Siemens SIPART PS2 series User Manual

Abbreviation Full term in English Meaning
SFF Safe Failure Fraction Proportion of safe failures:
Proportion of failures without the potential to bring the safety-in‐
strumented system into a dangerous or non-permissible func‐
tional status.
SIL Safety Integrity Level The international standard IEC 61508 defines four discrete Safe‐
ty Integrity Levels (SIL 1 to SIL 4). Each level corresponds to a
range of probability for failure of a safety function. The higher the
Safety Integrity Level of the safety-instrumented system, the low‐
er the probability that it will not execute the required safety func‐
tions.
SIS Safety Instrumented System A safety-instrumented system (SIS) executes the safety func‐
tions that are required to achieve or maintain a safe status in a
system. It consists of sensors, logic unit/control system and final
controlling elements.
Abbreviations
G.2 Abbreviations for functional safety
SIPART PS2 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E00074631-AE 323

Siemens SIPART PS2 series Specifications

General

Supply Pressure	1.4 to 7 bar (20 to 100 psi)
Enclosure Rating	IP66/NEMA 4X
Type	Electropneumatic
Input Signal	4-20 mA
Stroke Range	3 to 200 mm
Rotary Range	30 to 100°
Mounting	Linear or rotary actuators
Certifications	ATEX, IECEx, FM, CSA