Yokogawa Electric Corporation announces the development and the late January 2021 release of ProSafe-RS Lite, a safety integrity level 2(SIL2*1) version of the ProSafeTM series safety instrumented system. ProSafe is a core product of the OpreXTM Control and Safety System family.
With the addition of ProSafe-RS Lite, Yokogawa’s portfolio of safety instrumented systems will cover all risk reduction levels from SIL2 to SIL4, allowingcustomers a greater range of choices in their selection of a safety instrumented system that meets installation cost and site SIL requirements. Yokogawa will continue working to make plants safer with ongoing enhancements to ProSafe series functionality.
Development Background
When an abnormal condition is detected in a plant operation, a safety instrumented system can automatically put a process into a predetermined safe state by initiating a control action such asan emergency shutdown. Safety instrumented systems are considered to be the last line of defense in protecting the safety of plant operators, plant facilities, and the environment.
Yokogawa’s ProSafe seriesof safety instrumented systems consists of two types: The solid-state ProSafe-SLS, which has a magnetic core and meets requirements up to SIL4, and the programmable ProSafe-RS, which meets requirements up to SIL3 (the highest level possible withthis type). ProSafe series systems are typically deployed as emergency shutdown systems for major plant facilities.However, safety instrumented systems are also needed for utilitiessuch as fire preventionand extinguishing systems, and boilers that do not require the highest safety integrity levels (SIL 3 and 4).To meet the need for SIL2-capable safety instrumented systems, Yokogawa has developed ProSafe-RS Lite. By expanding its safety instrumented system portfolio, Yokogawa gives its customers a wider range of choices in selecting the system that best meets their installation cost and site SIL requirements.
Features
A ProSafe-RS Lite system can be configured from controllers, an extensive variety of I/O modules, communication modules, and peripheral devices.
- SIL2 with a single module configuration
Unlike the many safety instrumented systems on the market that meet the SIL2 requirement by multiplexing modules, ProSafe-RS Lite accomplishes this with a single module configuration. In addition to reducing engineering and other installationcosts, this holds down the cost of operating and maintaining the system.
Furthermore, the use ofadual-redundant module configuration ensures that the system can maintain SIL2 level performance and remain operational even if a module fails.
- Integration with control systems
ProSafe-RS Lite can be integrated withthe CENTUM VP integrated production control system and the ProSafe-RS system, allowing operatorsat CENTUM VP human machine interface (HMI) stationsto monitor in a unified manner the safety instrumented systems that control emergency shutdowns systems, fire prevention and extinguishing systems,boilers, and other facilities. One benefit of this is that operators have immediate access to all the alarms generated by safety instrumented systems, ensuring a prompt response in the event of an emergency.
- Ease of adding an SIL2 system to existing systems
ProSafe-RS Lite supports the same control bus (Vnet/IP*2) as CENTUM VP and ProSafe-RS. It is therefore easy to add ProSafe-RS Lite to systems that have been built using Vnet/IP. Furthermore, the ProSafe-RS safety engineering tool can be used with ProSafe-RS Lite, which eliminates the need to install and learn new tools.
Major Target Markets
Oil and gas, petrochemicals, chemicals, electric power, pulp and paper, pharmaceuticals, food, iron and steel, water supply and wastewater treatment, non-ferrous metals, metal, cement, etc.
Applications
For use in fire and gas systems, emergency shutdown systems,and burner management systems
*1 Established by the International Electrotechnical Commission (IEC), a safety integrity level (SIL) indicates the relative level of risk provided by a safety function. SILs 1 through 4 are defined by IEC 61508. Compared to a plant where safety measures are not in place, at SIL2 the risk factor is reduced to between 1/100 and 1/1,000. At SIL3, the risk factor is in a range between 1/1,000 and 1/10,000. At SIL4, the risk factor is in a range between 1/10,000 and 1/100,000.
*2 A control network developed by Yokogawa that features high reliability and quick response. Vnet/IP complies with the IEC61784-2 international standard.
