Safety Instrumented System (SIS)

The Best and Most Dependable Partner for Safety Excellence

Industrial processes and plants increasingly experience concern about potential incidents that can affect people, assets and the environment in and outside the plant. A safety instrumented system (SIS) can dramatically reduce the risk of accidents in your plant.

Yokogawa has over 50 years of experience in the development and implementation of safety systems and is the world's most trusted automation solutions partner for efficient project execution and safety system solutions.

Contact us today and become one of many to discover how the benefits of a compliant safety system surpasses its cost.

Safety Applications

Yokogawa’s ProSafe systems offer superior solutions for a range of applications in oil and gas, petrochemical and chemical, and conventional and nuclear power industries.

Emergency Shutdown (ESD) System

Certified to comply with the IEC 61508 international functional safety standards and fully integrated with a distributed control system (DCS), our ProSafe solutions improve plant safety by assuring a plant is securely shut down when critical conditions occur.

Burner Management System (BMS)

Yokogawa’s ProSafe-RS can be employed as the BMS burner shut-off system for incinerators, furnaces, and boilers, including a safety shut-off mechanism to prevent explosion and ensure plant safety.

Fire and Gas (F&G) System

Integrating a fire and gas safety system ensures the safety of personnel and plant equipment by detecting unsafe conditions before causing potentially serious harm.


High-integrity Pressure Protection System (HIPPS)

Used in subsea and onshore pipeline protection systems as well as chemical process plants, our safety instrumented systems offer reliable solutions for high integrity safety requirements.

Our Safety System Solutions

  • The ProSafe-RS is a Safety Instrumented System that is certified by the German certification organization (TÜV) to meet Safety Integrity Level (SIL) 3 specified in IEC 61508. It has been used in over 2,400 projects, ranging from large scale integrated process automation projects to stand-alone solutions.

  • ProSafe-SLS is a Solid-state controller providing inherently failsafe performance and 10ms response. It is solution for high integrity safety requirements and used in subsea as well as onshore pipeline protection systems. It is proven to be the most reliable solution for rugged environments.

  • Sustainable SIS is a software based solution for optimizing and improving process safety integrated with ProSafe-RS and ProSafe-SLS. It maintains evergreen safety performance with optimum OPEX (Operating Expense) throughout the whole safety lifecycle.

Safety Consultancy Service

Yokogawa is committed to supplying industrial safety systems that meet the IEC 61508 and IEC 61511 standards. Safety management plays an increasingly crucial role in many process plants today, and widely recognized safety standards such as IEC 61508, IEC 61511 and ISA 84.00.01 have been instrumental in fostering more stringent safety requirements in process plants worldwide.
At Yokogawa a department of specialists guarantees adherence to safety standards and issues Safety Assessment Certificates for individual applications.
For more information, please go to the Yokogawa Europe website.

Trainings of the TÜV Rheinland Functional Safety Program

Yokogawa has become a course provider for the TÜV Rheinland Functional Safety Program of TÜV Rheinland Industrie Service GmbH.
For more information, please visit "Trainings of the TÜV Rheinland Functional Safety Program."

  • Modern waste to energy facility in UK uses CENTUM CS 3000 and ProSafe-RS
  • Lakeside exports at least 34MW per hour to the country's national grid
  • Completion of First FPSO Project for Prosafe Production Services Pte Ltd
  • Integrated Control & Safety System (ICSS) makes possible centralised plant supervision and management of all control and safety functions on this FPSO.
  • Operational Excellence by Asset Maximization, Utilizing Yokogawa's DCS, SIS, Analyzers, and Field Instruments.
  • The CENTUM VP PCS and ProSafe-RS SIS were integrated using the same engineering environment.
  • Nearly 60 gas chromatographs and a large number of other types of analyzers in several analyzer houses.
  • Online hot cut over from the legacy Honeywell TDC3000 to the Yokogawa CENTUM CS 3000.
  • The work was successfully completed 48 days ahead of schedule and without disruption to operations.

Nederlandse Aardolie Maatschappij (NAM) is the Netherlands' largest natural gas producer. In addition to onshore fields, NAM operates manned platforms and four unmanned monotowers in 19 offshore locations. These connect to a pipeline network that comes ashore at Den Helder. 

  • Integrated CENTUM VP and ProSafe-RS Systems Ensure Nonstop Operation of ADU/DKU Processes.
  • "This is a real VigilantPlant! We will continue to improve our production efficiency."
  • HMEL selected an integrated solution from Yokogawa
  • Yokogawa India oversaw and implemented the engineering, installation, and commissioning of the refinery
  • Legacy ProSafe-PLC SIS replaced with ProSafe-RS to improve sustainable lifecycle support at LNG terminal.
  • The seamless use of the same HMI for both PCS and SIS, and improved safety and integrity.
  • Reinstrumentation project at HDPE plant replaced legacy pneumatic instruments and PLCs with integrated CENTUM CS 3000 PCS and ProSafe-RS SIS.
  • HART field devices can be monitored from the central control room with the plant resource manager (PRM) package, enabling a more predictive and proactive maintenance approach that reduces total cost of ownership.
  • Extremely cost-effective, reliable fieldbus solution to revive control system
  • Minimized total cost of ownership and maximized total value of ownership

Yokogawa CENTUM VP and SIS were selected for the Evonik Oxeno's BTX facility expansion project.
CENTUM provides the operational transparency, and more efficient diagnosis of compressors which are the heart of the facility.

