Ex? Non-Ex? Experts in Any Case
03 May 2008
For mixed Ex i and non-Ex i signal circuits, users can now draw upon the advantages of the proven ISpac isolator system. While existing modules have served to connect intrinsically safe field devices such as temperature sensors, valves, proximity switches and transmitters to the control level, isolators are now also available for segments that are not suitable for intrinsically safe wiring. Of course, field devices which cannot be connected to intrinsically safe networks (e.g. due to high energy demand) can be connected directly to a PLC or control system.
In industrial environments, however, data transmission can be then disrupted by interference, which especially distorts analog signals. Galvanic three-way isolators such as ISpac devices counteract these influences, ensuring a safer and more precise signal communication.
The ISpac product range for non-Ex i applications covers a wide functional range, including transmitter supply units, isolating repeaters for 0/4mA to 20mA signals, loop-powered isolating repeaters for 0/4mA to 20mA signals, temperature transmitters for common sensors and limit monitors for temperature sensors, 0/4mA to 20mA signals or frequency signals. An integrated error alert function enables users to quickly isolate malfunctions that occur. Moreover, the flexible, innovative pac-Bus power supply concept allows for quick and easy installation in switching cabinets, where the units, which are only 17.6mm wide (two-channel versions), save valuable space. However, even the modules for non-intrinsically safe field devices cannot do without explosion-protection features. Like all ISpac isolators, they were tested by an independent laboratory and have been approved for zone 2 installation.
