Safety Relevant Key Indicators - Siemens SITRANS F Additional Operating Instructions

SITRANS FX330

5.4 Safety relevant key indicators

All values shown in the following table are related to reference conditions according to [N3]:
• Temperature: +15...+25°C / +59...+77°F
• Pressure: 1013 mbar ±50 mbar / 14.69 psi ±0.73 psi
• Relative air humidity: 60% ±15%
Key indicator
Device Type
Systematic Capability
Safety Integrity Level
Architecture
HFT
Failure current (failure notification)
Operation mode
SFF
λ
S
λ
DD
λ
(= PFH)
DU
λ
(= PFH) for homogeneous redundant
DU
configuration 1
PFD (T
AVG
PFD (T
AVG
PTC 4
FRT 5
MTBF 7
1 The PFH values for the dual version, or other device configurations deployed in homogeneous
redundant configuration (for details refer to
SACs 13 and 14 are fulfilled.
2 If deployed within specified environment conditions (for details refer to
page 29).
3 For reference conditions, but with an extended temperature range up to +40°C / +104°F.
4 Value depends on the depth of the proof test (for details refer to
test
on page 19).
5 This is the part of the process safety time which must be reserved for the safety reaction of
the flowmeter or for the delay of its safety function respectively.
6 Assuming MTTR = MTR = 8 hours.
7 Related to hardware components relevant for safe operation.
10/2017 - A5E40875009-AB EN
= 1 year) 2, 6
proof
= 12 years) 3, 6
proof
Value
Type B system
3
Single channel (HFT = 0)
Homogeneous redundant
(HFT = 1) 1
1oo1 D
0
For persistent failures: < 3.4 mA
For transient failures: 3.5...3.6 mA
Alternatively for failures: > 21.5 mA
Low and high demand, continuous mode
Non-Ex/Ex i Non-Ex/Ex i
Non-Ex/Ex i Non-Ex/Ex i
C C C C
94.3%
721 FIT
371 FIT
46.4 FIT
< <1 FIT
-4
< 2 * 10
-3
< 3 * 10
12%...97%
30 seconds
68 years
Operation modes
www.siemens.com/flow
TECHNICAL DATA
SIL 2
SIL 3
Ex d/Ex t/Ex nA Ex d/Ex t/Ex nA
Ex d/Ex t/Ex nA Ex d/Ex t/Ex nA
F F F F C C C C
94.6% 95.2%
736 FIT 870 FIT
393 FIT 456 FIT
46.4 FIT 47.2 FIT
66 years 60 years
on page 10) is applicable only, if
Useful lifetime
Operation modes and proof
5
F F F F
95.2%
884 FIT
477 FIT
47.2 FIT
59 years
on
27