WIKA 432.36 - Manual (Page 6)

6
2080276.04 12/2010 GB/D/F/E
GB
WIKA operating instructions pressure gauge model 4 per ATEX
Temperature class of the ambient
explosive atmosphere
(ignition temperature)
Maximum permissible medium
temperature (in the measuring
system)
T 6 (85 °C < T ≤ 100 °C) +70 °C
T 5 (100 °C < T ≤ 135 °C) +85 °C
T 4 (135 °C < T ≤ 200 °C) +100 °C or +120 °C 1)
T 3 (200 °C < T ≤ 300 °C) +100 °C or +185 °C 1)
T 2 (300 °C < T ≤ 450 °C) +100 °C or +200 °C 1)
T 1 (T > 450 °C) +100 °C or +200 °C 1)
2. Safety
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!
Specifications
Operating temperatures
Ambient: -20 … +60 °C
with option silicone oil filling: -40 ... +60 °C
Medium: The permissible medium temperature does not only depend on the
instrument design, but also on the ignition temperature of the surround-
ing 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 these cases it may be necessary to throttle the rate
of change
of pressure or reduce the permissible medium temperature.
Table 1: Permissible medium temperature
1) The higher values apply only to special versions with higher permissible medium temperatures.