The Liquiphant Family - Endress+Hauser Ireland

The Liquiphant Family
Level limit detection in liquids
using the vibration principle

Convincing...
Analysis electronics
Detection of
frequency shift
The original and best
When Endress+Hauser invented the vibration
principle 20 years ago it paved the way
to safe and reliable level monitoring. The
Liquiphant soon became a classic. More
than 2 million measuring points worldwide
emphasise Endress+Hauser’s competence in
liquid media limit detection.
Quality and safety are synonymous with
Endress+Hauser instrumentation. The latest
simulation and manufacturing procedures
are used from development through to
production in order to meet requirements.
Endress+Hauser is a family-owned company
with over 6,700 employees, serving
customers in 37 countries worldwide. The
international solution provider has offered a
large range of products and services for all
process automation sectors for more than
50 years.
Functional principle
Limit switches using the vibration principle
are used in process automation applications
everywhere. What is the reason for this
success? Vibration limit switches operate
safely and are technically so mature that they
may be tailored exactly to user requirements.
A sensor in form of a tuning fork is exited
to its resonant frequency by a piezoelectric
drive. The frequency changes as liquid
covers the fork. This change is analysed
and converted into a switching signal.
The instruments of the Liquiphant family
monitor level limits of all liquids in tanks,
vessels and pipes. Applications are
wideranging and cover simple operational level
limit detection (minimum and maxi mum
monitoring) and WHG 1 -certifi ed leakage
monitoring or overspill protection through
to protective facilities in plant parts subject
to Disturbance Regulations.
1
WHG (Wasserhaushaltsgesetz) – German Water
Preservation Act
Resonant circle
• Frequency
shift upon
immersion
into the media
• Associated
mass increases
Bimorph and stack drive –
the heart of Liquiphant
A combination of
mechanics and electronics
(mechatronics) – tried and
tested level limit detection
Benefits:
• Liquiphant – the instrument for all level
limit applications
• Endress+Hauser - your reliable process
automation partner
2

For universal use across the process
industries
A distinct advantage of the vibration principle
is its mode of operation. Level limits are
detected almost unaffected by the physical
properties of the medium, e.g. conductivity,
dielectric constant, viscosity, changes in
density, pressure or temperature. In addition,
turbulence, foam or bubbling liquids do not
impair the operation either. These unique
performance features permit the instruments
of the Liquiphant family to be employed in
all process engineering sectors. The most
important industries are:
• Chemicals/petrochemicals
• Pharmaceuticals
• Food
• Environment
• Energy
Vibration limit switches have no moving
parts, therefore calibration in the medium
is not required. In combination with
integrated self-monitoring, this technology
has prevailed in process automation because
of its reliability.
Due to its universal nature, Liquiphant
has proved itself in millions of applications
worldwide.
Universal applications and
no calibration required in
changing liquids
Unaffected by turbulence
and external vibration
Universal applications
in air bubbles and foam
(foam is not recognised
as liquid)
Universal applications
in all pumpable liquids
up to a viscosity of
10,000 cSt (mm 2 /s)
Benefits:
• Fast commissioning – no calibration
necessary
• Using one type of instrument in different
applications reduces logistics expenditure
3

