Compact Moisture in Oil Sensor

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  • Moisture in Oil


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.


    • 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
    • Pressure rating 20 bar
    • G ½" ISO or ½" NPT process connection
    • Swirling front-end
    • Configurable and adjustable

    Données techniques

    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
    10-30V DC

    Calibrating your limits

    La précision de vos produits et services dépend des outils que vous utilisez pour les mesurer. Forte de plus de 20 ans d'expérience, l'équipe d'étalonnage de E+E Elektronik s'attache à fournir un service fiable, sans retard ni parti pris inutile.

    Découvrez l'intérêt de travailler avec un expert en étalonnage qui accorde la priorité à

    • la précision,
    • rapidité et
    • fiabilité

    Plus d'informations

    Produits connexes


    Téléchargements EE381

    Foire Aux Questions (FAQ)

    Calibration for a specific oil is a laboratory procedure for determining the saturation curve of the oil. The saturation curve 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).

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

    Please see the cleaning instructions.

    No, coating is not available for the E+E MIO sensors.

    The standard scope of supply of E+E MIO sensors includes an inspection certificate according DIN EN 10204 - 3.1. For details on calibration certificates please see  our white paper "Calibration and Traceability in Measuring Technology".

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

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

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