Functional-safety evidence
Safety Integrity Level (SIL) for fire-and-gas logic solvers
Risk-reduction integrity assigned to a defined safety function implemented by electrical, electronic or programmable electronic systems.
Where it matters
Where Safety Integrity Level (SIL) applies
Important when a hazard and risk assessment allocates a target SIL to a safety instrumented or related safety function.
Process safety
Machinery safety
Emergency isolation
Certification coverage
How to interpret this certification
Each certificate covers specific products and uses. These details explain what is covered.
SIL
Understanding the mark
What the mark or label means
SIL is not a product sticker or general quality mark. It is a level assigned to a defined safety function. A component certificate or safety manual may state systematic capability or suitable-use limits, but the complete loop still needs verification.
Fire safety products often covered
- Fire-and-gas logic solvers
- Safety-rated gas and flame detectors
- Shutdown relays and interfaces
- Emergency isolation equipment
- Programmable safety controllers
Points to check before you buy
- 01
IEC 61508 defines SIL 1 to SIL 4; SIL 4 represents the highest integrity requirement.
- 02
Record the demand mode, target failure measure, hardware fault tolerance and systematic capability.
- 03
Use the certified failure data, proof-test interval, useful life and diagnostic assumptions in the loop calculation.
- 04
SIL is achieved through the complete safety lifecycle, including design, software, commissioning, proof testing and management.
Before you buy
What to check before relying on this certification
Certification is normally limited to a named model, configuration, standard and use. These checks turn a marketing claim into a procurement record.
- 01
Identify the safety function, required SIL and demand mode; do not assign SIL to an entire plant by association.
- 02
Review the certificate and safety manual for systematic capability, hardware constraints and architectural limits.
- 03
Use the stated failure rates, proof-test interval, diagnostic coverage and useful lifetime in the verification calculation.
- 04
Confirm the approved configuration includes the application software, commissioning, proof testing and lifecycle management requirements.
Matched products and brands
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Products recorded with Safety Integrity Level (SIL)
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Links & Sources
Standards, listings and certificate status can change. Use the issuing body’s source before final approval.
Knowledge base
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Knowledge base
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Browse standards, product selection, system design, maintenance and market-specific guidance.
View all resourcesCommon Questions
Frequently Asked Questions
Can a detector itself be 'SIL 2'?
A certificate may show that the detector is suitable for use in certain SIL applications. The actual SIL applies to the complete safety function, not the device in isolation.
Does SIL certification prove fire-detection performance?
No. It addresses functional integrity of a safety function. Detection sensitivity, coverage and fire-code compliance need separate evidence.
Does Safety Integrity Level (SIL) apply to every product made by a certified brand?
No. It normally applies only to the models, variants, uses and conditions named in the current certificate or listing.
What should I include in a purchase order?
State the exact model, required certification and standard, destination market, documents to be supplied and any system compatibility or witnessing requirements.