Device-specific safety instructions
3.6 Safety characteristics
Functional safety for SITRANS P, series DS III PROFIsafe
Product information, 07/2006, A5E00849297-01
3-5
Checking safety
You should regularly check the safety function of the entire safety circuit in line with IEC
61508/61511. The testing intervals are determined during the calculation for each individual
safety circuit in a system (PFD
AVG
).
Electronics
The safety function of the transmitter is ensured only with the electronics delivered by the
factory. It cannot be replaced.
3.6
Safety characteristics
The safety characteristics necessary for using the system are listed in the "SIL declaration of
conformity". These values apply under the following conditions:
•
The SITRANS P pressure transmitter is only used in applications with a low demand rate
for the safety function (low demand mode).
•
The safety-related parameters/settings have been entered by local operation or
PROFIBUS communication before commencing safety-instrumented operation. They are
checked on the local display.
(see "Settings" section)
•
The safety function test is concluded successfully.
•
The transmitter is blocked against unwanted and unauthorized changes/operation.
•
The measured values transmitted with PROFIsafe are evaluated by a secure system.
•
The calculation of fault rates is based on a MTTR of 8 hours.
See also
Settings (Page 3-3)
SIL Declaration of Conformity (Page A-2)
