EASZ-2 Manual v1.12 - 12.2.2018 Page 23 / 30
7. Calibration
7.1. Factory Default Calibration
To accurately calculate the percentage water content the slope of the relationship between the ADC value
and the exact water content must be determined for the specific fluid being monitored. This is done by
setting two known points to create a linear relationship between water content and the ADC value.
High ADC: 28000
Low ADC: 8000
Low-Point: 0% water in fluid High-Point: max % water in fluid (e.g. 10%)
All units come factory calibrated with a Low-Point Calibration. For example, the ADC value for the low-
point is set for zero water in automotive grade diesel and the ADC value for the high-point is set to
represent 10% water. Once the unit is mounted on site it requires either a High-Point or a Two-Point
Calibration. EESIFLO also design and supply calibration loops for customers who have higher accuracy
requirements. Contact EESIFLO for further information on how we can be of assistance in this area.
7.2. On-site Calibration
Since different types of oil have slightly different dielectric properties an on-site calibration might be
required for the exact fluid being monitored unless a factory calibration has been done on the particular
fluid. There are two types of on-site calibration depending on the range and accuracy required.
7.2.1. High-Point Calibration
The High-Point Calibration is a single point calibration and should not normally be used because the
EASZ-2 is a precision device. It uses the factory set low point and only sets the maximum water content
for the given fluid without taking into account the more exact fluid characteristics. This calibration is not a
“quick fix” and should only be used when a user would like to see an indicative reading in a larger
maximum range e.g. 10% or in an application where accuracy is not as important as the change in the
fluid that is being monitored. This type of calibration might be useful to see trends over a period of time
or a sudden and distinct change in fluid make up.
High-Point Calibration Accuracy ± 0.2%
7.2.2. Two-Point Calibration
The Two-Point Calibration is a calibration of both the low-point and the high-point for the given fluid. This
calibration is used when a lower maximum value is required e.g. 1% of water content and the
measurements need to be more accurate.
Two-Point Calibration Accuracy ± 0.1%
Two-Point Calibration Accuracy with Factory Calibrated Compensation ± 0.05%
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