5
57-650 Eclipse
®
SIL Functional Safety Manual
2.2.2 Overvoltage
The MAGNETROL Model 705 has over-voltage protection
per CE requirements. When considering Hi-pot, Fast
Transients and Surge, this protection is to 1000 volts.
Therefore, there should be no unsafe failure modes up to 1 KV.
Overvoltage Category II is a local level, covering appliances,
portable equipment, etc., with smaller transient overvoltages
than those characteristic of Overvoltage Category III. This
category applies from the wall plug to the power-supply iso-
lation barrier (transformer). The typical plant environment
is Overvoltage Category II, so most equipment evaluated to
the requirements of IEC/EN 61010 are considered to
belong in that classification.
3.0 Mean Time To Repair (MTTR)
SIL determinations are based on a number of factors includ-
ing the Mean Time To Repair (MTTR). The analysis for the
Enhanced Model 705 is based on a MTTR of 8 hours
4.0 Supplementary Documentation
The ECLIPSE Enhanced Model 705 Installation and
Operating Manual Bulletin 57-600 must be available for
installation of the measuring system.
One of the following Electronic Device Description Files is
also required if HART is used:
Manufacturer Code 0x56
Model 705 3.x Device ID 0xE5, device revision 1,
DD revision 1.
For device installations in a classified area, the relevant safety
instructions and electrical codes must be followed.
5.0 Instructions
5.1 Systematic Limitations
The following must be observed to avoid systematic failures.
5.1.1 Application
Choosing the proper Guided Wave Radar (GWR) probe is
the most important decision in the application process. The
probe configuration establishes fundamental performance
characteristics. Coaxial, twin element (rod or cable), and single
element (rod or cable) are the three basic configurations.
The probe for use with the ECLIPSE Enhanced Model 705
should be selected as appropriate for the application.
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