WIKA TR Serie Zusatzinformation Seite 16

4. Special conditions of use (X conditions)
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
EN
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)