Safe…
Numerous connections
Hygienic and easily adapted process
connections meet the requirements of the
food industry. Numerous standards have
been established in practical operation.
Liquiphant M FTL50H/FTL51H offers a
large selection of common connections,
e.g. dairy fi tting, Varivent, DRD, TriClamp,
NEUMO etc. thus safeguarding the
adaptation to these standards.
3.1.B certified materials
Process safety and traceability are constantly
gaining more importance in the food industry.
Where requested, Endress+Hauser uses
certifi ed materials for parts in contact with
media, e.g. sensor and welded accessories.
An EN 10204 material certifi cate is included
in the scope of delivery and welded
accessories are supplied with FDA-listed
sealing material.
Hygienic design
Process conditions in the food industry place
high demands on level limit instruments.
These requirements are met by the hygienic
version of Liquiphant M with its polished
sensor (R a ≤1.5 µm or R a ≤ 0.3 µm), the
relevant connections and the stainless steel
housing. This housing has a lasered type
plate (which cannot be lost) and is thus
ideally suited to high-pressure external
cleaning.
Liquiphant M is FDA, EHEDG and 3A
certifi ed.
The modular instrument concept with its
exchangeable components and electronic
interfaces facilitate easy and fl exible
adap tation to existing systems at any time.
Standard Liquiphant
M FTL50H/FTL51H
includes a large selection
of hygienic process
connections
Minimum alarm
Liquiphant M in the wet
area of a food plant
Benefits:
• Experience a simplifi ed plant
validation with tested and certifi ed
instruments
• The instruments adapt to your plant and
not vice versa
4

External cleaning
The stainless steel housing provides resistance
against aggressive cleaning agents. It also
offers hygienic advantages, as it has no
dead space, is condensation resistant and is
easily cleaned. The Liquiphant M standard
design includes IP 66 ingress protection.
The installed Goretex fi lter reliably prevents
condensate formation inside the housing.
In addition, the O-ring integrated at the
edge of the electronic insert seals the
inner part of the sensor against the interior
space of the housing. The sealing concept
has proved its worth and offers a high
degree of operational safety in all hygienic
applications in which chemical agents
and cleaning devices are used for external
cleaning.
Dry-run protection
All models of the Liquiphant family (with
the exception of Liquiphant S Failsafe
FDL60/61) may also be used as minimum
limit switches, e.g. in pipes from a nominal
diameter of DN 25 onwards. A setting
at the electronic insert (minimum safety)
ensures the reliable operation of the
instru ments. For example, when used in
dry-run protection of pumps. In addition,
special sensor properties support the safe
and reliable operation since the sensor is
unaffected by air bubbles, foam formation or
pipe vibration.
Liquiphant stainless steel
housing with strong
condensation formation
Construction without
seals and gapless to fit
perfectly in hygienic
applications
Liquiphant T FTL20 in
minimum detection and
pump cut-off
Reliable protective
measures inside the
instrument
Benefits:
• Clean your plant as usal without any
additional effort
• Maximum or minimum monitoring – one
instrument type for all measurement tasks
5

Safe…
Ignition risk protection
Safe instrumentation – even in case of an
error, Liquiphant must not be the cause
of any ignition risk. Endress+Hauser took
this into consideration during the
develop ment stage, ensuring that sparks
cannot occur during the exchange of
electronics in an Ex zone, despite open
contacts.
For this reason, Ex zone instruments have an
integrated Zener barrier. Liquiphant thus
offers a high degree of safety also in relation
to the service concept.
Antistatic coating
Different sensor materials are often used in
chemical processes or in mixed substances
(Explosion Group IIB/IIC). Coating is
applied where stainless steel is not suffi cient
to protect instruments against corrosion.
The operator is responsible for excluding
electrostatic charging in vessels. Coating
media-contacting parts with a conductible
surface (PFA) reliably prevents electrostatic
charging of the sensor.
Therefore, Liquiphant is not subject to any
limitations in relation to the operation of
systems with plastic coating in Zone 0/1
(ATEX II 1/2G).
Benefits:
• Fast and safe commissioning of the
instrument as well as exchange of
electronics on site in Ex zones
• One type of instrument in different
applications reduces your logistics
expenditure and increases safety
ATEX
6

