13
11041781.04 01/2020 EN/DE
Pressure gauge with reed contact model 851-A, for Ex areas
EN
Permissible temperature range
For determining the maximum temperature at the instrument,
besides the medium temperature also other influences such as
the ambient temperature and, if applicable, the solar irradiation
must be taken into account.
Gas hazardous areas
Required temperature class
(ignition temperature)
Permissible temperature
range at the instrument
T6 ... T1 -20 ... +70 °C
Dust hazardous areas
Maximum surface
temperature
Permissible temperature
range at the instrument
T85°C -20 ... +70 °C
The installation should be made in such a way that the temper-
ature 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.
3. Safety
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