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Siemens AG
3
Device-specific safety instructions
3.1
Applications
The Hardware assessment of the ULTRAMAT 6 shall provide the safety
instrumentation engineer with the required failure data as per IEC 61508 / IEC
61511 and does not include an assessment of software.
The hardware of ULTRAMAT 6 satisfies the special requirements in terms of
functional safety to SIL 1 in accordance with IEC 61508 or IEC 61511-1.
The ULTRAMAT 6 is usable in safety applications to monitor limits.
3.2
Safety function
The ULTRAMAT 6 is mainly used for user defined threshold monitoring. Only
the analog output 4...20 mA (NAMUR) was calculated as safety function. The
dangerous failure is a deviation of the output current of ±5% full span.
Warning
The binding settings and conditions are listed in the "Settings" and "Safety
characteristics" sections. These conditions must be met in order to fulfil the
safety function.
When the safety function has been executed, safety-instrumented systems
with no self locking function should be brought to a monitored or otherwise
safe status within the Mean Time To Repair (MTTR). The MTTR is 8 hours.
The calculated Mean Time Between Failure (MTBF) for ULTRAMAT 6 is 50
years.
Reference
Instruction manual ULTRAMAT 6 E/F, OXYMAT 6E/F (Order number see
chapter 1.3)
See also
Settings (Chapter 3-3)
Safety characteristics (Chapter 3-6)
9 of 19
SIL Safety Manual ULTRAMAT 6 Gas analyzers
A5E00729183-02
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