QSG 750-II


QSG 750-II

QSN-750_03Our QSG 750-II spark emission spectrometer can also be called OBLF’s flagship model. This single- or multi-matrix model is ideal for all applications demanding the lowest possible detection limits, the highest degree of reproducibility and additional metallurgical information about the analyte. The application spectrum goes from primary producers like steel mills or other smelteries through metal-processing companies right up to research institutes and universities.

At first glance, the QSG 750-II is comparable with the QSN 750-II model. The main difference lies in the data logging system, which is based on the GISS technology (Gated Integration of Single Sparks) developed by OBLF. Given identical dimensions, it is also fitted with tried-and-tested hardware components like the temperature-stabilised 750 mm vacuum optics, the Gated Digital Source (GDS) technology with freely definable parameters and the patented, self-cleaning spark stand. An exhaust filter ensures consumed argon is purged. The easy accessibility of all key device parts simplifies service tasks that need to be performed by the user.

  • multi matrix applications
  • up to 64 PMT element channels
  • GDS III spark genetator
  • vacuum system
  • self-cleaning spark stand
  • suitable for automated systems
  • gated integration (GISS)
  • inclusion analysis (GISS)
  • double electrode system with ULB as option
  • automatic electrode cleaning as option
More Infos

The QSG 750-II uses the GISS (Gated Integration of Single Sparks) data logging system, developed by OBLF. In combination with logging and online processing of the single spark intensities of all measuring channels, time-resolved spectroscopy gives rise to many additional applications.         Single spark spectrometry (or PDA – pulse distributed analysis), for instance, provides critical information about the microscopic composition of the sample. In this respect, key words are the detection of inhomogeneous samples, differentiation between dissolved and undissolved components (e.g. aluminium in steel) as well as the detection and determination of inclusions. To ensure best possible use can be made of these options, the OBLFwin software not only includes all standard functions (materials control, automatic program selection, etc.), but also provides additional features that permit simple definition of parameters when a bad sample is detected or when analysing inclusions. All the single spark data can be made available for export to other computer systems.

Time-resolved spectroscopy can reduce spectral interference and substantially improve the detection limits of many elements in comparison to standard spectrometers. This opens up completely new avenues when analysing pure metals.

All of the QSG 750-II model’s many functions are available for manual and automated operation, as many applications have shown in the steel industry in particular. In such cases, sample handling is performed by a robot and the counter-electrode is cleaned by a special unit fitted to the spark stand. The measured values are automatically transferred to superordinate systems using a network connection. Integrated software modules control and monitor the functionality of the spectrometer. These functions also include analysing control and recalibration samples.

Precise instructions on how to operate the QSG 750-II model and use the software are naturally given during installation. The customer only has to ensure availability of a power and an argon supply.

Technical Data


  • spectrometer in Paschen-Runge mounting
  • Rowland circle diameter 750 mm
  • wavelength range 110-770 nm
  • optics and read-out electronics temperature stabilised to ± 0.1°C for excellent long-term stability
  • automatic computer controlled profiling
  • coma corrected slits
  • PMT types selected according to the respective wavelength
  • shock resistance

Vacuum System

  • evacuated light metal chamber
  • maintenance free 2-stage rotary vane pump
  • vacuum pump integrated in cabinet
  • pump duty cycle <5%
  • oil diffusion protection
  • automatic pressure regulation and stabilisation

Spark Generator

  • Gated Digital Source (GDS) with integrated multi-spark system
  • maintenance free
  • spark frequency up to 1 kHz
  • unipolar medium voltage discharge
  • separate parameter for pre-sparking and integration selectable
  • variable excitation parameters & discharge characteristics selectable by software
  • Ignition voltage 20kV

Spark Stand

  • argon purged spark stand, optimised for low Ar consumption
  • patented self-cleaning
  • open sample stand for easy handling
  • low-wear top plate with 12 mm opening
  • optionally adapters for small parts and wires are available
  • low-wear tungsten electrode
  • pneumatic sample clamp for rapid sample handling
  • automatic electrode cleaning as option
  • about 3 l argon consumption per measurement
  • easy maintenance


  • stabilised PMT high voltage supply
  • 23 bit AD conversion for each channel
  • GISS technology (Gated Integration of Single Sparks)
  • DSP processor controlled
  • USB interface to spectrometer PC

Dimensions & Weight

  • width 104 cm
  • height 130 cm
  • depth  90 cm
  • weight about 460 kg

Power Supply

  • 230V; 50/60 Hz; 1,5 kVA
  • 500 W in stand-by mode

Environmental Conditions

  • operation temperature 10 – 40 ºC


  • standard computer system
  • MS Windows® 7 operating system with custom specific regional and language settings


  • OBLFwin spectrometer program
  • easy routine operation
  • freely configurable sample IDs
  • automatic repeatability control for measurements
  • automatic averaging
  • warning signal if calibration is exceeded
  • bad sample detection including dynamic measurement control (option)
  • as many analysis programs to customer specifications as required
  • individual analysis parameters for each program
  • multivariate calibration model (incl. line overlaps and matrix effects)
  • easy and simultaneous recalibration of a complete matrix
  • automatic program selection
  • fomula editor for GISS calculations
  • graphical single spark evaluation module
  • online inclusion analysis calculations
  • type calibration and type measurement
  • spectrometer control sample measurements
  • average and standard deviation from chosen measurements
  • automatic reminder of regular recalibration
  • grade control by comparison with grade database settings
  • automatic display of of selected grade or material number
  • freely editable grade database
  • printout of certificates
  • analysis database
  • several statistical functions as display of control charts
  • automatic analysis data export
  • system check preceding each analyse
  • System diagnostics module
  • software supported maintenance tasks, for example entrance window cleanin
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