Hoefer GD2000 - Manual (Page 12)

Setting Up the Vacuum System
The vacuum system must include a vacuum
pump capable of moving an air volume of
at least 1.5 m
3 /h, but not more than 6 m 3 /h.
Rotary-vane-type pumps require both a chemi-
cal vapor trap and a cold trap (set to maximum
cooling) to remove vapors that may damage
the pump.
If you are using the VP200 Chemistry
Diaphragm Pump, no traps are required because
the pump is constructed of chemically resis-
tant materials and is equipped with two vapor
trap flasks. A cold trap is optional but can be
installed to control the amount of vapor released
to the atmosphere.
1
Attach the vacuum tubing (9 mm ± 1 mm i.d.)
from the vacuum pump to the vacuum port on the
GD2000.
2
Plug the vacuum pump either into the dryer control
cabinet (the power cord receptacle is on the left side
of the control panel) or into a lab power receptacle.
When the pump is plugged into the dryer control
cabinet, the vacuum timer automatically turns the
pump on and off. The 115 V~ model pump receptacle
can accommodate any pump that draws less than 5 A.
The maximum rating for the 230 V~ model is 2.5 A.
If your pump exceeds this rating, plug it into a lab
receptacle and manually turn the power on and off.
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Note: We recommend a
diaphragm vacuum pump such
as the VP200 because the pump
is chemically resistant to the
liquids and vapors removed from
the gel during drying. A water
aspirator or house vacuum is
insufficient for gel drying.