Atex Code Description; Production Identification - Formula Air Rva-X Serie Wartungshandbuch

For Dust :
Zone 20 : An area in which an explosive atmosphere in the form of a cloud of combustible dust in air is present
continuously, frequently or for extended periods of time.
Zone 21 : An area in which an explosive atmosphere in the form of a cloud of combustible dust in air is likely to occur
occasionally in normal operation.
Zone 22 : An area in which an explosive atmosphere in the form of a cloud of combustible dust in air is not likely to
occur in normal operation but, if it does occur, will persist for a short period only.
The ATEX 2014/34/EU Directive classifies the protection system (in this case the rotary valve) into 3 categories, with
direct protection levels, guaranteed to the related protection.
6.2

ATEX code description

The RVA-X ATEX rotary valve is marked according to the European Directive 2014/34/EU :
II 1/-D Ex h IIIB T135°C Da/-
Ta = -20°C to +60°C
II 1/2D Ex h IIIB T135°C Da/Db
Ta = -20°C to +60°C
II 1/3D Ex h IIIB T135°C Da/Dc
Ta = -20°C to +60°C
In which:
II : Equipment group II for use above ground,
1/ : Category 1D, suitable for use with zone 20, 21 or 22 internally,
-D : No category externally, suitable for use in non-hazardous area,
2D : Category 2D, suitable for use with zone 21 or 22 externally,
3D : Category 3D, suitable for use with zone 22 externally,
Ex h : Mechanical parts are protected by constructional safety "c",
IIIB : Dust group IIIB for use with non-conductive dust types of groups IIIA and IIIB,
T135°C : Maximum surface temperature 135°C,
Da/ : Equipment Protection Level Da, suitable for use with zone 20, 21 or 22 internally,
- : No EPL externally, suitable for use in non-hazardous area,
Db : Equipment Protection Level Db, suitable for use with zone 21 or 22 externally,
Dc : Equipment Protection Level Db, suitable for use with zone 22 externally,
Ta : Allowed ambient temperature range.
6.3

Production identification

The identification of Formula Air Group as manufacturer of the RVA-X ATEX rotary valve is linked to the conformity
assessment with the current legislation by means of the following :
• Declaration of conformity according to Directive ATEX 2014/34/EU
13
User manual | RVA Rotary valves ATEX
www.formula-air. com
Protection Level
Very High
High
Normal
Plant
Dust category
1D (zone 20)
2D (zone 21)
3D (zone 22)