Spectrex SafEye Xenon 700S, User Manual

Page: 77 / 80

TM 799200 Rev. (4), April 2017 77
Appendix D: SIL-2 Features
In this appendix…
Safety Relevant Parameters page 77
Guidelines for Configuration, Installation,
Operation, and Maintenance page 77
Miscellaneous page 78
This appendix details the special conditions for compliance with the
requirements of EN 61508 for SIL-2.
The SafEye 700S can be used in low and high demand mode applications,
see
IEC 61508.4, Chapter 3.5.12 .
D.1 Safety Relevant Parameters
Perform the following functional check of the detector every 6 months:
Periodic Maintenance , page 61 and Functional Check of Unit , page 62)
 HFT: 0
 PFD: 3.3 x 10
-4
(3.3% of SIL-2)
 PFH: 1.5 x 10
-4
(15% of SIL-2) - For 0–20mA signal current application.
 SFF: Fulfills the conditions of EN 61508 for SIL-2.
D.2 Guidelines for Configuration, Installation,
Operation, and Maintenance
Alarm conditions complying with SIL-2 can be implemented only with 0–
20mA outputs.
D.2.1 Conditions for Safe Operation
 The SafEye 700S should consist only of the approved hardware and
software modules.
 The 24C power supply must fulfill the requirements for “safe low voltage”
according to EN 60950 (PELV/SELV).
 After installation and configuration the setup parameters must be
verified and the function of the SafEye 700S (gas detection, function of
the 0–20mA interface, relay functions) must be checked completely.