Moisture in Oil Measurement and Monitoring

Gears submerged in motor oil illustration

Moisture in Oil Measurement Solutions

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 Humicap sensor structure

What Makes Our Moisture in Oil Sensors Unique?

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.

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Benefits of Vaisala’s Moisture Measurement

Quality and Reliability

  • Provides accurate water saturation and PPM measurements in rapidly changing conditions across the spectrum of moisture.
  • All equipment comes with NIST or Accredited calibration and is field calibratable.
  • Moisture transmitters have no moving parts.

Long-Term Stability

  • Thin film polymer sensor designs protect from contamination and are highly selective to water molecules.
  • Capacitive technology provides long term stable measurement.
  • Insensitive to additives or contaminants in oil. Auto-recovery from full saturation...

Rapid Response

  • In situ measurement provides real time measurement of moisture in oil as true relative saturation (%RS).
  • Eliminates need for sampling and lab analysis for moisture.
  • Easy installation, via ball valve. Can be installed on energized transformers.