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VDL (E3.1) 10/2020 Page 45/196
3.5.1 Area classification inside the chamber
Figure 7: Area classification of the closed chamber
(view without housing, insulation, heater and outer chamber)
(A) Controller housing (swept with compressed air)
(D) Electrical installation area (swept with compressed air)
(H) Inner chamber (usable volume)
(7) Plug “Manual ventilation” for emergency ventilation
(4) Universal connection for inert gas / ambient air “GAS/AIR”
(5) Additional universal connection for inert gas / ambient air “GAS/AIR 2” (option)
(6) Vacuum connection
(12) Measuring connection
(13) Preheating chamber between the inner and outer chamber (swept with compressed air)
Occurrence of an explosive atmosphere:
Occasionally: Inner chamber with tubing / line to the vacuum pump, and connections
(A)
(D)
(5)
(4)
(7)
(6)
(H)
(12)
(13)
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