Reducer of Fluid oXidation
Normal function
the final air content reached depends on the amount of air entering the system. The
vacuum function effect can be checked by the A-distance.
4. The A-distance is measured when the supply pressure for the RFX is off. When the
RFX is off power the vacuum inside the glass tube will fetch oil from The reservoir
until equalization is achieved. When the oil level sets, the A-distance can be
measured as a distance between the oil level and the top square (see page 12). This
distance should be more or less constant, if the working conditions have not been
changed. Note that the A-distance is only measured while the supply pressure is off.
5. The cycle time varies between 2-4 minutes depending on supply pressure and oil
condition. A high supply pressure as well as a low oil viscosity reduces the cycle
time. To a small extent the cycle time is reduced by a higher degree of vacuum.
During constant conditions the cycle time should be constant. This is a checkpoint in
proactive maintenance.
0
2
4
0,5
1
1,5
2
2,5
3
3,5
4
A-distance (cm) REDFOX C
6
8
10
12
Air content (%)
(60°C)
(20°C)
Diagram that showing the connection between air content in oil and the A-distance.
Normal air content is 10% at 20 degrees centigrade.
The diagram is valid at
atmospheric pressure
.
6. Foam thickness varies with a lot of factors as air content, water content, temperature,
pressure, impurities and oil type. The foam thickness is therefore not an easy way to
describe normal conditions. Foam indicates that the RFX is working and that there is
water and air ingested in the oil. Variations in foam thickness from one day to another
indicate that there have been changes. A rising water level or a rising air content can
be the reason. Check the A-distance if there are any doubts.
HYDAC FILTER SYSTEMS GMBH
us
Page 19 / 28
MoWa RFX 3570845 us 2010-08-20.doc
2010-08-19
