KROHNE OPTISWITCH 3300 C Handbook page 18

5 Connecting to power supply
Housing overview
Wiring plan
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4
1
Fig. 9: Material versions, single chamber housing
1 Plastic (not with Ex d)
2 Aluminium
3 Stainless steel (not with Ex d)
4 Filter element for pressure compensation (not with Ex d)
We recommend connecting OPTISWITCH 3300 C in such a way that
the switching circuit is open when there is a level signal, line break or
failure (safe state).
The instrument is used to control relays, contactors, magnet valves,
warning lights, horns as well as PLC inputs.
Caution:
There is no reverse polarity protection. Take note of the polarity of the
output lines.
1
Fig. 10: Wiring plan
4
2
OPTISWITCH 3300 C • Transistor (NPN/PNP)
4
3