  • Yokogawa joined forces with Air Liquide to co-innovate the step-by-step revamping plan based on Air Liquide's specific requirements.
  • Customer was satisfied that Yokogawa was able to deliver its solutions on time and on budget.

In maintaining and managing industrial plants, monitoring waste water pH/ORP is both a legal obligation and an unavoidable necessity for protecting the environment. Monitoring without an attentive eye can lead to severe consequences.


Recently, several ARC Advisory Group analysts and management team members had a chance to sit down with the new Yokogawa President and COO, Mr. Takashi Nishijima, and several other top Yokogawa executives to discuss the company's burgeoning presence in the worldwide upstream and midstream oil & gas industry.


Yokogawa has come a long way in making its message clear to the world of process automation. Last year, the company embarked on a full-scale global marketing campaign to make customers aware of the company's focus on system reliability, security, dependability, and robustness. Dubbed "Vigilance", the campaign created a unified message for the company and greatly helped expand awareness of the Yokogawa brand and corporate philosophy.


Process automation end users are under more pressure than ever to do more with less. The current economic climate means that many automation capital projects are on hold. With capital budgets tighter than ever, users instead focus on operational budgets (where cost cutting is also a key concern), or on automation investments with a very rapid return on investment.


August 2006

Many published papers discuss the benefits of subsea HIPPS and many studies show the potential cost-benefit analysis of this technology in deepwater applications. An internet search for subsea HIPPS is informative; however, little appears that discusses the systems already delivered and operating successfully.


September 2006

Launched in February 2005, Yokogawa's ProSafe-RS safety instrumented system (SIS) quickly gained a significant share of the market. Just 18 months later, 100 units had been sold-quite a feat considering the generally conservative nature of the SIS market. So what is behind this rapid success?


April/May 2007

A Yokogawa ProSafe-RS safety instrumented system (SIS) will be the nucleus of a new fire and gas safety system at Shell's Clyde (NSW) refinery. The contract includes the control system, system engineering and installation and supervision.


In this eBook we explain how to improve fired heaters safety & efficiency by controlling combustion using TDLS technology. Download it now and learn:

  • The 4 top industry challenges related to fired heaters
  • How to efficiently and safely manage combustion
  • How TDLS technology can improve operational excellence in fired heaters
Technické reporty Yokogawa

There are already safety systems on the market that have achieved safety integrity level SIL3 of the functional safety standard, IEC61508. However, most of them have achieved SIL3 by conversion of modules into dual-redundant or triplex form.

Technické reporty Yokogawa

The recent variety of industrial and railway accidents happening right before our very eyes make us painfully aware that "safety" must be put first and foremost. "Safety first" is a concept accepted by everyone and there is no room for disagreement. However, the author feels that, in some cases, the concrete objectives of "safety first" are not actually clear, and the grasp of the hazards is insufficient.

Technické reporty Yokogawa

In recent years it has become increasingly common for plants to be provided not only with the control layer of a production control system (DCS, etc.), but also with the protection layer of a safety instrumented system (SIS) to reduce the risk of industrial accidents. The safety instrumented system is indispensable for avoiding risks to a plant failure.


Instrumentation devices and equipment serve for plants as the eyes, ears, nose, tongue, and skin, which are responsible for the five senses, and act as the central nervous system and brain do for human beings. The reliability and availability of such devices and equipment are the most important requirements of customers.


Upgrading and renewal of plant facilities, including production control systems and safety instrumented systems, are essential for maintaining safe and efficient plant operation. Even though these activities are categorized as R&R, they require investment and customers are often required to evaluate the profitability for obtaining approval.

Technické reporty Yokogawa

Environment and safety are major topics on a global scale in recent times. As symbolized by the effectuation of the Kyoto Protocol, an interest in preserving the environment is growing worldwide, and there is also a tendency to criticize more severely, occurrences of industrial accidents that are accompanied by environmental contamination or which may cause damage, etc., to residents in the surrounding areas.

Technické reporty Yokogawa

Conventional safety instrumented system (SIS) is typically installed separated from a distributed control system (DCS) to eliminate interference from the DCS and assure safety. However, users increasingly wish to integrate SIS with DCS while maintaining the safety of safety controllers.



    Yokogawa South Africa was appointed to design, supply and commission the Integrated Control and Safety System (ICSS) as well as the overall Terminal Management System at Sunrise Energy’s liquid petroleum gas (LPG) Import Terminal, the largest on- and offshore open-access LPG import terminal facility in Africa. Yokogawa’s Terminal Management System, Terminal Logistic Suite VP (TLSVP), was designed and developed to meet the exacting operational demands and logistic needs in terminals. Yokogawa’s experienced engineering resources ensured the project was successfully delivered, enabling Sunrise Energy to provide accurate mass balances and efficient terminal operations to its customers.

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