SMC Sierra Monitor 3600-I, Manual

Page: 64 / 66

Model 3600-I IR3 Flame Detector
Page 64 of 66
APPENDIX E. SIL-2 FEATURES
Appendix E.1. 3600-LB and L4B Flame Detector
This appendix details the special conditions to comply with the requirements of EN 61508 for SIL 2.
The 3600-I Flame Detector can only be used in low or high demand mode applications, see IEC 61508.4.
Appendix E.1.1. Safety Relevant Parameters
Do a functional check of the detector every 30 days.

HFT: 0

PFD: 1.9 x 10 -
4 (≈ 2% of SIL-2) if only Alarm Relay is used for alerting.

PFD: 1.9 x 10 -
4 (≈2% of SIL-2) if 0-20mA – interface is used as alarm.

SFF: 97% fulfills the conditions of EN 61508 for SIL2
Appendix E.1.2. Guidelines for Configuring, Installing, Operating and Service
The alert conditions according to SIL 2 can be implemented by either of the following:

Alert signal via 20mA current loop

Alert signal via alarm relay and the fault relay
Appendix 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.
4. The set-up parameters must be verified (as described in Appendix E.1.2.2 , point 1 and in
Appendix E.1.2.3 , point 1) and the function of the 3600 Flame Detector (flame detection,
function of the 0-20mA interface, relay functions) must be checked completely.
Appendix E.1.2.2. Using the 0-20mA Interface for Alerting
1. The following parameters shall be set:

AUTOMATIC BIT test = on

Connected to 0-20mA Terminals
2. The following allowed output current must be supervised with an accuracy of ± 5%:

Normal State = 4mA

Warning State = 16mA

Alarm State = 20mA
3. The output current must be supervised regarding the over-and under run of the 0-20mA.
NOTE: The 0-20mA can be used as low and high demand mode.