Endress+Hauser Liquiphant S FDL60 Instructions for use

SD175F/00/EN/09.09
71103335
Functional Safety Manual
Liquiphant S, Nivotester
FDL60/61, FTL670
Level limit measuring system
FTL670
s
Application
Overfill protection or maximum detection of all types of
liquids, to meet the particular requirements for safety-
related systems as per IEC 61508.
The measuring system meets the requirements for
• Functional safety in accordance with IEC 61508
• Explosion protection by intrinsic safety
• Electromagnetic compatibility as per EN 61326 and
NAMUR recommendation NE 21
• Electrical safety in accordance with IEC/EN 61010-1
Your benefits
• For overfill protection up to SIL 3
– independently assessed (Functional Safety
Assessment) by TÜV Süd in accordance with
IEC 61508
• Suitable for liquefied gases according to VdTÜV,
Merkblatt 100
– for tank categories B and C
– no annual recurrent test required
• Permanent self-monitoring
• Error message for circuit break and short-circuit
• 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, Nivotester
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Table of contents
SIL Declaration of Conformity . . . . . . . . . . . . . . . . . . . 3
General information . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Measuring system design. . . . . . . . . . . . . . . . . . . . . . . 4
System components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Description of use as a protective system . . . . . . . . . . . . . . . . . . . . 4
Permitted device types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Supplementary device documentation . . . . . . . . . . . . . . . . . . . . . . 6
Description of the safety requirements
and boundary conditions . . . . . . . . . . . . . . . . . . . . . . . 7
Safety function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Restrictions for use in safety-related applications . . . . . . . . . . . . . . 7
Functional safety figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Behavior of device during operation and in case of error . . . . . . . . 9
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Initial operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Proof-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Proof-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Procedure for proof-testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Commissioning or proof-test protocol . . . . . . . . . . . . . . . . . . . . . 15
Technical report . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Liquiphant S, Nivotester
Endress+Hauser 3
SIL Declaration of Conformity
SIL-03013b

Liquiphant S, Nivotester
4Endress+Hauser
General information
!Note!
General information on functional safety (SIL) is available at:
www.de.endress.com/SIL (German) or www.endress.com/SIL (English) and in the Competence Brochure
CP002Z "Functional Safety in the Process Industry - Risk Reduction with Safety Instrumented Systems".
Measuring system design
System components The measuring system's devices are displayed in the following diagram.
SD175en02
The measuring system consists of the Liquiphant S FDL60 or FDL61 sensor with the FEL67 electronic insert
and Nivotester FTL670 switching unit.
A signal which is dependent on the level is generated in the sensor. This is fed to the switching unit where it
is made available as a fail-safe contact.
Description of use as a
protective system
The tuning fork of the sensor vibrates at its intrinsic resonance frequency. The frequency decreases if the fork
is submersed in liquid. This change in frequency causes the fail-safe contact to change.
The switch point depends on installation. For information on the switch point, please refer to the Operating
Instructions (→ä6, "Supplementary device documentation").
SD175en03
1. Installation from above
2. Installation from the side
"Caution!
The measuring line only works in the overfill protection safety function (MAX safety) using the fail-safe contact!
The fail-safe contact always works in idle current safety; i.e. the contact opens when:
• The switch point is exceeded (level exceeds response height)
• A fault occurs
• The mains voltage fails
FTL670
s
Nivotester
FTL670
Cover
Electronic insert
FEL67
Liquiphant S
(FailSafe)
s*
1. 2.
approx. 5 mm

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In addition to the fail-safe contact, the fault-signalling contact (alarm relay) works as a changeover contact and
goes to idle condition when:
• One of the following faults occurs:
– Fault in the sensor FDL60, FDL61 (e.g. corrosion, electronics fault)
– Fault in data transfer
– Fault in FTL670 limit switch
• The mains voltage fails
!Note!
When the alarm relay changes to idle condition, the fail-safe contact also opens.
!Note!
Correct installation is essential to the safe operation of the device.
The instructions on installation conditions in the Operating Instructions (→ä6, "Supplementary device
documentation") must be followed.
Permitted device types The functional safety assessment described in this manual applies to the device versions listed below.
Unless otherwise indicated, all subsequent versions can also be used for safety functions.
In the event of device modifications, a modification process compliant with IEC 61508 is applied.
Device versions valid for use in safety-related applications:
Nivotester FTL670
The device version is suitable for use in safety-related applications.
Liquiphant S FDL60
Options Designation Version
010 Approval all
020 Process Connection all
025 Fork Surface Finish all
040 Electronics; Output all
050 Housing; Cable Entry all
Liquiphant S FDL61
Options Designation Version
010 Approval all
020 Process Connection all
025 Fork Surface Finish all
030 Probe Length all
040 Electronics; Output all
050 Housing; Cable Entry all