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| In many aspects, safety engineered pressure
limiters offer a higher degree of safety compared
with normal pressure switches and are therefore
especially suitable for chemical process
engineering and thermal installations in which
safety is an especially critical factor in pressure
monitoring. Pressure switches can also be used
in Ex- zones (zone 0, 1, 2 and 20, 21, 22) and,
in all cases, require an isolating amplifier.
The isolating amplifier is also responsible for
monitoring lines for short circuit and line
break and therefore offers an additional safety
advantage even in non Ex-zones. For
Ex-applications, the isolating amplifier must be
installed outside the Ex-zone. The lines between
the isolating amplifier and the pressure switch
are monitored for short circuit and line break.
Explosion protection code: Ex II 1/2G Ex ia IIC T6 Ga/Gb, Ex II 1/2D Ex ia IIIC T80 oC |
| Intrinsically Safety: The equipment employed in explosion relevant areas are components of inherently safe electrical circuits. An electrical circuit is inherently
safe if the amount of energy it contains is so small that no spark or other thermal effect can arise. This reliably prevents the ignition of explosive gas mixtures in the proximity of this equipment. In the context of this directive, pressure switches and thermostats containing
no switching components with energy storage effects are referred to as "simple electrical equipment." |
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