WIKA 532.53+8xx - Manual (Page 6)

6 WIKA Operating instructions pressure gauges Model 5 with 831 per ATEX
2133086 08/2004 GB/D/F
GB
Operating Temperature
Ambient: -20 ... +60 °C
Attention: Footnote 1) under table 1 must be absolutely taken into account!
Medium: see table 1
Attention! With gaseous substances the temperature may increase as a result
of the compression temperature. In such cases the pressure change rate has to
be slowed down resp. the permissible medium temperature has to be reduced.
Table 1: Permissible medium temperature (only mechanical part)
3. Technical data and use in accordance with intended use
Ignition temperature of Permissible maximum medium temperature
the ambient atmosphere (in the pressure system)
(temperature class)
> 85 °C (T 6) +70 °C
> 100 °C (T 5) +85 °C
> 135 °C (T 4) +100 or +120 °C 2)
> 200 °C (T 3) +100 or +185 °C 2)
> 300 °C (T 2) +100 or +200 °C 2)
> 450 °C (T 1) +100 or +200 °C 2)
1) The permissible uppper ambient temperature for the electrical components is determined by the
electrical connection values and the ignition temperature of the ambient gases, vapours and dusts.
Therefore the maximum permissible ambient temperatures specified in the EC-type examination
certificates for slot-type sensors and SN sensors must be observed as well. The lower of these two
values is to be considered the maximum permissible ambient temperature!
2) The higher values apply only to special versions with higher permissible media temperatures.
Installation
T In order to ensure that with both models 53X.31 ... 34 pressure can be
safely and reliably vented through the case back, a distance of at least
25 mm has to remain free behind the case!
T In order to avoid any additional heating, the instruments must not be
exposed to direct solar irradiation while in operation!
T With filled versions the ventilating valve at the top of the case must be
opened prior to commissioning!