Proservo NMS80/81/83
Endress+Hauser 5
Other safety-related
characteristic values
Characteristics as per IEC 61508 Value
Safety function MIN, MAX, Range
SIL SIL 2 (single-channel architecture 1oo1)
SIL 3 (multi-channel architecture, also with homogeneous
redundancy, e.g. 1oo2, 2oo3)
HFT 0
Device type B
Operating mode Low demand mode, high demand mode
SFF 98 %
MTTR 8 h
Recommended time interval for proof-testing T
1
3 years
λ
sd
23 FIT
λ
su
2 528 FIT
λ
dd
6 205 FIT
λ
du
185 FIT
λ
tot
1)
8 941 FIT
PFD
avg
for T
1
= 1 year
2)
8.59
-4
PFD
avg
for T
1
= 2 years
2)
1.67
-3
PFH 1.85
-7
h
-1
MTBF
1)
28 years
Diagnostic test interval
3)
60 min
Fault reaction time
4)
60 s
System reaction time
5)
In "Expert mode":
User configurable
1) According to Siemens SN29500. This value takes into account failure types relevant to the function of the
electronic components.
2) Valid for ambient temperature up to +40 °C (+104 °F). Where the average temperature when in continuous
use is in the region of +60 °C (+140 °F), a factor of 2.1 should be taken into account.
3) During this time, all diagnostic functions are executed at least once.
4) Time between error detection and error response.
5) Step response time as per DIN EN 61298-2: 274 s
Useful lifetime of electric
components
The established failure rates of electrical components apply within the useful lifetime as per
IEC 61508-2:2010 section 7.4.9.5, note 3. In accordance with DIN EN 61508-2:2011 section
7.4.9.5, national footnote N3, appropriate measures taken by the manufacturer and operator can
extend the useful lifetime.
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