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These barriers are used to
provide power for intrinsically safe devices in the hazardous area, the most
common device being an intrinsically safe solenoid valve. They are also used to
power I.S. Beacons,
I.S. Alarm Sounders,
LED lamps. Care
must be exercised in ensuring that the power supplied by these barriers does not
exceed the maximum safety values permissible for the field device. These values
are shown on the certificate accompanying the field device and the safety values
for the barriers are shown on the barrier certificate which can be accessed by
clicking the links below. These barriers often transfer the digital output from
a PLC or DCS system to the hazardous area for
I.S. Solenoid Valves,
I.S. Indicating
Lamps,
I.S. Sounders
or
I.S. Flashing Alarm Beacons all of which can be seen by clicking
the links.
All devices shown are certified: Ex
II (1) GD [EEx ia] IIC/IIB
SIL3
according to IEC61508 |
