PCB Piezotronics IMI SENSORS HT622B01 Installation And Operating Manual page 22

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PCB FUNCTIONAL SAFETY SIL SUMMARY AND RESULTS
Summary
This report details the results of the reliability analysis performed on the PCB Piezotronics ICP® Sensor
model 62X series. Design changes from this documentation package would need to be evaluated for the
impact on the reliability characteristics. These results are based on the following PCB Piezotronics
documentation.
1. Electrical schematic 65009-NR
2. Electrical schematic 65010-NR
3. Electrical schematic 65038-NR
4. 622801 MTTF Calculation
5. 62X Returns FY 2018
Results
The reliability calculations were conducted at the component and circuit level using the methodology
outlined in MIL-HDKB-217F. Product level failure parameters were then calculated in accordance with
the functional safety approach of IEC 61508-1:2010, IEC 61508-2:2010, IEC 61508-6:2010, IEC
61508-7:2010. The results from the FMEA are given below for the ICP® Sensor model 62X:
Name Result
Architecture
lool
Proof test interval (Annual)
81760 h
PFDavg
7.99x10 5
SFF
78.18%
HFT
0
SIL Capability (Low Demand Mode)
2
SIL Capability (Continuous Demand Mode) 2
PCB SIL Sensor Rating
Report No: 103685042CSLT-002
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