WIKA 632.50 Serie Betriebsanleitung Seite 12

2. Safety
Hazardous dust atmosphere
For dusts, the procedure specified in ISO/IEC 80079-20-2 for determin-
ing the ignition temperature has to be applied. The ignition temperature
is determined separately for dust clouds and dust layers, respectively.
EN
For dust layers, the ignition temperature depends on the dust layer thick-
ness per IEC/EN 60079-14.
Ignition tempera-
ture of dust
Dust cloud: T
cloud
Dust layer: T
layer
The permissible maximum medium temperature must not exceed the
lowest determined value, even in case of a malfunction.
Explosive atmosphere consisting of hybrid mixtures
The instruments must not be used in areas in which an atmosphere
consisting of explosive hybrid mixtures (dusts mixed with gases) can
occur.
Handling of materials
Avoid exposing the instrument to any substances or environmental
conditions that could negatively affect the instrument and the materials
used. Avoid handling substances that are liable to spontaneous combus-
tion. For a list of the materials used, see chapter 8 "Specifications". The
materials of the wetted parts are stated on the dial.
Cleaning
Clean the measuring instrument with a moist cloth. Ensure that due to
the cleaning no electrostatic charge will be generated.
Special hazards
12
Maximum permissible surface temperature
of the instrument (for the end application)
< 2/3 T
cloud
< T − 75 K − (reduction depending on the layer thickness)
layer
Operating instructions capsule pressure gauge, model 63x.50 per ATEX