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5. Special conditions of use (X-conditions)
Hazardous gas atmosphere
Required
temperature class
(ignition
temperature of
EN
gas or vapour)
T6 ( T > 85 °C)
T5 ( T > 100 °C)
T4 ( T > 135 °C)
T3 ( T > 200 °C)
1) only for instruments without option liquid filled
Hazardous dust atmosphere:
The maximum surface temperature to be considered depends on the media
temperature and the ambient temperature whichever is higher.
The selection according to the ignition temperature of the gas, vapour or dust and
ambient temperature shall be according EN 60079-14 chapter 5.6. The maximum
surface temperature shall not reach the ignition temperature of any gas, vapor or
dust which may be present.
Explosive atmosphere consisting of hybrid mixtures
The instruments must not be used in areas in which an atmosphere consisting of
explosive hybrid mixtures (dusts mixed with gases) can occur.
3)
Restrictions of the installation environment.
Mount the instrument in such a way that, taking into consideration the influence
of convection and heat radiation, no deviation above or below the permissible
ambient and media temperatures can occur.
4)
Earthing of instrument
The instruments must be earthed via the process connection. This is why
electrically conductive sealing should be used at the process connection.
Alternatively, take other measures for grounding. External sources of stray electric
currents depend on end use application and must be assessed by the end user.
5)
Avoidance of materials which can react with the instruments material
(liable to spontaneous combustion)
Avoid handling of materials that react dangerously with the materials used for the
instrument, and substances liable to spontaneous combustion.
8
Maximum permissible surface
temperature
(for the end application)
+80 °C
+95 °C
+130 °C
+195 °C
WIKA additional operating instructions, model TG58SA (ATEX)
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