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Goal: To understand when a barrier is required and when it is not required.
Situation:
We have a flow transmitter (4-20mA) that is rated EEx ia IIC T6 going to a a PLC input module that is rated Class I Div II (B,C,D). The PLC is also rated ATEX Zone 2 Group IIB T4. Both the transmitter and the PLC are in the same area classification and are 20ft away from each other. All associated PLC equipment (power supplies, etc) are rated Class I div II. There is no change in area classification between the PLC and the transmitter.
Is an IS barrier required between the PLC and the flow transmitter?
References would be greatly appreciated.
Situation:
We have a flow transmitter (4-20mA) that is rated EEx ia IIC T6 going to a a PLC input module that is rated Class I Div II (B,C,D). The PLC is also rated ATEX Zone 2 Group IIB T4. Both the transmitter and the PLC are in the same area classification and are 20ft away from each other. All associated PLC equipment (power supplies, etc) are rated Class I div II. There is no change in area classification between the PLC and the transmitter.
Is an IS barrier required between the PLC and the flow transmitter?
References would be greatly appreciated.