WIKA 831 Manual De Instrucciones página 10

3. Safety
Gas hazardous area
Required temperature class
(ignition temperature)
T6
T5 ... T1
EN
Dust hazardous area
Maximum surface temperature
T135°C
T95°C (only with NS 63)
The installation should be made in such a way that the temperature range of the instrument,
also considering the effects of convection and thermal radiation, neither exceeds nor falls
below the permissible limits.
The permissible temperature ranges of the contact models must not be exceeded at the
instrument either. If necessary, measures for cooling (e.g. syphon, instrumentation valve,
diaphragm seal etc.) have to be taken.
Compliance with the permissible temperature range during operation must be ensured
by the operator. The area shown in the following picture under "T-Ref" can be used for this
purpose.
Pressure gauge
10
T-Ref
Pressure gauges with inductive contact model 831, for hazardous areas
Permissible temperature range at the
instrument
-20 ... +60 °C
-20 ... +70 °C
Permissible temperature range at the
instrument
-20 ... +60 °C (+70 °C optional)
-20 ... +60 °C (+70 °C optional)
Differential pressure gauge
T-Ref