CEM II system

Gasmet™ CEMS II is a modular construction that typically comprises of Gasmet™ CX4000 FTIR gas analyzer, heated sampling unit, industrial PC and a Zirconia oxygen analyzer which are installed in an air-conditioned cabin. All modules are 19" rack mounted in pull-out shelves for easy accessibility & service.

Gasmet™ CX4000 FTIR gas analyzer allows the simultaneous measurement of up to 50 gas compounds. CX4000 FTIR has a multi-pass sample cell which is heated to 180 °C and features rhodium-gold plated mirrors.

The hot-extractive sampling system consists of a heated sample gas probe, heated sample lines and heated sample pump unit. Two-stage particle filtration is used in order to remove particles from the sample gas. The sample pump unit includes gas connections for the CX4000 FTIR gas analyzer, optional O2 analyzer, and span & zero gas.

The industrial PC is used processing & storing the sample spectra with Calcmet™ software. The Calcmet™ software analyzes the sample spectrum using sophisticated analysis algorithms. Cross-interference from other gases is automatically taken into account in the analysis settings of each compound. Since water content of the sample gas is measured, the results can be reported on either “wet” or “dry” basis. With Gasmet™ CEMS, TOC can be measured without an additional FID analyzer (as a sum of individual hydrocarbons).

Comprehensive I/O functions make possible to connect CEMS II into all kind of automation or reporting systems. Measuring data and alarms can be transferred from Gasmet CEMS II to other systems with analog or digital format. Gasmet CEMS II is also equipped with analog / digital inputs for external data (other analyzers or process).

Gasmet CEMS II provides different alarm functions such as System alarm, Service request, Maintenance on progress (can be set also manually), Concentration alarm, and Result valid. Combination for each alarm can be set on Calcmet. If any of the critical alarm is activated, instrument air starts to flow automatically into the system to prevent condensation.

With FTIR measurement technology there is no need to do any span or re-calibrations, only zero calibration with nitrogen every 24 hours. Automated span checks are also supported as standard.

Typical application is H2O, CO2, CO, N2O, NO, NO2, SO2, HCl, HF, NH3, CH4, C2H6, C3H8, and C2H4 monitoring from a waste incinerator or large combustion plants. Measured components and calibration ranges can be changed according to the application.The Gasmet CEMS II is an ideal tool to use for measuring trace concentrations of pollutants in wet, corrosive gas streams. All parts of the Gasmet CEMS II are be heated up to 180 ºC. It can be used for undiluted gases and the sample gases do not need drying beforehand.

The Gasmet CEMS II includes all power connections and temperature controllers for heated lines and heated sample probe. The operation of the system is fully automatic and controlled by the Calcmet software. Additionally, all functions of CEMS II can be controlled manually.

Gasmet CEMS II is air conditioned with a compressor cooling unit on top of the cabinet. Cabinet includes ready-made through-leading rubbers on each side and top of the cabinet for all cables and lines. Gasmet CEMS II is also supported by full remote control. The Gasmet CEMS II FTIR has a very low cost of ownership; the equipment is extremely well designed, and requires very little maintenance. The system also has a number of inbuilt failsafe devices to protect the instrument from potential damage.



  • Low need for maintenance
  • No span calibrations required (automated span checks possible)
  • Hot-extractive-sampling; no sample loss or change of composition
  • Capability to water soluble compounds like HCl, HF, NH3, etc.
  • TOC (Total Organic Carbon) measured with FTIR
  • Fully automated measurement system with comprehensive safety functions
  • Ready for future requirements - new compounds can be added without any hardware changes
  • Fully modular system built to customer specification


  • Waste Incineration Plants (monitoring of H2O, CO2, CO, NOx, SO2, HCl, HF, TOC, O2)
  • Cement kilns (as above)
  • Power plants with De-NOx systems (monitoring of slip NH3 & SO2, NOx, CO, O2)
  • N2O monitoring at nitric acid plants
  • Brick and glass manufacturing
  • Aluminum and steel smelters
  • Greenhouse gas emissions of wastewater treatment


 TÜV (17th BlmSchV) and MCERTS certified. Fully compliant with U.S. EPA 40 CFR Part 60 Appendix b Performance Specification 15 (Extractive FTIR Continuous Emissions Monitoring Systems in Stationary Sources).






