Special Conditions For Use (X Conditions) - WIKA 55 Serie Información Adicional

3. Special conditions for use (X conditions)

Instruments for use in hazardous gas/air, vapour/air and mist/air
atmospheres:
Temperature class
(gas application)
T6
T5
T4
T3
T2
T1
1) only for instruments without liquid filling
Hazardous dust atmosphere
For dusts, the procedure specified in ISO/IEC 80079-20-2 for
determining the ignition temperature has to be applied. The
ignition temperature is determined separately for dust clouds and
dust layers, respectively. For dust layers, the ignition temperature
depends on the dust layer thickness per EN/IEC 60079-14.
Ignition temperature
of dust
Dust cloud T
cloud
Dust layer T
layer
The permissible maximum medium temperature must not exceed
the lowest determined value, even in case of a malfunction.
3) 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 medium temperatures can
occur.
WIKA additional information model 55 (ATEX)
Maximum permissible surface
temperature (for the end application)
+65 °C
+80 °C
+105 °C
+160 °C
+240 °C
+250 °C (+360 °C)
Maximum permissible medium
temperature (in the measuring system)
< 2/3 T
cloud
< T − 75 K − (reduction depending on the
layer
layer thickness)
1)
EN
9