An Overview of Hochiki's SIL2 Capable Fire Detection Range.
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:
Functional Safety of Electrical/Electronic/
Programmable Electronic Safety-Related Systems
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.
All of the SIL products are approved to SIL Level 2 by the International Electro-technical Commission.
High quality products ensures long term reliability.
Hochiki's SIL offers a diverse range of products, including both addressable and conventional products suitable for many applications.
The SIL range has been independently assessed by Engineering Safety Consultants.
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.
CCP-E-IS/SIL Manual Call Point
The CCP-E-IS/SIL is a conventional call point based upon the industry standard KAC world series housing, and which can be used in hazardous areas.
Modules & DIN Modules.
Our Addressable Modules provide a range of functions, providing an interface between the loop and a host of third party equipment. The majority of our modules feature an integral short-circuit isolator and are available in either an enclosed boxed version or a DIN rail mountable version.
DCD-1E-IS/SIL Rate of Rise Detector
The DCD-1E-IS/SIL is an Intrinsically Safe Conventional Rate of Rise Heat Detector with a 60° fixed temperature element designed for use in hazardous areas. The unit also features a remote indicator output.
SLR-E-IS/SIL Smoke Detector
Model SLR-E-IS/SIL is a Photoelectric Smoke Detector designed for use in hazardous areas which also incorporates a remote indicator output and a removable chamber for easy maintenance.
Wall Sounders & Beacons
Model CHQ-WS2/SIL is an addressable loop powered Wall Sounder innovatively designed to provide a range of tones and volumes with a maximum output of up to 102dB(A) (±2dB(A)) with low current consumption. The CHQ-WSB2/SIL range comprises of EN54-23 compliant addressable loop powered Wall Sounder Beacon as per the CHQ-WS2/SIL, but with the addition of an integral LED beacon.
Base Sounders & Base Sounder Beacons
Model YBO-BS/SIL is an addressable loop powered Base Sounder innovatively designed to give a range of tones and volumes with a maximum output of up to 98 dB(A) (±2 dB(A)) with low current consumption The YBO-BSB2/SIL range consists of ‘O' Rated EN54-23 compliant addressable loop powered Base Sounders, with integral Beacon, givng a red or white flash.
HCP-E(SCI)/SIL Call Point
Model HCP-E(SCI)/SIL is a Manual Call Point with integral short-circuit isolator, which is fully compatible with Hochiki's ESP analogue addressable protocol. The unit incorporates a bi-coloured LED
HCP-W(SCI)/SIL Call Point
Model HCP-W(SCI)/SIL is a weatherproof Manual Call Point with integral short-circuit isolator, which is fully compatible with Hochiki's ESP analogue addressable protocol.
YBN-R/3(SCI)/SIL Mounting Base
Model YBN-R/3(SCI)/SIL is a sensor mounting base featuring an integral short-circuit isolator which will detect and isolate short-circuits on the loop. When a short-circuit is detected during power up the unit will drop the power to the rest of the loop.
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.
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.
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