Safety Function - Siemens DS III PROFIsafe Series Product Information

Device-specific safety instructions

3.2 Safety function

Level
The gauge pressure or differential pressure version measures the level of corrosive, non-
corrosive and hazardous liquids with the help of appropriate parameterization.
Wetted parts are made from different materials depending on the required corrosion
resistance.
Flow
The differential pressure version measures the flow rate of corrosive, non-corrosive and
hazardous liquids with the help of appropriate parameterization.
Wetted parts are made from different materials depending on the required corrosion
resistance.
Absolute pressure
These versions measure the absolute pressure of corrosive, non-corrosive and hazardous
gases, vapors and liquids.
Requirements
These pressure transmitters meet the following requirements:
• Functional safety to SIL 2 under IEC 61508 or IEC 61511-1, from firmware version FW:
• Explosion protection for corresponding versions
• Electromagnetic compatibility in compliance with EN 61326
3.2 Safety function
Safety function for pressure transmitters
Measuring pressures is the safety function for SITRANS P. The pressure is converted to a
digital measured value and transmitted by PROFIsafe communication. The measured value
has an accuracy of ±2%. It is transmitted together with the status information "Validity" and
"Quality". The safety function ensures that the diagnostic functions respond and signal an
invalid measured value within 60 seconds in the worst case scenario.
3-2
from 301.02.01K
Functional safety for SITRANS P, series DS III PROFIsafe
Product information, 07/2006, A5E00849297-01