Technical Data
CompareDensity
| Measuring Principle | Vibration Density |
| Characteristic / Application | Liquiphant M Density with Density Computer FML621 Temperature and pressure measurement Modular housing concept Wide range of process connections Pipe extension up to 3 m (6 m option) |
| Supply / Communication | Transmitter power supply (MUS) |
| Ambient temperature | -50...70°C -50...60°C for hazardous applications |
| Process temperature | 0...80°C (validity of accuracy data) -50...0°C / 80...150 °C (with reduced technical data) |
| Process pressure | 0...25 bar >25..100 bar (with reduced technical data) |
| Wetted parts | 316L/C4 |
| Sensor length | 115...3000 mm >3000...6000 mm (Option) |
| Output | Pulse |
| Certificates / Approvals | ATEX, FM, CSA C/US, IEC Ex, TIIS, INMETRO, NEPSI |
| Specialities | Commissioning with ReadWin2000 |
| Components | Density Computer FML621 |
| Other approvals and certificates | SIL2/ SIL3 |
Point Level / Liquids
| Measuring Principle | Vibration Liquids |
| Characteristic / Application | Modular housing concept wide range of process connections Analogue and bus interfaces Extensive certificate range (e.g. Ex,WHG) pipe extension up to 3m (6m option) |
| Specialities | Foamdetection Detect a densitychange second line of defense |
| Supply / Communication | PROFIBUS PA 19...253V AC 10...55V DC-PNP 19...253V AC or 10...55V DC 8/16mA, 11...36V DC NAMUR PFM |
| Ambient temperature | -50 °C...+70 °C (-58 °F...+158 °F) |
| Process temperature | -50 °C...+150 °C (-58 °F...+302 °F) |
| Process pressure / max. overpressure limit | Vacuum...100 bar |
| Min. density of medium | 0.5g/cm³(0.4g/cm³ optional) |
| Main wetted parts | 316L / Alloy |
| Process connection | Thread: G3/4A, G1A, R3/4", R1, NPT3/4, NPT1 Flange: DN25...DN100, ASME 1"...4", JIS 25A...100A |
| Process connection hygienic | Tri-Clamp ISO2852 |
| Sensor length | Length 130mm (5.12") (Liquiphant II) 148mm...6000mm (5.83"...236") |
| Communication | PROFIBUS PA 19...253V AC 10...55V DC-PNP 19...253V AC bzw 10...55V DC 8/16mA, 11...36V DC NAMUR PFM |
| Certificates / Approvals | ATEX, FM, CSA C/US, IEC Ex, TIIS, INMETRO, NEPSI |
| Safety approvals | SIL2/ SIL3 |
| Design approvals | EN 10204-3.1 NACE MR0175, MR0103 ASME B31.3 AD2000 |
| Marine approval | GL/ ABS/ DNV |
| Options | Heavy duty stainless steel housing mainly for the oil and gas industry |
| Components | FTL325P/FTL375P Interface PFM FTL325N/FTL375N Interface NAMUR |
| Successor | Liquiphant FTL51B |
The Liquiphant FTL51 vibronic limit switch is equipped with an extension pipe, can be used in hazardous areas, has obtained various international approvals and is suitable for all industries. FTL51 achieves SIL2/SIL3 functional safety, and the second line of defense ensures the highest degree of safety and availability. The measured value is stable and unaffected by flow, turbulence, bubbles, foam, vibration, solids content or buildup.
Benefits
Can be used in safety systems requiring SIL2/SIL3 functional safety in accordance with IEC 61508/IEC 61511-1
Various process connections available
Various electronic insert types, such as NAMUR, relay, semiconductor thyristor and PFM signal output, for connection to various process control systems
PROFIBUS PA communication protocol also available
No calibration required: fast, economical device startup
No mechanically moving parts, no maintenance, no wear, long service life. Fork breakage monitoring ensures correct function
FDA-approved materials (PFA Edlon)
Application
Limit switch with extension pipe, suitable for detecting all types of liquids:
Process connection: thread, flange and hygienic process connections (clamp)
Temperature: -50 ~ +150°C (-58 ~ +302°F)
Pressure: -1 ~ +100 bar (-14.5 ~ +1,450 psi)
Sensor material: 316L, Alloy
International explosion protection approval, WHG overflow protection, SIL
Spare Parts & Accessories 91
91 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| 52002698 | Aluminum coverO-ring EPDM for Aluminium housing F13, Ex d | Details |
| 52002699 | Aluminum coverO-ring EPDM for Aluminium housing F17 | Details |
| 52006903 | Aluminum coverO-ring EPDM for Aluminium housing Liquiphant M/S, Liquicap M, Soliphant M | Details |
| 52025606 | plastic coverGasket EPDM Polyester housing | Details |
| 52025790 | Transparent coverGasket EPDM Polyester housing | Details |
| 52027000 | Stainless Steel CoverGasket 67,5x2,9x1,5 VMQ/PTFE Stainless steel housing F15 | Details |
| 52027002 | Window cover with gasketSight glass: glass Gasket 67,5x2,9x1,5 VMQ/PTFE Stainless steel housing F15 | Details |
| 52028207 | Window cover with gasketSight glass: Polycarbonat PC Gasket 67,5x2,9x1,5 VMQ/PTFE for use in non-hazardous area (EEx ia) Stainless steel housing F15 | Details |
| 71114754 | CoverMaterial: 316L. O-ring 70.0x3.0 EPDM. Usage: stainless steel housing F27, FTL50/FTL51/FTL51C, FTL70/FTL71, FTL80/FTL81/FTL85. | Details |
| 943461-0000 | Cover F16 (KT73) grey, PBTPUsage: Housing F16 Polyester. | Details |
| 52004236 | AdapterFixing set, consists of: securing ring 301 adapter ring PPA Liquiphant M/Liquiphant S | Details |
| 52004137 | O-ringCover seal set Polyester housing F16 | Details |
| 52004277 | Seal kitconsists of: 10x O-ring 70,0x3,0 EPDM | Details |
| 52008495 | Seal kitfor cover | Details |
| 52028179 | gasketProfile gasket for cover Stainless steel housing F15 | Details |
