WIKA 632.51 - Manual (Page 6)

6
2089436.03 12/2010 GB/D/F/E
GB
WIKA operating instructions pressure gauge model 6 per ATEX
2.3 Safety instructions for pressure gauges per ATEX
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 earthed via the process connection!
Technical data
Operating temperature
Ambient: -20 ... +60 °C (optional: -40 … +60 °C)
Medium: The permissible medium temperature does not only depend on the
instrument design, but also on the ignition temperature of the surroun-
ding gases, vapours or dust. Both aspects have to be taken into account.
For permissible maximum medium temperatures see table 1.
Attention! With gaseous substances, the temperature may increase as a result
of compression warming. In such cases the rate of change of pressure must be
slowed down or the permissible medium temperature must be reduced.
Table 1: Permissible medium temperature
2. Safety
Temperature class of the
ambient atmosphere
(ignition temperature)
Maximum permissible medium temperature
(in the measuring system)
T 6 (> 85 °C) +70 °C
T 5 (> 100 °C) +80 °C
T 4 (> 135 °C) +80 °C
T 3 (> 200 °C) +80 °C
T 2 (> 300 °C) +80 °C
T 1 (> 450 °C) +80 °C