) Analyzer
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Volatile Organic Compounds (VOCs) Analyzer

Introduction

Volatile Organic Compounds (VOCs) analyzer 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
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Structure

The Volatile Organic Compounds (VOCs) analyzer integrates into an online monitoring system 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 maintain 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 Compounds (VOCs) Online Monitoring System Technical Parameters-

ParameterRangePrinciple
NMHC0~1000ppm (customizable)GC-FID
HC0~1000ppm (customizable)GC-FID
Benzene series0~10ppm (customizable)GC-FID
Oxygen0~25%Zirconia
Temperature0~300℃ (customizable)Thermal resistance or thermocouple
Pressure-10kPa to +10kPa (customizable)Pressure sensor
Flow velocity0~40m/s (customizable)Pitot tube
Humidity0~40%vol (customizable)Humicap or dry/wet oxygen

 -General Rarameters-

Cabinet dimensions800mm*800mm*2000mmTracing pipe temperature120℃~150℃
Enclosure ratingIP42Power supply220VAC, 5000W
Working temperature-20℃~50℃Work humidity0~95%RH (no dew fall)
Compressed airpressure 0.4MPa~1MPa. The gas output is rated at 200L/min
and shall be equipped with a 0.5 square meter gasholder.		External output4-20mA, 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 electrode collector. 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.

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Structure

The Volatile Organic Compounds (VOCs) analyzer integrates into an online monitoring system 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 maintain 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.

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