WIKA IS-3 Suplemento Del Manual De Instrucciones página 3

1. Applications / 2. Data for functional safety
1. Applications
The pressure transmitter model IS-3 with measuring range ≤ 1,000 bar is suitable for SIL2 applications
in process industry for operating modes with low demand rate.
MTTF values for defining the performance level (PL) are available for applications in machine building.
d
2. Data for functional safety
Data for functional safety in the process industry
Applied standards
Device type
HFT, Hardware Fault Tolerance
SFF, Safe Failure Fraction
λ , Total Failure Rate
total
λ , No Effect Failure Rate
NE
λ , Safe Undetected Failure Rate
SU
λ , Dangerous Detected Failure Rate
DD
λ , Dangerous Undetected Failure Rate
DU
PFD , Average Probability of Failure on Demand 1.75 x 10
a
T , Proof Test Intervall
proof
Suitable for Safety Integrity Level
Data for functional safety in machine building
Applied standards
MTTF , Mean Time To Dangerous Failure
d
Diagnosis
Addition to the operating instructions, model IS-3
EN 61508-2:2010 and EN 61511:2004; SN29500
B
0
64 %
126 FIT
8 FIT
27 FIT (consider the measured error within -3.5 ... +10 %)
51 FIT (loop current < 3.8 mA or > 20.5 mA)
40 FIT (measured error outside of -3.5 ... +10 %, loop current within
3.8 ... 20.5 mA)
-4
1 year, Test to discover a signal drift: Deviation from zero point and
full scale value < 0.5 % of the nominal pressure
SIL 2 (per IEC 61511-1:2003 section 11.4.4, involving prior use, no
diagnosis for active error detection implemented in the device)
ISO 13849-1:2008; SN29500
1254 years
none (test to discover a signal drift: Deviation from zero point and
full scale value < 0.5 % of the nominal pressure in a time interval of
max. 12 months)
EN
3