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Emerson introduces control system for emergency shutdown scenarios

The new device
The new device
Emerson has released its ASCO 141 Series Advanced Redundant Control System (ARCS) to provide a solution for a variety of emergency shutdown valve applications in the chemical, power, oil and gas industries.
It includes various redundant solenoid configurations to enhance the reliability of the process and meet specific safety or reliability requirements in automation processes.
The single inlet/single outlet design provides a streamlined installation process compared to traditional bypass systems, while almost eliminating potential failure points.
The ASCO 141 series ARCS is designed for use as a component in safety instrumented systems.
Utilising 1oo2, 2oo2 or 2oo3 voting solenoids to enhance the reliability of the circuit, it functions as a redundant pneumatics tripping device to control the pilot air signal to a process valve actuator.
The ARCS features either two or four electrically actuated solenoid valves, visual indicators and a manually controlled bypass or isolation valve.
The unique control functionality allows for maintenance of the solenoid valves without having to shut down the process valve. In fact, the use of the maintenance bypass or isolation valve is not required for functional testing of the ARCS unit — a downtime-reducing feature not possible with common bypass functions.
“By addressing the concerns common with typical bypass systems — particularly those in critical or emergency shutdown applications — our ASCO 141 series ARCS provides a reliable, time-saving alternative,” said vice president of global marketing for Emerson’s industrial automation business Erik VanLaningham. “Although the use of a common bypass is a typical solution, the end-user doesn’t know if they’ll be able to shut down on demand in the event of an emergency because their redundant system is in bypass mode. This is where our unique ARCS value proposition comes in. The ARCS individual valve isolation option provides increased safety and operational availability during online maintenance to help customers achieve their required SIL rating.”

The new device