The Liquiphant family

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Products Solutions Services
The Liquiphant family
Point level detection in liquids using the vibronic measuring principle
Le vel

Liquiphant Family
Innovation with a superb background
Liquiphant, the original from its inventor
When Endress+Hauser invented the vibronic principle
30 years ago it paved the way to safe and reliable level monitoring.
Within a very short period of time, the point level switches of the Liquiphant line became classics.
More than 4.0 million vibronic point level switches installed worldwide emphasize the competence and experience of
Quality, safety and reliability are firm cornerstones for us.
The latest simulation and manufacturing processes are used from development through to production in order to meet the high demands of our customers.
Endress+Hauser is a family-owned company with over
12,000 employees, serving customers in 40 countries worldwide. The international solution provider has offered a large range of products and services for all process automation sectors for 60 years.
Functional principle
Point level switches using the vibronic principle are used in process automation applications everywhere. A sensor in form of a tuning fork is exited to its resonance frequency by a piezoelectric drive. The frequency changes as liquid covers the fork. This change is analyzed and converted into a switching signal.
The instruments of the Liquiphant family reliably monitor point levels of all liquids in tanks, vessels and pipes.
Applications are varied and range from simple operational point level detection (minimum and maximum monitoring) and leakage monitoring or overfill prevention through to protective facilities in plant parts subject to disturbance regulations.
Mechanics combined with electronics (mechatronics) –
approved point level detection
Piezo drive – the heart of Liquiphant
Resonant circle
Analysis electronics
Detection of frequency shift
Frequency shift upon immersion into the media

Universal range of application
Unaffected by turbulence and external vibration
Universal applications in all pumpable liquids up to a viscosity of 10,000 cSt
Universal applications and no calibration required in changing liquids
Universal applications in air bubbles and foam (foam is not recognized as liquid)
For universal use across the process industries
A distinct advantage of the vibronic principle is its mode of operation.
Point levels are detected unaffected by the physical properties of the medium, like:


Dielectric constant


Density changes


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:


Oil & Gas

Power & Energy

Life Sciences / Pharmaceuticals

Food & Beverages

Machine building
Vibronic point level switches excel by the absence of any mechanically moved parts in the process. Functional calibration to the respective medium is not required. Combined with integrated self-monitoring, a system is created which has prevailed in process automation by its reliability. This safeguards an operation free of calibration and maintenance. In turn, money is saved and thus operating costs.
Due to its universal nature, Liquiphant has proved itself in millions of the most varied applications and every year new measuring points are added worldwide.

Liquiphant Family
Convincing properties
Continuous self-monitoring
Compared to other physical measuring principles, e.g. float switches, the vibronic point level switches of the
Liquiphant family offer a decisive advantage – frequency evaluation facilitating automatic self-monitoring of the fork. The frequency of the fork is continually monitored. A change in oscillation above or below a permitted variable indicates irregularities of the fork, e.g. inadmissible corrosion. This automatically triggers a safety- oriented switching of the instrument.
All of the vibronic point level switches of the Liquiphant family work with such a frequency evaluation and offer users basic safety in plant operation already in their standard design.
Intelligent sensor without calibration
Every fork has its own characteristic frequencies. These specific parameters of the instrument must be available during the entire life cycle. Intelligent, electronic components firmly connected to the fork safeguard the availability of these parameters at any time.
When changing electronics, the fork parameters are automatically uploaded to the new electronic insert.
The instrument calibrates itself and can be used immediately after the exchange.
Time-consuming, manual instrument calibration, e.g. by potentiometer, is not required.
Continuous frequency monitoring
Build-up on the fork
Corrosion on the fork
Sensor alarm
Sensor alarm
Normal operation
Corrosion alarm
0 400
15 %
+6,5 %
f [Hz]
0 25
Immersion depth [mm]
15 %
Switch point at approx. 850Hz fa Oscillation in air approx. 1kHz

Liquiphant Portfolio
Always the fitting instrument
The Liquiphant vibronic point level switches are available in different lines in order to meet the industry- specific requirements of our customers. In addition, the instruments are of a modular design.
This enables users to select an instrument tailored exactly to their application.
The modular design includes a variety of options, for example:

Customized lengths

Numerous process connections

Diverse electronic interfaces

Different sensor materials and coatings

International approvals and certificates

Custom-made instruments
Hygiene Line
Process Line
The most important technical data of the Liquiphant family
Liquiphant M (FTL50/FTL50H/

Process temperature
-50 to +150°C/-58 to +300°F

Process pressure up to max. 100bar/1,450psi

International Ex-approvals

Approvals for the food (3-A, EHEDG) and life sciences industry (ASME

Safety applications SIL2/3
Liquiphant Basic Line (FTL31/

Process temperature
-40 to +150°C/-40 to +300°F

Process pressure up to max. 40bar/580psi

CIP/SIP cleanable

Ingress protection IP 69 always tight, also in intensive cleaning and submersion
Liquiphant S (FTL70/FTL71)

Process temperature
-60 to +280°C/-76 to +536°F

Process pressure up to max. 100bar/1,450psi

All industry-relevant approvals

Safety applications SIL2/3
Liquiphant FailSafe (FTL80/FTL81/

Process temperature
-60 to +280°C/-76 to +536°F

Process pressure up to max. 100bar/1450psi

Functional safety up to SIL3 with one device

Proof test interval up to 12 years
The point level switches of the
Hygiene Line meet the requirements of the life sciences and food industry.
Point level switches superbly suited to all processes of the chemical industry, oil & gas, power and energy as well as machine building.

