BINDER VD 23 - Manual (Page 23)

VDL (E2.1) 04/2014 page 23/107
2. Description of the equipment
The VDL vacuum drying oven has been inspected by the TÜV Product Service GmbH in accordance with
all safety-relevant guidelines and bears the TÜV-Mark P mark. Consequently, it is also expressly ap-
proved for drying materials with unlimited quantities of organic solvents.
The regular model is equipped with an explosion proof inner chamber. The Ex classification of inner
chamber according to ATEX Directive 94/9/EC is
II -3G IIB T3-T1 Gc X. The description of explosion
protection on the type plate determines the classification.
Maximum temperature of the inner surfaces: 320 °C / 608°F.
The temperature class of the inner chamber acc. to IEC 60079-14: depends on the setting of the tempera-
ture safety device and can be T1, T2 or T3. The temperature class of the entire unit equals the tempera-
ture class of the inner chamber.
All functions of the multifunctional program control can be set simply and conveniently via the easy to un-
derstand 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 temper-
ature cycles. The VDL provides almost unlimited possibilities of adapting to individual customer require-
ments 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 unit's vacuum connec-
tions 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 natu-
ral oxidation processes. These colorations are harmless and will in no way impair the function or quality of
the unit.
The vacuum drying ovens in the APT.line™ are jacket-heated. The APT.line™ preheating chamber tech-
nique 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 V4A, 1.4571). 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 VDL units provide an inert gas connection, a compressed air connection for sweeping the area for
electrical equipment, and a measuring connection serving to connect a measuring access port.
The VDL vacuum drying oven is equipped with a serial interface RS 422 for computer communication, e.g.
via the communication software APT-COM™ 3 DataControlSystem (option, chap.15.6). For further op-
tions, see chap. 19.3.
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 VDL 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 VDL vacuum drying oven.
The permissible end vacuum is 10 -2 mbar / 0.0003 inHg.