WIKA TR Serie Zusatzinformation Seite 15

4. Special conditions of use (X conditions)
4. Special conditions of use (X conditions)
1) Versions with Ø < 3 mm or "grounded measuring points" do not comply to clause
6.3.13 of IEC/EN 60079-11 because of the kind of use. By that from a safety-related
view this intrinsically safe circuits shall be considered as galvanically connected
("quasi grounded"
complete course of the erection of the intrinsically safe circuits. Furthermore, for the
connection the requirements of IEC/EN 60079-14 shall be considered.
2) For instruments that do not comply to the electrostatic requirements of
IEC/EN 60079-0 and IEC/EN 60079-26 due to their construction, electrostatic charging
shall be avoided.
3) The used transmitters/digital displays shall be provided with their own EC-type
examination certificate in accordance with IEC. The installation conditions, electrical
connection values, temperature classes resp. the maximum surface temperatures of
instruments for the use in explosive dust atmospheres and the permissible ambient
temperature shall be taken from the corresponding EC-type examination certificates
and shall be considered.
4) A reverse heat flow from the process exceeding the permissible ambient temperature
of the transmitter, digital display or enclosure is not allowed and shall be avoided by a
suitable thermal insulation or a suitable neck length of the tubing.
5) In case of a wall thickness less than 1 mm, the instrument may not be exposed to
environmental conditions which may negatively affect the partition wall. A thermowell
with a suitable minimum wall thickness can be used alternatively.
6) Using a thermowell/neck tube the instrument shall be constructed in a way that allows
an installation that results in a sufficiently tight joint (IP66 or IP67) or a flameproof joint
(IEC/EN 60079-1) in the direction of the less endangered area.
7) Not relevant for this instrument (see X conditions in EC-type examination certificate)
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
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.
WIKA additional information, models TRxx and TCxx (Ex i)
) to ground potential. Potential equalisation shall exist in the
EN
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