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What is the meaning of Dry contact and Wet Contact related
to to sensors?
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Answer Posted / welcome4ujd
dry contact is that the contacts are floating. One example
is the COM, NC and NO contacts of the relays. If no voltage
is connected to them, it is called dry contacts.
Volt-free and dry contact mean the same thing. If a control
system supplier offers a dry contact for you to read as a
status bit, then he is offering to close a contact (relay
or contact output) that is nothing more that a stand-alone
set of contacts with no voltage, current, or anything else
impressed across the contact set. It becomes the user's
responsibility to determine how to sense that contact
closure. Usually you do this by putting a voltage on one
side and sensing the voltage on a return line from the
other side of the contact when it closes. Once you apply
voltage to the contacts, it becomes a wet contact.
You "wet" the contact with a sensible voltage level.
.
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