Instruction Manual Supplement
D104215X012
DLC3100 SIS Digital Level Controller
April 2018
7
SIL Capability
D Systematic Integrity
SIL 2 Capable – The DLC3100 SIS digital level controller has met manufacturer design process requirements of
IEC61508 Safety Integrity Level 2.
D Random Integrity
The DLC3100 SIS digital level controller is classified as a Type B device according to IEC61508. The complete
element subsystem will need to be evaluated to determine the SFF. If the SFF of the subsystem is > 90% and
the PFD
avg
< 10
-2
, the design can meet SIL2 @ HFT = 0. If the SFF of the subsystem is between 60% and 90%,
and the PFD
avg
< 10
-1
, the design can meet SIL1 @ HFT = 0.
Safety Function
The safety function of DLC3100 SIS digital level controller is to measure level or interface of fluids and transmit a
4-20 mA analog signal within the safety accuracy (measurement accuracy ±2%). It includes the whole hardware and
software measurement chain from the displacer through the torque tube and the electronic board to the primary
analog output signal.
Table 5. Normal and Alarm States for FIELDVUE DLC3100 SIS Digital Level Controller
Output Function Normal State Safety Accuracy Alarm State
(1)
4-20 mA
Level transmitter
Actual fluid level ±2% >21.0 mA or <3.6 mA
1. Configurable high or low. Values are per NAMUR NE43.
Failure Rates
The failure rate data listed in table 6 and 7 is valid for the 15-year useful lifetime of the DLC3100 SIS digital level
controller. Its useful lifetime is highly dependent on the subsystem itself and its operating conditions. The failure rate
will increase after this time period. Reliability calculations based on the data listed in the FMEDA report for mission
times beyond the useful lifetime may yield results that are too optimistic.
Table 6. Failure Rates for FIELDVUE DLC3100 SIS Digital Level Controller
Failure Category Failure Rate (FIT)
Fail Safe Detected, λ
SD
0
Fail Safe Undetected, λ
SU
0
Fail Dangerous Detected, λ
DD
463
Fail Detected (detected by internal diagnostics) 230
Fail High (detected by logic solver) 83
Fail Low (detected by logic solver) 150
Fail Dangerous Undetected, λ
DU
39
No Effect 186
Annunciation Detected 33
Annunciation Undetected 14
SFF 92.2%
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