WIKA PGS23 - Page 10

T-Ref
T-Ref
Pressure gauges with inductive contact model 831, for hazardous areas10
14320154.01 06/2019 EN/DE
EN
Gas hazardous area
Required temperature class
(ignition temperature)
Permissible temperature range at the
instrument
T6 -20 ... +60 °C
T5 ... T1 -20 ... +70 °C
Dust hazardous area
Maximum surface temperature Permissible temperature range at the
instrument
T135°C -20 ... +60 °C, (+70 °C optional)
T95°C (only with NS 63) -20 ... +60 °C, (+70 °C optional)
The installation should be made in such a way that the temperature range of the instrument,
also considering the eects 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 by means of temperature measurement(s) at “T-Ref” within the shown hatched
area(s).
3. Safety
Pressure gauge Dierential pressure gauge