Appendix Esil-2 Features; Safety Relevant Parameters; General Conditions For Safe Use - Emerson Rosemount 935 Reference Manual
Open path combustible gas detector
Hide thumbs
Also See for Rosemount 935:
- Reference manual (56 pages) ,
- Quick start manual (40 pages) ,
- Quick start manual (40 pages)
Table of Contents
Advertisement
Reference Manual
00809-0100-4035
E
SIL-2 features
This appendix details the special conditions to comply with the requirements of EN 61508
for SIL-2.
The Rosemount 935 open path combustible gas detector can be used in low and high
demand mode applications. See IEC 61508-4:2010, Chapter 3.5.16.
E.1
Safety relevant parameters
Type: B
Structure: 1oo1
HFT: 0
Mean time to repair: 72 hours
Ambient temperature: maximum 149 °F (65 °C)
Proof test interval: 52 weeks (1 year)
λ
= 2056.1 fit
S
λ
= 1976.1 fit
D
λ
= 114.8 fit
DU
λ
= 1933.4 fit
SD
λ
= 1861.4 fit
DD
SFF = 97%
PFD
avg
PFH = 1.15 x 10
E.2
General conditions for safe use
•
The Rosemount 935 should consist only of the approved hardware and software
models.
•
Consider the application advice and limitations of the Manual. For calibration and
maintenance, consider the regional and national regulations.
•
The 24 V power supply must fulfill the requirements for PELV/SELV of EN 60950.
•
The HART
safety related data.
•
The alert conditions according to SIL-2 can be implemented by an alert signal via the
20 mA current loop.
•
After installation and configuration, the operator must verify the set-up parameters
and check the function of the Rosemount 935.
Rosemount 935
-4
= 6.45 x 10
-7
1/h
®
and RS-485 interfaces are not allowed to be used for the transmission of
DC = 94%
PFD
= 6.4%
%_SIL2
PFH
- 11.5%
%_SIL2
SIL-2 features
May 2022
71
Advertisement
Table of Contents
