Technical Data
CompareDensity
| Measuring Principle | Vibration Density |
| Characteristic / Application | Liquiphant M Density with Density Computer FML621 Temperature and pressure measurement High protection against aggressive media by using antistatic coating 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...80°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...40 bar (with reduced technical data) |
| Wetted parts | ECTFE, PFA and Enamel |
| Sensor length | 115...3000 mm (depends by the covering) |
| Output | Pulse |
| Certificates / Approvals | ATEX, FM, CSA C/US, IEC Ex, TIIS, INMETRO, NEPSI |
| Specialities | Commissioning with ReadWin2000 |
| Components | Density Computer FML621 |
| Measuring range | Density range: 0.3 to 2 g/cm³ |
| Other approvals and certificates | SIL2/ SIL3 |
Point Level / Liquids
| Measuring Principle | Vibration Liquids |
| Characteristic / Application | High protection against aggressive media by using antistatic coating 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 Detekt a densitychange second line of defense |
| Supply / Communication | PROFIBUS PA 19...253V AC, 2-wire 10...55V DC-PNP, 3-wire DPDT, 19...253V AC, 10...55V DC 8/16mA, 11...36V DC NAMUR PFM, 2-wire NAMUR with testbutton |
| Ambient temperature | -50 °C...+70 °C (-58 °C...+158 °F) |
| Process temperature | -50 °C...+150 °C (-58 °F...+302 °F) up to 230 °C / 450°F on request |
| Process pressure / max. overpressure limit | Vacuum...40 bar (Vacuum...580 psi) |
| Min. density of medium | 0.5g/cm³ (0.4g/cm³ optional) |
| Main wetted parts | ECTFE PFA (Edlon) PFA (Rubyred) PFA (conductive) Enamel |
| Process connection | Flange: DN25...DN100, ASME 1"...3", JIS RF10 K 50 |
| Process connection hygienic | FDA conform with PFA (Edlon) |
| Sensor length | ECTFE, PFA 130mm, 148mm...3000mm (ECTFE, PFA 5.12", 5.83"...118") Enamel 130mm, 148mm...1200mm (Enmal 5.12", 5.83"...47.24") |
| 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 |
| 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 |
The Liquiphant FTL51C vibronic point level switch features a highly corrosion-resistant coating and an extension tube, can be used in hazardous areas, has various international approvals and is suitable for all industries. The FTL51 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 with SIL2/SIL3 functional safety requirements in accordance with IEC 61508/IEC 61511-1
Various corrosion-resistant coatings for optimum adaptation to process requirements
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 corrosion-resistant coating, for detection of all types of liquids
Process connection: flange and hygienic process connection (FDA-approved PFA)
Temperature: 50 ~ +150 °C (-58 ~ +302 °F)
Pressure: -1 ~ +40 bar (-14.5 ~ +580 psi)
Sensor material: ECTFE, PFA (Edlon, Rubyred, conductive), enamel
International explosion protection approval, WHG overflow protection, SIL, hygienic approval and marine approval
Spare Parts & Accessories 37
37 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| 52025606 | plastic coverGasket EPDM Polyester housing | Details |
| 52025790 | Transparent coverGasket EPDM Polyester housing | Details |
| 52002698 | Aluminum coverO-ring EPDM for Aluminium housing F13, Ex d | Details |
| 52002699 | Aluminum coverO-ring EPDM for Aluminium housing F17 | 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 |
| 52027002 | Window cover with gasketSight glass: glass Gasket 67,5x2,9x1,5 VMQ/PTFE Stainless steel housing F15 | Details |
| 52005266 | Stainless Steel CoverFor stainless steel housing 316L. Liquiphant M. | Details |
| 52027000 | Stainless Steel CoverGasket 67,5x2,9x1,5 VMQ/PTFE 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 |
| 52006903 | Aluminum coverO-ring EPDM for Aluminium housing Liquiphant M/S, Liquicap M, Soliphant M | 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 |
| 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 |
| 52008495 | Seal kitfor cover | Details |
| 52004133 | Adapterfor Polyester housing F16 | Details |
| 52004134 | Adapterfor Polyester housing F16 | Details |
| 52004135 | Adapterfor Polyester housing F16 | Details |
| 52002447 | cable entryconsists of: adapter M20 > G1/2, 304 gasket NBR blind plug G1/2 Cerabar M, Liquiphant M | Details |
Configurator / Comparison
Source: public information from the Endress+Hauser website
Measuring principle video
Click to play8 documents · click to expand
Liquiphant M/S FTL50, FTL51, FTL50H, FTL51H, FTL51C, FTL70, FTL71 Electronic insert FEL50A PA English
技术资料 Liquiphant M FML621 Chinese
技术资料 Liquiphant M FTL51C Chinese
音叉限位开关 Chinese
Liquiphant M FTL51C Technical Information English
Technical Information Liquiphant M Density and Density Computer FML621 English
Liquiphant M FTL51C Technical Information 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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