Sierra Monitor Corporation 3600I, Инструкция по эксплуатации, Страница: 63 / 65

3600I
Page: 55
E SIL-2 FEATURES
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In this appendix…
3600I Flame Detector page 55
E.1 3600I FLAME DETECTOR
This appendix details the special conditions to comply with the requirements of EN
61508 for SIL 2.
The 3600I 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
E.1.2.1 CONDITIONS FOR SAFE OPERATING
1 The flame detector shall consist only of the approved hardware and software
modules.
2 The 24V power supply must fulfill the requirements for PELV / SELV of EN 60950.
3 The automatic BIT (Built-In-Test) must be activated.