MSA PRIMAX IR Mode D'emploi page 5

CERTIFICATIONS and FAILURE RATE DATA
The PrimaX IR Gas Monitor has been subjected to rigorous reliability and functional safety
assessments, which have culminated in the gas monitor being certified to IEC 61508 by
TÜV Rheinland Industrie Service GmbH. The following tables list the SIL parameters for
this device.
Safety relevant parameters for the PrimaX IR Gas Monitor:
Type
Structure
HFT
Safe Failure Fraction (SFF)
DC
λ
(Detected safe failure rate)
S
λ
(Undetected dangerous failure rate)
DU
λ
(Dangerous failure rate)
D
λ
(Detected dangerous failure rate)
DD
PFD, PFH
MTTR
TI (Test Interval)
Ambient Temperature
PFD
1001
-4
16weeks TI 2.2x10
-4
52weeks TI 5.4x10
PFD PFD PFD
1001 1002
% SIL2 % SIL3
-5
2.2% 1.1x10 1.1%
-5
5.4% 2.7x10 2.7%
5
B
1oo1 or 1oo2
0 or 1
95%
91%
1154.7fit
104.1fit
1154.7fit
1050.6fit
See table
72 hr
See table
40C
PFH PFH
1002 1001 1001
% SIL1
1.04%
1.04%
SIL SAFETY MANUAL
PFH PFH
1002 1002
% SIL3
5.2%
5.3%