6
Operating instructions for EE360 Moisture in Oil Transmitter
Connection terminal block
RS485
add on chip
Space for
optional modules
Fig. 2
Modular enclosure
2.2 Probes
The EE360 remote probe can be employed over the T range -40...180
(-40...356 °F),
up to
20 bar
(300 psi)
and is available with 100 mm
(3.94”)
, 200 mm
(7.87”)
and 400 mm
(15.75”)
length.
maximum installation depth
minimum installation depth
23
(1”)
code “probe length”
1)
code “cable length”
1)
32
(1.3”)
64 mm
(2.5”)
for 100 mm
(3.94“)
probe /
164 mm
(6.5”)
for 200 mm
(7.87“)
probe
364 mm
(6.5”)
for 400 mm
(15.75“)
probe
∅
13
(0.51”)
∅
12
(0.47”)
15
(0.59”)
1) Refer to ordering guide
Fig. 3
EE360 probe
2.3 Water activity vs. water content
The moisture in oil can be expressed in absolute or relative terms.
•.
Water activity aw
is the relative measure for moisture in oil. It represents the ratio between the actual
amount of dissolved water and the maximum possible amount of dissolved water in the oil at a certain
temperature T. Independently of the oil type, the water activity shows how close to saturation is the oil
at a certain temperature.
aw=0 indicates completely dry oil, while aw=1 fully saturated oil.
EE360 measures directly the water activity.
•.
The
water content x
.is.an.absolute.measure.equal.to.the.share.of.water.(dissolved,.emulsified.or.
separate) in the oil. The water content is measured in ppm (parts per million) and is independent from
the oil temperature. For assessing how far is the oil from saturation, x must be regarded together with
T.
EE360 calculates x out of the measured aw and T values. The calculation is oil dependent and re-
quires.a.set.of.oil.specific.parameters..
(Contact an E+E representative for details.)
