Class I, Gp D Class II, Gps E,F,G Group IIA	Class I, Gp D Class II, Gps E,F,G Group IIA	Class I, Gp D Class II, Gps E,F,G Group IIA	Class I, Gps C,D Class II, Gps E,F,G Group IIB	Class I, Gps C,D Class II, Gps E,F,G Group IIB	Class I, Gps C,D Class II, Gps E,F,G Group IIB	Class I, Gps A,B,C,D Class II, Gps E,F,G Group IIC	Class I, Gps A,B,C,D Class II, Gps E,F,G Group IIC	Class I, Gps A,B,C,D Class II, Gps E,F,G Group IIC
Barrier Output (Po)	Voc (Uo)	Isc (Io)	Ca (Co)	La (Lo)	L/R Ratio	Ca (Co)	La (Lo)	L/R Ratio	Ca (Co)	La (Lo)	L/R Ratio
870 mW	9.48 VDC	367 mA	255 uF	2.1 mH	327 uH/Ω	27 uF	1.05 mH	160 uH/Ω	3.7 uF	0.26 mH	40.8 uH/Ω

This Intrinsic Safety Barrier Module is the perfect complement to our Intrinsically Safe Encoders and, when used together, constitutes a completely engineered solution for encoder operation in Class I and Class II, Division 1 (Zone 0) Hazardous Environments. This single barrier provides both power and signal isolation for an incremental encoder with differential quadrature outputs and an index. This all-in-one approach saves the cost, inconvenience and system design time needed when using separate power and signal barriers. This barrier is galvanically isolated which eliminates the added cost of maintaining a high integrity earth ground. With differential line driver outputs, this barrier can be used to carry signals reliably up to 500 feet with a bandwidth of up to 250 kHz. It is designed around a standard DIN Rail mounting (Type EN 50022, 35 mm X 7.5 mm) for easy installation in standard enclosures. A length of DIN rail is supplied with each module. The module simply snaps directly to the DIN rail and is ready to use. The Intrinsic Safety Barrier Module is also certified to be installed in Class I, Div. 2 (Zone 2) areas. When properly connected, differential data signals have an inherent immunity to noise since it is rejected as common mode. However if a connection between the encoder and the barrier is broken or improperly terminated it can act as an antenna and still create a signal. An open wire detection (ISD) option is available on BEI’s Intrinsically Safe Barriers (28V/V and 28V/5 only). In the event that the data line is cut or not properly connected the ISD option can detect a change in the impedance of the connection and cause the output data on both legs of the differential signal to go low. This creates an erroneous logic state that can be used by the operator to halt or modify a process.

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