Endress+Hauser have launched the RN221N combined active barrier and power supply. The SIL2 rated barrier provides galvanic isolation for the 4...20mA measured signal, is suitable for use in hazardous areas, and can be powered by 20...250V ac/dc, reducing the need for different versions across the plant.
The RN221N’s use of front-mounted HART communication sockets makes it simple to obtain information or reprogram the instrument without removing it or disconnecting the wires.
Using a conveniently positioned DIP switch, HART diagnosis can be selected. This option provides these possibilities – monitoring the 4...20mA signal for compliance with NAMUR NE43, evaluation of the HART status byte to alarm when the connected device is in error mode, and checking the E+H – specific diagnostic command for early warning of changed process conditions with E+H devices. Featuring a 22.5 mm (Preline) width and compact DIN rail mount, the device has a small form factor making installation simple.
In many process plants, the potential for fire or explosion exists because of gases, dust, or easily ignitable fibres or filings in the vessel or area that is being monitored. The RN221N is offered with an IEC Ex ia rating which indicates that its electrical energy is restricted to a level below that which can cause ignition by either sparking or heating effects, making it ideal for use in hazardous areas.
With its inherent safety features and compact form factor, Endress+Hauser’s RN221N is a core component of an intrinsically safe solution for process plants.