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VDL (E3.1) 10/2020 Page 23/196
1.8 Ex classification of the chamber and immediate surroundings
The VDL vacuum drying oven is an assembly in the sense of ATEX Directive 2014/34/EU with the following
Ex classification:
II 2/3/- G IIB T3 Gb/Gc/- X
Explanation:
II Use of the device above ground
2 Device category 2 per ATEX Directive 2014/34/EU
Suitability for areas in which explosive atmospheres may occur occasionally.
Inner chamber (drying chamber), tubing / line to the vacuum pump, areas inside the vacuum
pump. See images of the areas in Chap. 3.5.
3 Device category 3 per ATEX Directive 2014/34/EU
Suitability for areas in which explosive atmospheres may occur, on a rare and temporary ba-
sis:
The entire device, with the exception of the device plug, is designed in Device category 3 in
relation to the environment
Pt 100 controller sensor, Pt 100 heating sensor
Surrounding of the chamber, including loading area and outer side of the preheating chamber
(outer chamber), area of installation of the vacuum pump, pump module. See images of the
areas in Chap. 3.5.
- No category per ATEX Directive 2014/34/EU
Device power plug (unprotected device area).
With optional analog output: Plug connection of the analog output
The device power plug and the plug connection of the optional analog output are unprotected.
The electrical connection and the optional plug connection of the optional analog output must
therefore be established outside a zone.
See images of the areas in Chap. 3.5.
G Device category G per ATEX Directive 2014/34/EU
Gas: Do not introduce combustible dust into the chamber or allow combustible dusts to be
present in the vicinity of the chamber.
IIB Equipment group IIB
Substances falling under Gas group / Explosion group IIA or IIB are permitted.
Substances falling under Gas group / Explosion group IIC are not permitted.
T3 Temperature class of the inner chamber: T3 acc. to IEC 60079-0
Materials of temperature classes T4, T5, and T6 are not permitted. Introduce into the chamber
only materials whose auto-ignition temperature exceeds 200 °C / 392 °F
Gb Equipment protection level (EPL) Gb acc. to EN IEC 60079-0 / EN ISO 80079-36
Suitability for areas in which explosive atmospheres may occur occasionally.
Inner chamber (drying chamber), tubing / line to the vacuum pump.
Gc Equipment protection level (EPL) Gc acc. to EN IEC 60079-0 / EN ISO 80079-36
Suitability for areas in which explosive atmospheres may occur on a rare and temporary basis
(fault):
Chamber areas flushed with compressed air: Electrical installation area, electrical connection
of the heater, preheating chamber between the inner and outer chamber with heater tubes
(without electrical connections) and safety temperature limiter (TL
- No equipment protection level (EPL) Gc acc. to EN IEC 60079-0 / EN ISO 80079-36
Device power plug, plug connection of the optional analog output (unprotected device area)
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