Level limit switch
Series VN 1000 / 2000 / 5000 / 6000
Technical information / Instruction manual
page
Zone classification
usable in zone
ATEX
category
IEC-Ex
Equipement
Protection Level (EPL)
Dust applications 20, 21, 22
1 D
Da
21, 22
2 D
Db
22
3 D *
Dc
Gas applications
0, 1, 2
1 G
Ga
1, 2
2 G
Gb
2
3 G
Gc
General Notes
Notes for use in Hazardous Locations
* in case of conductive dust additional
requirements for the installation may
be necessary
Specific condition of use
Electrostatic
charge
Because the enclosure of the equipment is made of aluminium alloy, the apparatus must be installed
so, that even in the event of rare incidents, an ignition source due to impact or friction between the
enclosure and iron/steel is excluded, when used in a potentially explosive atmosphere requiring
apparatus of equipment category 1 G.
Cleaning of the equipment should be done only with a damp cloth.
Marking
Devices with Ex approval are marked on name plate.
Process pressure
Devices with Ex Approval are approved for atmospheric pressure.
A detailed explanation is given below for ATEX and applies analogously for other Ex approvals:
The scope of the ATEX directive is generally limited to atmospheric pressure, see ATEX directive
2014_34_EU Chapter 1 Art.2 (4).
Atmospheric pressure is defined as absolute pressure 0.8bar to 1.1bar, see ATEX guideline §50 and IEC
60079-0 chapter 1 Scope.
The technical background is that an explosive atmosphere which is compressed (overpressure) or
released (underpressure) can exhibit different explosion behaviour than under atmospheric conditions.
The standards for the types of protection against explosion (IEC 60079 series), on which a type
approval according to the ATEX directive is based, are designed for atmospheric conditions and do not
automatically cover deviating pressure conditions.
Thus, an ATEX type approval issued in accordance with this directive only covers atmospheric
pressure.
This applies to all manufacturers.
A deviating operating pressure can be assessed and approved by an expert for the respective
application.
Regardless of this, the design of the level indicators is suitable for a vessel overpressure /
underpressure in accordance with the specified technical data.
Process and ambient
temperature
The permitted temperature ranges are marked on the name plate.
The max. permitted ambient and process temperatures (including temperature derating) stated in this
manual must be observed.
Vibranivo
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VN 1000 / 2000 / 5000 / 6000 g
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