Second line of defence
Is it possible to further increase the standard
safety of a Liquiphant in order to reduce
the risk of damage to a plant? Yes!
The instruments may be equipped with a
second mechanical process se pa ration –
second line of defence. A process
connec tion, usually a thread or fl ange, adapts
the instruments to the existing vessel or
pipe. This mechanical connection separates
the process atmosphere (temperature,
pressure, aggressiveness, toxicity) from
its external environment. The fi rst barrier
for the medium results from welding the
process connection to the parts of the
instrument located in the process.
While the fork of a Liquiphant is monitored
for corrosion, passive components, e.g. pipe
extensions, cannot recognise such errors.
The medium might be forced outside if, for
example, pitting corrosion occurs in a pipe
extension. The second barrier of a pressure,
gas or diffusion-tight feedthrough – second
line of defence – prevents this in a safe and
reliable manner.
In Liquiphant, this second process separation
is a glass seal set in metal. It ensures the
electric connection to the fork drive and is
provided pressure-proof (O-ring) or even
diffusion-proof (welded) behind the process
connection.
Liquiphant M offers the second process
separation as an option – in Liquiphant S
FTL70 and FTL71 it is part of the standard
scope of delivery.
Liquiphant S –
welded feedthrough
Liquiphant M –
O-ring-sealed
feedthrough
Benefit:
• Extend the basic safety of a Liquiphant, if
your application requires it
7

Innovative…
Extended process temperatures
Level limit measurements in process
temperatures up to +280 °C (+300 °C
for maximum 40 hours) do not present
any problem for Liquiphant S (High
Temperature) FTL70/FTL71! Make use of
the advantages of a vibration limit switch
even in extreme process conditions.
The requirements of instrument material
and development rise drastically in the
process temperature range above 200 °C.
Extreme requirements can only be rea lised
by the careful selection of suitable materials,
the latest technologies and strain simulations.
Process and environmental safety are of
paramount importance. Liquiphant S (High
Temperature) takes all requirements into
consideration in its special design, safety
and certifi cation concept.
Design
• Electrical connector for every process
control
• Threads starting at G ¾", fl anges starting
at DN 25
• Different materials for all parts in contact
with media:
Stainless steel 1.4435/1.4462 or Alloy C
PFA Plastics (up to 230 °C)
Enamel (up to 200 °C)
Safety
• Materials geared to each other for the
entire temperature range, including
extreme temperature fl uctuations
• Integrated, gas-tight process feedthrough
(welded) is standard
• Automatic corrosion recognition
• 3.1.B materials and certifi cates as
standard
Approvals
• Overspill protection WHG checked at the
push of a button
• SIL 2/3 according to IEC 61508 and
61511
• ATEX II EEx ia, EEx de, EEx d
• CSA
• FM
Fissures in V4A
(conventional instruments)
Stability in Duplex-steel
(Liquiphant S HT)
Stack drive – materials
geared to each other
Benefits:
• You only use instruments geared to your
process
• High degree of reliability and long
serviceable life – even in extreme process
conditions
8

Liquiphant S FTL71 in
minimum detection in a
jacketed vessel
Liquiphant S FTL71 in
maximum detection
Two Liquiphant S FTL71
instruments in a bitumen
loading point
User-friendly and application-oriented
The signifi cantly extended application limits
and the tried and tested advan tages of the
vibration principle mean Liquiphant S (High
Temperature) works hard. A few typical
applications for Liquiphant S FTL70 and
FTL71 are listed below.
• Vessels with chemical processes at
temperatures above +150 °C – for e.g.
secondary amine pro ducts in an agitated
tank. Density changes of different products
do not affect the switching properties of
the sensor.
• High-temperature heating systems –
thermal oil in buffer tanks.
• Textile fibre melting – polyethylene,
nylon processing.
• Insulated tanks in steam applications –
water expansion vessels (63 bar steam
pressure corresponding to +278 °C).
• Media reaching minimum viscosity only
at high temperatures – processing of
resins, bitumen or sulphur.
• All applications in which mechanical
systems need frequent cleaning or
corrosion checks.
Benefit:
• You use instruments which have been
tried and tested in operation
9

