© exida.com GmbH berthold 0408-10 r003 v1r3.doc, Apr. 12, 2007
Rainer Faller Page 7 of 18
2.4 Reference documents
2.4.1 Documentation provided by the customer
[D1] Circuit Diagram 36134SP, Rev 05;
Power Supply UniProbe 24V AC/DC
AC wide range
Circuit Diagram Power Supply, AC wide range
[D2] PMA30 D 5/24 und PMA15 S24 Kalkulation MTBF nach MIL HDBK 217F,
Notice 2, Ground Benign, Temperatur 25°C
MTM Power Mellenbach
[D3] Circuit Diagram 21324SP, Rev 04
Voltage Divider
Circuit Diagram Voltage Divider
[D4] Circuit Diagram 48631SP, Rev 04,
5 pages, Digital Board UniProbe
(35966SP übergangen in 48631SP)
Circuit Diagram Digital Board UniProbe
[D5] Circuit Diagram 40998SP, Rev 01,
Pre-Amplifier / H.V.
Circuit Diagram Pre-Amplifier / High Voltage
[D6] MTTF_XP3230_2b.xls; 20.4.2005 Berthold Technologies, Process Control /
Estimation of useful lifetime XP3230
[D7] FMEDA Berthold UniProbe Gesamt
040927_Ergebnisse_2 Silva
Kommentare (2).xls; 25.8.2006
Documenation of the fault insertion tests
[D8] 15.821 (Report DAG437BE to Req for
MTTF of XP3230, XP3240,
Berthold Technologies).pdf; 8.9.2004
XP3230B and XP3240B PMTs - MTBF
[D9] Sicherheitshandbuch, Rev 00
Id 38477BA15, SW-Version 2.0
Safety Manual LB490
2.4.2 Documentation generated or reviewed by exida.com
[R1] FMEDA Berthold UniProbe ACDC-DC V654 061010.xls; 10.10.2006
[R2] FMEDA Berthold UniProbe Process Output Neu V654 061010.xls; 10.10.2006
[R3] FMEDA Berthold UniProbe Digital+Amplifier Neu V654 061010.xls; 10.10.2006
[R4] Failure rate Photo Multiplier: Field failure analysis V002.xls; 10.10.2006
[R5] FMEDA Berthold UniProbe Gesamt 061010.xls; 10.10.2006
[R6]
Safety Manual Checklist V1 R1.1.doc of 16.12.04
© exida.com GmbH berthold 0408-10 r003 v1r3.doc, Apr. 12, 2007
Rainer Faller Page 8 of 18
3 Description of the analyzed modules
3.1 System description
The analyzed system is the Level Transmitter LB490 Uni-Probe.
This transmitter is designed to perform measurements for fluids or bulk material level. The
measurement is based on the physical law of the attenuation of Gamma radiation as it passes
through medium. The Level Transmitter LB490 Uni-Probe combines long years of experience by
Berthold Technologies with the Gamma measurement technology.
The Level Transmitter LB490 Uni-Probe is considered to be a Type B sub-system with a
hardware fault tolerance of HFT=0.
See Figure 1 for a system overview.
Figure 1: System Overview
The pulse reading is converted via the evaluation unit into a 4..20mA signal. The HART™
communication is not considered safety-related and not subject of this report.
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