Technical Data
ComparePoint Level / Liquids
| Measuring Principle | Vibration Liquids |
| Characteristic / Application | Compact vibronic device with an optional pipe extension up to 2 m; Modular housing concept; Wide range of certificates |
| Specialities | RFID TAG for easy identification, Plug and play functionalities |
| Supply / Communication | 10...55V / DC-PNP 3-wire 19...253V AC or 19...55V DC / relays NAMUR |
| Ambient temperature | -40 °C...+70 °C (-40 °F...+158 °F) |
| Process temperature | -40 °C...+150 °C (-40 °F...+302 °F) |
| Process pressure / max. overpressure limit | Vacuum...40 bar (Vacuum...580 psi) |
| Min. density of medium | 0.5 g/cm³ (0.4 g/cm³ optional) |
| Main wetted parts | 316L |
| Process connection | Threads: G3/4A, G1A, R3/4", R1, NPT3/4, NPT1 Flanges: DN25...DN100 ASME 1"...4" JIS 25A...50A |
| Process connection hygienic | Tri-Clamp ISO2852 |
| Sensor length | Up to 2 m |
| Communication | DC-PNP 3-wire Relays NAMUR |
| Certificates / Approvals | ATEX, IEC Ex, CSA, NEPSI |
| Safety approvals | Overfill protection WHG |
| Design approvals | EN 10204-3.1 ASME B31.3 Process Piping CRN |
| Marine approval | ABS/ LR/ BV/ DNV |
| Components | FTL325N Interface NAMUR |
More than 6 million Liquiphant limit switches have been successfully and reliably in operation worldwide. The design without mechanical moving parts effectively eliminates the risk of mechanical failure and ensures stable operation. In addition, the device does not need to be configured separately for different media.
Advantages
One measuring system meets the measuring requirements of all liquids. No mechanical moving parts, plug-and-play, easy to use
Compared with float level switches, no mechanical moving parts and higher long-term stability
High switch point repeatability
Suitable for all pumpable liquids
Maintenance-free
Application
Limit switch with extension tube, suitable for limit detection of all kinds of liquids.
Process connections: threaded, flanged and hygienic connections (Tri-Clamp)
Temperature range: -40...+150°C (-40...+302°F)
Pressure range: -1...+40 bar (-14.5...+580 psi)
Sensor material: 316L
International explosion protection and WHG approvals
Spare Parts & Accessories 56
56 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| XPF0040- | Liquiphant 2-wire platform housingUsage: FTL41, FTL51B, FTL62, FTL63, FTL64. | Enquire |
| 71432590 | Electronic insert FEL42, PNP 10-55 VDC, 3-wire. Suitable for model: FTL41.3-wire. Usage: FTL41. | Details |
| 71432594 | Electronic plug-in module FEL44, relay DPDT 19-253VAC/19-55VDC, contact19-253VAC/19-55VDC, contact 253V/6A. Usage: FTL41. | Details |
| 71432595 | Electronic module FEL48 NAMUR 2-wire, for NAMUR H-L signal, suitable for model: FTL42-wire, NAMUR H-L signal. Usage: FTL41. | Details |
| 71435116 | Housing cover, aluminum, sealed cover, O-ring, HNBR. Suitable for models: FMG50, FTL41, FTLSealing ring, HNBR. Usage: FMG50, FMR60B, FMR62B, FMR63B, FMR66B, FMR67B, FTL41, FTL51B, FTL62, FTL63, FTL64, PMC51B, PMC71B, PMD55B, PMD75B, PMD78B, PMP51B, PMP71B. | Details |
| 71435118 | Housing cover, aluminum, closed cover, Ex d seal, HNBR. Suitable for: FMG50, FTL4Sealing ring, HNBR. Usage: FMG50, FMR60B, FMR62B, FMR63B, FMR66B, FMR67B, FTL41, FTL51B, FTL62, FTL63, FTL64, NMT81, PMC51B, PMC71B, PMD55B, PMD75B, PMD78B, PMP51B, PMP71B. | Details |
| 71435126 | Housing cover, plastic, sealed cover, O-ring, EPDM. Applicable models: FTL41, FTL51B.Sealing ring, EPDM. Usage: FMR54B, FMR60B, FMR62B, FMR63B, FMR66B, FMR67B, FTL41, FTL51B, FTL62, FTL63, FTL64. | Details |
