# What is signal isolator and what are the applications of signal isolation?

**URL:** <https://forumautomation.com/t/what-is-signal-isolator-and-what-are-the-applications-of-signal-isolation/1574>\
**Category:** Industrial Automation\
**Created:** [December 17, 2016, 5:14pm UTC](https://forumautomation.com/t/what-is-signal-isolator-and-what-are-the-applications-of-signal-isolation/1574 "2016-12-17T17:14:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![denizen](https://forumautomation.com/letter_avatar_proxy/v4/letter/d/848f3c/32.png) [@denizen](https://forumautomation.com/u/denizen)\
**Post date:** [December 17, 2016, 5:14pm UTC](https://forumautomation.com/t/what-is-signal-isolator-and-what-are-the-applications-of-signal-isolation/1574/1 "2016-12-17T17:14:17Z")

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Signal Isolation - It eliminates all forms of operating disturbances.

It protects your PLC / DCS input and output cards.

Applications of signal isolation are

1.Signal adaption and scaling of process value. 2.Noise filtration. 3. Electrostatic filtration. 4.Elimination of ground loops 5.Protect against EMC 6.Eliminates crosstalk

 ![Signal Isolator](https://cdn.forumautomation.com/original/1X/82f4b060b72ca62101d92cc73d0e0af17e180364.JPG)

A signal isolator in the process loop blocks ground current to restore signal accuracy and reliability.

Isolators are available in two and four wire version.Four wire type requires a separate power source.

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**Author:** ![Vishalgovekar99](https://forumautomation.com/user_avatar/forumautomation.com/vishalgovekar99/32/2314_2.png) [@Vishalgovekar99](https://forumautomation.com/u/Vishalgovekar99)\
**Post date:** [September 4, 2018, 6:09pm UTC](https://forumautomation.com/t/what-is-signal-isolator-and-what-are-the-applications-of-signal-isolation/1574/2 "2018-09-04T18:09:32Z")

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Work as multiplexer 1 I/p many o/p