The Sampling Process
Trend Analysis
 A single sampling
analysis is useful in providing information when critical
failure conditions exist. However, trend analysis is a
better tool for estimating the useful life or overall
condition of your engine or equipment. Trend analysis
samples are taken and analyzed at regularly scheduled
intervals. Comparing the most recent analysis to previous
reports on a given machine shows the development of trends.
Monitoring these trends enables early detection of internal
abnormalities. Tested values falling within acceptable
limits may show a pattern of subtle variance, which could
signal a developing problem.
Machines of the same type will accumulate
contaminants and wear at different rates. Performing trend
analysis on each machine is the most effective method
of giving you an internal look at your equipment and enabling
you to deal with developing problems before they become
catastrophic situations. Sampling Frequency
The frequency of sample analysis from your equipment depends
on the machine type, machine application and condition,
operating environment and other variables. For example,
many machines that operate in harsh environments, such
as heavy equipment in mining or construction, require
short oil sampling intervals - every 100 to 300 operating
hours. However, certain power transmission systems, such
as gearboxes and hydraulic systems used inside manufacturing
and production facilities, require no more than quarterly
sampling intervals. The following table lists generic
sampling frequencies for common equipment types, and is
provided as a guideline only. Additional information is
available from Oil Analyzers Inc., your lubricant supplier,
and the equipment manufacturer.
Collecting a clean and representative oil
sample is critical to the oil analysis process. Put simply,
an oil analysis is only as good as the sample taken. The
accuracy and reliability of the data produced by an analysis
hinges on receiving a representative sample from the equipment
to be tested. To assure that the sample extracted is representative
of the system, always follow proper sampling procedures.
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