Labconco RapidVap Vacuum, N2 and N2/48 Evaporation Systems 7910015 - Manual (Page 11)

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Chapter 2: Prerequisites
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Vacuum Pump
Requirements
A vacuum pump must be provided by the user. For
most applications, it is recommended that the vacuum
pump is capable of a free air flow of 88 L/min and 29.0
inch Hg (31 mbar) vacuum although, in some
applications other pumps may be satisfactory or be
required. The inlet fitting on the vacuum pump must be
suitable for 0.50 I.D. hose.
Biological samples, for example, are often dissolved in
water, a high boiling point solvent, and are often heat
liable. Such samples require the high vacuum
achievable with a mechanical vacuum pump, usually
with an ultimate vacuum of 1.3 x 10
-4 mBar to achieve
a good evaporation rate.
On the other hand, samples dissolved in methylene
chloride, a low boiling point solvent, can be efficiently
concentrated using a water aspirator.
The nomograms in Chapter 4: Using Your RapidVap
will help determine the boiling point of a solvent at
pressures below atmospheric. This can serve as a guide
to the appropriate vacuum source.
TO INSURE THAT AGGRESSIVE
SAMPLES USED IN THE RAPIDVAP
DO NOT DAMAGE THE VACUUM
PUMP, IT IS RECOMMENDED THAT
ALL INTERNAL WETTED PARTS
ARE PTFE OR PTFE COATED. TO
PREVENT A HAZARDOUS
CONDITION, THE PUMP MUST BE
SUITABLE FOR HANDLING THE
VAPORS FROM THE SOLVENTS
THAT WILL BE EVAPORATED IN
THE RAPIDVAP.
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