Manual english
EE381
page 19
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 transmitter is based on the
outstanding long term stability and resistance to pollution of the E+E capacitive sensor elements series HMC.
Model T: The transmitter has two freely selectable and scaleable outputs for water content, temperature or ppm volume
concentration.
Model S: The switch with two relay outputs is designed for control and alarm purposes. The status for early warning and main alarm is
indicated by LED‘s.
The optional configuration software allows flexible and easy adjustment of the analogue resp. relay outputs to the respective
requirements. The adjustment / calibration of the transmitters 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 in 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
G1/2” ISO or
1/2” NPT
