The arc-ignition device is responsible for initiating the arc discharge, and common methods include electrode contact short-circuit arc ignition and high-frequency high-voltage breakdown arc ignition. The characteristics and operation of the arc depend on the material and shape of the electrodes and on the. The principle of the analysis method of SPECTRO´s portable, mobile and stationary metal analyzers is optical emission spectroscopy (arc spark OES or spark OES). Sample material is vaporized with the testing probe by an arc spark discharge. One of these electrodes contains the sample powder to be analysed. Alloys of iron, aluminum, and copper together make up about 80% of this total. The remaining applications concern alloys of nickel, cobalt, zinc, titanium, magnesium. in interfe.