Endress+Hauser Proline Prosonic Flow P 500 Functional Safety Manual page 6

Manufacturer' s Declaration
Hardware safety integrity
FMEDA
Safety function(s)
1)
λ
DU
1)
λ
DD
1)
λ
SU
1)
λ
SD
SFF - Safe Failure Fraction
2)
PFD for T = 1 year (single-channel architecture)
avg 1
PFH
3)
PTC
4)
MTBF
tot
5)
Diagnostic test interval
6)
Fault response time
Recommended test interval T
1)
FIT = Failure In Time, number of failures per 10
2) Valid for averaged ambient temperatures up to 40 °C (104 °F) in accordance with the general standard for devices
with SIL capability.
3) PTC = Proof Test Coverage (diagnostic coverage achieved by device failure detection during manual proof testing)
4) This value takes into account all failure types of the electronic components as per Siemens SN29500
5) All diagnostic functions are executed at least once during this time. For operation in high demand mode
according to IEC 61508, the safe use of the devices is limited to a safety function demand rate of ≤ 1/50 h.
6) Maximum time between fault detection and fault response.
Note
The measuring device has been developed for use in "Low Demand" and "High Demand" mode.
Explanation
Our in-house quality management system saves information on safety-related systematic errors that will become
known in the future.
6
Single-channel service
(HFT = 0)
Multi-channel service
(HFT ≥ 1)
1
9
 SIL 2 capability
 SIL 2 capability
h
Proline Prosonic Flow P 500 HART
 SIL 3 capability
 SIL 3 capability
Min., Max., Range
268 FIT
4062 FIT
2736 FIT
4605 FIT
97 %
-4
11.8 · 10
1.4 · 10 -7
Up to 99 %
60 years
30 min
30 s
1 year
Endress+Hauser