3B Scientific Rotary-Vane Vacuum Pump, Two-Stage - Manual (Page 6)

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2. Description
The rotary-vane pump U34000 must only be used in
vacuum experiments to depressurize vacuum con-
tainers. It is not designed for commercial use.
The pump U34000 is a high performance, compact,
two-stage, oil-sealed rotary vane pump. It is protected
against thermal overload and equipped with an ex-
haust filter to reduce oil mist, a manometer and a
ventilation valve.
For reasons of transport the pump is delivered with
no oil in the reservoir. In the package you should find
a bottle of oil, sufficient for the first filling.
The pump is equipped with a voltage selector switch
(refer to fig. 1), so that it can be operated with mains
voltages of 110 V or 230 V plus or minus 10 %.
3. Technical data
Power supply: 110 – 120 V, 60 Hz
220 – 240 V, 50/60 Hz
Suction capacity: 100 l/min
Final pressure: 3x10 -1 Pa
Motor power: 245 W
Oil capacity: 350 ml
Manometer: 0 – 1000 mbar
Hose nipple: 10 mm dia.
Dimensions: approx. 335x138x250 mm 3
Weight: approx. 11 kg
Ambient temperature: 5° – 40° C approx.
4. Operation
4.1 General information
• After unpacking, please place all parts of the
package (bags, boxes, polystyrene sides) away
from the reach of children.
• Check the presence of the data label on the hos-
ing. If the label is not present, do not use the
pump and inform the supplier.
• In case you need to send back the pump to the
distributer (e.g. repair) drain the oil.
• For the disposal of the oil adhere to the local
regulations.
4.2 Before operating the pump
• Place the pump horizontally on a stable support.
• Do not connect the pump yet to the mains volt-
age.
• Check that the voltage selector switch is set to the
local mains voltage and ensure that the power
switch is in the OFF position before connecting
the pump to a power source.
• Remove the oil fill cap and add oil until it shows
at the bottom of the sight glass. Refer to the
technical data for the correct oil capacity of the
pump.
• Screw back the oil fill cap, remove the cap from
the hose nipple and open the stopcock.
• Turn the motor switch to ON position.
• When the pump runs smoothly put the cap back
onto the hose nipple and close the stopcock. This
may take 2 to 30 seconds depending on the am-
bient temperature.
• After the pump operates for approximately one
minute, check the sight glass for proper oil level,
which should be aligned with the sight glass oil
level line. Refill oil if necessary.
Note: Insufficient oil filling will result in poor vacuum
performance. Excessive oil can result in overflowing of
oil from the exhaust fitting.
Fig. 1 A voltage selector switch, B power switch, C socket
4.3 To shut off the pump after use
To prolong life span of the pump and a smooth start-
up, these procedures to shut off the pump should be
followed.
• Close the stopcock.
• Remove the hose from the hose nipple.
• Switch off the pump and open the stopcock for a
few seconds to relieve any vacuum inside the
pump.
• Place the cap on the hose nipple to prevent any
contamination or foreign particles from entering
it.
4.4 Maintenance
4.4.1 Vacuum pump oil
The condition and the type of oil used in any high
performance vacuum pump are extremely important
in determining the ultimate attainable vacuum. It is
recommended to use the high performance vacuum
pump oil, which is specifically blended to maintain
maximum viscosity at normal running temperatures
and to improve cold weather start up.
4.4.2 Oil change
• Ensure that the pump is warmed up.