| 71439089 | Aluminum cover with glass viewing windowSealing ring: HNBR. Sight glass: plastic. Usage: FHX50B, FMG50, FMR60B, FMR62B, FMR63B, FMR66B, FMR67B, FTL41, FTL51B, FTL62, FTL63, FTL64, NMT81, PMC51B, PMC71B, PMD55B, PMD75B, PMD78B, PMP51B, PMP71B, QWX43. | Details |
| 71550061 | Cover, plastic, sight windowSealing ring: EPDM. Sight glass: Polycarbonat. Usage: FHX50B, FMR60B, FMR62B, FMR63B, FMR66B, FMR67B, FTL41, FTL51B, FTL62, FTL64. | Details |
| 71435135 | Cable gland M20, plastic, suitable for models: FTL41, FTL51B, PMC51B, PConsists of: Cable gland, O-ring 17.0 x 2.0 PTFE coated. Usage: FHX50B, FMB70, FMG50, FMR60B, FMR62B, FMR63B, FMR66B, FMR67B, FTL41, FTL51B, FTL62, FTL63, FTL64, PMC51B, PMC71B, PMD50, PMD55B, PMD63B, PMD75B, PMD78B, PMP50, PMP51B, PMP63B, PMP71B. | Details |
| 71435136 | Cable gland M20, nickel-plated brass, suitable for: FMG50, FTL41, FTL51B, PConsists of: Cable gland, O-ring 17.0 x 2.0 PTFE coated. Usage: FHX50B, FMG50, FMR60B, FMR62B, FMR63B, FMR66B, FMR67B, FTL41, FTL51B, FTL62, FTL63, FTL64, PMC51B, PMC71B, PMD55B, PMD75B, PMD78B, PMP51B, PMP71B. | Details |
| 71440660 | M20x1.5-G1/2 adapter, aluminumConsists of: Adapter set, O-ring, 17.0 x 2.0 PTFE coated. Usage: FMG50, FMR60B, FMR62B, FMR63B, FMR66B, FMR67B, FTL41, FTL51B, FTL62, FTL63, FTL64, PMC51B, PMC71B, PMD50, PMD55B, PMD75B, PMD78B, PMP50, PMP51B, PMP71B. | Details |
| 71462833 | M20x1.5-G1/2 adapter, plasticUsage: FTL41, FTL51B, FTL62, FTL63, FTL64. | Details |
| 71462835 | M20x1.5 to 1/2" NPT adapter, plasticUsage: FTL41, FTL51B, FTL62, FTL63, FTL64. | Details |
| 71589844 | Ground terminal LiquiphantConsists of: spring washer, screw, Earth handle, clamp. Usage: Only for switch electronics. Usage: FTL41, FTL51B, FTL62, FTL63, FTL64. | Details |
| 71647970 | Ground terminal, plastic housing, Liquiphant ESConsists of: spring washer, screw, grounding bracket. Usage: Only for switch electronics. Usage: FTL41, FTL51B, FTL62, FTL63, FTL64. | Details |
| 71647972 | Ground terminal, hygienic housing, Liquiph. ESConsists of: spring washer, screw, clamp strap. Usage: Only for switch electronics. Usage: FTL41, FTL51B, FTL62, FTL63, FTL64. | Details |
| 71435131 | Sealing ring EPDM, 5 pcs. Applicable models: FTL41, FTL51B, PMC51B, PMUsage: FHX50B, FMR60B, FMR62B, FMR63B, FMR66B, FMR67B, FTL41, FTL51B, FTL62, FTL63, FTL64. | Details |
| 71435132 | Seal ring HNBR, -40 °C, 5 pcs. Suitable for models: FMG50, FTL41, FTL5Usage: FHX50B, FMG50, FMR60B, FMR62B, FMR63B, FMR66B, FMR67B, FTL41, FTL51B, FTL62, FTL63, FTL64, PMC51B, PMC71B, PMD55B,PMD75B, PMD78B, PMP51B, PMP71B. | Details |
| 71671700 | Locking screw, electronics compartment coverConsists of: 3x screw M4x5 and pin 29,9. Usage: Cover closed, electronics room single and dual compartment, or connection room dual compartment L-shape. Usage: FMG50, FMR60B, FMR62B, FMR63B, FMR66B, FMR67B, FTL41, FTL51B, FTL62, FTL63, FTL64, PMC51B, PMC71B, PMD55B, PMD75B, PMD78B, PMP51B, PMP71B. | Details |
Configurator / Comparison
Measuring principle video
Click to playSource:Endress+Hauserwebsite public information
Manuals & Documents 6
All documents for this modelCase 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.
Related Products
Endress+HauserLiquiphant FTL31
Endress+HauserSoliphant M FTM50
Endress+HauserDensity controller FML621 for Liquiphant
Endress+HauserTuning fork level switch
Endress+HauserSoliphant M FTM51
Endress+HauserSoliphant T FTM20
Endress+HauserSoliphant T FTM21
Endress+Hauser