Continuous emission monitoring system - CEMS

The Continuous Emissions Monitoring System (CEMS) is used to measure in real time the emissions of gaseous pollutants from an industrial boiler, cogeneration, power or thermal plant. The CEMS is used to monitor criteria pollutants and control compliance with environmental regulations, to monitor plant and facility performance and to provide data for maintenance planning.


Continuous Emission Monitoring System CEMS

cems continuous emission gas analysis system

Long term superior stability continuous emission monitoring systems

Simultaneous measurement of up to 14 components in flue gas. The Fuji Electric CEMS Continuous Emissions Monitoring System, utilizing advanced gas analyzers, allows the continuous monitoring of gas concentrations in flue gases from natural gas, fuel, coal plants, industrial processes, urban waste combustion, cement plants, or waste incineration, district heating, power generation such as:

CO - CO2 - NOX - N2O - NH3 - HCI - CH4 - O2 - H2O
PRESSURE - TEMPERATURE - FLOW - DUST - HUMIDITY

Features of the continuous emission monitoring system

for boilers, engines and gas turbines

For boilers, motors & gas turbines at power stations:

  • CE-marked continuous emission monitoring systems
  • QAL1 certified (TÜV / MCERTS) system compliance
  • QAL2 system compliance
  • QAL3 automatic system
  • Single or double beam NDIR gas technology analyser
  • Multiplexed sampling system
  • Simple installation and maintenance
  • Immediately compatible with Fuji DAHS system (Data Acquisition and Handling System)
  • Fuji FBOX remote control & maintenance system

    Our continuous emission analysis system is designed to provide accurate and reliable data for various industrial applications. It ensures that air emissions are continuously monitored and recorded, helping industries meet stringent environmental regulations. The system is equipped with advanced sensors and real-time data processing capabilities to deliver precise regulated pollutants measurements.A main component of this system is the Data Acquisition and Handling System (DAHS), which plays a critical role in collecting, validating, and recording emissions data for compliance reporting of emissions profiles.

What is continuous emission monitoring system ?

Principle of the Continuous Emissions Monitoring System

The CEMS system consists of one or more analysers high-performancegas systems, an analyser oxygen system and a sample conditioning system. They have been specially designed by Fuji Electric France to meet the regulatory requirements of installations falling within the scope of the European Directive and EPA legal requirements.

FUJI Electric France Continuous Emissions Monitoring System is a gas analysis equipment that is QAL1 certified by TÜV according to emission standards EN 14181, EN ISO 14956 and EN 15267.

Fuji Electric France CEMS continuous emission monitoring system includes

Also available as an option:


Diagram of the Continuous Emissions Monitoring System

Diagram of the Continuous Emissions Monitoring System

CEMS Systems General features

Measurable components

The continuous monitoring systems can measure a multitude of components from regulated pollutants, including CO (Carbon Monoxide), CO₂ (Carbon Dioxide), NOx (Nitrogen Oxides), SO₂ (Sulfur Dioxide), O₂ (Oxygen), H₂O (Water Vapor) N₂O, NH₃, HCl, CH₄, in addition to pressure, temperature, flow rate/speed, and dust content.

Innovative measurement technologies for high accuracy

Measurement principles vary depending on the components. For CO, CO₂, NOx, N₂O, SO₂, CH₄, non-dispersive infrared (NDIR) is used. O₂ is measured using zirconia, paramagnetic or electrochemical technology, while NH₃, HCl, H₂O are measured by laser. Dust is quantified by LED optical scattering.
Gas stream flow measurement is performed by Microventuri dp flow meter, but other methods can be used as options for specific requirements. Pressure is measured by a capacitive pressure transmitter, and temperature measurement is provided by a PT100 probe.

Speed and reliability

Response time is impressive, with less than 200 seconds for NDIR technologies and less than 5 seconds for the laser. This guarantees rapid detection of changes in the air atmosphere.

Intuitive user interface

Equipped with a 10″ touchscreen, the system uses the Fuji CEMS Manager v7 software module, offering an intuitive user interface for monitoring and managing data.

Advanced Connectivity and Extended Options

The system features standard Modbus® TCP/IP connectivity, with options such as 4-20 mA, Profibus, Modbus® RTU, Internet/GSM (FBOX). Outputs and contact inputs allow extensive customization of alarms and functions.

Advanced features of continuous emission monitoring systems

Options include automatic calibration, automatic blowback, and automatic QAL3 in combination with the Fuji ACE DataQAL3 software module. The system can also multisample up to 8 stacks, offering remarkable flexibility.

Complete Sampling System

The sampling system includes a sample probe, heated sample line, filters, coolers and pumps tailored to the customer's application, ensuring accurate, reliable measurements of the sample gas under a wide range of conditions.

Calibration Gas

Calibration gases, supplied locally, are carefully selected. Zero calibration uses a small sample of clean, dry nitrogen or air, while scale calibration involves a mixture of 90% of each measured component in N₂. For zirconium oxide, specific mixtures of O₂ in N₂ are used.

Versatile power supply

Fuji's CEMS system is compatible with 100, 110, 115, 200 or 230 Vac, 50/60 Hz power supplies, guaranteeing adaptability to different electrical configurations.

Reliability and Compliance Made Easy

With dimensions suitable for indoor installation, the gas analyser cabinet measures 600 (W) x 800 (D) x 1800 (H). The complete sampling system, including sample probe, heated lines, filters, coolers and pumps, guarantees consistent reliability and compliance.

CEMS Specific performance

Continuous emission monitoring systems CEMS Specific performance

Advanced Technology for Precise Measurement

The Fuji Electric CEMS continuous emission monitoring systems operate with various gas analyzers : the ZRE gas analyser with single-beam NDIR and the ZKJ gas analyser with double-beam NDIR. Both gas analysers cover a wide range of gases and parameters.

The measurement scales of gas analyser ZRE include :

For the ZKJ CEMS analyzer, the measurement scales are as follows:

For other measurement scales, both CEMS analysers offer the same performance:

Exceptional performance and assured precision

Exceptional repeatability is maintained at ≤ ± 0.5% FS for NDIR and ZrO2, and ≤ ± 1% FS for the laser.

Linearity remains consistently ≤ ± 1% FS, guaranteeing reliable and accurate measurements.

Zero drift depends on the chosen analyser.
For the ZRE analyser, it is limited to ≤ ± 2% FS per week for NDIR, ≤ ± 2% FS per month (ZrO₂) and ≤ ± 1% FS per week for laser.
For the ZKJ analyser, scale drift remains below ≤ ± 1 % PE per week for NDIR, ≤ ± 2 % PE per month ZrO₂ and ≤ ± 2 % PE every 6 months for the laser.

Reliability and Durability

Performance stability is maintained with a scale drift of ≤ ± 2% PE per week (NDIR), at ≤ ± 2% PE per month (ZrO₂) and at ≤ ± 2% PE every 6 months (laser) for both analysers.


Our CEMS system revolutionizes the monitoring of criteria pollutants gas emissions with real-time monitoring!