WIKA 532.54 - Manual (Page 6)

GB
6
11554810.02 11/2013 GB/D/F/E
WIKA operating instructions pressure gauge model 5 per ATEX
Skilled personnel
Skilled personnel are understood to be personnel who, based on their technical
training, knowledge of measurement and control technology and on their
experience and knowledge of country-specific regulations, current standards
and directives, are capable of carrying out the work described and independently
recognising potential hazards.
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
requirements of the EC-type examination certificate are followed.
Pressure gauges must be grounded via the process connection!
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)
Specifications
Permissible 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
surrounding 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.