Innovative…
Standardised self-monitoring
Compared to other physical measuring
principles, e.g. conductive probes or fl oat
switches, Liquiphant offer a real advantage –
frequency evaluation facilitating automatic
self-monitoring of the fork. A change in
oscillation surpassing a permitted variable
indicates irregularities of the fork, e.g.
corrosion or build-up. This automatically
triggers safety-oriented switching in the
instrument. All versions of Liquiphant
work with such a frequency evaluation and
offer the user safe plant operation in their
standard design.
Intelligent sensor without calibration
Every fork has its own characteristic
frequencies. These specifi c parameters must
be available, if needed, during the entire
period of operation. Intelligent, electronic
components that are fi rmly connected to
the fork safeguard the availability of these
parameters at any time.
How it is done
When changing electronics, the new
electronic insert is automatically uploaded
with the fork parameters. The instrument
calibrates itself and can be used immediately
after the exchange. Time-consuming,
manual instrument calibration, e.g. by
potentiometer, is not required.
fa 15 % Switch point at approx. 850 Hz
fa Oscillation in air approx. 1 kHz
Immersion depth [mm]
25
A
L
A
R
M
A
L
A
R
M
Frequency change caused
by build-up (low alarm)
0
0 400 fa 15 % fa fa +6,5 % 1500 f [Hz]
Sensor alarm Normal operation Corrosion alarm Sensor alarm
Frequency evaluation
Frequency change caused
by corrosion (high alarm)
Benefits:
• Safety-oriented switching without
any calibration, even if errors occur
• Irrespective of which Liquiphant you
employ, frequency evaluation and
selfmonitoring are always integrated
10

Intrinsically safe signal
transmission
NAMUR
EN 50227/DIN 19234
8/16 mA
PulseFrequencyModulation
Current pulse
FEL 58
2,1 mA
1,2 mA 1,2 mA
FEL 55
16 mA
8 mA 3,6 mA
FEL 57
150 Hz 50 Hz 0 Hz
uncovered
covered sensor defect
uncovered
covered sensor defect
uncovered
covered sensor defect
To be connected to
Sensor defect (corrosion)
• NAMUR breaker amplifier
e.g. E+H FTL325N, FTL375N
• Remote I/O
• Analogue I/O e.g. SPS
• 4... 20 mA MUS e.g. RMA 422
• Endress+Hauser Nivotester
FTL32x(P) und FTL37x(P)
Line breakage/
short circuit
Functional safety SIL
IEC 61508 and 61511
Separate fault message relay
(Fault = Level)
(Fault ≠ Level)
Test function “Periodical
inspection”
Undefined status (load)
Max. detection
3-channel transmitter PFM/NAMUR
Reducing wiring expenditure and optimising
use of control cabinets means lower costs –
Endress+Hauser’s instrumentation sets a
good example! Nivotester FTL325 and
FTL375 transmitters are available in 3-channel
version for NAMUR and PFM technology
and in top-hat rail and 19" versions. This
permits plants (in Ex zones) to be designed
in an cost-effective manner.
How it is done
Providing on-off control and an overspill
protection in one vessel with only one
transmitter has proven itself to be an
important advantage in practical operation.
The required cabinet space is significantly
reduced, if 30 measuring points use only
10 transmitters instead of 30 power supply /
switching units.
FTL375P/N
FTL325P/N
Benefits:
• Optimum use of your time in installation
and maintenance
• Plan and realise your plant in a
cost-effective manner
11

Cost-effective…
Segmentation
“You only pay what you really need.”
Endress+Hauser takes this statement seriously
and offers instrument types in three different
segments.
All Liquiphant limit switches are characterised
by a high quality standard. The instruments
have been designed in a modular fashion
in the M and S segment, allowing users
to select an instrument tailored to their
application.
Part of the variety of the modular instrument
design is:
• Different lenghts
• All process connections
• A variety of electronic interfaces
• Different sensor materials
• Approvals and certificates for all areas
• Special designs
Technical details can be found on page 16.
FTL50H
FDL60
FTL70
FTL50
FTL50H
FTL51C
FTL20
FTL20H
S – segment
For demanding applications e.g. high process
temperatures or as part of an overspill
protection eliminating annual function
inspection.
Important industries of the S segment:
• Petrochemicals
• Oil & Gas
M – segment
Applications combining the respective
instrument variants in one modular system.
Important industries of the M segment:
• Chemicals
• Food
• Pharmaceuticals
T – segment
• Simple selection
• Instrument exchange in case of defect
• Fast delivery
• Focus on factory automation and food
applications
Benefits:
• Only pay for what you need
• Instrumentation is optimised for the
application
12

