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Moisture content of Oil

10 August 2012

Manufactured by E+E Elektronik GmbH, Austria.

The EE381 series transmitters are specially designed for the measurement of water content in oil. They are ideal for online monitoring of moisture in lubrication or insulation oil, which is very important for the long-term performance and preventive maintenance of plant and machinery. Moisture dramatically affects the insulation characteristics of electrical transformer or switchgear oil.
The measured physical quantities are water activity "aw" and temperature T. With these quantities EE381 calculates the water content x (ppm) in mineral transformer oils. Calculation of water content (ppm) in non-mineral oils and lubrication oils can be achieved by programming the specific parameters of the oil into the EE381.

Humidity measurement in oil

  • ppm (mass of water / mass of oil)
  • aw (actual water content as fraction of the water content in saturated oil)
    aw = 0 corresponds to water-free oil, while aw = 1 indicates saturated oil.

Omni Sensors and Transmitters Ltd.


Similar to the humidity in the air, the water content in oil can be indicated by the absolute value in ppm or by the relative value aw:www.sensorsandtransmitters.com Tel; 01926 614263


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