Download Operating Instructions - VEGABAR 52 - 4...20mA/HART

Functional safety acc. to IEC 61508-4 (SIL)
values relate to an average ambient temperature during
operation of +40°C (104°F). The calculations are further based
on the instructions stated in chapter "Planning".
Overfill protection/monitoring upper pressure value
Interference current
"fail high"
"fail low"
λsd
378 FIT
20 FIT
λsu
233 FIT
233 FIT
λdd
147 FIT
505 FIT
λdu
183 FIT
183 FIT
DCS
62 %
8%
DCD
45 %
73 %
Dry run protection/monitoring lower pressure value
Interference current
"fail high"
"fail low"
λsd
149 FIT
495 FIT
λsu
233 FIT
233 FIT
λdd
366 FIT
20 FIT
λdu
194 FIT
194 FIT
DCS
39 %
68 %
DCD
65 %
9%
Fault reaction time
Error E013 (no measured value)
<2 sec
Error E041 (hardware error)
<20 sec
Error E036 (software error)
<1 h
General data
MTBF = MTTF + MTTR
27507-EN-051004
max. useful life of the measuring system for the safety
function
Proven in use
VEGABAR 52 - 4 … 20 mA/HART
0.9x106 h
approx. 10 years
The judgment of the modification service was part to ensure
"Proven in use".
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