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What is dry contact and wet contact?

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تاريخ النشر: 2013/07/23
Mohamed Elnakib
من قبل Mohamed Elnakib , Instrumentation and control systems engineer -Al shabab power project Phase II , Pgesco

dry contacts are powerless (voltage free) contacts , wet contacts (non-dry contacts) on the other hand should include voltage .
dry contacts are mainly used to close the loop in order for an action to occur , for example a limit switch dry contacts close , closing the loop which gives the indication to the DCS that the limit switch has closed .

Mohamad Yahya Mahmoud Zaid
من قبل Mohamad Yahya Mahmoud Zaid , Instrumentation and Control Consulting Engineer مهندس استشاري أجهزة دقيقة و تحكم آلي , Petroleum Pipelines Company (PPC) شركة أنابيب البترول

there are two answers for that question
1- it's according the contacted device , if it is passive (no power supply) so it need a wet contact, if it have it's own power supply so it just need a dry contact, in other words ,,, dry contact is a relay output without providing any volt.
and wet contact is including a volt.2-dry contact is the carbon contacts, wet contacts is a mercury contacts.

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