WIKA IS-21-S - Manual (Page 2)

11522977.03 GB/D/F/E 03/2010
2 WIKA Additional instructions Safety related data Intrnsically Safe Pressure Transmitter IS-2X
11522977.03 GB/D/F/E 03/2010
3 WIKA Additional instructions Safety related data Intrnsically Safe Pressure Transmitter IS-2X
Data for functional safety in the process industry
Applied standards EN 61508:2001 and EN 61511:2004; SN29500
Device type B
HFT Hardware Fault Tolerance 0
SFF Safe Failure Fraction % 62
l
total
Total Failure Rate FIT 101
l
no effect Safe Undetected Failure Rate FIT 30
l
LOW Safe Detected Failure Rate FIT 23
l
HIGH
Safe Detected Failure Rate FIT 10
 l
DU Dangerous Undetected Failure Rate FIT 38
PFD a Average Probability of Failure on Demand 1.66 x 10-4
T proof Proof Test Intervall years 1
Suitable for Safety Integrity Level
SIL 2
(according to IEC 61511-1 section 11.4.4 under conside-
ration of proven in use)
Data for functional safety in machine building
Applied standards ISO 13849-1:2006; SN29500
MTTF d Mean Time To Dangerous Failure years 1938
Applications / Data for functional safety GB
Applications
The pressure transmitter models IS-20-S, IS-21-S, IS-20-F and IS-21-F are suitable for
SIL2 applications in process industry for operating modes with low demand rate.
MTTF
d values for defining the performance level (PL) are available for applications in machine
building.
Data for functional safety
Operating conditions for process industry / Operating conditions for machine building GB
All values apply at mean ambient temperature of max. 40 °C.
The pressure transmitters are suitable for SIL2 applications assuming that the sensors
contribute approx. 35 % of the PFD
a
of the whole safety chain.
The environment of the pressure transmitter must comply with the following criteria:
„ no damage to the pressure transmitter housing
„ electromagnetic environment in accordance with EN 61326-1:2006 and EN 61326-2-3:2006
„ use of a shielded cable grounded at least at one end
The following assumptions were made for a fail-safe operation of the pressure transmitter:
„ the maximum measurement error may range from -2.5 % to 10 % of the span
„ the process connection is suitable for the measuring range
„ wetted parts are suitable for the medium
„ no pressure peaks nor static pressures are higher than the values indicated in the data
sheet
Operating conditions for the process industry
The MTTF d value applies at a mean ambient temperature of max. 40 °C.
The MTTF
d
value also applies to the following operating conditions:
„ no strong vibrations
„ no damage to the pressure transmitter housing
„ electromagnetic environment in accordance with EN 61326-1:2006, EN 61326-2-3:2006
and EN 61326-3-1:2008
„ the process connection is suitable for the measuring range
„ wetted parts are suitable for the medium
„ no pressure peaks nor static overpressures are higher than the values indicated in the data
sheet
Operating conditions for machine building