If an Entity certified* field device needs to be added to a segment powered by a FISCO power supply, then a 9321-SC Entity spur connector can be used with a 9121-IS power supply and a 9323-SC Entity spur connector can be used with a 9122-IS power supply.
When connected between the segment and the device, it limits the power and with the 9323-SC the current, making the spur compatible with the safety description (24V, 250mA and 1.2W) of an Entity certified device.
If field devices are to be mounted in Zone 0, or have an electrical connection into Zone 0, then a 9322-SC spur connector can be used. This is connected in the spur to provide EEx ia current limiting.
The 9322-SC is designed to work with the 9121-IS IIC or 9122-IS IIB FISCO power supplies. This can only convert an ‘ib’ source to an ‘ia’ when the source voltage is clamped to ‘ia’ as with the 9121-IS and 9122-IS power supplies.
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* FF816 IS Entity physical layer profile