Overspill protection
High demands are placed on overspill
protection in process engineering. The
Liquiphant complies with all current
European legislation and can even be used
as part of a safety instrumented system in
accordance with IEC 61508/IEC 61511.
IEC 61508/61511 aims to provide a uniform
approach to risk assessment. It aims to defi ne
the tolerable risk, establish the current risk
and specify the risk reduction required to
achieve a given safety integrity level (SIL).
IEC 61511 is aimed specifi cally at the process
industry.
Liquiphant M & S used in conjunction with
the Nivotester switch unit, based on the
PMF technology, have been designed and
manufactured to meet the requirements of
IEC 61508. They have been certifi ed by
the German TÜV as suitable for inclusion in
safety instrumented systems in accordance
with the above standards. A safety manual
is available detailing all relevant data needed
to complete safety system calculations.
Probability of failure on demand (PFD),
hardware fault tolerance (HFT) and safe
failure fraction (SFF) fi gures return values
that typically fall within the required
suitability range for SIL 2/3.
Additionally, an integral function check
facility allows remote system testing
without removing the probe from the tank.
Regular function tests can be carried out
safely and cost-effectively at the mere press
of a button!
Benefits:
• You work with a competent partner in all
issues of safety engineering
• Products which fit into your national
legislation
13

Cost-effective…
Functional safety
The process industry demands the highest
degree of safety and reliability from
components of distributed control systems
(DCS). Endress+Hauser’s instrumentation
meets these requirements of functional safety
and is at home in all processes relevant to
safety. The required level of safety of a
technical plant is classifi ed according to the
international IEC 61511 standard and is
determined using risk assessment. The
international standard for functional safety,
IEC 61508, describes the guideline for
safety instrumented systems in order to
reduce the risks to people, assets and the
environment. A compliant loop normally
consists of a measuring instrument, a
control unit and an actor. Both standards
subdivide plants and instruments into four
safety levels: from SIL 1 for low risks
through to SIL 4 for very high risks.
The Liquiphant M, Liquiphant S and
Liquiphant S Failsafe in conjunction with the
Nivotester switch units, have been designed
in accordance with IEC 61508 and meet
the requirements of the standard. A safety
document is available which provided the
data required to allow the Liquiphant to
be included as part of the risk assessment
calculations. Test periods are also defi ned
and use the standard function test facility
as a means of confi rming the system
functionality.
Liquiphant M – FTL50/51, FTL51C with
plastic or enamel coating up to +150 °C.
Liquiphant S – FTL70/71 up to +280 °C,
with PFA coating up to +230 °C,
with enamel coating up to +200 °C.
SIL 2
SIL 3
PFM
PFM
FEL51, 2-wire AC
FEL52, 3-wire DC-PNP
FEL54, AC/DC DPDT
FEL55, 8/16 mA
Liquiphant M FTL50/51/51C
Liquiphant S FTL70/71
Periodical inspection by start or
disassembly
Liquiphant M FT50/51/51C
Liquiphant S FTL70/71
Periodical inspection by pressing a button
(function test)
NAMUR
Liquiphant S Failsafe FDL60/61
Periodical inspection may be waived
PFM
Liquiphant M FTL50/51/51C
Liquiphant S FTL70/71
Periodical inspection by start or disassembly
Liquiphant M FTL50/51/51C
Liquiphant S FTL70/71
Periodical inspection by pressing a button
(function test)
Benefits:
• Reduce the time for developing
operational proof
• Economical operation of one type of
instrument in safety applcations
14

