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Rotating Disk Electrode
Optical Emission Spectrometry
The MOA II Plus utilizes the time-proven rotating disc electrode (RDE) sample delivery technique.
This technique remains the most effective and widely accepted method for detection and quantification
of wear metal particles, contaminants, and additives. Elements, that are either in suspended
particles or in solution, are vaporized and excited by a high energy electric discharge. Photons in
the visible and ultra violet light region are emitted by these excited elements and separated
into a spectrum using a high-resolution diffraction grating.
Intensities of resulting
characteristic wavelengths of light, corresponding to the elements of interest, are then
converted by photo detectors into electrical signals, which are processed and displayed
as results. Intensity, of these emissions, is proportional to elemental concentration.
The entire process is completed in about 30 seconds, with the only consumables being:
sample containers (bottle caps), rod and disc electrodes (rods can be reused), and
reference standards for periodic calibration.
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MOA Instrumentation International
1606 Manning Blvd., Levittown, PA 19057 USA
Tel: 215-547-8308,
info@MOAinst.com
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