Gasmet In-Situ

Gasmet™ In-Situ analyzer consists of a sample cell inserted into the stack or duct, heated steel mounting flange and the rugged GICCOR™ interferometer unit in an IP65 enclosure that is directly attached to the flange.

Gasmet™ In-Situ offers a cost-effective alternative for extractive systems in continuous emissions & process monitoring, where multiple compounds are monitored. Typically, concentrations of H2O, CO2, CO, NO, NO2, N2O, SO2, HCl, HF, NHand CH4 are continuously monitored with a single Gasmet™ In-Situ. In addition, different VOC’s can be measured as individual compounds. There is no need for any span calibrations; only zero calibration with instrument air every 24 hours. Measurement results can be transmitted with analog 4–20 mA signals or with a digital protocol (MODBUS, PROFIBUS etc.).

By combining powerful FTIR technology with rugged in-stack measurement cell, the Gasmet™ In-Situ offers increased analytical capability and reduced cross-interference effects when compared with other types of in-situ analyzers.



  • GasmetTM In-Situ
  • Auxiliary unit with I/O functions and pneumatics included
  • GasmetTM industrial computer with RS-422 connection
  • Instrument air
  • Vortex cooling as an option
  • Additional I/Os


  • Non-extractive technique
  • Advantages of FTIR technology
  • Very resistant to stack movement and vibrations


  • Aluminum smelters

Technical Data

General parameters
Measuring principle: Fourier transform infrared, FTIR
Performance: Simultaneous analysis of up to 50 gas compounds
Response time, T90: Typically < 360 s, depending on the gas flow and measurement time
Operating temperature: -30 – +40 °C, non condensing
Storage temperature: -30 – +60 °C, non condensing
Power supply: 100-115 or 230 V / 50 -60 Hz
Power consumption: 2200 W max., 500 W continuous (with cell heating)
Instrument air: 4-7 bar pressure, dew point –20 oC, oil and dust free
Max. air consumption: 250 l/min for vortex cooling (cont.)
100 l/min for zero calibration/purge
(15 minutes at 24 hour intervals)


Resolution: 8 cm-1
Scan frequency: 10 scans / s
Detector: Peltier cooled MCT
Source: SiC, 1550 K
Beamsplitter: ZnSe
Window material: ZnSe
Wave number range: 900 - 4 200 cm-1


Sample cell
Structure: Multi-pass, fixed path length 6.0 m
Probe body material: AISI 316 steel
Mirror material: Rhodium coated aluminium
Mirror coating: Reflective gold coating
Gaskets: Viton® O-rings
Window material: BaF2
Insertion depth: 736 mm
Mounting flange: 240 mm diameter
Temperature: 250 °C
Gas filtration: Filter panels (2-7 μm)


Measuring parameters
Zero point calibration: 24 hours, calibration with instrument air
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. Sample pressure changes are measured and compensated


 Sample gas conditions
Gas temperature: Up to 250 °C, non-condensing


Electrical connectors & electronics
Digital interface: RS-232/422 cable for the analyser.
Power connection: Terminal connectors for L + N + PE wires
A/D converter: Dynamic range 95 dB
Signal processor: 32-bit floating point DSPs, 120 MFLOPS


 Computer unit
Analyzer is connected to an external computer via serial cable. The external computer controls the Gasmet In-Situ analyzer. For I/O options, see Gasmet Industrial Computer Data Sheet.
Minimum configuration: 512 MB Memory, > 40 GB hard disk, > 2.4 GHz Intel Pentium IV processor, modem, network card
Operating system: Windows 7 (32-bit)
Software included: Calcmet for Windows
Watchdog support: Included
Mouse: Included
Keyboard: Not Included
Display: TFT display
Digital Interface: RS-232 cable to analyzer (<5m)
RS-422 option up to 1000m
Remote control: Built-in modem/network card and PC Anywhere support


Adapters for flanges larger than 240 mm
RS-422/485 interface instead of RS-232 for longer distance, maximum distance one (1) kilometer.


Material: Aluminium / steel / polyethylethylketone (PEEK)
Dimensions (mm): 1168 x 417 x 263 mm
Weight: 30 kg
CE label: According to EMI guideline 89/336/EC


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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