Moisture and Temperature Meter Series MMT310

for transformer oil, hydraulic and lubrication systems in marine and paper industry

Vaisala HUMICAP® Moisture and Temperature Transmitter Series MMT310 is a fast and reliable on-line detector for moisture in oil. Used in for applications such as e.g. monitoring of transformer oil and of lubrication systems in marine and paper industry.


  • Continuous measurement of moisture in oil with excellent long-term stability
  • Proven Vaisala HUMICAP® sensor, over 15 years in oil applications
  • Measurements in lubrication, hydraulic and transformer oils
  • Excellent pressure and temperature tolerance
  • Measuring water activity - ppm calculation for transformer oil
  • Traceable calibration (certificate included)

Key benefits

Easy to install and operate

Installation through ball valve. No need to shut down the process.


Online, real-time detection of moisture in oil without sampling.


Tells the true margin to water saturation point in all changing conditions, taking into account e.g. temperature changes and aging of oil.