
Specs at a glance
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Process temperature
-50 °C...+150 °C
(-58 °F...+302 °F) -
Process pressure absolute / max. overpressure limit
Vacuum...100 bar
Vacuum...1450 psi -
Min. density of medium
0.5 g/cm³
(0.4 g/cm³ optional)
Field of application
The Liquiphant FTL51B is specialized for the process industry and developed to be used directly in SIL2 and SIL3 applications. You conduct periodic proof tests according to SIL or WHG mobile with an intuitive wizard. At the end you receive an automated documentation. Liquiphant measures reliably and is not affected by changing media properties, flow, turbulences, gas bubbles, foam, vibrations or build-up. The device is easy to use, has a digital connection and gives real-time data at hand.
Point level switch with extension tube for all liquids
Process connections: Threads, flanges and hygienic process connection (Tri-Clamp)
Temperature: -50 to +150°C (-58 to +302°F)
Pressure: -1 to +100bar (-14.5 to +1450psi)
Sensor material: 316L, Alloy
International explosion protection certificates, overfill prevention WHG, SIL, marine approvals
Benefits
Universal measuring principle for limit detection – proven vibronic technology
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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
Videos
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Preventive maintenance is possible with corrosion detection via Heartbeat Technology
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Liquiphant with permanent function check is the safe choice for point level detection in liquids
Extended selection
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High-end products
- Highly functional and convenient
Technical excellence
Simplicity

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Standard products
- Reliable, robust and low-maintenance
Technical excellence
Simplicity
-
Specialized products
- Designed for demanding applications
Technical excellence
Simplicity
Variable
FLEX selections | Technical excellence | Simplicity |
---|---|---|
Fundamental selection Meet your basic measurement needs |
Technical excellence
|
Simplicity
|
Lean selection Handle your core processes easily |
Technical excellence
|
Simplicity
|
Extended selection Optimize your processes with innovative technologies |
Technical excellence
|
Simplicity
|
Xpert selection Master your most challenging applications |
Technical excellence
|
Simplicity
Variable |
Predecessor
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Measuring principle
Vibration Liquids
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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,
NAMUR,
PFM -
Ambient temperature
-60 °C...+70 °C
(-51 °F...+158 °F) -
Process temperature
-50 °C...+150 °C
(-58 °F...+302 °F) -
Process pressure absolute / max. overpressure limit
Vacuum...100 bar
Vacuum...1450 psi -
Min. density of medium
0.5 g/cm³
(0.4 g/cm³ optional) -
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
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Sensor length
Up to 6 m (19.7 ft)
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Communication
2-wire direct load
DC-PNP 3-wire
Relays
NAMUR
PFM
Bluetooth® wireless technology -
Certificates / Approvals
ATEX, IEC Ex, CSA, NEPSI, KC, JPN Ex, INMETRO
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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 GL
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Options
Heavy duty stainless steel housing
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Components
FTL325P Interface PFM
FTL325N Interface NAMUR
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Measuring principle
Vibration Density
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Product Headline
Liquiphant with Density Computer FML621
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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 absolute
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
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Measuring range
Density range: 0.3 to 2 g/cm³
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Other approvals and certificates
Overfill protection WHG
SIL2/ SIL 3 according to IEC 61508
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