Specifications And Temperature Limits - WIKA 4 Operating Instructions Manual

2. Safety
Special knowledge for working with instruments for hazardous areas:
The skilled personnel must have knowledge of ignition protection types, regulations and
provisions for equipment in hazardous areas.

2.4 Specifications and temperature limits

WARNING!
Non-observance of these instructions and their contents may result in the loss
of explosion protection.
WARNING!
It is imperative that the application conditions and safety requirements are
followed.
▶ Instruments must be grounded via the process connection.
Permissible ambient temperature
-20 ... +60 °C
-40 ... +60 °C (optional, only with silicone oil filling)
Permissible medium temperature
-20 ... +100 °C
-20 ... +200 °C (optional, unfilled instruments or with silicone oil filling)
-40 ... +100 °C (optional, only with silicone oil filling)
-40 ... +200 °C (optional, only with silicone oil filling)
The permissible medium temperature does not only depend on the instrument design, but
also on the ignition temperature of the surrounding gases, vapours or dusts. Both aspects
have to be taken into account.
Maximum surface temperature
The surface temperature of the instruments mainly depends on the medium temperature of
the application. The instrument itself does not contain any heat sources.
For determining the maximum surface temperature, besides the medium temperature also
other influences such as the ambient temperature and, if applicable, the solar irradiation
must be taken into account. For prevention, consider the maximum medium temperature as
maximum surface temperature, if it is not possible to determine the real surface temperature
even in the case of expected malfunctions.
Potentially explosive gas atmosphere
Required temperature class
(ignition temperature of gas
or vapour)
T6 (T > 85 °C)
T5 (T > 100 °C)
WIKA operating instructions pressure gauge, model 4 per ATEX
Maximum permissible surface temperature of the
instrument (for the end application)
unfilled or with sili-
cone oil filling
+65 °C
+80 °C
filled instruments
(except for silicone oil)
+65 °C
+80 °C
EN
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