FV-40 Series Flame Detector
087-0056 REV F
73
E SIL-2
Features
➣
In this appendix…
FV-40 Series Flame Detector
E.1
FV-40 Series Flame Detector
This appendix details the special conditions to comply with the requirements
of EN 61508 for SIL 2. (Approval pending for some models).
The FV-40 Series Flame Detector can only be used in low or high demand
mode applications, see IEC 61508.4, Chapter 3.5.12.
E.1.1
Safety Relevant Parameters
Perform the following functional checks of the detector:
Alternative 1
: Functional check of the detector every 180 days:
HFT
: 0
PFD
: 3.0 x 10 -4 (
≈
3% of SIL-2) if only Alarm Relay is used for
alerting.
PFD
: 3.2 x 10 -4 (
≈
3.2% of SIL-2) if 0-20mA – interface is used as
alarm.
PFH
: 1.5 x 10 –7 1/h (
≈
14.9% of SIL-2) for 0-20mA application.
SFF
: 95% fulfills the conditions of EN 61508 for SIL2
Alternative 2
: Functional check of the detector every 365 days:
HFT
: 0
PFD
: 4.5 x 10 -4 (
≈
4.5% of SIL-2) if only Alarm Relay is used for
alerting.
PFD
: 4.9 x 10 -4 (
≈
4.9% of SIL-2) if 0-20mA – interface is used
signal current as alarm.
PFH
: 1.5 x 10 –7 1/h (
≈
14.9% of SIL-2) for 0-20mA application.
SFF
: 95% fulfills the conditions of EN 61508 for SIL2
E.1.2
Guidelines for Configuring, Installing, Operating and
Service
The alert conditions according to SIL 2 can be implemented by an:
Alert signal via 20mA current loop
or
Alert signal via alarm relay and the fault relay