Emerson has released its ASCO™ 141 Series Advanced Redundant Control System (ARCS) to provide a redundant solution for a variety of emergency shutdown valve applications, such as those found in the chemical, power, oil, and gas industries. Available globally, 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. Utilizing 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. 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.
With just a single part number, the ASCO 141 series ARCS features several advances that simplify specification, installation, and operation. Supplied as a fully integrated, comprehensive solution using a manifold instead of individual valves, ARCS comes pre-tested from the factory and ready to install. The direct valve-to-valve design eliminates pipework and fittings between the solenoid valves and minimizes leak points for increased reliability and a lower total cost of ownership.