Instrumentation via fieldbus
Fieldbus technology has conquered large
areas of process engineering and automation
technology is unthinkable without it today.
Modern plants are increasingly realised in
fi eldbus techno logy.
Endress+Hauser is the fi rst producer of
instrumentation to equip vibration limit
switches with fi eldbus interfaces. These
instruments can be integrated into exis ting
topologies safe for the future without any
expenditure.
PROFIBUS PA
An increasing number of users employ
Liquiphant M and Liquiphant S with
PROFIBUS PA electronics. Further
information concerning the sensor, e.g. the
current oscillation, may be read out via
PROFIBUS PA. In addition, it is possible to set
different sensor parameters via operating
software (e.g. Fieldcare from
Endress+Hauser). Profi t from our
ex perience and our know-how from more
than 30,000 instruments installed.
AS-Interface
Liquiphant T FTL20 is the fi rst Liquiphant
with AS interface (ASi) electronics. ASi-bus
is a simple network solution for actors and
sensors. It has become a standard in plant
automation.
Liquiphant M FTL50
used as a maximum
alarm in a PROFIBUS PA
plant
Liquiphant T FTL20 used
as empty detection in a
DN 50 pipe, integrated
into an ASi-bus network
Benefit:
• Fieldbus systems offer simple
commissioning and the possibility of
additional process information
15

A complete programme of proven technology
The Liquiphant family at a glance
Liquiphant T
Liquiphant S
Description FTL20 FTL260 FTL20H FTL50
FTL51
Applications Standard Hygiene /
Food
FTL50H
FTL51H
Standard Hygiene /
Pharma
Design Compact Compact +
Pipe extension
Process
temperature (°C)
Process pressure
max. (bar)
Process
connections
Output
Approvals
Application limits
G ½"
G ¾"
G 1"
AC, DC, ASi
bus
WHG
overspill
WHG
leakage
FTL51C FTL70 FTL71 FDL60 FDL61
Coating High temperature Failsafe
Pipe
extension
Compact
Pipe
extension
-40... +150 -50... +150 -60... +280
(+300 / 50 h cum.)
Compact
-40... +150
40 64 / 100 40 100 40
G 1" G ½"
G ¾"
G 1" Hygiene
AC, DC
WHG
overspill
AC, DC,
ASi bus
WHG overspill
EHEDG
G ¾", G 1", flange DIN, ANSI, JIS, Hygiene
G ¾", G 1", flange DIN,
ANSI, JIS,
AC, DC, AC-DC relay, NAMUR, 8/16 mA, PFM,
PROFIBUS PA
EHEDG, 3A
WHG overspill, SIL 2 / 3, ATEX, CSA, FM
Very viscous media (viscosity max. 10,000 cSt / mm 2 / s), bridge formation by hardening build-up
Pipe
extension
G 1", flange DIN, ANSI, JIS,
Hygiene
PFM
WHG overspill, SIL 3, ATEX,
CSA, FM, VdTÜV 100
(liquefied gas)
Fruther documentation
FA001F Level Measurement
CP007F Selection Guide Level Limit Detection
Applicator ® Selection Software
Technical Information
TD001E Liquiphant T FTL260
TD019E Liquiphant T FTL20
TI328F Liquiphant M FTL50/51/50H/51H
TI347F Liquiphant M FTL51C
TI223F Liquiphant S Failsafe FDL60/61
TI354F Liquiphant S FTL70/71
TI350F Nivotester FTL325P
TI360F Nivotester FTL375P
TI379F Liquiphant T FTL20H
TD021E Nivotester FTL325N/375N
Instruments International
09.03/MMC
Endress+Hauser GmbH+Co. KG
Instruments International
Colmarer Straße 6
79576 Weil am Rhein
Germany
Tel. +49 7621 975 02
Fax +49 7621 975 345
http://www.endress.com
info@ii.endress.com
CP003F/00/en/10.06
52023448
UE/INDD 2.0