1. No category

Safety Manual
SD 175F/00/en/11.03
52021926
Level limit measuring system
liquiphant S FDL 60, FDL 61 +
nivotester FTL 670
Functional safety manual
FTL 670
s
Application
Overfill protection or operating maximum
detection of all types of liquids in tanks to
satisfy particular safety systems
requirements to IEC 61508.
The measuring device fulfils the
requirements concerning
• Safety functions up to SIL 3
• Explosion protection through intrinsic
safety
• EMC to EN 61326 and NAMUR
Recommendation NE 21.
Your benefits
• For overfill protection up to SIL 3
– Independently assessed
(Functional Assessment) by
TÜV SÜDDEUTSCHLAND to
IEC 61508
• Suitable for pressure vessels with
liquefied gases according to VdTÜV,
Merkblatt 100
– For tank categories B and C
– No annual recurrent test required
• Permanent self-monitoring
• Fault message for line break and shortcircuit
• Functional test of follow-up devices
with press of button or remote
operation
• Monitoring for corrosion on the tuning
fork of the sensor
• No calibration
• Insensitive to external vibration
• Easy commissioning
Liquiphant S FDL 60/61 + Nivotester FTL 670 (FailSafe)
Table of contents
SIL declaration of conformity. . . . . . . . . . . . . . . . . . 3
Validity of the Safety Manual . . . . . . . . . . . . . . . . . . 4
Valid device versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Abbreviations, standards and terms . . . . . . . . . . . . . . . . . . 5
Determining the Safety Integrity Level (SIL) . . . . . . . . . . . . 5
Safety function with Liquiphant S FDL 60/61
and Nivotester FTL 670 . . . . . . . . . . . . . . . . . . . . . . 7
Structure of the level limit measuring system . . . . . . . . . . . 7
Permitted combinations for the safety function . . . . . . . . . . 8
Supplementary device documentation . . . . . . . . . . . . . . . . 8
Settings and installation instructions . . . . . . . . . . . 9
Installation instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Recurrent test for SIL 3 to IEC 61508 . . . . . . . . . . . 9
..............................................9
Response in operation and failure . . . . . . . . . . . . . 9
..............................................9
Technical safety characteristic quantities . . . . . . 10
Specific technical safety characteristic quantities
and wiring options for the Liquiphant S FDL 60/61
+ Nivotester FTL 670 measuring system . . . . . . . . . . . . . 10
TÜV SÜDDEUTSCHLAND . . . . . . . . . . . . . . . . . . . . 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2
Endress + Hauser
Liquiphant S FDL 60/61 + Nivotester FTL 670 (FailSafe)
SIL declaration of conformity
L0 0-FDL6 xxxx-01- 06- xx-a2- 000
Endress + Hauser
3
Liquiphant S FDL 60/61 + Nivotester FTL 670 (FailSafe)
Validity of the Safety Manual
Valid device versions
The evaluation described in this Safety Manual regarding functional safety is valid for the device
versions and software versions specified below.
Unless otherwise stated, all of the following versions can also be used for safety functions
because they are subject to the internal modification process, within which the effects of
modifications regarding functional safety are also evaluated.
The valid device versions are:
• Liquiphant S FDL60 - # ### # 7 #
• Liquiphant S FDL61 - # ### # # 7 #
in conjunction with Nivotester FTL 670.
4
Endress + Hauser
Liquiphant S FDL 60/61 + Nivotester FTL 670 (FailSafe)
Introduction
Abbreviations, standards
and terms
Abbreviations
Information on abbreviations in connection with functional safety and their explanations can be
found in the E+H brochure "Functional safety in the Process Industry - reducing risks with SIL"
(SI 002Z) under www.endress.com/sil.
Relevant standards
Standard
English
IEC 61508,
Part 1 - 7
Functional safety of electrical/electronic/programmable electronic safety-related
systems (Target group: Manufacturers and Suppliers of Devices)
IEC 61511,
Part 1 - 3
Functional safety - Safety Instrumented Systems for the process industry sector
(Target group: Safety Instrumented Systems Designers, Integrators and Users)
Terms
Term
Determining the
Safety Integrity Level (SIL)
Explanation
Dangerous failure
Failure with the potential to put the safety-related system in a dangerous or
non-functional condition.
Safety-related system
A safety-related system performs the safety functions that are required to
achieve or maintain a safe condition e.g. in a plant. Example: sensor with
switching amplifier (e.g. level switch), logic unit (e.g. PLC) and actuator
(e.g. valve) form a safety-related system.
