Starting up the unit
FAM 5
en(us)
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BEWA FAM5 3667663b en-us 2012-12-12.doc
2012-12-12
Setting the underpressure in the vacuum column
Use the vacuum gauge (3.68) to set the underpressure in the vacuum
column and check the vacuum on the vacuum pressure gauge (3.37).
Note that the pressure to be set in the vacuum column is dependent on the
operating viscosity, the water content and the air content.
The following settings are guiding values:
Medium
Operating viscosity
Pressure setting
Hydraulic oil
50 mm²/s
-0.6 bar = 400 mbar (absolute)
Lubricant
300 mm²/s
-0.4 bar = 600 mbar (absolute)
Some oils foam intensively when they enter the vacuum chamber. This effect
is particularly pronounced with high water or gas contents. This effect is also
to be observed with older oils or extremely high-viscosity media.
If too much foam is caused, it is drawn in by the vacuum pump. In this case,
reduce the vacuum from -0.6 to -0.4 bar.
Water condensation can also occur in the connecting hose between the
vacuum pump and the vacuum column in the presence of a very high water
content in the oil. The water is separated out into the vacuum pump storage
container. Reduce the vacuum to -0.3 bar in such cases.