September 2004Analytical Instrumentation & Environmental Monitoring
The E+E Elektronik transmitter series, EE36, is specially designed for the measurement of water content of oil. The EE36 is suitable for online monitoring of moisture in lubrication or insulation oil, which is very important for the long-term performance and adaptive maintenance of plant and machinery, for instance, moisture dramatically affects the insulation characteristics of electrical transformer oil, and therefore continuous monitoring is important.
Similar to the humidity in the air, the water content in oil can be described by an absolute value in ppm or by the relative value aw:
* ppm (mass of water or mass of oil).
* aw (actual water content as fraction of the water content in the saturated oil).
aw=0 corresponds to water-free oil, while aw=1 describes fully saturated oil.
Aw measurement with EE36 Transmitters Series is based on the outstanding long- term stability and resistance to pollution of the EE capacitive sensor element series HC.
The physical quantities measured are water activity (aw) and temperature (T). With these quantities EE36 calculates the water content (ppm) in mineral transformer oils. Calculation of the water content in non-mineral transformer oils and lubrication oils can be accomplished by downloading specific parameters of the oil. The measured and calculated values are available on two free scalable and configurable analog outputs. In addition, an optional relay output can be used for alarms and process control.
This sensing probe is designed for inline monitoring and can be placed directly in the oil, at pressures up to 10 Bar. Installation provides mounting and removal of the probe without interrupting the process. The user can easily readjust or calibrate the transmitter by using either a simple procedure with two pushbuttons on the printed circuit board or the configuration software.
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