4
57-657 SIL Certified Safety Manual for ECLIPSE Model 706
Safe Failure Fraction (SFF) for each subsystem in a safety
system (Type B–complex components as per IEC 61508
Part 2) of which the level transmitter is just one component.
3. All products chosen for use in the SIF must meet the
requirements of IEC 61508 for the given SIL Capability
level or be justified based on proven in use data collected for
each job.
The exSILentia tool from exida is recommended for design
verification. This automatically checks all three limits and
displays the results for any given design. The ECLIPSE
Model 706 is in the exSILentia database. This tool contains
all needed failure rate, failure mode, SIL Capability and
common cause data as well as suggested proof test methods.
2.0
Applicable Models
This manual is only applicable to the HART versions of
the ECLIPSE Model 706 transmitter shown in Table 1.
NOTE: Ensure that the Model 706 transmitter and probe are installed
as a set matched by the Serial Number shown on the name
plates.
3.0
Level Measuring System
The diagram at left shows the structure of a typical measuring
system incorporating the ECLIPSE Model 706 transmitter.
This SIL 2/3 Certified device is only available with an ana-
log signal (4–20 mA) with HART communications; and,
the measurement signal used by the logic solver can be the
analog 4–20 mA signal proportional to the Level, Interface
Level or Upper Layer Thickness.
• For fault monitoring, the logic unit must recognize both
high alarms (
≥
21.5 mA) and low alarms (
≤
3.6 mA).
• If the logic solver loop uses intrinsic safety barriers, caution
must be taken to ensure the loop continues to operate
properly under the low alarm condition.
• The only unsafe mode is when the unit is reading an
incorrect level within the 4–20 mA range (> ±2% deviation).
• MAGNETROL defines the faulted mode as one in which
the 4–20 mA current is driven out of range (i.e., less than
3.8 mA or greater than 21.5 mA).
• Volume and flow are not included in the safety function
for the ECLIPSE Model 706.
• The 4–20 mA output signal can be configured for over-
range per NAMUR NE43.
Actuator
PACTware
™
with
Eclipse
®
DTM
HART Modem
Eclipse
®
Model 706
Logic
Unit
