Gasmet™ DX4000 is a portable FTIR gas analyzer which is typically used in stack emissions monitoring, comparison measurements, catalytic process control and other applications where multiple gas compounds need to be accurately monitored in hot & humid sample gas. The corrosion resistant sample cell is heated to 180 °C, which ensures that the sample stays in gaseous phase even with high concentrations of H2O or corrosive gases.

Gasmet™ DX4000 comes equipped with easy-to-use Calcmet™ software, which can display the concentration results in ppm, mg/Nm3 or Vol-%. All measurement data can be stored for further analysis.

Gasmet™ DX4000 is typically set-up to measure H2O, CO2, CO, NO, NO2, N2O, SO2, NH3, CH4, HCl, HF and different VOC´s. Additional gases can be added without any hardware changes. Measurement ranges can be selected from sub-ppm until vol-% level.

Gasmet™ DX4000 can be supplied with the Gasmet™ portable sampling system. This system utilizes hot-and-wet measurement principle (no drying or dilution), which ensures that the analysis is done with a representative sample. There are two stage particulate filtration: first one in sampling probe (2 µm) and the second one in sampling system (0.1 µm).

The portable sampling unit can be optionally equipped with a ZrO2 sensor for accurate oxygen measurement.

Gasmet™ DX4000 has received the coveted MCERTS certification for stack emissions monitoring. There is also VDI 3862 standard for measuring formaldehyde emissions from biogas plants in Germany.


  1. GasmetTM DX4000
  2. GasmetTM Portable Sampling system
  3. Portable sampling probe
  4. Heated lines
  5. Laptop PC with CalcmetTM software
  6. Power connection standard plug CEE-22
  7. Optional analog signals in external PC: ADAM 5000/TCP module (for analog inputs, outputs, relays)
  8. Optional wheeled cart for the analyzer and laptop computer


  • Easily configurable application for new gas components
  • Post-measurement data processing tools are unique to Gasmet
  • Wide range of applications


Technical Data

DX4000 FTIR Gas Analyzer

General parameters
Measuring principle: Fourier transform infrared, FTIR
Performance: Simultaneous analysis of up to 50 gas compounds
Response time, T90: Typically < 120 s, depending on the gas flow and measurement time
Operating temperature: Short term 0 - 40°C
long term 5 - 30°C
Storage temperature: -20 - 60°C, non-condensing
Power supply: 100-115 or 230 V / 50 -60 Hz
Power consumption: Average 150 W, maximum 300 W


Resolution: 8 cm-1 or 4 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 5.0 m
Material: 100 % rhodium coated aluminum
Mirrors: Fixed, protected gold coating
Volume: 0.4 liters
Connectors: Inlet Swagelok 6 mm
Outlet Swagelok 8 mm
Gaskets Viton® O-rings
Temperature: 180 °C, maximum
Window material: BaF2


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


Electrical connectors
Digital interface: 9-pole D-connector for RS-232
Analyzer is connected to an external computer via RS-232C cable. The external computer controls Gasmet.
Remote control connection for Portable sampling unit
Power connection: Standard plug CEE-22
PSS connection: Remote connection of PSS (Portable Sampling System)


Gas inlet and outlet conditions
Gas temperature: Non-condensing, the sample gas temperature should be the same as the sample cell temperature
Flow rate: 120 - 600 liters per hour
Gas filtration: Filtration of particulates (2 µm) required
Sample gas pressure: Ambient
Sample pump: External, not included


A/D converter:  Dynamic range 95 dB
 32-bit floating point DSP
Signal processor: 120 MFLOPS speed
Computer:  External, not included


Analysis software (for external PC)
Operating system:  Windows 7 (32-bit)
Analysis software:  Calcmet for Windows


Sample cell: Multi-pass, fixed path length 2.5 m or 9.8 m
Pressure measurement: Inside sample cell
Analog signals (ext PC): ADAM 5000/TCP module (for analog inputs, outputs, relays)
Sample cell gaskets: Teflon® coated Viton® or Kalrez®
Trolley: Wheeled cart for the analyzer and laptop computer


Material:  Aluminium
Dimensions (mm):  390 * 445 * 164
Weight:  13.9 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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