These are typical system diagrams using Isolation interfaces for E2S Intrinsically safe sounders and beacons.
The following .circuits are for are for illustration only, installation and details may be omitted for clarity.
Please refer to the relevant certification prior to use.  As all E2S sounder and beacons have the same entity parameters in most circuits different E2S intrinsically safe field apparatus may be used providing it has the relevant input feature.   Where examples show the IS-mini range a direct replacement can be made using the IS-A105N and IS-L101L or combination. Please contact E2S for further information.
 

The simplest installation is with a Single stage alarm with a single channel isolation interface (Power driver).
This is suitable for all E2S Intrinsically safe sounders and beacons.

When using isolation interfaces the integrity of the isolation must be maintained so an intrinsically safe relay is used to switch the second stage alarm.

Although the relay contacts can be treated as simple apparatus, the relay must be certified. (see list below of suggested relays)

Similarly add another relay (or a double relay module) for the 3rd stage audible alarm

The sounder and beacon IS-MC1 or the combination of IS-105N and IS-L101 can be powered with a single channel interface

For independent control use a double channel, or 2 separate isolation interfaces

Again adding a relay gives 2nd level alarm option

The combined IS-A105N / IS-L101L has a mute option, adding a switch will mute the alarm
Depending on the DIP switch settings on the IS-L101 reset occurs:
On alarm condition being removed i.e. power down of IS-L101L or
after a dip switch selectable interval – from 5 seconds to 2 hours.
Note the reset switch does not need to be certified as it is considered to be simple apparatus.

Single Power

Dual channel power

Relay

Dual Ch relay

Pepperl + Fuchs

KFD0-SD2-Ex1.1045

KFD0-SD2-Ex2.1045

KFD0-RO-Ex2

MTL /RTK Eng

5025

DAA149