Special Conditions For Safe Use (X Conditions) - WIKA TR Serie Instructions Complémentaires

3. Commissioning ... / 4. Special conditions for safe use ...
Observe the special conditions (see chapter 4 "Special conditions for safe use
(X conditions)", point 5).
Alternatively, a thermowell of suitable minimum wall thickness may be used by the
customer. For this, observe the special conditions (see chapter 4 "Special conditions for
safe use (X conditions)", point 6).

4. Special conditions for safe 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)
WIKA additional information, models TRxx and TCxx (Ex i)
) to ground potential. Potential equalisation shall exist in the
EN
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