WIKA NS160 Betriebsanleitung Seite 8

2. Safety
Required temperature class
(ignition temperature of gas
or vapour)
T4 (T > 135 °C)
T3 (T > 200 °C)
EN
T2 (T > 300 °C)
T1 (T > 450 °C)
Explosive dust atmosphere
For dusts, the procedure specified in ISO/IEC 80079-20-2 for determining the ignition
temperature has to be applied. The ignition temperature is determined separately for dust
clouds and dust layers, respectively. For dust layers, the ignition temperature depends on the
dust layer thickness per IEC/EN 60079-14.
Ignition temperature of
dust
Dust cloud: T
cloud
Dust layer: T
layer
The medium temperature must not exceed the lowest determined value for the maximum
permissible surface temperature, 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.
2.5 Special hazards
WARNING!
For hazardous media such as oxygen, acetylene, flammable or toxic gases or
liquids, and refrigeration plants, compressors, etc., in addition to all stand-
ard regulations, the appropriate existing codes or regulations must also be
followed.
Instruments with PTFE lining
WARNING!
Media which can become electrostatically charged are not permissible for
instruments with PTFE lining.
▶
For additional important safety instructions see chapter "2.4 Specifications and temperature
limits".
8
Maximum permissible surface temperature of the
instrument (for the end application)
unfilled or with sili-
cone oil filling
+105 °C
+160 °C
+200 °C
+200 °C
Maximum permissible surface temperature of the instru-
ment (for the end application)
< 2/3 T
cloud
< T − 75 K − (reduction depending on the layer thickness)
layer
Select media that do not generate any electrostatic charge.
WIKA operating instructions pressure gauge, model 4 per ATEX
filled instruments
(except for silicone oil)
+100 °C
+100 °C
+100 °C
+100 °C