Dry chambers

Vacuum drying chambers are used for drying very sensitive substances and when it is necessary to guarantee excellent residual drying. They generally need a very good ultimate vacuum depending upon the degree of drying, maximum acceptable temperature and the solvents used. At certain process parameters there are large quantities of vapors that can only be handled with pump systems of a sufficiently large volume flow rate.

Process requirements

medium to high vacuum requirements
optimum heat transmission to the sample material for time-saving drying
large vapor quantities have to be pumped off depending upon the sample material
condensate and droplet separation between the drying chamber and pump

Demands made of the vacuum pump

with aqueous samples: oil-free diaphragm vacuum pumps (not necessarily a design resistant to chemicals) or oil-sealed rotary vane pumps for a high ultimate vacuum
excellent chemical and condensate compatibility for drying samples containing solvents
for drying ovens previously pumped with water-jet pumps or house vacuum: Pumps with ultimate vacuum of as much as 7 mbar
pump protected from particles and droplets of liquid with a vacuum inlet separator (AK)
emission condenser for solvent recovery minimizes environmental and laboratory air pollution
for applications with large amounts of inflammable solvents: Use pumps and gauges with ATEX-Approval