EASZ-2 Manual v1.12 - 12.2.2018 Page 8 / 30
3.3. Functionality
The EASZ-2 Water-In-Oil Monitor (Water-Cut / BS&W) is designed to continuously measure the water
content in hydrocarbon fluids:
■ Accurately
■ Reliably
■ Provide a linear analog or digital output
The fluid being measured flows through a fixed electrode assembly in the sensor pipe which measures
the dielectric constant as a variable capacitance across the electrode. This is then converted to an analog
or digital output proportional to the measured water content.
The graph below illustrates a simplified relationship between water content in the fluid and capacitance.
The dielectric constant between oil and water varies significantly. Generally a typical value for water is
around 80 and a typical value for oil is around 2. Since there is a large difference it is possible to measure
the water content with high degree of accuracy.
Relationship between water content and capacitance
3.4. Mixing
The EASZ-2 can also be supplied with an inline Pre-mixer. Pre-mixers become more important the larger
the size of the supply pipe due to gravity and “bottom water” effects which can then produce inaccurate
results. The Pre-mixer eliminates these problems by producing a homogeneous mixture just prior to
sampling for more accurate results.
Bottom Water Effects Homogeneous Accurate Results
PRE-MIXER
Inline Fluid Pre-Mixer
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