Water ingress is a major challenge for any system that uses oil lubrication. Water can damage the equipment or compromise the safety, depending on the application. To prevent these problems, it is essential to monitor the water content in the oil regularly.

Unlike other parameters that can be measured by offline laboratory tests, water ingress is unpredictable and sudden. Water does not come from the oil aging or usage, but from external sources. Water levels can increase rapidly once water enters the system. Therefore, laboratory tests are not frequent enough to detect water ingress in time. A more reliable method is to use online sensors that can measure the water content continuously.