With almost 50 years of experience developing and manufacturing Capacitive Moisture Sensors for air and oil, Vaisala has become the market leader for this application across multiple industries including power transformers, lubrication systems, maritime and paper industry. Built-in our own clean rooms, theses sensors offer long term stable and precise measurements, no matter how robust the application.
We offer a full line of equipment integrating these sensors from our fixed MMT330 for monitoring only Moisture in Oil, to our MHT410 for monitoring Moisture and Hydrogen. We also offer a portable solution for field measurements and calibration, the MM70.
Vaisala uses Humicap sensor technology for measuring moisture in oil. The Humicap sensors are the first ever sensors that can measure moisture in oil online. The sensor materials are specifically developed to measure even very low moisture levels in oils, whether mineral, vegetable or synthetic. The Vaisala Humicap is manufactured in Vaisala clean rooms and is a thin film sensor consisting of a substrate on which a thin polymer is deposited between two conductive electrodes.
Effect of relative moisture saturation (%RS) on dielectric strength of transformer insulation oils is visible in the picture on right.