Endress+Hauser Liquiphant S FDL60 Gebrauchsanweisung

SD175F/00/EN/09.09

71103335

Functional Safety Manual

Liquiphant S, Nivotester

FDL60/61, FTL670

Level limit measuring system

FTL670

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

2Endress+Hauser

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

Nivotester

FTL670

Cover

Electronic insert

FEL67

Liquiphant S

(FailSafe)

1. 2.

approx. 5 mm

Liquiphant S, Nivotester

Endress+Hauser 5

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

Liquiphant S, Nivotester

6Endress+Hauser

Supplementary device

documentation Liquiphant S FDL60, FDL61

Documentation Contents Note

Technical Information

TI223F/00

–Technicaldata

– Instructions on accessories

– The documentation is available on the

Internet.

→www.endress.com.

Operating Instructions

BA140F/00

–Introduction

– Mounting the Liquiphant S

– Mounting the Nivotester

– Connection

–Start-up

– Maintenance

– Trouble-Shooting

–TechnicalData

– Liquefied Gas: Special Instructions

– The documentation is available on the

Internet.

→www.endress.com.

Compact Instructions

KA030F/00

– Safety and Certificates

– Unpacking and Mounting

– Connection

– The documentation is supplied with

the device.

– The documentation is also available on

the Internet.

→www.endress.com.

Safety instructions

(depending on the selected

"Approval" version)

– Safety, mounting and operating

instructions for devices suitable for

use in hazardous areas or as overfill

protection (German Water

Resources Act).

Additional safety instructions (XA, XB,

XC, ZE, ZD) are supplied with certified

device versions.

Please refer to the nameplate for the

relevant safety instructions..

Nivotester FTL670

Documentation Contents Note

Technical Information

TI223F/00

–Technicaldata

– Instructions on accessories

– The documentation is available on the

Internet.

→www.endress.com.

Operating Instructions

BA140F/00

–Introduction

– Mounting the Liquiphant S

– Mounting the Nivotester

– Connection

–Start-up

– Maintenance

– Trouble-Shooting

–TechnicalData

– Liquefied Gas: Special Instructions

– The documentation is supplied with the

device.

– The documentation is also available on

the Internet.

→www.endress.com.

Compact Instructions

KA031F/00

– Safety and Certificates

– Connection

– Signalling

– The documentation is supplied with the

device.

– The documentation is also available on

the Internet.

→www.endress.com.

Safety instructions

(depending on the selected

"Approval" version)

– Safety, mounting and operating

instructions for devices suitable for

use in hazardous areas or as overfill

protection (German Water

Resources Act).

Additional safety instructions (XA, XB,

XC, ZE, ZD) are supplied with certified

device versions.

Please refer to the nameplate for the

relevant safety instructions..

Liquiphant S, Nivotester

Endress+Hauser 7

Description of the safety requirements

and boundary conditions

Safety function The safety function of the measuring system is maximum level limit monitoring (overfill protection).

Safety-related signal

The safety-related signal is the fail-safe contact:

• The fail-safe contact is closed in the operating state (tuning fork free).

• The fail-safe contact is opened (safe condition) on demand (tuning fork covered) or if a fault occurs.

Restrictions for use in safety-

related applications

The measuring system must be used correctly for the relevant application, taking into account the medium

properties and ambient conditions. The instructions for critical process situations and installation conditions,

as detailed in the Operating Instructions, must be observed.

The specifications in the Operating Instructions (→ä6, "Supplementary device documentation") must not be

exceeded.

Depending on the Nivotester density setting (→ä10, "Installation"), the density of the medium must not

undershoot specific limit values:

• Setting ρ> 0.7 (with jumper):

– All liquids of viscosity up to 2000 mm2/s with density greater than 0.7 g/cm3.

– Viscosities up to 10,000 mm2/s are possible in the case of orientations as per TI223F/00.

• Setting ρ> 0.5 (without jumper):

– All liquids of viscosity up to 2000 mm2/s with density greater than 0.5 g/cm3.

– Viscosities up to 10,000 mm2/s are possible in the case of orientations as per TI223F/00.

