VD (E2.1) 07/2017 page 12/96
2. Description of the equipment
Vacuum drying is used for special drying problems, for which conventional drying methods cannot offer a
solution due to physical limitations.
All functions of the multifunctional program control can be set simply and conveniently via the easy to
understand function keypad of the RD3 temperature program controller. This controller is equipped with
touch function keys and a digital display and permits exact temperature setting and programming
temperature cycles. The VD provides almost unlimited possibilities of adapting to individual customer
requirements based upon extensive programming options and on the week program timer and real time
clock of the controller.
The inner chamber is made of especially corrosion resistant stainless steel V4A (German material no.
1.4404 2B, US equivalent AISI 316L) micro-polished. The rack holder and all of the chamber's vacuum
connections and valves are made of especially corrosion resistant stainless steel V4A (German material
no. 1.4571, US equivalent AISI 316Ti). The housing is RAL 7035 powder-coated. All corners and edges
are also completely coated. When operating the chamber at temperatures above 150 °C / 302 °F, the
impact of the oxygen in the air may cause discoloration of the metallic surfaces (yellowish-brown or blue)
by natural oxidation processes. These colorations are harmless and will in no way impair the function or
quality of the chamber.
The chambers are jacket-heated. The APT.line™ preheating chamber technique ensures a completely
homogeneous jacket temperature, ensuring uniform heat transfer into the inner chamber. The low-loss
heat transfer to the material uses the patented aluminum vacuum expansion racks (or optionally available
in stainless steel). The elastic-mounted safety glass window reliably compensates any overpressure or
explosions that may occur. The additional polycarbonate panel ensures proven and effective splinter
protection in the event of an implosion.
All VD chambers provide an inert gas connection and a measuring connection serving to connect a
vacuum controller or a measuring access port.
The chambers are equipped as standard with a large-surface safety valve. The toughened safety glass
window is elastic-mounted and in the event of explosion serves as a safety valve. The additional plastic
panel provides splinter protection.
The chambers are equipped with a serial interface RS 422 for computer communication, e.g. via the
communication software APT-COM™ 3 DataControlSystem (option, chap.16.8). For further options, see
chap. 20.3.
All installable items, such as racks and rack holders, can be easily removed. The completely smooth
inner chamber with its rounded corners and internally welded seams is easy to clean.
The minimum working temperature of the vacuum drying oven is approx. 15 °C / 27 °F above room
temperature. The maximum temperature is 200 °C / 392 °F.
Vacuum pumps with a suction capacity of 1 m
3
/h to 30 m
3
/h are suitable for the VD vacuum drying oven.
The permissible end vacuum is 10
-2
mbar / 0.0003 inHg.
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