Features

The moisture in oil can be expressed in absolute or relative te rms.

Water activity aw is the relative measure for moisture in oil. It represents the ratio between the actual amount of dissolved

water and the maximum possible amount of dissolved water in the oil at a certain temperature. Independently of the oil

type, the water activity shows how close to saturation is the o il at any moment in time.

▪ aw = 0 indicates completely dry oil

▪ aw = 1 indicates fully saturated oil

EE360 measures directly the water activity.

Water content x is an absolute measure equal to the amount of water in the oil. The water content is measured in ppm

(parts per million) and is independent from the oil temperature . For assessing how far is the oil from saturation, x must be

regarded together with T.

EE360 calculates x out of the measured aw and T values. The calculation is oil dependent and requires a set of oil specific

parameters.

Water activity aw / Water content x

In certain applications, the oil can become corrosive over time , for example due to continuous contamination of lubricating

oils by salt water in the maritime environment. In such demandi ng applications, the E+E proprietary protection of the

sensing element leads can significantly extend the service life of the sensor.

Sensor Leads Protection