Binder vdl 23 - Area Classification Inside the Chamber; Figure 9: Area Classification of the Closed Chamber (View Without Housing, Insulation, Heater and Outer Chamber)

VDL (E3) 09/2019 Page 49/234
3.6.1 Area classification inside the chamber
Figure 9: 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
Occurrence of an explosive atmosphere:
occasionally
(A)
(D)
(5)
(4)
(7)
(6)
(H)
(12)