User Manual
EE381
Page 7
Humidity measurement in oil
Similar to the humidity in the air, the water content in oil can be indicated by the absolute value in ppm or by the relative value a
w
:
- ppm (mass of water / mass of oil)
- a
w
(actual water content as fraction of the water content in saturated oil)
a
w
= 0 corresponds to water-free oil, while a
w
= 1 indicates saturated oil. aw measurement with the EE381 sensor is based on the
outstanding long term stability and resistance to pollution of the E+E HMC capacitive sensing elements series.
The sensor has two freely selectable and scaleable outputs for water activity, temperature or water content in ppm.
The optional configuration software allows flexible and easy adjustment of the analogue outputs to the respective
requirements. The sensor adjustment / calibration can easily be performed.
An optional display for on-site monitoring of the measuring values allows for a quick overview of the prevailing conditions in the process.
2.2 Dimensions
Values are given im mm (inch)
48
(1.9)
100
(4)
28
(1.1)
54
(2.1)
32
(1.3)
75
(3)
40
(1.6)
24
(1)
Ø12
(0.5)
spanner width:
27 or 24
G 1/2" ISO or
1/2" NPT
