Questions about TURCK proximity switches
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TURCK position switch, model 1 – how many two-core wires are needed for wiring it? 2. Is it set to the current-mode type in the diagram? If so, how should a safety barrier be connected to it? How many pieces are needed for one valve?
As can be seen from the diagram, there are two proximity switches involved, so two two-core instrument wires are required. The supply voltage is 8.2VDC; it is of the intrinsically safe type. Two signals – open and closed – require two safety barriers
Looking at the wiring diagram, the meter head has 8 terminals. 1234 is easy to understand, but the diagram for 5678 is confusing
Two two-core wires are required; it’s an intrinsically safe NAMUR-type proximity switch, and a safety barrier is definitely necessary. I’m not very familiar with the specifics of safety barriers.
“\"TURCK\" – is it a Nazi dog? What kind of crappy diagram is this? . . For intrinsically safe meters, aren’t there any intrinsically safe wiring connections? For any intrinsically safe gauge that is not of the two-wire type, a safety barrier must be installed at its output terminal! The power supply side must use an intrinsically safe power source; generally, it does not support power supply from safety barriers. . . Nazi dogs, those dogs really do look evil, with split tails too – is the power supply 8.2V? Those damned dogs really know how to bite and dig at eggs.
Intrinsic safety type proximity switches are not reliable; our company mainly uses flameproof contact-type switches
5678 is just an intermediate terminal block
Are they all SIL2-rated devices? Is redundancy required? If that’s the case, then it’s correct – as long as there is a signal in any one of the circuits. It seems to be independent dual-channel devices
It should be an intrinsically safe, redundant dual-channel device; one isolation barrier is used for dual channels, and two for single channels.