Compact Moisture in Oil Sensor


The robust, accurate and long term stable EE381 moisture in oil sensor is ideal for in-line monitoring of various oils as well as for predictive maintenance of plant and machinery.

EE381 moisture in oil sensor with display

The EE381 measures water activity [aw] and temperature [T], and calculates water content [x] in ppm in transformer, lubrication and hydraulic oil, as well as in diesel fuel.

The measured data is available on two analogue outputs and on the optional LCD display.

The robust metal EE381 enclosure can be rotated for optimal positioning of the display and the status LEDs.

An optional adapter and the free EE-PCS Product Configuration Software facilitate easy configuration and adjustment of the EE381.

Key Features

  • Measurands: water activity aw, temperature T and water content x in ppm
  • Oil temperature up to 120 °C (248 °F)
  • Two analogue outputs
  • LCD display
  • Status LEDs
  • G ½” ISO or ½” NPT process connection
  • Swirling front-end
  • Configurable and adjustable

Technical Data

Measuring Range
0...1 aw
-40...120 °C (-40...248 °F)
±0.02 aw
±0.2 °C (±0.36 °F)
0-1/5/10V or 0/4-20mA
10-30 V DC

Related products



What is the calibration for a specific oil? What are specfic oil parameter?

Calibration for a specific oil is a laboratory procedure for determining the saturation curve of the oil. The saturation curved is described by two parameters (A and B). These parameters are used for setting up the moisture in oil sensor for correct calculation of the water content (ppm) out of the measured temperature and water activity (aw).

How can I replace the sensing element of the E+E MIO sensor?

Sensor replacement is possible the EE360 models when option PC4 (pluggable probe). Please see the operation manual for detail and spare part code ordering guide.

How can I clean the sensing element of the E+E MIO sensor?

Please see the cleaning instructions.

Can the coating be used for E+E MIO sensors?

No, coating is not available for MIO sensors.

What kind of calibration certificate is included in the standard scope of supply of the E+E MIO sensors?

The standard scope of supply of E+E MIO sensorsincludes an inspection certificate according DIN EN 10204 – 3.1.

Are there different A, B parameters for mineral transformer oil from various manufacturers?

No, mineral transformer oils from different manufacturers are quite similar.. A and B parameters are the same.

What is the different between a 2 wire and 3 wire current output?

Transmitter with “two-wires” technology receive the power from the process, and the signal is carry on return wire (closed current loop). With technology “three-wires” the power supply is separate from current output: 2 wires are the power supply and third carry the signal.

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