QSG 750-II

Our 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.

Benefits

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

Optics

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

Electronics

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

Computer-Hardware

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

Software

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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