Subscribe | Visit Store Home Products About Blog Events Resources Careers Contact Training Store Home > Products Overview Introduction Benefits SIL Capable Figure 1 SIL Levels Figure 2 SIL Capable An Overview of Hochiki's SIL2 Capable Fire Detection Range. Products & Data Resources INTRODUCTION What is SIL? SIL is an acronym for Safety Integrity Level, and is a system used to quantify and qualify the requirements for Safety Instrumented Systems. The International Electro-technical Commission (IEC) introduced the following industry standards to assist operators with quantifying the safety performance requirements for hazardous operations: IEC 61508 Functional Safety of Electrical/Electronic/ Programmable Electronic Safety-Related Systems IEC 61511 Safety Instrumented Systems for the Process Industry Sector These standards have been widely adopted in the hydrocarbon and oil and gas industries as a means of improving safety and availability of Safety Instrumented Systems. Safety Integrity Levels are part of a larger scheme called Functional Safety that deals with techniques, technologies, standards and procedures that help operators protect against hazards. Simply put, SIL levels are targets applied to the reliability and performance of the safety systems used to protect hazardous activities such as hydrocarbon refining or production. BENEFITS Main Benefits of our SIL2 Range APPROVALS All of the SIL products are approved to SIL Level 2 by the International Electro-technical Commission. QUALITY High quality products ensures long term reliability. WIDE RANGE Hochiki's SIL offers a diverse range of products, including both addressable and conventional products suitable for many applications. SIL CAPABLE SIL2 Capable Range ALN-EN/SIL SMOKE SENSOR The ALN-EN/SIL incorporates Hochiki's newest High Performance Chamber Technology removing the need to use Ionisation Smoke Sensors in the majority of applications. This also allows the sensor threshold level to be increased, thereby improving the signal to noise ratio and reducing susceptibility to false alarms. ATJ-EN/SIL MULTI-HEAT SENSOR The ATJ-EN/SIL incorporates a variable temperature heat element and a rate of rise heat element, both of which are controlled from the Control Panel, allowing either thermal element or both elements simultaneously to be active in making the fire decision. ACC-EN/SIL MULTI SENSOR The ACC-EN/SIL has 3 modes, which are controlled from the Control Panel, allowing either the optical element or thermal element or both elements to be active in making the fire decision. The sensor polling LEDs can be controlled via the Control Panel (pulsing/non-pulsing). The ACC-EN/SIL smoke chamber can esily be removed or replaced for easy maintentance. FIGURE 1 Hazardous Activity SIL LEVELS How are they calculated? There are four SIL levels. The higher the perceived associated risk, the higher the performance required of the safety system and therefore the higher the SIL rating number. Once the scope of an activity is determined, the operator can identify the possible hazard(s) and then assess their potential severity. The risk associated with a hazard is identified by assessing the likely frequency of occurrence and the potential consequences if the hazard is realised. The operator must then assign a number for the severity of consequence and frequency. The figure above shows multiple layers of protection are used to develop the required safety strategy. Safety Instrumented System has been highlighted because this is the layer that applies to Hochiki's SIL 2 capable fire detection equipment. The SIS assists in reducing the frequency of the likely manifestation of the hazard and therefore improves the reliability of the system. The consequence of a failure is not addressed by SIS but by other aspects of the risk reduction strategy. FIGURE 2 Matrix These numbers are then entered into a matrix (see example below) to allow the operator to assign the required SIL rating to protect against the hazard. Many tools are available to assist an operator with this process, for example HAZOP (Hazard & Operability) software. _______ Our SIL 2 capable range of products has been independently assessed by Engineering Safety Consultants Limited and is considered capable for use in a SIL 2, low demand Safety Function with regard to random failure rates. Individual certificates are available to download from our store. Learn more Products & Data ENQUIRE NOW GET IN TOUCH Terms & Conditions Terms of use Privacy Policy Use of Cookies Environmental Policy QUICK LINKS Home Sitemap About Events Resources Careers Contact Training Consultant Toolbox COVID-19 Risk Assessment INFORMATION Hochiki Europe (UK) Ltd Grosvenor Road, Gillingham Business Park, Gillingham, Kent ME8 0SA Main switchboard +44 (0)1634 260133 | email info@hochikieurope.com ©2021 Hochiki Europe, LLC. All Rights Reserved. Website by Storm12 C Some of these cookies are essential, while others help us to improve your experience by providing insights into how the site is being used. Necessary Cookies Necessary cookies enable core functionality. The website cannot function properly without these cookies, and can only be disabled by changing your browser preferences. Analytical Cookies Analytical cookies help us to improve our website by collecting and reporting information on its usage. ON x