Key Parameters need to be Monitored In an Exhaust Gas Cleaning System (EGCS)

In an Exhaust Gas Cleaning System (EGCS), the following key parameter indicators need to be monitored and evaluated after treatment to ensure that the exhaust emissions comply with environmental regulations and to assess the system’s performance and effectiveness:

Key Parameters need to be Monitored In an Exhaust Gas Cleaning System (EGCS)

1, Sulfur Oxides (SOx) Concentration:

Monitoring Significance:

SOx (particularly SO2) is the primary target of EGCS treatment, and reducing its concentration is a critical indicator of the system’s efficiency.


The SOx concentration in emissions should comply with the International Maritime Organization (IMO) and local environmental regulations, such as the IMO global 0.50% m/m sulfur content cap.

2, Nitrogen Oxides (NOx) Concentration:

Monitoring Significance:

Although NOx is not the primary target of EGCS, its concentration still needs to be monitored to ensure no secondary pollution is produced.


Comply with IMO’s NOx emission standards (such as Tier II and Tier III).

3, Polycyclic Aromatic Hydrocarbons (PAH) Concentration:

Monitoring Significance:

PAHs are toxic and harmful pollutants, and monitoring their concentration helps assess the environmental protection effectiveness of the system.


Ensure that PAH concentration remains within the limits set by environmental regulations.

We Desun Uniwill developed PAH sensors to measure PAH concentration in 2023, it can detect and measure polycyclic aromatic hydrocarbons (PAHs) from 0 to 1000 ppb (µg/L). Desun Uniwill PAH Sensor operates on the principle of UV fluorescence, which is much more sensitive than the conventionally used infrared scattering or absorption method. Know more about our PAH sensor, Please email

PAH Sensor for Oil in Water Measurement

4, Particulate Matter (PM) Concentration:

Monitoring Significance:

PM emissions significantly impact the environment and health, and EGCS should effectively reduce PM emissions.


Comply with international and local PM emission standards.

5, Carbon Dioxide (CO2) Concentration:

Monitoring Significance:

Although the primary function of EGCS is not to reduce CO2, monitoring CO2 helps assess the overall carbon emissions of the system.


There are usually no direct limits, but reducing CO2 emissions aligns with global reduction trends.

6, pH Value:

Monitoring Significance:

The pH value of the wash water and treated wastewater affects the environmental compliance of wastewater discharge.


The pH value of discharged wastewater typically needs to be between 6.5 and 8.5.

Digital pH Sensor

7, Turbidity:

Monitoring Significance:

Reflects the cleanliness of the wash water and wastewater, preventing suspended particles from polluting the discharge water.


Comply with local wastewater discharge standards.

Online Turbidity Sensor

8, Conductivity:

Monitoring Significance:

Used to assess the concentration of dissolved salts in the wash water, ensuring it is within a reasonable range.


Set according to system design and environmental standards.

Conductivity Sensor/ Salinity Sensor

9, Temperature:

Monitoring Significance:

The temperature of the exhaust gas and wash water affects the scrubbing effectiveness and system operating efficiency.


Ensure operation within the design range.

10, Flow Rate:

Monitoring Significance:

Includes the flow rate of exhaust gas and wash water to ensure the system operates at its designed capacity.


Flow rate monitoring ensures sufficient contact between the exhaust gas and wash water to achieve optimal cleaning effectiveness.

Maintenance and Reporting

Regular Maintenance and Calibration:

Ensure the accuracy and reliability of sensors and monitoring equipment.

Data Recording and Reporting:

Continuously record and analyze the above parameters, generating reports to meet environmental compliance and operational optimization needs.

By monitoring and controlling these key parameters, operators can ensure that the EGCS effectively reduces pollutant emissions and complies with relevant environmental regulations.

Tags: Exhaust Gas Cleaning System, EGCS, Polycyclic Aromatic Hydrocarbons (PAH) Concentration, PAH sensors, Suppliers, manufacturers, factory, wholesale, buy, price, quotation, bulk, for sale, companies, stock, cost.

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