From Electrical Equipment Handbook: Troubleshooting and Maintenance


All sample containers must be clean and dry. A used-oil analysis program is started by sending a sample of the new, unused oil to the analysis laboratory. This sample will be used as a reference standard. The analysis is based on deviation of properties relative to the new, unused oil. The used-oil sample should be collected when the oil is warm and well mixed. If a machine is down, it should be started to circulate the oil through the system.

The sample line should be purged to remove stagnant oil and debris (the sample must not be contaminated). The sample should be taken from the line before the filter. The sample should be representative of the system. If the sample is taken from a sump or a gearbox, it should be taken from the middle every time. Hand pumps can be used to withdraw a sample from a sump or crankcase into a bottle. The sample must properly identify the oil and equipment type, collection date, time since last oil change, and oil makeup rate. The sample should be taken to the laboratory as soon as possible.


Table 22.1 lists the test schedule for used industrial oils.

Table 22.1: Basic Test Schedule for Used Industrial Oils


ASTM method

Compressor oil

Gear oil

Turbine oil

Hydraulic oil















Products & Services
Oil in Water Monitors
Oil in water monitors are used to detect the presence of hydrocarbons in water.
Environmental Testing and Analysis Services
Environmental testing and analytical services provide testing of environmental samples such as soil, water, air, and industrial wastes or byproducts.
Oil Sensors and Analyzers
Oil sensors and oil analyzers are used in automotive or industrial machinery applications to sense oil levels, and check for contamination, and particulates, viscosity and/or temperature.
Polarimeters are scientific instruments used for measuring the rotation of the plane of polarized light as it passes through a sample of a compound which exhibits optical activity.
Material Testing Services
Material testing services test, analyze, and certify a wide range of materials for purity, chemical compatibility, and environmental impact.

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