User Manual

Commissioning
Part No.: 4417.762_Rev07 SmartRadar FlexLine
Service Manual 6 - 91
6.6.11 Overfill Protection Application
6.6.11.1 Introduction
Because of some tank storage overfill accidents in the past, there is an
increased need for a qualified overfill-protected level measuring system.
The SmartRadar FlexLine can be configured such that an adequate
overfill protection level is achieved. As such it is qualified as a Safety
Instrumented Function (SIF) for overfill protection of storage tanks in the
oil and gas industry, to a SIL
1
2 level.
The safety parameters are within the range of SIL 2 if the following
conditions are met:
 The SmartRadar FlexLine uses the Overfill Protection Appli-
cation with the dual redundant configuration of the FII-DO as
described in this manual, and
 All relevant entities are commissioned as decribed in this
manual.
6.6.11.2 Essential FlexConn Boards
The essential FlexConn boards for an overfill protection application are:
 FII-DO (1)
 FII-DO (2)
 TII-XR
 PSX
6.6.11.3 Application Principle
 In order to achieve the correct SIL, 2 SmartRadar FII-DO modules
are combined into a special safety configuration.
 For this special configuration, only relay 3 and relay 4 are used.
For their locations, see FIGURE 6-22.
ESF10-0001
FIGURE 6-22 Locations and ratings of the Electro Mechanical Relays on the FII-DO board
1. SIL = Safety Integrity Level.
relay 3
relay 2
relay 1
relay 4
125 VAC / 0.5 A
(ca. 110 VDC / 0.3 A)
250 VAC / 3 A
(ca. 40 VDC / 3 A)
250 VAC / 3 A
(ca. 40 VDC / 3 A)
125 VAC / 0.5 A
(ca. 110 VDC / 0.3 A)