Name: Liquiphant FTL51B
Brand: Endress+Hauser
Availability: InStock

Liquiphant FTL51B - digital, simple and safe

Point level switch for all liquid media

The Liquiphant FTL51B with bluetooth module

Liquiphant FTL51B with Bluetooth® Technology

Liquiphant FTL51B with LED module

A large selection of product variants for different applications is available

Preventive maintenance is possible with corrosion detection via Heartbeat Technology

Liquiphant with permanent function check is the safe choice for point level detection in liquids

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Liquiphant FTL51B - digital, simple and safe

Point level switch for all liquid media

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Benefits

Universal measuring principle for limit detection – proven vibronic technology
Developed according IEC 61508 for highest safety – SIL2/3 applications (3rd party approved)
Periodic proof testing is quickly and simple organized with guided wizards via the SmartBlue-App or via a test button or magnetic pin from outside. Via digital communication you can initiate the device for a fast and easy testing of the safety loop.
Heartbeat Technology allows safe, continuous diagnostics and a simple verification, without process interruption
Centralized asset management with easy online access to all device information thanks to digital communication
Second line of defense to protect the environment

Integrated technologies

Services and resources

Product Support Product documentation, troubleshooting articles, device details and more.

FLEXible answers to individual needs

Current product

Liquiphant FTL51B - digital, simple and safe

High-end products
Highly functional and convenient

What is FLEX?

FLEX selections

Technical excellence

Simplicity

Fundamental selection Meet your basic measurement needs

Lean selection Handle your core processes easily

Extended selection Optimize your processes with innovative technologies

Xpert selection Master your most challenging applications

Variable

Learn more about the FLEX selections

Manufacturer's warranty

Engineered for confidence

Our instruments are designed for long‑lasting performance, precise measurement, and dependable operation in demanding industrial environments. Each product includes a standard manufacturer’s warranty that reflects our commitment to quality and to the trust you place in our solutions.

Should a warranty case occur, the device will be assessed and the applicable remedy will be provided in line with the warranty terms – helping ensure a reliable and efficient resolution and supporting continued operation of your measurement point.

Request for extended warranty

If you require extended warranty coverage, simply contact your local Endress+Hauser representative. Our experts will advise you on the available options to match your application and risk profile, helping you protect your investment, reduce unexpected repair costs, and ensure reliable long‑term operation beyond the manufacturer's warranty period.

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Warranty terms apply

The manufacturer's warranty and extended warranty are subject to specific conditions. For full details, please refer to the locally applicable General Terms and Conditions (GTC), which can be found on the respective country page of our website.

Services by your side

Right‑first‑time commissioning, worldwide

Endress+Hauser’s qualified service engineers ensure your measurement devices are commissioned right the first time, delivering application‑aligned accuracy, regulatory compliance, and operational confidence from startup onwards, anywhere in the world.

Remote support you can trust wherever you operate

With Endress+Hauser Smart Support, you benefit from faster issue resolution, higher uptime, reliable global expertise across the entire product lifecycle – and lasting peace of mind.

Committed to long‑term, sustainable performance

With deep field expertise, harmonized processes, and continuous monitoring, we accompany you with comprehensive service offerings – from initial start‑up through instrumentation maintenance to process optimization – as a true lifetime partner delivering improved outcomes.

For additional information, please contact your local Endress+Hauser representative.

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24/7 customer portal

Personalized transaction space

Check prices and delivery times, save your favorite products, create quotes and place orders in just a few clicks and track deliveries at any time. With access to your complete order and quote history including all relevant documents you benefit from full transparency throughout the entire process.

Easy access to technical documentation

Select and download all technical documentation such as operating manuals, calibration certificates, approvals and CAD drawings conveniently bundled as a complete documentation package for your entire order or quote.