– Liquefied gas with density greater than 0.44 g/cm3.

Liquiphant S, Nivotester

8Endress+Hauser

Functional safety figures The table shows the specific figures for functional safety for Liquiphant S + FEL67 + Nivotester FTL670:

Dangerous undetected failures in this scenario:

A dangerous, undetected failure is defined as an incorrect output signal where the tuning fork is covered while

the fail-safe contact is closed.3

Useful lifetime of electrical components:

The established failure rates of electrical components apply within the useful lifetime as per IEC 61508-2,

Section 7.4.7.4. Note 3.

Figures

according to IEC 61508

Value

Liquiphant S + FEL67 Nivotester FTL670 Liquiphant S + FEL67

+ Nivotester FTL670

Safety function MAX Level

SIL 3

HFT 1

Device type B

Mode of operation Low demand mode, High demand mode

SFF 91.4 % 90.1 % 91 %

MTTR 8 h

Recommended

proof-test interval T1

15 years

λsd *2401.4 FIT 179.5 FIT

λsu *283.4 FIT 44.5 FIT

λdd *2401.4 FIT 179.5 FIT

λdu *283.4 FIT 44.5 FIT

λtot *2969.5 FIT 447.9 FIT 1417.4 FIT

β5 % 5 % -

βD2 % 2 % -

PFDavg for T1= 15 years *11.73 × 10-4 9.24 × 10-5 2.66 × 10-4

PFH for T1= 15 years *12.64 × 10-9 1.41 × 10-9 4.04 × 10-9

MTBF *3117 years 254 years 80 years

Diagnostic test interval *430 s

Fault reaction time *53 s

System reaction time *60.5 s with tuning fork covered

1.0 s with tuning fork uncovered

*1The values correspond to SIL 3 as per ISA S84.01.

*2According to Siemens SN29500.

*3According to Siemens SN29500, including faults outside of the safety function.

*4During this time, all diagnostic functions are executed at least once.

*5Time between fault detection and fault reaction.

*6Step response time as per DIN EN 61298-2.

Liquiphant S, Nivotester

Endress+Hauser 9

Behavior of device during

operation and in case of error

Behavior of device during power-up

Once a device has powered up, the output signal can be regarded as safe after 10 seconds.

The fail-safe contact is open during this time.

After this, the device is in normal operation and shows the status of the tuning fork (free/covered).

Behavior of device on demand

Once the level limit to be monitored is reached, the fail-safe contact changes from closed to open within the

system reaction time.

Behavior of device in the event of of faults

Fail-safe contact

The fail-safe contact is open in the event of faults.

Alarm relay

The alarm relay changes to idle condition in the event of faults.

The type of fault is also indicated by an LED on the Nivotester; see Operating Instructions (→ä6,

"Supplementary device documentation").

!Note!

This signaling is simply an additional piece of diagnostic information and does not form part of the safety-related

output signal.

Liquiphant S, Nivotester

10 Endress+Hauser

Installation Installation, wiring and commissioning

Installation, wiring and commissioning of the device is described in the Operating Instructions (→ä6,

"Supplementary device documentation").

SD175en04

* Overvoltage protector HAW560Z and HAW562Z if required

"Caution!

Note the following for Nivotester FTL670:

The operator must use suitable measures (e.g. current limiter, fuse) to ensure the following characteristics for

the fail-safe contact and alarm relay 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!

Orientation

The permitted orientations of the device are described in the Operating Instruction (→ä6, "Supplementary

device documentation").

dbz

4d4

12 z 12d12

14 z 14d14

18 d 18

d32L+

L–

z26

b28

20 b 20

z32

d26

U_20...30 V

HAW *

Liquiphant S

FDL60, FDL61

Nivotester

FTL670

–+

FEL67

Explosion hazardous area

Density setting

Safety contact

Power supply

Stop filling

Test (Reset)

Fault indication

without jumper

rgreater than

0.5 and with

liquefied gas

rgreater than

0.7

with jumper

Safe area

Alarm relay

Signal line

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