Technical Data

General parameters
Measuring principle: Fourier transform infrared, FTIR
Performance: Simultaneous analysis of up to 50 gas compounds
Response time, T90: < 180 s, 20 m heated line
Operating temperature: 20 ± 20 °C, non-condensing
Storage temperature: -20 - 60°C, non-condensing
Gas cell temperature: 180 °C
Sample gas: Non-condensing, particle free
Flow rate: ~ 4 liters per minute
Sample gas pressure: Ambient
Installation place: Dust free and clean ambient air, without external vibrations


Measuring parameters
Zero point calibration: 24 hours, calibration with nitrogen
(5.0 or higher N2 recommended)
Zero point drift: < 2 % of measuring range per zero point calibration interval
Sensitivity drift: None
Linearity deviation: < 2 % of measuring range
Temperature drifts: < 2 % of measuring range per 10 K temperature change
Pressure influence: 1 % change of measuring value for 1 % sample pressure change. Ambient pressure changes measured and compensated


Signals (standard)

Analog output:

  • Channels: 4 - 20 mA, isolated
  • Output range: 16 freely programmable

Analog input:

  • Input range: 4 - 20 mA, isolated
  • Channels: 8 freely programmable

Digital output:

  • Output range: 24 VDC
  • Channels: 16 freely programmable
  • System alarm, Service Request, Maintenance, Concentration alarm, Results valid.

Digital input:

  • Control: By potential free contacts
  • Channels: 16 freely programmable
  • Probe temp alarm, Zero gas pressure alarm, Cabinet temp alarm, Cabinet cooler alarm, Activate System Standby, Activate span test.


Signals (optional)                   
Up to 255 terminals can be connected

Analog output:

  • Output range: 4 - 20 mA, isolated
  • Channels: 4 or 8 channels / terminal

Analog input:

  • Input range: 4 - 20 mA, isolated
  • Channels: 1, 4, or 8 channels / terminal
  • Input range: 0 – 10 V, isolated
  • Channels: 8 channels / terminal

Digital output:

  • Output range: 24 VDC, isolated
  • Channels: 8 channels / terminal

Digital input:

  • Control: By potential free contacts
  • Channels: 4 or 8 channels / terminal


Interfaces (optional)
Fieldbus output: 
Output format: ModBus, ModBus TCP/IP, Profibus, ASCII, DDE link. RS 232 or RS422/485


Industrial computer
See Gasmet Industrial Computer Technical Data Sheet


Air conditioning
Cooling capacity: A35°C / A35°C 1500 W
A50°C / A35°C 1100 W
Internal circulation: 500 m3/h


Electrical connections
Main supply: 3 x 16 A, 3 x L+N+PE
Power consumption: The full Gasmet CEMS II including sample probe and heated lines (21 m) is approximately 7.5 kW


 Instrument air
Instrument air inlet: 6 mm tube
Instrument air quality: Dry, oil and particle free
Consumption: 1 l/min with continuous instrument purge
15 l/min with safety flushing (error mode)
50 l/min with waste gas dilution (optional)


Material: Bake painted steel
Dimensions (mm):

212 x 61 x 70 cm
(A/C unit on the cabin roof)

210 x 61 x 113 cm
(A/C unit at the back of the cabin)

Dimensions H x W x D

Weight: ~ 500 kg (full system)
Protection:   IP 54


Gasmet Technologies Oy shall not be liable for technical or editorial errors or omissions contained herein. The information in this document is provided “as is” without warranty of any kind and is subject to change without notice. Should you find any errors, we would appreciate if you notified us.


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