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VDL (E3.1) 10/2020 Page 24/196
X Specific operating conditions:
• Technical ventilation required
• Equipotential bonding
• Sweeping the area for electrical equipment, preheating chamber, and controller housing be-
fore start-up and during operation
• Ambient temperature during operation: +18 °C up to +32 °C.
• Use only humid cloths to wipe the chamber.
The “VDL vacuum drying oven” assembly includes the following components and devices in the
sense of the ATEX directive 2014/34/EU:
• Inner chamber (interior for drying material): Container, not a device in the sense of the ATEX directive
2014/34/EU)
It is a purely mechanical component with no risk of ignition. No classification.
• Outer chamber (limitation of the preheating chamber to the outside): Container, not a device in the
sense of the ATEX directive 2014/34/EU)
It is a purely mechanical component with no risk of ignition. No classification.
• Control (controller)
The controller is located in the overpressure-swept controller housing (instrument triangle). No classifi-
cation.
• Safety temperature limiter (TL): thermal switch (bimetal switch) for temperature monitoring, which
leads to the heating being switched off, and a self-holding circuit, which is reset by disconnecting and
reconnecting the power plug. No classification
The thermal switch is located in the overpressure-swept preheating chamber. The self-holding circuit is
located in the overpressure-swept electrical installation area.
• Pt 100 controller sensor and heating sensor
Both sensors are located on the heating piping (zone 2 possible)
Ex [ic] Ignition protection Intrinsic safety “I” per EN IEC 60079-11
Mechanical component
Equipment protection level: Increased protection “ic”, suitable for placement in Zone 2
II 3 G Ex ic IIB T3 Gc
• Optional Object temperature sensor (simple equipment) with barrier (isolation amplifier)
Ex [ib] Ignition protection Intrinsic safety “I” per EN IEC 60079-11
Equipment protection level: high protection "ib", suitable for placement in Zone 1 (chamber
interior) or 2
II 2 G Ex ib IIB T3 Gb
• Pressure sensor with barrier (isolation amplifier)
Ex [ib] Ignition protection Intrinsic safety “I” per EN IEC 60079-11
Equipment protection level: high protection “ib”, suitable for placement in Zone 1 (chamber
interior) or 2
II 2 G Ex ib IIB T3 Gb
• Pressure limit switch and relay, 100 mbar
It is located in the overpressure-swept electrical installation area. No classification
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