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3B SCIENTIFIC® PHYSICS
U21850 Vacuum experiment plate
Instruction sheet
7/03 ALF
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Vacuum experiment plate and vacuum bell jar are used
to set up a vacuum chamber for experiments in the coarse
(low) and fine vacuum range.
1. Safety instructions
• Protect the surface of the vacuum experiment plate
from moisture, chemicals and mechanical affects to
guarantee that the system remains vacuum-tight.
• Before conducting experiments check the vacuum
bell jar for any damage (entrapped air does not en-
danger operating safety).
• Defective vacuum bell jars could implode.
2. Description, technical data
2.1 Vacuum experiment plate
The vacuum experiment plate comprises a metal plate
with rubber sealing ring mounted on a tripod and two
cock valves used for hose connection on the pump side
as well as for ventilation. A center bore hole with M12
thread is used to secure experiment equipment. A
vacuum-tight power feed with 4-mm safety sockets and
two cables with 4-mm safety plugs are available for the
power supply.
Diameter:
250 mm
Height:
90 mm
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com • Technical amendments are possible
U21851 Vacuum bell jar
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Metal plate mounted on tripod stand
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Power feed using connection cables and safety sockets
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Rubber sealing ring
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Centre bore hole with M12 thread
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2 cocks for hose connection and for ventilation
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Grip knob
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Polished flange
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4-mm safety plug
Current feed-through: 2-pole with 4-mm
safety sockets (red, black)
Power feed:
via 2 cables approx. 1 m in length
(red, black) with 4-mm safety plugs
Electrical limiting specs: max. 48 V, max. 12 A
Vacuum connection:
2 hose nozzles 12 mm and 8 mm Ø
2.2 Vacuum bell jar
Vacuum bell jar made of glass with grip knob and pol-
ished flange to be placed on top of the vacuum experi-
ment plate U21850.
Inner diameter:
190 mm
Height:
220 mm
3. Operation
• Before performing the experiment check for any dam-
age to the vacuum bell jar.
• Make sure that the sealing ring as well as the polished
edge of the bell jar are dust-free.
• After performing the experiment ventilate the cham-
ber with the pump switched off and the evacuation
valve closed.
Additionally required:
1 Vacuum pump (e.g. membrane pump U14502)
1 Vacuum hose (e.g. U10140)
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