gefran ILI Series Original Operating Instructions page 28

9. FUNCTIONAL SAFETY NOTES (FOR SIL 2 / PL D CERTIFIED VERSIONS ONLY) -WAITING FOR
9.1. Application
The pressure sensors ILI SIL 2 / PL d perform the following safety function:
The safety function performed by the sensor is the correct measurement and transduction of pressure value, read according to
accuracy specification defined in the datasheet and in this user manual, to be compared with a determined safety threshold (high
threshold), or de-energizing of a relay contact normally energized, at the overcoming of a set safety threshold.
The designated category to which are limited the use of safety related parts is Category 2.
The SIL/PL parameters of the transducer are shown in the table below:
Table 12
Parameter
Architecture
HFT
Category
Factors β
β
β
D
λ
DD
Current output
Voltage output
λ
DU
Current output
Voltage output
SFF
Current output
Voltage output
PFH
Current output
Voltage output
Systematic capability
MTTF
DCavg
SIL
PL
Life time
In the evaluation three different failures have been excluded:
• Wearing/corrosion of the mechanical parts at the process front end [13849-2:2012 prospect A.4]
• Break of the mechanical parts at the process front end [13849-2:2012 prospect A.4]
• Plastic deformation due to excessive loads of the mechanical parts at the process front end [13849-2:2012 prospect A.4]
The pressure sensors of the ILI SIL 2 / PL d series can be part of a pressure detection system which, when a threshold value is
exceeded, deactivates all the pressure generation elements through the control system.
In following figures some possible applications are shown:
28
NOTIFIED BODY CERTIFICATION-
Value
1oo1
0
2
3
2
d
20
Measuring Unit
--
--
--
--
1/h
1/h
1/h
1/h
%
%
1/h
1/h
y
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