Safety function
Defined function, which is performed by a safety-related system with the aim of
achieving or maintaining a safe condition for the plant, considering a specified
dangerous incident. Example: limit level monitoring
The achievable Safety Integrity Level is determined by the following technical safety
characteristic quantities:
• Average probability of Failure on Demand (PFDav )
• Hardware Fault Tolerance (HFT) and
• Safe Failure Fraction (SFF).
The specific technical safety characteristic quantities for the Liquiphant S
FDL 60/61 + Nivotester FTL 670 measuring system are listed in the "Technical safety
characteristic quantities" chapter.
The following table displays the dependence of the "Safety Integrity Level" (SIL) on the
"Average probability of Failure on Demand" (PFDav). Here, the "Low demand mode" has been
observed, i.e. the requirement rate for the safety-related system is on average once a year.
Safety Integrity Level (SIL)
4
Endress + Hauser
PFD av (Low demand mode)
≥ 10-5...< 10-4
3
33
≥
≥10 -4...< 10 - 33
≥≥
2
≥ 10-3 ...< 10-2
1
≥ 10-2 ...< 10-1
5
Liquiphant S FDL 60/61 + Nivotester FTL 670 (FailSafe)
Sensor, logic unit and actuator together form a safety-related system, which performs a safety
function. The "Average probability of Failure on Demand" (PFDav) is usually divided up into the
sensor, logic unit and actuator sub-systems as per Figure 1.
Logic Unit
(e.g. PLC)
Sensor
(e.g. Level Limit
Measuring System)
PFDav
≤ 35 %
Actuator
(e.g. Valve)
≤ 15 %
≤ 50 %
= 100 %
L00 -FTL xxxxx-05- 06- xx-en- 000
Fig. 1: usual division of the "Average probability of Failure on Demand" (PFDav ) into the sub-systems
!
Note!
This documentation considers Liquiphant S FDL 60/61 + Nivotester FTL 670 as components of a
safety function.
The following table displays the achievable "Safety Integrity Level" (SIL) of the entire safety-related
system for type B systems depending on the "Safe Failure Fraction" (SFF) and the "Hardware Fault
Tolerance" (HFT). Type B systems are, for example, sensors with complex components such as
microprocessors (→see also IEC 61508, Part 2).
Safe Failure Fraction
(SFF)
< 60 %
Hardware Fault Tolerance (HFT)
0
1
2
not permitted
SIL 1
SIL 2
60 ...< 90%
SIL 1
SIL 2
SIL 3
90 ...< 99%
SIL 2
SIL 3
-
≥ 99 %
SIL 3
-
-
For Liquiphant S FDL 60/61 + Nivotester FTL 670, the HFT-value 1 applies.
The Safe Failure Fraction (SFF) is in the range of 90...< 99 %.
6
Endress + Hauser
Liquiphant S FDL 60/61 + Nivotester FTL 670 (FailSafe)
Safety function with Liquiphant S FDL 60/61
and Nivotester FTL 670
Structure of the level limit
measuring system
The measuring system's devices are displayed in the following diagram.
Cover
FEL 67
Electronic insert
FTL 670
Liquiphant S (FailSafe)
s
Nivotester
FTL 670
L 00-F DL xxxxx-16- 06- xx-en- 000
Liquiphant S
FDL 60/61 with FEL 67 and Nivotester FTL 670
Safety function
The measuring line only works in the overfill protection safety function (MAX safety) using the level
relay.
The level relay always works in quiescent current safety; i.e. the relay contact opens when:
• The switch point is exceeded (level exceeds response height)
• A fault occurs
• The mains voltage fails
In addition to the level relay, the fault-signalling contact (alarm relay) works in quiescent current
safety and opens when:
• One of the following faults occurs:
– Fault in the sensor FDL 60, FDL 61 (e.g. corrosion, electronics error)
– Fault in data transfer
– Fault in FTL 670 limit switch
• The mains voltage fails
!
Endress + Hauser
Note!
When the alarm relay opens, the level relay also opens.
7
Liquiphant S FDL 60/61 + Nivotester FTL 670 (FailSafe)
Permitted combinations
for the safety function
The following combinations are permitted for the measuring system:
Nivotester
Liquiphant S FDL 60/61 + FEL 67
FTL 670
Order number:
016501-0040
FDL 60-# ### # 7 #*
FDL 61-# ### # # 7 #*
Permitted instrument types (# = all instrument versions permitted); * 7 = FEL 67
Safety function data
The safety function is guaranteed by the:
• Redundant design of all the important electronic components in the Liquiphant S sensor with
FEL 67
• Redundant design of all the important electronic components in the Nivotester switching unit
• Interference-free PFM- signal transmission
The measuring system reacts as follows:
– Approx. 0.5 s when the tuning fork is covered
– Approx. 1.0 s when the tuning fork is exposed
– When an error occurs: max. 3.0 s safety time
!
