Technical Data
CompareDensity
| Measuring Principle | Vibration Density |
| Characteristic / Application | Premium device for density measurement in hygienic/aseptic applications. Focus Food & Beverage and Life Sciences. Sensor with pipe extension up to 3 m (9,85 ft). Modular housing or completely welded compact housing. Wide range of certificates. |
| Supply / Communication | via density controller FML621 |
| Ambient temperature | -40 °C...70 °C (-40...158 °F) |
| Process temperature | 0...80 °C (32…176 °F) |
| Process pressure | 0...25 bar (0…362 psi) |
| Wetted parts | 316L |
| Hygienic | 3A EHEDG |
| Sensor length | Short tube (Liquiphant II) 148mm…3000mm (6,00…118") |
| Output | Pulse |
| Certificates / Approvals | ATEX, FM, CSA C/US, IEC Ex, TIIS, INMETRO, NEPSI |
| Specialities | Density/Concentration measurement in combination with density controller FML621, Surface finish: mechanical polished (up to 0.3 µm) |
| Components | Density Computer FML621 |
Point Level / Liquids
| Measuring Principle | Vibration Liquids |
| Characteristic / Application | Premium device for point level detection in hygienic/aseptic applications. Focus Food & Beverage and Life Sciences. Pipe extension up to 3 m (9,85 ft). Modular & completely welded housing concept, Wide range of certificates. |
| Specialities | Plug and play functionalities, Surface finish: mechanical or electro-polished, Density/Concentration measurement, SIL 2/3 according to IEC 61508 |
| Supply / Communication | PROFIBUS PA, 19 ..253V AC, 10...55V DC-PNP, 19...253V AC or 19...55V DC with relay DPDT, 8/16mA, 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...64 bar (Vacuum...928 psi) |
| Min. density of medium | 0.5g/cm³ (0.4g/cm³ optional) |
| Main wetted parts | 316L |
| Process connection | Threads (for weld-in adapter): G3/4A, G1A, Flange: DN25...DN100, ASME 1"...4", JIS 25A...100A |
| Process connection hygienic | Tri-Clamp, DIN 11851, DIN11864-1 Ingold, Flush mount, DRD, SMS1145, Varivent (Varinline) |
| Sensor length | Short tube (Liquiphant II) 148mm…3000mm (6,00…118") |
| Communication | PROFIBUS PA |
| Certificates / Approvals | ATEX, IEC Ex, FM, CSA C/US, TIIS, INMETRO Ex, NEPSI Ex |
| Safety approvals | Overfill protection WHG, SIL 2/ SIL 3 |
| Design approvals | Inspection certificate 3.1, EN10204, CoC ASME BPE, Conformity to cGMP, EU Food Contact Material (EC) 1935/2004, US Food Contact Material FDA CFR 21, CN Food Contact Material GB 4806, Declaration of Conformity ASME B31.3, AD2000, CRN approval |
| Hygienic approvals | 3-A, EHEDG, CoC-ASME BPE |
| Marine approval | GL/ ABS/ DNV |
| Options | Customized settings (Density) |
| Components | FTL325P/FTL375P Interface PFM FTL325N/FTL375N Interface NAMUR |
| Successor | FTL63 |
The Liquiphant FTL51H vibronic point level switch with extension tube can be used in hazardous areas and has various international approvals. With hygienic certifications such as 3-A, EHEDG and ASME BPE, it is especially suitable for the food and life sciences industries. The FTL51H achieves SIL2/SIL3 functional safety, and the second line of defense ensures the highest degree of device safety and availability. The measured value is stable and unaffected by flow, turbulence, bubbles, foam, vibration, solids content or buildup.
Benefits
Suitable for safety systems requiring SIL2/SIL3 functional safety, in accordance with IEC 61508/IEC 61511-1
Various process connections available
Various electronic inserts, such as NAMUR, relay, semiconductor thyristor, PFM signal output, for connection to various process control systems
Also available with PROFIBUS PA communication protocol
No calibration required: fast and economical device startup
No mechanical moving parts, no maintenance, no wear and a long service life. Fork damage can be monitored to ensure proper function
FDA-listed material (PFA Edlon)
Application areas
Limit switch with electropolished surface, for detection of all types of liquids.
Process connection: thread, flange and hygienic connections (clamp, milk coupling, aseptic, DRD, SMS, Varivent)
Temperature: -50 ~ +150 °C (-58 ~ +302 °F)
Pressure: -1 ~ +64 bar (-14.5 ~ +928 psi)
Sensor material: 316L
International explosion protection approval, WHG overflow protection, SIL, hygienic approval, marine approval
Spare Parts & Accessories 63
63 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 |
| 52005266 | Stainless Steel CoverFor stainless steel housing 316L. Liquiphant M. | 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 |
| 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 |
| 516734-1000 | Plug connector ISO 4400, 3-pole, NPTF 1/2, PEGasket + screw. | Details |
| 516734-2000 | Plug connector ISO4400 DIN43650 3+PE Pg11Gasket + screw. Usage: FTL50/FTL50H/FTL51/FTL51H. | 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
Source: public information from the Endress+Hauser website
Measuring principle video
Click to playManuals & Documents 11
All documents for this model11 documents · click to expand
Liquiphant M/S FTL50, FTL51, FTL50H, FTL51H, FTL51C, FTL70, FTL71 Electronic insert FEL50A PA English
Liquiphant M FTL 50 H, FTL 51 H Instruction Manual English
Liquiphant M FTL 50 H, FTL 51 H Instruction Manual 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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