Endress+Hauser have an active barrier with power supply for safe separation of 4…20 mA current circuits. The RN221N Active barrier supplies e.g. a transmitter with power, if required also in the Ex-area and then transmits the galvanically isolated signal.
With the optionally available HART monitoring, the status of the transmitter is monitored. If an error arises, a relay at the RN221N sends an alarm. The relay has to be actively set back, therefore even just briefly occurring errors can be easily located.
The benefits of the RN221N Active barrier are …
Wide range power supply, flexible power source
Compact side by side DIN rail housing
International Ex approvals, Germanischer Lloyd / marine approval
Bidirectional HART® transmission. Communication sockets for HART® sensor setting up. Evaluation of status information from connected transmitter with HART® protocol.
Primary or secondary master operating mode, automatic selection
Sensor monitoring with early-warning system
Manual or automatic reset of the relay contact
The unit creates a safe galvanic isolation between input and output of the circuits. Separation between the hazardous and non-hazardous areas is available as an option. A built-in loop power supply can supply connected sensors with the necessary energy. A current signal is available at the output for connection to further instrumentation.
In many 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 Active barrier and power supply is offered with an IEC Ex ia rating, which indicates that its electrical energy is restricted to a level below that can cause ignition by either sparking or heating effects, making it suitable for use in hazardous areas.
With its inherent safety features and compact form factor, the RN221N Active barrier is a core component of an intrinsically safe solution for a process plant; if you’re interested in finding out more please get in touch on 01244 288138 or email@example.com.