Setting The Pressure Regulator For Sweeping With Compressed Air / Inert Gas; Figure 22: Pressure Regulator For Compressed Air Sweeping On The Chamber Rear, Top Right; Figure 23: Analog Pressure Display (Manometer) For Compressed Air Sweeping On The Chamber Front - Binder VDL Series Operating Manual

9.2 Setting the pressure regulator for sweeping with compressed air / inert
gas
After opening the pressure regulator on the chamber rear (turn clockwise), the area for electrical equip-
ment of the oven and the controller housing will be swept. Compressed air or inert gas is used and then
released into the surrounding atmosphere independent of the oven's operating state.
Compressed air sweeping must be in operation for at least 10 minutes before turning on the chamber. It
remains in operation during the entire use of the chamber (loading, drying, removal of the material to be
dried), with an overpressure of at least 25 Pa (recommendation: 40 Pa). After terminating the drying pro-
cedure and turning off the chamber it is recommended to continue sweeping for approx. 10 minutes.
On the chamber front there is an analog pressure display (manometer) to show the existing overpressure.
Figure 22: Pressure regulator for compressed air
sweeping on the chamber rear, top right
Sweeping before starting up the chamber:
• Open the USB cover on the controller housing (triangle instrument box)
• Turn the pressure regulator until the end stop to the lock nuts (turn clockwise).
• Recommended time for sweeping with maximum overpressure: 10 minutes. This flushes 5 times the
volume of the electrical installation area and controller housing
• Close the USB cover on the controller housing (triangle instrument box)
• Now the pressure regulator can be turned back (turn counterclockwise) until there is an overpressure
of at least 25 Pa (recommendation: 40 Pa).
Sweeping during chamber operation:
• Set the pressure on the pressure regulator in a way that the manometer shows at least 25 Pa over-
pressure. Recommended value: 40 Pa.
• Check the display frequently during chamber operation. In all operating states, the value on the ma-
nometer must indicate > 25 Pa.
• The USB cover on the controller housing must be closed.
Sweeping after completion of chamber operation (recommended):
• You can stop sweeping 10 minutes after turning off the chamber: Close the pressure regulator to (turn
counterclockwise).
• Check on the manometer that there is no longer any overpressure.
Regarding use of the USB connection during chamber operation please observe the instructions
given in chap. 21.1.
VDL (E3.1) 06/2020
Figure 23: analog pressure display (manometer)
for compressed air sweeping on the chamber front
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