Operation
In cyclic operation, the TRIVAC B should not be switched
off during the intervals between the individual working
phases (power consumption is minimal when the pump
is operating at ultimate pressure), but should continue to
run with gas ballast valve open and intake port closed (if
possible via a valve).
Once all vapours have been pumped off from a process
(e.g. during drying), the gas ballast valve can be closed
to improve the attainable ultimate pressure.
2.5.3 Operating Temperature
Proper operation of the TRIVAC B is ensured in the
ambient temperature range between 12 °C to 40 °C
(55 °F to 104 °F).
At operating temperature, the surface
temperature of the oil case may lie between
40 °C and over 80 °C, depending on the
load.
There is the danger of receiving burns.
If – due to the ambient conditions – this temperature
range is exceeded at either end of the range, then the
operating range of the TRIVAC B can be adapted.
The Leybold sales department will be pleased to answer
any questions in this matter.
13
2.5 Operation
TRIVAC B pumps can pump condensable gases and
vapours, provided that the gas ballast valve (7/5) is open
and the pump has attained its operating temperature.
2.5.1 Pumping of Non-Condensable Gases
If the process contains mainly permanent gases, the
pump may be operated without gas ballast, provided that
the saturation vapour pressure at operating temperature
is not exceeded during compression.
If the composition of the gases to be pumped is not
known and if condensation in the pump cannot be ruled
out, run the pump with the gas ballast valve open in
accordance with Section 2.5.2.
2.5.2 Pumping of Condensable Gases
and Vapours
With the gas ballast valve open and at operating
temperature, TRIVAC B pumps can pump pure water
vapour up to the water vapour tolerance specified by the
technical data. If the vapour pressure increases above
the permissible level, the water vapour will condense in
the oil of the pump.
When pumping vapours ensure that the gas ballast valve
is open and that the pump has warmed up for
approximately 30 minutes with the intake line closed.
Vapour phases may only be pumped up to
the permissible limit after the pump has
attained its operating temperature.
During pumping, vapours may dissolve in
the oil. This changes the oil properties and
thus there is a risk of corrosion in the pump.
Therefore, don’t switch off the pump
immediately after completion of the
process. Instead, allow the TRIVAC B to
continue operating with the gas ballast
valve open and the intake line closed until
the oil is free of condensed vapours.
We strongly recommend operating the
pump in this mode for about 30 minutes
after completion of the process.
Caution
Warning
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