January 2010Analytical Instrumentation & Environmental Monitoring
E+E Elektronik has designed the EE381 transmitter series especially for the measurement of water content in oil.
EE381 is ideal for online monitoring of moisture in lubrication or insulation oil, which is very important for the long-term performance and preventative maintenance of plants and machinery.
Moisture dramatically affects the insulation characteristics of electrical transformer oil and therefore continuous monitoring is extremely important. The measured physical quantities are water activity and temperature. With these quantities, the EE381 calculates the water content in mineral transformer oils. Calculation of this water content (ppm) in non-mineral oils and lubrication oils can be achieved by programming the specific parameters of the oil into the EE381.
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: ppm (mass of water / mass of oil) – aw (actual water content as a fraction of the water content in saturated oil); aw = 0 corresponds to water-free oil while aw = 1 indicates saturated oil. The aw measurement with the EE381 transmitter is based on the outstanding long term stability and resistance to pollution of the E+E capacitive sensor element series HC.
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