Are there any additional requirements (requirements over and above standard practice) that I should put into practice when employing zener barriers and / or repeaters (remote amplifiers) with E-Stop switches in hazardous areas?

Thank you for your assistance.
Rocky

 

If the hazardous area classification is EX"i" and you are using barriers/isolator amplifiers then you dont need anything extra.

You could go for an EX"d" enclosure for the E/Stop for backup,but it is very expensive though.

Regards
Rheinhardt Peens

 

Just curious how you plan to implement hard wired circuits through IS barriers to a safety relay? Are there safety relays so rated?

Bob Peterson

 

If you have a SIL (Safety Integrity Level) requirement for the safety loop where the you are going to install the E/stop button, then you have
to include the probability of failure dangerously of any device added to the loop, and verify that the required SIL is achieved.

Regards,

Juan Calderon
MCL Control S.A.
www.mclcontrol.com
Ph. +58(212)238.2996 Ext. 119
Fax. +58(212)232.1223