Gas Chromatographic Element Detector EPED ®
for Halogens and Sulfur

                 EPED Atomic Emission Detector

IMT presents a novel atomic emission detector EPED ® for gas chromatography for multielement detection. The functional principle is based on the atomization of molecules in a micro plasma and simultaneous detection of the emission lines with a high resolution Echelle spectrometer.


Features and advantages

  • Plasma Emission detector with high resolution Echelle spectrometer
  • multi-element gas chromatographic detector with high sensitivity and selectivity for sulfur and halogens chlorine, bromine, fluor, iodine
  • detection limit for all elements < 10 pg/s
  • equimolar response and linearity about 3-4 decades for all elements
  • direct coupling from column to plasma cell - no transferline required
  • simultaneous detection and multi-element chromatograms of all elements
  • long term stable and maintenance free plasma cell
  • stable pulse mode without starting-electrode, no sputtering effect
  • simple and reliable use for routine analytics and research
  • cross sensitivity to carbon 1:20 000
  • air cooled system without moving parts, installed on top of every GC
  • complete system  "Made in Germany" - 100%

Functional principle  

EPED ® is based on the direct coupling of the gas chromatographic column with a micro plasma cell  and the atomization of the eluting molecules at plasma temperatures of about 8000 K. The emitted element specific wavelengths are recorded by a high-resolution Echelle spectrometer with a two-dimensional CCD sensor. The chromatograms of the elements are transferred in real-time to a laboratory data system and to the system screen.

The following figure shows the chromatogram of the elements chlorine, sulfur and carbon:

atomic emission detector eped

The figure below shows the EPED ® detector with power supply:


Dedicated system software

All system settings can be done by the system software EPED ®. This software allows the transfer of the element specific chromatograms to the laboratory data system and to the system screen.

The recording of all spectral data with high resolution enables additionally a simple molecular mapping according to the retention time:

EPED timescan

Analytical performance

The long term stability allows the use in laboratory and process analytics.

Scope of delivery

  • Plasma detector with integrated Echelle spectrometer
  • 19" electronic and control unit, 2 m cable for plasma detector
  • Laptop with system software EPED ®
  • gas control unit for plasma gas He, additional gases: H2, O2, N2

Technical data

Size of the detector:
38 x 32 x 34 [cm] L x B x H
Weight of the detector:
9 kg
Dimension of the 19" electronic unit:
55 x 15 x 29 [cm] L x B x H
Weight of the 19" electronic unit:
8 kg
Dimension of the gas unit:
25 x 15 x 10 [cm] L x B x H
Weight of the gas unit:
2,2 kg
Gas consumption helium:
100 ml/min
Gas consumption nitrogen:
50 ml/min
Gas consumption oxygen, hydrogen:
< 5 ml/min


Brochure EPED Detector for gas chromatography

Development and adaption of the Echelle-polychromator has been realized in cooperation with :


The analytical evaluation of the EPED ® has been realized in cooperation with :

IVV Fraunhofer

We install the EPED ® detector to every GC !


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