Supplementary device
documentation
Note!
MTTR (Mean Time To Repair) is set at 8 hours.
Safety systems without a self-locking function must be monitored or set to an otherwise safe
state after carrying out the safety function within MTTR.
Depending on the version, the following documentation must be available for the measuring
system:
Devices
"
8
Technical Information
Operating Instructions,
Compact Instructions
(TI + BA + KA)
Explosion protection /
certificate
Other documentation
(XA, ZE or ZD)
Liquiphant S
TI 223F, BA 140F;
FDL 60/61 +
KA 031F
Nivotester FTL 670
Functional safety AK5
TÜV (Product Service)
Liquiphant S
FDL 60, FDL 61
TI 223F, BA 140F;
Overfill protection for liquefied
gas
Safety Instructions
ZE 126F
Liquiphant S
FDL 60, FDL 61
TI 223F, BA 140F;
ATEX II 1/2 G
EEx ia IIC T6
Safety Instructions
XA 027F
Nivotester FTL 670 TI 223F, BA 140F;
KA 031F
ATEX II (1) G
EEx [ia IIC]
Safety Instructions
XA 069F
None
Liquiphant S
TI 223F, BA 140F;
FDL 60/61 +
KA 031F
Nivotester FTL 670
Standard
None
Caution!
The installation and setting instructions, and the technical limit values must be observed in
accordance with the Operating Instructions (BA 140F).
For devices used in explosion-hazardous areas, the additional documentation (XA, ZE) in
accordance with the table must also be observed.
Endress + Hauser
Liquiphant S FDL 60/61 + Nivotester FTL 670 (FailSafe)
Settings and installation instructions
Installation instructions
Since the application conditions have an effect on the safety of the measurement, please refer to
the applicable device documentation for information regarding the correct installation of the
Liquiphant S FDL 60/61 + Nivotester FTL 670.
The following settings are permitted for the safety function:
Instrument
Setting
Liquiphant S
FDL 60/61
with FEL 67
No settings possible.
---
Nivotester
FTL 670
Setting for product density:
ρ > 0.50* (without jumper)
ρ > 0.70 (with jumper)
As-deliver ed state
ρ > 0.50* (without jumper)
*also suitable for liquefied gas ρ > 0.44 .
"
"
Caution!
Observe the following for the Nivotester FTL 670: The operator must use suitable measures
(e.g. current limiter, fuse) to ensure the relay contact characteristics are not exceeded:
• U ≤ 230 V AC 50/60 Hz , I ≤ 2.5 A,
P ≤ 600 VA at cos ϕ = 1.0 or P ≤ 300 VA at cos ϕ ≥ 0.7 or
• U ≤ 120 V DC, I ≤ 2.5 A, P ≤ 75 W
Caution!
Changes to the measuring system and settings after start-up can impair the protection function!
Recurrent test for SIL 3 to IEC 61508
The operativeness of the measuring system must be checked every five years if the PFD av values
given in the Appendix are used.
This is required to avoid a small remaining risk which can never be ruled out for any safety-related
function.
Response in operation and failure
!
Endress + Hauser
Note!
The behaviour in operation and failure is described in the Operating Instructions BA 140F.
9
Liquiphant S FDL 60/61 + Nivotester FTL 670 (FailSafe)
Technical safety characteristic quantities
Specific technical safety
characteristic quantities
and wiring options for the
Liquiphant S FDL 60/61 +
Nivotester FTL 670
measuring system
The tables show the specific values and wiring options for the measuring system.
Note!
Note the following points on the tables below:
• The wiring scheme shows the number of instruments (Liquiphant and Nivotester) and the limit
relay contact circuits (open, when the sensor signals covering).
1oo1 architecture (1 out of 1)
Liquiphant S FDL 60/61
Settings
None
Nivotester FTL 670
Settings
Density 0.44 / 0.7
SIL
SIL 3
HFT
1
SFF
> 90 %
PFD av **
2.4 x 10-4
Recurrent test
e.g. approaching level
** TI (test interval) = every five years
The PFD av of 2.4x10 -4 applies provided that the measuring line is tested every five years by
approaching the liquid level.
10
Endress + Hauser
Liquiphant S FDL 60/61 + Nivotester FTL 670 (FailSafe)
TÜV SÜDDEUTSCHLAND
L00- FDL6xxxx-0 1-06 -xx-xx- 002
L00- FDL6xxxx-0 1-06 -xx-xx- 001
Endress + Hauser
11
Liquiphant S FDL 60/61 + Nivotester FTL 670 (FailSafe)
Deutschland
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08.02
SD 175F/00/en/11.03
52021926
FM+SGML 6.0 ProMoDo
52021926