
The achievable SIL is determined by the following safety characteristics:
●
Average probability of dangerous failure of a safety function in case of demand (PFD
AVG
)
● Hardware fault tolerance (HFT)
● Safe failure fractions (SFF)
srli2
→
srlin2
srlin2
"srli2" or "srlin2" is a type of square root extracting characteristic curve for the output current.
This characteristic curve type is proportional to the flow rate, linear in two levels up to the
application point and has a pre-defined application point of 10%.
"srli2" or "srlin2" are synonymous and technically there is no difference between them. The
abbreviation "srli2" is used in sections that refer to the on-site operation of the pressure
transmitter. The reason for the abbreviation is that the pressure transmitter display is restricted
to five characters. The abbreviation "srlin2" is used for HART operation.
Glossary
SITRANS P, DS III series with HART
226 Operating Instructions, 09/2012, A5E00047092-08
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