Gravimetric contamination involves filtering used oil onto a membrane and using a binocular magnifier to observe any presence of external solid contaminants such as sand, dust and metal wear particles.

Water detection is essential because water alters the lubricant's lubricating properties and can lead to metal oxidation or seizing-up of the system.

TAN (Total Acid Number) is used to check the acidity content of lubricants which have been working for a long time. If the acid is excessive and therefore corrosive, then it is time to change the oil.

sample report

Particle count to ascertain the number of solid particles per category of contaminant size. These categories are: 0-5µ, 15-25µ, 25-50µ, 50-100µ and over 100µ. This test is widely used for advanced hydraulic systems where manufacturers specify the maximum permitted category.

Viscosity measurement to check for molecular shearing in the lubricant.