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Figure 9.3.12 Combined arrester modules with LifeCheck Figure 9.3.13 DEHNpipe surge arrester for outdoor use is screwed
onto two-conductor field devices
are chosen according to the maximum continuous operating It is recommended to install a DEHNpipe surge arrester to pro-
voltage, the nominal current, the type of signal (DC, LF, HF) and tect two-wire field devices such as pressure or level sensors,
the type of signal transmission (balanced, unbalanced). valves, pressure transmitters or flow meters (Figure 9.3.13).
Figure 9.3.11 shows examples of surge protective devices for This arrester ensures energy-coordinated surge protection for
signal and control lines. outdoor field devices and takes up little space.
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