LGM: Signaline LocatorPlus and LocatorPlus-EN achieve SIL 2 capability
Iain Hoey
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LGM announcement on LocatorPlus SIL 2 capability
Signaline has announced that its LocatorPlus and LocatorPlus-EN Linear Heat Detection Controllers have been independently assessed and confirmed capable for use in low demand mode safety functions up to, and including, Safety Integrity Level (SIL) 2.
The announcement was published by LGM Products, manufacturer of the Signaline linear heat detection range.
The Functional Safety Capability Statement covers suitability for low demand mode safety functions against the International Electrotechnical Commission (IEC) 61508 functional safety framework.
What the IEC 61508 assessment covered
In its published statement, LGM Products said the assessment was performed to IEC 61508 Edition 2, Parts 1 to 3 and evaluated random hardware failures and architectural constraints for both devices.
The results show SIL 2 architectural capability with a Safe Failure Fraction (SFF) of 92% for each model.
The analysis includes quantified dangerous undetected and detected failure rates for each controller.
The statement says the capability applies within low demand Safety Instrumented Functions (SIFs).
It adds that full SIF compliance requires system level verification across the sensor, logic solver and final element.
Product context and approvals listed
In the same statement, LGM Products described the Signaline LocatorPlus as a dual zone controller and alarm locator for Signaline FT, FT-R and FT-X linear heat detection cables.
It said the LocatorPlus carries third party approvals including UL, cUL and FM, alongside its SIL 2 capability statement for low demand SIFs.
LGM Products also described the Signaline LocatorPlus-EN as complementing the FT-EN cable family, providing dual zone monitoring and automatic alarm location in EN5428 approved systems, now supported by the same SIL 2 capability for low demand safety functions under IEC 61508.
The statement lists typical SIL 2 specification scenarios including industrial process areas with combustible materials such as conveyors, cable trays and service tunnels, plus energy and utilities infrastructure such as fuel storage sites and transformer galleries.
LGM Products said Signaline also holds approvals including VdS, UL, cUL, FM and UL EU, plus country specific approvals including Activfire, HKFSD, UAE CD and TFTF.