Orion Instruments Eclipse 705-51AX-XXX SIL Certified Safety Manual - Manual (Page 5)

5 57-651 Eclipse ® SIL Certified Safety Manual for Enhanced Model 705-51AX-XXX
2.2 Miscellaneous Electrical Considerations
The following are miscellaneous electrical issues that must
be considered in any installation:
2.2.1 Pollution Degree 2
The Enhanced ECLIPSE Model 705 is designed for use in
Category II, Pollution Degree 2 installations.
The usual pollution degree used for equipment being evalu-
ated to IEC/EN 61010 is a nonconductive pollution of the
sort where occasionally a temporary conductivity caused by
condensation is expected.
2.2.2 Overvoltage
The Enhanced ECLIPSE Model 705 has over-voltage protec-
tion per the necessary CE requirements. As this protection is
up to 1KV when considering Hi-pot, Fast Transients and
Surge, no unsafe failure modes should exist up to this potential.
Overvoltage Category II is a local standard, covering appli-
ances, portable equipment, etc., with smaller transient volt-
ages than those characteristic of Overvoltage Category III.
(This category applies from the wall plug to the power-sup-
ply isolation barrier or transformer).
The typical industrial plant environment is Overvoltage
Category II, therefore, most equipment evaluated to the
requirements of IEC/EN 61010 is considered to belong in
this classification.
3.0 Mean Time To Repair (MTTR)
SIL determinations are based on a number of factors,
including the Mean Time To Repair (MTTR). The analysis
for the Enhanced ECLIPSE Model 705 is based on a
MTTR of 24 hours.
4.0 Supplemental Documentation
The Enhanced ECLIPSE Model 705 Installation and
Operating Manual (57-600) must be available and used for
installation of the level transmitter.
If the HART digital protocol will be used, the following
Electronic Device Description Files are also required:
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.