R. Stahl’s proven remote I/O system IS1 for hazardous areas provides a cost-efficient solution for conventional and Hart field bus devices. A new addition to the IS1 product range is the ISbus system, which contains devices and accessories for Foundation Fieldbus H1 and Profibus PA.
To allow for the operation of a maximum number of field bus devices, the ISbus system was deliberately designed as a non-intrinsically safe solution. The Ex e/Ex i field device coupler allows for the operation of intrinsically safe field devices according to Fisco on a non-intrinsically safe field bus. The intrinsically safe circuits feature a short circuit protection and are galvanically isolated from the non-intrinsically safe bus. The Ex e/Ex e field device coupler also allows for the connection of non-intrinsically safe field devices. All couplers are approved for operation in zones 1 and 2. Stahl provides special ISbus power supply units for the non-intrinsically safe field bus. The supply is galvanically isolated from the field bus and is monitored for undervoltage. The field bus power supply units are installed in zone 2 or in safe areas.
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