VDL (E3) 09/2019 Page 26/234
X Specific operating conditions:
• Technical ventilation required
• Equipotential bonding
• Sweeping the area for electrical equipment for at least 15 minutes before turning on
• Ambient temperatue 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 (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 classi-
fication.
• Heating pipes: Zone 2 is possible at the place of installation
There is no risk of ignition from these mechanical components. No classification
• Safety temperature limiter (TL): Mechanical temperature monitoring by means of an expansion ves-
sel, which acts on a relay, which leads to the heating being switched off, and on a self-holding circuit,
which is reset by disconnecting the power plug. No classification
The expansion vessel is located in the area of the heating piping (zone 2 possible). It is a purely me-
chanical component with no risk of ignition.
The relay and self-holding circuit are 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) in connection with the measuring isolating
converter
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 switch (limit switch and relay) 100 mbar
It is located in the overpressure-swept electrical installation area. No classification
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