EE381 - Moisture sensor and switch


E+E Transmitter Series EE381 are specially designed 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 preventive maintenance of plant and machinery. For instance, moisture affects dramatically the insulation characteristics of electrical transformer oil and therefore continuous monitoring is extremely important.
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.

Technical data 
Measuring range0...1aw; -40...80°C
Output signal0...1/5/10V or 0/4...20mA
Accuracy+/- 0.02aw; +/- 0.2°C
Voltage10...30V DC
Protection classIP65
Temperature range-40...+60°C