WIKA NS100 Betriebsanleitung Seite 6

2. Safety
2.3 Safety instructions for pressure gauges per ATEX
EN
Permissible ambient temperature
-20 ... +60 °C
-40 ... +60 °C
Attention! With gaseous media, the temperature may increase as a result of
compression warming. In these cases it may be necessary to throttle the rate of
change of pressure or reduce the permissible medium temperature.
Permissible medium temperature
-20 ... +100 °C
-40 ... +200 °C
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 pressure gauges mainly depends on the medium
temperature of the application. For determining the maximum surface tempera-
ture, besides the medium temperature also other influences such as the ambient
temperature and, if applicable, the solar irradiation must be taken into account.
Potentially explosive gas atmosphere
Required temperature
class
(ignition temperature of
gas or vapour)
T6 (T > 85 °C)
T5 (T > 100 °C)
T4 (T > 135 °C)
T3 (T > 200 °C)
6
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 require-
ments of the EC-type examination certificate are followed.
Pressure gauges must be grounded via the process connection.
▶
(unfilled)
(silicone oil filling)
(unfilled)
(silicone oil filling)
WIKA operating instructions pressure gauge, model 4 per ATEX
Maximum permissible medium temperature
(in the measuring system)
unfilled
+65 °C
+80 °C
+100 °C
+100 °C
Silicone oil filling
+65 °C
+80 °C
+108 °C
+160 °C