MSA DF-8500 - Special Conditions for the Safe Use According to SIL Applications

DF-8500 Gas Detector
10 Special conditions for the safe use according to SIL
applications
The DF-8500 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 CSA. The tables below list the SIL parameters for this device.
Safety relevant parameters for the DF-8500 Gas Monitor:
64
PTI
Sensor PFD1oo1
PFD1oo1
% SIL2
PFH1oo1
PFH1oo1
% SIL2
PFD1oo2
PFD1oo2
% SIL3
PFH1oo2
PFH1oo2
% SIL3
16
weeks
Toxic gas 2.67E-04
2.67%
1.38E-07
13.8%
1.34523E-05
1.34%
6.9427E-09
6.94%
Oxygen gas 2.61E-04
2.61%
1.36E-07
13.6%
1.31631E-05
1.32%
6.87451E-09
6.87%
52
weeks
Toxic gas 6.83E-04
6.83%
1.38E-07
13.8%
3.47425E-05
3.47%
7.04594E-09
7.05%
Oxygen gas 6.73E-04
6.73%
1.36E-07
13.6%
3.424E-05
3.42%
6.97577E-09
6.98%
Sensor
λ
S λD λDD λDU SFF
Combustible gas
722 1255 1107 148 92.5%
Toxic gas
725 1188 1050 138 92.8%
Oxygen gas
713 1133 997 136 92.6%
Hardware safety integrity level (SIL)
SIL2
Systematic Capability (SC)
SC 3
Type
B
Safety structure
1oo1 or 1oo2
HFT
0
PFD, PFH,SFF
See table
λS, λD, λDD, λDU
See table
MTTR
72 hr.
Proof test interval (PTI)
See table
Ambient Temperature
-40
℃
~70
℃
Hardware version
3
Software version
0.04