Siemens SITRANS P Instruções de Operação Página 146

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Note
Use of remote seals
If remote seals are used, the application-specific measurement error is the product of the
transmitter and remote seal measurement errors.
WARNING
Disregarding conditions for fulfilling the safety function
Disregard
can result in a malfunction of the process plant or application, e.g. process pressure
too high, maximum level exceeded.
The binding settings and conditions are listed in the chapters "Settings (Page 145)" and
"Safety characteristics (Page 147)".
These conditions must be strictly observed in order to fulfill the safety function.
8.3.2 Requirements
Requirements
Functional safety has the following requirements:
Two
DS III devices are required for redundant operation in accordance with SIL 3. Operation
with one DS III is not permissible.
Functional safety up to SIL 3 in accordance with IEC 61508/IEC 61511-1. The firmware
version is listed in the "SIL Declaration of Conformity".
Explosion protection for corresponding versions
Electromagnetic compatibility in compliance with EN 61326
Description
The sensor, logic unit/control system and final controlling element combine to form a safety-
instrumented system, which executes a safety function. The focal point of this description is
the sensor. Please refer to the corresponding standards for the requirements placed on the
PLC and final controlling element.
Automation system
Transmitter
Final controlling elements
P$

P$
Figure 8-4 Safety-instrumented system in redundant operation
Functional safety
8.3 Device-specific safety information for redundant operation (SIL 3)
SITRANS P, DS III series with HART
144 Operating Instructions, 09/2012, A5E00047092-08
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