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Galvanic Isolator
The IS-S-02 Intrinsically Safe Sounder Range is compatible for use with suit-
ably rated Galvanic Isolators. The Glavanic Isolators have the advantage of not
requiring an Isolated high integrity earth to be installed to connect the Zener
Barriers. These Isolators are often more expensive per unit but may reduce
installation costs as the earth is not required.
The IS-S-02 range can be powered by the Galvanic Isolators with matching pa-
rameters as described in the entity parameters section of the installation sheet.
The Sounder 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.
As with the Zener barriers, the second stage alarm can be triggered 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 stage 1 and stage 2.
