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The failure data given in Tables 1 and 2 above was derived using the following:
Proof Test interval = 1 year
Mean Time to Repair = 8 hours
The LC3050/LP30 system is considered to be a Type A equipment with reference to
IEC61508-2, paragraph 7.4.3.1.2.
The highest systematic SIL capability is SIL3
Fault Tolerance is '0' for a single LC3050 as it has no inbuilt redundancy. (Note that the
LC3050 is intended to be used in redundant pairs).
Environment / stress criteria – FMEDA carried out using a quality factor and environmental
factor of 1.
Environmental Limits – 0
Lifetime/ replacement limits – electrolytic capacitors to be replaced every 8 years
Management of Functional Safety
Spirax Sarco Ltd have a certified Functional Safety management system in place.
Date of certification: 15
Certificate No.: SIRA CASS 00020/00
Scope: Liquid Level Controllers, Alarm subsystems and indicators
Applicable Lifecycle Phase: Phase 10
Conditions of Safe Use
To maintain functional safety the following conditions of safe use must be observed:
1.
The Product shall be installed, operated and maintained by competent personnel in
accordance with the instructions in the Manufacturer's Installation, operations and
Maintenance manual;
2.
The product shall be subject to proof tests as specified in the Manufacturer's Installation
and Maintenance Manual at intervals not exceeding those given on Page 3 of this
Declaration of Conformity;
3.
Only the Manufacturer's recommended replacement parts shall be used;
4.
The serial communication port is not and must not be used as part of the safety function;
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