Monitoring the unit's sensors/displays
OXiStop OXS
en
Page 38 / 108
MoWa OXS 3992763e en-us 2018-08-10.docx
2018-08-10
In fault-free operation, the measured pressure oscillates between approx. -
0.98 bar negative pressure and 0.5 bar positive pressure (20 mbar absolute
and 1500 mbar absolute).
The cycle time can range from 20 to 120 seconds and it is dependent on the
fluid temperature and the air content. The longer the cycle time and the lower
the negative pressure, the lower the air content is in the oil.
P
res
s
ur
e [
bar
]
Time [s]
A typical pressure curve while free air is to be found under the tank lid is
depicted on the left-hand side of the diagram. In doing so, the negative
pressure in the degassing unit reaches a value of > -0.5 bar (> 500 mbar
absolute). This kind of pressure curve is to be observed, among other times,
during commissioning, with larger-sized air intakes or when there are leaks.
Once the free air has been removed from the tank, a pressure curve arises
that is similar to that on the right-hand side of the diagram. In doing so, the
negative pressure in the degassing unit reaches a value of < -0.8 bar (< 200
mbar absolute).
Item
Designation
A
Positive pressure during the degassing phase
B
Negative pressure with high air content
C
Negative pressure with low air content
D
Cycle time