Liquiphant Family
Experts for hygienic applications
Hygienic design
Pollution or contamination of products can cause very high consequential costs and a tremendous loss of image.
Furthermore, the health of people may be impaired. For these reasons, the food and life sciences industry place high demands on plants and equipment. A hygienic design, suitable materials and good cleanability are important basic prerequisite in this respect. International and national directives, norms and standards control the requirements of such plants and equipment.
The point level switches of the
Liquiphant Hygiene Line can cope with these challenges. Electropolished surfaces free of grease, aseptic process connections, easy cleanability of housing and sensor (CIP/SIP- cleanable), approved materials – all of these demands are entirely met by the
Hygiene Line. Certificates of the listed independent organizations confirm these properties which make
Liquiphant excellently suited to point level detection in the relevant industries.
3.1 certified materials
Process safety and traceability are important cornerstones in all hygienic processes. Therefore, Endress+Hauser offers the option of certified material quality for all parts in contact with the process, i.e. sensor and welded accessories. A 3.1 material certificate according to EN 10204 confirms the material composition. Different sealing materials are also available for welded accessories (e.g. seals conforming to FDA or USP Class VI).
Numerous connections
Hygienic process connections are imperative to meet the complex challenges. Numerous standards have been established. The Hygiene Line offers a wide selection of common hygienic connections, e.g. dairy fitting,
Varivent, DRD, Tri-Clamp, SMS, etc.
– the adaptation to existing standards is thus guaranteed.
A large selection of hygienic process connections
Accessories: Welding necks

Hygiene Industry
External cleaning
The stainless steel housings (standard and compact housing) excel with particular chemical resistance against aggressive cleaning agents. In addition, they offer further hygienically relevant benefits: They are free of dead space, condensation resistant and easily cleaned. Liquiphant is available in ingress protection IP 66 to IP 69. The sealing concept of Endress+Hauser is approved and guarantees high operational safety in all hygienic applications in which external cleaning with chemical agents and cleaning devices is required.
Pr ice
The point level switches of the Hygiene Line
Liquiphant M
Compact/short tube version
Pipe extension up to 3,000mm
Process temperature (°C/°F)
-40 to +150/
-40 to +300
-50 to +150/-58 to +300
Process pressure (bar/psi)
-1 to 40/-14.5 to 580
-1 to 64/-14.5 to 930
Hygienic approvals
Material of wetted parts
Surface quality
Ra 0.7 to 1.5µm mechanically polished
Ra < 0.38µm electropolished
Delta ferrite content according to 316L
< 1%
FDA-listed accord. to USP Class VI

Liquiphant Family
Important hygienic standards
In the Life Sciences / Biopharmaceutical industry
The ASME BPE standard (American Society of Mechanical
Engineers, BioPharmaceutical Equiqment) describes the high requirements of plants, processes and procedures in the relevant industries. Materials, design instructions, fabrication, inspection, test instructions and many other items are precisely outlined in this standard.
Liquiphant M FTL50H and FTL51H fully meet these high requirements which are imperative in the areas of biotechnology, life sciences or cosmetics.
The most important properties of the Hygiene Line are:

Electropolished surfaces with a roughness of up to
Ra < 0.38µm

Easily cleanable and corrosion resistant

Materials in contact with the process of stainless steel
316L/1.4435 with a delta ferrite content < 1%

Sealing materials according to FDA and USP Class VI

Certificate of Compliance according to ASME BPE
USP Class VI
The industry demands FDA-tested (US Food and Drug
Administration) sealing materials listed according to USP
Class VI (United States Pharmacopeia) for many applications. The standard defines six classes in which the most sophisticated tests are performed for Class VI. The
USP tests mainly concern biological reactivity examination.
The seals of Liquiphant accessories are optionally qualified according to USP Class VI and thus suited to highly hygienic processes in an optimum fashion.
In the Food & Beverages industry
3-A Sanitary Standards
3-A Sanitary Standards Inc. is an independent organization domiciled in the United States. It defines specifications and regulations for the development, production and use of hygienic plants in the food and beverage industry. 3-A
Standard compliance is confirmed by a certificate and recognized worldwide.
The European Hygienic Engineering & Design Group
(EHEDG) was founded in 1989. Its members work in the food industry and are plant or equipment suppliers, scientific institutes and official authorities.
The goal is the implementation of EU Directives 98/37 and
93/43 in the industry on a secured basis. Both directives describe the hygienic production of food and the use of equipment. EHEDG provides the basis for standards created by CEN (European Committee for Standardization). The compliance with the standard is confirmed by a certificate.
Free of TSE
The point level switches of the Liquiphant family are free of
TSE and do not contain any substances of an animal origin.
The production process evidentially does not use any substances of an animal origin either. This guarantees that so-called prions cannot enter the production process which makes Liquiphant an expert in hygienic processes with the highest demands.
Explanation: TSE refers to a number of brain diseases which are transmitted by prions. Prions are organic toxics of an animal origin with virus-type properties.
Initially Issued: 10/17/1985
Authorization No.: 459

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