My Endress+Hauser – all in one place

My Endress+Hauser is your 24/7 connection to Endress+Hauser – in the office, in the field or on the go. It brings together transaction management, documentation and software downloads, knowledge base access, customer support, engineering tools and cloud‑based IIoT services helping you work easier, faster and more efficiently.

Technology

Ethernet-APL portfolio

Ethernet is ready for the process industry: Ethernet-APL ensures a high cable length, an easy installation and explosion protection. This makes high-speed communication possible in the field.

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Technology

Smart instrumentation through Heartbeat Technology

You want to increase plant performance and reduce costs? Our smart instrumentation portfolio with Heartbeat Technology offers in-depth device insight for more cost-efficiency and operational safety.

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Have questions about this product?

Selection of compatible products

Nivotester FTL325N - Vibronic point level detection

Vibronic Point level detection Nivotester FTL325N

Switching unit with NAMUR input for rail mounting or single installation

Nivotester FTL325P - Vibronic point level detection

Vibronic Point level detection Nivotester FTL325P

Switching unit with intrinsically safe signal circuit for connection to Liquiphant or Soliphant

RLN22 1- or 2-channel, 24 V DC, isolating amplifier with relay signal output for systems up to SIL 2

RLN22 NAMUR isolating amplifier

NAMUR isolating amplifier, 1/2-channel with 24 V DC and NAMUR or switching contact input as well as relay output, optionally with SIL and Ex

RLN42 2-channel, wide-range isolating amplifier with universal power supply

RLN42 NAMUR isolating amplifier

NAMUR isolating amplifier, 2-channel with 24 to 230 V AC/DC and NAMUR or switching contact input as well as relay output, optionally with SIL and Ex

Spare parts and accessories

further parts

Housing 2-wire platform Liquiphant

further parts

Order code XPF0040-

Drawing number 10

Housing/housing accessories

Blind plug, M20, 316L, o-ring EPDM

Housing/housing accessories

Order code 71487198

Drawing number 14

Housing/housing accessories

Blind plug, M20, Alu, o-ring EPDM

Housing/housing accessories

Order code 71487199

Drawing number 14

Housing/housing accessories

Blind plug, NPT1/2, 316L

Housing/housing accessories

Order code 71487203

Drawing number 14

Spare parts & accessories

Choose from our suggested options

Looking for more options?

Use the extended configuration to configure from all available options.

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Configuration details

Liquiphant-FTL51B

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CAD Drawings

Configuration support

Spare parts and accessories

further parts

Housing 2-wire platform Liquiphant

further parts

Order code XPF0040-

Drawing number 10

Housing/housing accessories

Blind plug, M20, 316L, o-ring EPDM

Housing/housing accessories

Order code 71487198

Drawing number 14

Housing/housing accessories

Blind plug, M20, Alu, o-ring EPDM

Housing/housing accessories

Order code 71487199

Drawing number 14

Housing/housing accessories

Blind plug, NPT1/2, 316L

Housing/housing accessories

Order code 71487203

Drawing number 14

Spare parts & accessories

Selection of compatible products

Vibronic Point level detection Nivotester FTL325N

Switching unit with NAMUR input for rail mounting or single installation

Vibronic Point level detection Nivotester FTL325P

Switching unit with intrinsically safe signal circuit for connection to Liquiphant or Soliphant

RLN22 NAMUR isolating amplifier

NAMUR isolating amplifier, 1/2-channel with 24 V DC and NAMUR or switching contact input as well as relay output, optionally with SIL and Ex

RLN42 NAMUR isolating amplifier

NAMUR isolating amplifier, 2-channel with 24 to 230 V AC/DC and NAMUR or switching contact input as well as relay output, optionally with SIL and Ex

