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The test can be performed with any lubricant containing at least one antioxidant. The test vial is prepared by mixing an oil sample with a low toxicity solution.
Using voltammetric techniques, the RULER® applies a controlled voltage through an electrode inserted into a prepared sample. As the potential increases the antioxidants become chemically active causing current to increase producing an oxidation wave. In this method, the voltage range of the oxidation wave is related to the identity of the antioxidant, and the peak value indicates the concentration of the antioxidant. The peak value of the oxidation wave is directly related to the concentration of the antioxidants in the sample.
The test results are displayed on the computer screen when the test is completed. The oxidation wave produced is viewed and the values are presented in RULER® Numbers, which can be used to track antioxidant depletion rates.
RULER® Numbers decrease as antioxidants are depleted thus it is possible to track depletion from test to test as degradation occurs. The instrument compares the RULER® Number of a used oil sample with that of a fresh oil sample (Standard) of the same formulation to determine the percentage of the Remaining Useful Life of the used oil. Through time-series testing, the Remaining Useful Life of a lubricant can be monitored and determinations can be made to predict when rapid changes in the base stock are likely to begin. Based on RULER® results, decisions can be made regarding oil changes or additive reinforcement to extend the useful life of the oil. RULER® levels must be established for a given piece of equipment and used to make proper decisions.
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