Cleaning the electrode of an OES unit (stationary or mobile) ensures proper analysis results. The electrode plays an important role in the analysis process as a conduit for electricity to create a plasma stream which emits light. When an electrode isn’t properly maintained the unit will generate irregular results.
OES electrodes are made of either Tungsten, Copper or Silver alloy which effectively conduct electricity; however, these alloys also deposit a small about of their alloy matrix into the analysis light stream along with soot. To reduce the amount of soot and material being deposited into the light stream operators need to use a small steel wire brush to effectively clean the electrode of analysis deposits. The cleaning process takes only a few seconds but ensures consistent results between tests.
When probes or sample stands are not used for 3-4 weeks a layer of oxidation will form on the electrodes surface; a Scotch Brite Pad and light polishing will remove the oxidized layer allowing the electrode to function properly. Electrodes made of Copper or Silver alloy need replaced every 2-3 months while Tungsten electrodes rarely need replaced.
For more information on spectrometer maintenance visit the knowledge center or contact us to schedule an on-site operator training course.
OES MAINTENANCE & CALIBRATION: