8
Galvanic Isolator
The IS-SB-02-XX Intrinsically Safe Sounder Beacon Range is compatible for
use with suitably rated Galvanic Isolators. The Glavanic Isolators have the
advantage of not requiring an isolated high integrity earth to be installed to con-
nect the Zener Barriers. These Isolators are often more expensive per unit but
may reduce installation costs as the earth is not required.
The IS-SB-02-XX range can be powered by the Galvanic Isolators with match-
ing parameters as described in the entity parameters section of the installation
sheet. The combined unit can be turned on and off either by using a suitably
placed switch in the positive or negative rails (switch must be of suitable ratings
if installed in the Hazardous area), or by turning the Galvanic Isolator on and
off. For both applications the wire link described on page 6 will be required.
As with the Zener barriers, the Sounder and the Beacon can be triggered inde-
pendantly when using Galvanic Isolators, however an additional Intrinsically
Safe relay is required to make the additional connection.
As with all equipment in the system, the correct ratings must be maintained to
keep the integrity and safety to the correct levels. The relay can be switched to
change between Sounder or Beacon or Both.
