WIKA TR Serie Instructions Complémentaires page 16

4. Special conditions for safe use (X conditions)
8) For the use of enclosures they shall either be provided with their own EC-type
examination certificate or they shall comply to the minimum requirements.
IP protection: At least IP20 (at least IP6x for dust), applies to all enclosures.
Light metal enclosures, however, shall comply with clause 8.3 and 8.4 of
EN
IEC/EN 60079-0. Non-metallic enclosures or powder-coated enclosures shall also
comply with 7.4 of IEC/EN 60079-0 or have a corresponding warning marking.
9) Accessible parts of metallic enclosures which are not connected to ground and
accessible parts of metallic enclosures which are connected to ground but do
not comply to clause 6.5 of IEC/EN 60079-11, shall comply with clause 7.5 of
IEC/EN 60079-0 or have a corresponding warning marking.
10) In case it is impracticable to include the ambient temperature range within the marking
of the instrument, because the instrument is a small instrument according to 29.10
of IEC/EN 60079-0, the ambient temperature range shall be specified in the supplied
manual. If the instrument is not a small instrument according to 29.10 of IEC/EN 60079-0
and the ambient temperature range is not included within the marking, the marking shall
additionally include an advisory marking referring to the supplied manual.
Protection measures for applications that require EPL Ga or Da:
Operationally based friction or impacts between light metal instrument components or their
alloys (e.g. aluminium, magnesium, titanium or zirconium) and instrument components
from iron/steel, are not permitted. Operationally based friction or impacts between light
metals are permitted.
16 WIKA additional information, models TRxx and TCxx (Ex i)