Page 14 - Pipelines

Protection of field instruments

The surge immunity of field devices such as pressure or The following protection goals can be achieved with the
temperature transmitters complies with the common requi- DEHN protection solutions:
rements of the EMC standards, but is not sufficient for most • Protection of devices and components in case of transient
overvoltages caused e.g. by lightning strikes. The transmitters
are often destroyed and dangerous sparking could lead to overvoltage
significant danger and damage in a potentially explosi- • Explosion protection
ve atmosphere. The function of surge protective devices
from DEHN is to repeatedly discharge overvoltage without
sparking and to simultaneously protect the electronics of the
transmitter.

The Yellow/Line series from DEHN includes a comprehensive
product portfolio for protecting measuring and control sys-
tems, for example arresters for analogue 4 … 20 mA signals,
field bus systems or intrinsically safe systems in potentially
explosive atmospheres.

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