The signalling product manufacturer E2S has published a guide for specification and installation for their range of sounders, beacons and combination devices. The guide is based on the ATEX certification but in general, the guidelines apply to other intrinsic safety standards including NEC and IECEx.
Focusing on interface selection, the guide offers advice regarding the advantages and disadvantages of Zener barriers and isolation interfaces and provides the general entity parameters for E2S’s products. Typical system diagrams detail how efficiently to employ types of Zener barriers or isolators to control combination audio-visual signals and multiple alarm stages.
Also proposed are suitable barriers for use with E2S products which the company can source and supply as part of a product order. The range includes audible and visual signals and manual call points suitable for use in Group II Zone 0 and Group I mining plus Class I Division 1 applications. The IS range features approval to ATEX, IECEx and NEC standards as well as Russian TR CU (EAC EX) certification.
The guide can be downloaded from www.e2s.com/isguide.