Process temperature	-50 °C...+150 °C (-58 °F...+302 °F)
Process pressure / max. overpressure limit	Vacuum...100 bar Vacuum...1450 psi
Min. density of medium	0.5 g/cm³ (0.4 g/cm³ optional)
Measuring principle	Vibration Liquids
Characteristic / Application	Compact vibronic device with an optional pipe extension up to 6 m (19.7 ft); Modular housing concept; Wide range of certificates
Specialities	Heartbeat Technology, Bluetooth® Operation and maintenance SmartBlue App, LED Module, RFID TAG for easy identification, Second line of defense, Ambient temperature down to -50°C (-60°C optional), Temperature spacer for high process temperature, Plug and play functionalities
Supply / Communication	19...253V AC / 2-wire, 10...55V / DC-PNP 3-wire, 9...20V DC with relay DPDT, 19...253V AC or 19...55V DC with relay DPDT, 2-wire NAMUR, 2-wire PFM, 4-20mA HART
Ambient temperature	-60 °C...+70 °C (-51 °F...+158 °F)
Main wetted parts	316L Alloy
Process connection	Threads: G3/4A, G1A, R3/4", R1, NPT3/4, NPT1 Flanges: DN25...DN100 ASME 1"...4" JIS 25A...100A
Process connection hygienic	Tri-Clamp ISO2852
Sensor length	Up to 6 m (19.7 ft)
Communication	2-wire direct load HART DC-PNP 3-wire Relays NAMUR PFM Bluetooth® wireless technology
Certificates / Approvals	ATEX, IEC Ex, CSA, NEPSI, KC, JPN Ex, INMETRO, UK Ex
Safety approvals	Overfill protection WHG SIL2/ SIL 3 according to IEC 61508
Design approvals	EN 10204-3.1 NACE MR0175, MR0103 ASME B31.3 Process Piping AD2000 CRN AD 2000
Marine approval	ABS/ LR/ BV/ DNV
Options	Heavy duty stainless steel housing
Components	FTL325P Interface PFM FTL325N Interface NAMUR
Process temperature	-50 °C...+150 °C (-58 °F...+302 °F)
Process pressure / max. overpressure limit	Vacuum...100 bar Vacuum...1450 psi
Min. density of medium	0.5 g/cm³ (0.4 g/cm³ optional)
Measuring principle	Vibration Density
Product Headline	Vibronic point level switch with optional extension tube for liquid applications in hazardous areas . Reliable density measurement values not affected by: changing media properties, gas bubbles, foam, build-up, flow or turbulences.
Characteristic / Application	Compact vibronic device with an optional pipe extension up to 6 m (19.7 ft), Modular housing concept, Wide range of certificates
Ambient temperature	-60 °C...+70 °C (-51 °F...+158 °F)
Process temperature	-50 °C...+150 °C (-58 °F...+302 °F)
Process pressure	Vacuum...100 bar Vacuum...1450 psi
Wetted parts	316L Alloy
Sensor length	Up to 6 m (19.7 ft)
Certificates / Approvals	ATEX, IEC Ex, CSA, NEPSI, KC, JPN Ex, INMETRO
Specialities	Heartbeat Technology, Bluetooth® Operation and maintenance SmartBlue App, LED Module, RFID TAG for easy identification, Second line of defense, Ambient temperature down to -50°C (-60°C optional), Temperature spacer for high process temperature, Plug and play functionalities
Components	Density Computer FML621
Measuring range	Density range: 0.3 to 2 g/cm³
Other approvals and certificates	Overfill protection WHG SIL2/ SIL 3 according to IEC 61508

Liquiphant FTL51B - digital, simple and safe

Liquiphant FTL51B - digital, simple and safe

Liquiphant FTL51B - digital, simple and safe

Product information

Selection of compatible products

Spare parts and accessories

Choose from our suggested options

Spare parts and accessories

Selection of compatible products

My Endress+Hauser

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Liquiphant FTL51B - digital, simple and safe

Liquiphant FTL51B - digital, simple and safe

Liquiphant FTL51B - digital, simple and safe

Product information

Selection of compatible products

Spare parts and accessories

Choose from our suggested options

Spare parts and accessories

Selection of compatible products

Products & Services

Industries

Support

Company

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