BERTHOLD TECHNOLOGIES LB 480 - Page 105

SENSseries LB 480 Level measurement
BERTHOLD TECHNOLOGIES GmbH & Co. KG
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Volume 1 7 Functional Safety
1
7.11.2 SIL 3 in System Architecture 1oo2 (2-channels)
In a cascade, the values for PFD and PFH must be multiplied with
the number of detectors.
Parameter Value
Protective function - Limit level measurement
- Level measurement
- Density measurement
SIL SIL 3 with two detectors LB 480
(SIL3 SC3 FT1)
HFT 1
Device type B
MTTR, MRT 72h
Beta 5%
PFDg for T1 = 1 year <5.6E-05
PFDg for T1 = 2 years <1.0E-04
PFDg for T1 = 5 years <2.4E-04
PFDg for T1 = 10 years <4.7E-04
PFH <2.11E-07 1/h
MTBF >19 years
Operating mode Low Demand or High Demand
Response time 10sec
DC 95%