WIKA 851.02.100 - Manual (Page 6)

6 WIKA Operating instructions DELTA-plus, DELTA-comb and DELTA-switch per ATEX
11242370 06/2007 GB/D/F
GB
Operating temperature for all Models
Ambient (for use in potentially explosive atmospheres): -10 ... +60 °C
Medium: The permissible medium temperature does not only depend on
the instrument design, but also on the ignition temperature of the
surrounding explosive atmosphere. Both aspects have to be
taken into account.
For permissible maximum medium temperatures see table
Attention! With gaseous substances the temperature may increase as a result
of the compression temperature. In such cases, either the rate of change of the
pressure must be slowed down or the permissible medium temperature must be
reduced.
Permissible medium temperature
Temperature class of Permissible maximum medium
the ambient atmosphere temperature (in the pressure system)
(ignition temperature)
T 6 ( > 85 °C) +70 °C
T 5 ( > 100 °C) +85 °C
all other temperature classes +90 °C
5. Installation instructions
Installation of the differential pressure gauge should follow the installation
recommendations for pressure gauges according to EN 837-2 /7.
T The maximum permissible medium / ambient temperature must not be
exceeded
T Prior to the installation of the pressure gauge, the pipes should be thoroughly
cleaned by tapping, blowing or rinsing
T The pressure gauges must be protected against contamination and high
temperature fluctuations!
T The pressure gauges should be installed and operated so as to avoid
exposure to vibration (see also section 3: Permissible vibration levels at the
mounting point).
4. Requirements for use ... / 5. Installation instructions