WIKA TR21 Serie Informations Complémentaires page 14

3. Commissioning, operation / 4. Special conditions for safe ...
Model TR21-C
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associated
Intrinsically safe
electrical
supply or suitable
equipment
barrier
EN
Non-hazardous
area
Hazardous area
Process
connection
4. Special conditions for safe use (X conditions)
1. Thermal backflow from the process, that exceeds the permissible ambient temperature
of the transmitter or the cases, must not occur and must be prevented by the installation
of suitable heat insulation or a neck tube of suitable length.
2. The wall thickness is greater than 0.2 mm and less than 1 mm. Thus the instruments
must not be subjected to ambient stresses that may have an adverse effect on the
partition. Alternatively, a thermowell of suitable minimum wall thickness may be used.
3. When using a thermowell/neck tube, the overall instrument must be designed such that
it allows installation in a way that results in a sufficiently tight gap (IP67) or a flameproof
gap (EN/IEC 60079-1) towards the less hazardous area.
4. The ambient temperature range (T
moulded M12 x 1 connector is limited to -20 ... +80 °C.
5. The ambient temperature range (T
is limited to -40 ... +85 °C.
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Intrinsically safe Intrinsically safe
supply or suitable supply or suitable
barrier
Non-
hazardous
area
Hazardous
area
Hazardous
area
) for variants with optional connection cable with
a
) for variants with optional EN 175301 M12 adapters
a
Intrinsically safe
supply or suitable
barrier barrier
WIKA additional information model TR21 (Ex i)
Intrinsically safe
supply or suitable
barrier
welded