Small design. Big on performance.

The MERLIN 4 is a mid-range CMOS spectrometer available as a dedicated single-base unit as well as a versatile multi-base system. It is well suited for the metal production and inspection & contract lab and marine industries and perfectly suited for the metal processing industry. It is available in 2 models: the MERLIN 4 Ultra and MERLIN 4 Visible. The MERLIN 4 Ultra covers a range of 175-521 nm and the MERLIN 4 Visible: 201-521 nm. Most calibration elements are covered.

Quality Control and Assurance are essential to making your business successful. The MERLIN 4 is the ideal companion for incoming material, in-process testing and final quality inspection.

MERLIN 4 Visible MERLIN 4 Ultra
Fe, Ni, Co, Cu, Al, Mg, Zn, Sn, Pb, Ti Fe, Ni, Co, Cu, Al, Mg, Zn, Sn, Pb, Ti
All alloying elements and major traces All alloying elements and major traces Fe
Digital source for high precision Digital source for high precision
ARUN factory calibration ARUN factory calibration
Gas consumption: Low flows, no optic flush Gas consumption: Low flows, optic flush
Light path – direct Light path – direct
Technical Specifications
Optical System Paschen – Runge
Wavelength Range 175-521nm (Ultra)

206-521nm (Visible)

Power Supply Line input 90 or 260 Volts AC 50-60 Hz
EMC IEC61000-4-2



Working Temperature 10° to 30° C
Operating Humidity 20-80%
Argon Purity 99.998% or 99.999% purity
Argon Flow When burning – 3L per minute

On standby –  0.1L per minute

Dimensions 65 x 39 x 78cm
Weight 70kg
Maximum Excitation Power 400VA
Optical Source Type 50VA
Discharge Frequency 400Hz maximum
Discharge Current 150A maximum
Spark Stand Aperture 12mm
Key Features

Large Spark Plate

The plates’ corrosion resistant surface and heat dissipation composition ensures 24 hours of un-interrupted and stable analysis.

One-Button Stop Activation

In the event of mis-operation, work can be stopped immediately to ensure the safety of personnel and the instrumet.

Efficient Optical and Self-Purification

The sealed environment of the MERLIN 4 optical system maintains constant pressure and temperature settings and is self-purified. This means no argon gas is consumed. The purifier absorbs both H2O and O2. The H2O does not require replacing.

Software Features

It is not only the optical resolution that determines the analytical power of the instrument. ARUN’s bespoke software package has a powerful spectrometric hub as well as all the needed added features that help in daily routine work and make the use of the instrument efficient and a pleasure to operate.

Features include:

  • Foreign language menu capability
  • Factory calibrated programs traceable to CRMs
  • Automatic average calculation
  • Display of single or multiple analysis
  • Display of mean, standard or relative standard deviation
  • User configurable results screen
  • Formula editor (Carbon Equivalent, Total Trace, etc…)
  • Quality control and identification functions
  • User defined export functions
  • User configurable grade library
  • Report generator, print or PDF output, selection by sample ID field content
  • User standardization for global or individual program
  • User configurable type standardisation

The MERLIN 4 supports all metal types with the analyses of all their elements, in higher concentrations as well as the relevant traces. The range of factory calibrations is comprehensive with a wide choice of analytical programs for all applications and their alloys that include:

  • Iron & steel
  • Cast iron
  • Aluminium
  • Copper
  • Magnesium
  • Nickel
  • Lead
  • Tin
  • Cobalt
  • Titanium

Go to the Resources page under Applications to read about the companies who are using the ARTUS 8 for the analyses.


ARTUS 8 vs MERLIN 4 (Technical Comparison)



Front panel


Sample clamp


Spark stand


Activate button


Left side panel


Front cover/spark housing

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