| 71114756 | Seal kitConsists of: 5x O-ring 70.0x3.0 FVQM. Usage: FTL50/FTL51/FTL51C, FTL70/FTL71, FTL80/FTL81/FTL85. | Details |
| 52002447 | cable entryconsists of: adapter M20 > G1/2, 304 gasket NBR blind plug G1/2 Cerabar M, Liquiphant M | Details |
| 52002448 | cable entryconsists of: adapter M20 > NPT1/2, 304 gasket NBR plug NPT1/2 Cerabar M, Liquiphant M | Details |
| 52002450 | cable entryconsists of: adapter M20 > Pg13.5, 304 gasket NBR blind plug Pg13.5 Cerabar M, Liquiphant M | Details |
| 52004133 | Adapterfor Polyester housing F16 | Details |
Configurator / Comparison
Measuring Principle Video
Click to playSource:Endress+Hauserwebsite public information
Manuals & Documents 9
All documents for this model9 documents · click to expand
Liquiphant M/S FTL50, FTL51, FTL50H, FTL51H, FTL51C, FTL70, FTL71 Electronic insert FEL50A PA English
TI 焊接接头、过程转接头和法兰 Chinese
技术资料 Liquiphant M FTL50(H), FTL51(H) Chinese
技术资料 Liquiphant M FTL50(H), FTL51(H) Chinese
技术资料 Liquiphant M FML621 Chinese
TI Weld-in adapter, process adapter and flanges English
Liquiphant M FTL50, FTL51, FTL50H, FTL51H Technical Information English
Technical Information Liquiphant M Density and Density Computer FML621 English
Liquiphant M Density FEL50D Technical Information English
Product Videos
Case Studies
Municipal Wastewater Treatment · tuning fork — Application Case
Site Conditions
This is a Municipal Wastewater Treatment customer whose plant is at the inlet, biological and outlet stages of a municipal plant. The main task was vibrating-fork point level detection and high/low alarms.
The Problem
The difficulty lies in high solids and corrosive fractions, with large diurnal flow swings; at the same time effluent parameters drift and probes foul with sludge and biofilm. Specification therefore means choosing fork length and surface finish by density and stickiness.
What We Did
We took a level range approach — level solution matched to the actual tank and silo geometry. Delivery was built around choosing fork length and surface finish by density and stickiness, with point-by-point checks on: stable compliance with Grade 1A discharge limits and online data reporting.
Operating Outcome
In service the system performs as intended — no calibration needed, with dependable switching, with routine maintenance falling noticeably.
Food & Beverage · tuning fork — Application Case
Application Context
dosing, pasteurising, filling and CIP stages is a typical Food & Beverage duty. The project started from tuning fork, focusing on vibrating-fork point level detection and high/low alarms.
Process Constraints
frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles, and syrups, dairy and beverages that scale easily, under strict hygienic requirements only amplify it. The tuning fork specification must therefore cover choosing fork length and surface finish by density and stickiness.
Delivery Approach
Delivery was handled as the level range — level solution matched to the actual tank and silo geometry. Execution centred on choosing fork length and surface finish by density and stickiness, together with food-safety and hygienic design per 3-A / EHEDG.
Field Results
Operation shows the benefit clearly — no calibration needed, with dependable switching, with confidence in this measuring point improving markedly.
Chemical & Pharmaceutical · tuning fork — Application Case
Customer Profile
The typical setting in Chemical & Pharmaceutical is reactors, metering vessels and finished-product tanks. The measuring point is tuning fork; the focus is vibrating-fork point level detection and high/low alarms.
Key Difficulties
Conditions are highly corrosive media with solvents and crystallisation, partly in explosive atmospheres and, on top of that, corrosion plus Ex protection shortens instrument life and makes downtime costly, which a standard configuration cannot handle for long. The design therefore starts with choosing fork length and surface finish by density and stickiness.
Implementation
The scope ran through the level range: level solution matched to the actual tank and silo geometry. Technically it hinges on choosing fork length and surface finish by density and stickiness, and on these requirements: Ex certification and GMP traceability of records.
Customer Benefit
In practice this means no calibration needed, with dependable switching, which cut the workload on the site maintenance team.
Power & Energy · tuning fork — Application Case
Project Background
The project covers boiler feedwater, turbine condensate and FGD/DeNOx systems. The work centres on tuning fork and the core task is vibrating-fork point level detection and high/low alarms.
Operating Challenges
The medium and duty are characterised by high temperature and pressure with both steam and saline water, and drift under high temperature and pressure, with very costly unplanned outages. So tuning fork cannot be specified generically — it calls for choosing fork length and surface finish by density and stickiness.
Solution
The Ainstru engineering team worked through the level range: level solution matched to the actual tank and silo geometry. The configuration involves choosing fork length and surface finish by density and stickiness, with these requirements in view: compliance with power-industry codes and unit availability targets.
Results
Since start-up the system has run steadily; the practical result is no calibration needed, with dependable switching.
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