Siemens AG
13 of 19 SIL Safety Manual ULTRAMAT 6 Gas analyzers
A5E00729183-02
3.6 Safety characteristics
The safety characteristics necessary for use of the system are listed in the SIL
declaration of conformity (see chapter Appendix). These values apply under
the following conditions:
• The ULTRAMAT 6 is only used in safety-related systems with a low
demand mode for the safety function.
• The safety-related parameters/settings (see “Settings” section) have
been entered by local operation and checked before commencing
safety-instrumented operation.
• The ULTRAMAT 6 is blocked against unwanted and unauthorized
changes/ operation.
• The average temperature viewed over a long period is 40°C.
• All used materials are compatible with process conditions.
• The MTTR after a device fault is 8 hours.
• The best time to react on a dangerous detected failure is 1 hour.
• The logic solver (PLC) has to be configured to detect over range
(>21mA) and under range (<3.6mA) failure of the ULTRAMAT 6 (Fail
High and Fail Low) and will recognize these as internal failure of the
devices and not cause a spurious trip.
See also
Settings (Chapter 3-3)
SIL Declaration of Conformity (Chapter A.1)
To Next Page
Loading...
