SPECTRO ARCOS - The Ultimate ICP-OES for Sample Throughput and Sensitivity

February 25, 2007

It’s Name Tells It All: ARCOS (Advanced Rowland Circle Optical System)
New Optics Offer Up to 2-Times Better Resolution Making 
Ideal ICP-OES for Line-Rich Matrices and for Ultra-Trace Analysis

Kleve, Germany, February 25th, 2007 – SPECTRO Analytical Instruments unveils the latest state-of-the-art ICP-OES instrument - the SPECTRO ARCOS - at the Pittcon Conference (February 25 to March 1, 2007) in Chicago, Illinois. According to SPECTRO, there is no faster or more sensitive Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES) instrument commercially available.

The SPECTRO ARCOS is especially suited for such demanding analytical applications as ultra-trace analysis for environmental applications or line-rich spectra for metal applications or the analysis of organic materials in petrochemistry. The new instrument’s high performance results from the two completely new major components: the optics and the generator.

In the optic, SPECTRO utilizes 32 linear CCD detectors in an optimized Paschen-Runge mount ORCA (Optimized Rowland Circle Alignment) for the simultaneous recording of the wavelengths between 130 and 770 nm. However, what makes the optic so special is the enormous focal length of 750 mm, which improves the resolution by a factor of two. Coupled with the higher resolution is an improvement in the signal to background ratio, which has also been bettered by a factor of up to 2.

The optic is constructed in two aluminum half-shells. That enables an extremely compact construction so that a great deal less inert gas is required to fill the optical chamber than a conventional assembly. Once again, SPECTRO utilizes the proven UV-PLUS inert gas filter system in the SPECTRO ARCOS that requires no flushing whatsoever. Over the lifetime of the spectrometer this can mean a savings of up to one third of the initial instrument purchase price when compared to a purged system.

The other major development in the new SPECTRO ARCOS is its generator. Here too, major technological advances are combined that result in significant economic improvements. The generator uses a tube with a maximum input power of 5 kilowatts; however, the maximum load during an analysis is only 1.7 kilowatts. There are enough high-power reserves for even peak loads such as for the analysis of volatile organic materials, so that the generator has an excellent lifetime. The low-temperature ceramic tube is forced air cooled by an internal ventilation system, eliminating the need for uneconomical liquid coolants.

Based upon these improvements, the SPECTRO ARCOS is faster than all of its predecessors and competitive products, creating and processing a complete spectrum in two seconds. In time resolution mode, sampling frequencies of up to 10 measurements per second can be achieved enabling hyphenated measurements, for example, the analysis of trivalent and hexavalent chromium using IC-ICP-OES.


SPECTRO is one of the worldwide leading suppliers of analytical instruments for optical emission and X-ray fluorescence spectrometry. As a member of the AMETEK Materials Analysis Division, SPECTRO manufactures advanced instruments, develops the best solutions for strongly varying applications and provides exemplary customer service. Innovation, instrument concerns and customer relations are its main activities. From its foundation in 1979 until today, more than 25,000 analytical instruments have been delivered to customers around the world.

AMETEK, Inc. is a leading global manufacturer of electronic instruments and electric motors with an annual turnover of approximately 1.8 billion US$. AMETEK’s corporate growth plan is based on four key strategies: Operative excellence, strategic acquisitions and alliances, geographic and market expansion as well as new products. AMETEK’s common stock is a component of the S&P MidCap 400 Index and the Russell 1000 Index. 

Please contact Tom Milner for additional information, Tel: +49.2821.892-0, 
Fax: +49.2821.892-2200, E-Mail: spectro.info@ametek.com