Pepperl+Fuchs Blog

David Hohenstein

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Because Sometimes You Need More Than an Intrinsic Safety Barrier

Posted by David Hohenstein on Thu, Sep 03, 2015

There are times when you need only an intrinsic safety barrier or surge protection to get the job done. But what if you need more than just a component, something more customized, something like a complete system solution—including documentation and certification? Sure, you could always build your own and have it certified yourself. But it's time consuming, and the number of approval standards and certification bodies is enormous. You really need to be focusing on keeping your plant running.

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Topics: Approvals/ Certifications, Hazardous Area Enclosures/ Equipment, Intrinsic Safety Barriers

IS Barriers - Keepin' it Safe in Hazardous Areas

Posted by David Hohenstein on Fri, Oct 19, 2012

An IS barrier (also called an intrinsic safety barrier) is, quite simply, an electronic safety device that is used to protect a circuit or instrument located in a hazardous location from becoming an ignition source.

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Topics: Intrinsic Safety Barriers, Intrinsic Safety

What is a Fieldbus Junction Box?

Posted by David Hohenstein on Tue, Aug 28, 2012

We assign the term fieldbus junction box to an enclosure mounted in a remote location, near the process, containing some type of electronic distribution module for use in a digital ‘fieldbus’ application.

The module mounted within the enclosure typically provides short-circuit protection, current limitation, isolation, and other electronic monitoring to the connected field instruments/sensors and to the control system.

In a digital fieldbus network like PROFIBUS PA or FOUNDATION fieldbus, it is very important to provide protection against inadvertent shorts or other faults. FF and PA fieldbus networks share a single shield twisted pair for power and communication, so a fault of this type could potentially affect the entire network if the individual instruments are not isolated. This is the main reason it is NOT recommended to daisy chain PA and FF devices.

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Topics: Hazardous Area Enclosures/ Equipment, Fieldbus

Intrinsic safety barriers and field instruments

Posted by David Hohenstein on Fri, Jun 01, 2012

Does a field instrument need to be rated IS when it’s used with an intrinsic safety barrier?

If we make the obvious assumption that the area classification in which the field instrument is mounted is rated Class I, Division 1, the answer is YES. The instrument must be intrinsically safe if it’s connected to an intrinsic safety barrier.

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Topics: Intrinsic Safety Barriers, Intrinsic Safety

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