Technical Data
ComparePoint Level / Liquids
| Measuring Principle | Vibration Liquids |
| Characteristic / Application | Modular housing concept High process temperatures up to 280°C wide range of process connections Analogue and bus interfaces Extensive certificate range (e.g. Ex,WHG) compact, e.g. pipes Dual Sealing / Second line of defense |
| Specialities | Foamdetection Detect a densitychange second line of defense |
| Supply / Communication | PROFIBUS PA 19...253V AC 10...55V DC-PNP 19...253V AC bzw 10...55V DC 8/16mA, 11...36V DC NAMUR PFM |
| Ambient temperature | -50 °C...+70 °C (-58 °F...+158 °F) |
| Process temperature | -60 °C...+280 °C (-76 °F...+540 °F, (300°C / 572 °F 50h, cumulated |
| Process pressure / max. overpressure limit | Vacuum...100 bar (Vacuum...1450 psi) |
| Main wetted parts | 316L / Alloy PFA and Enamel on request |
| Process connection | Thread: G3/4A, G1A, R3/4", R1, NPT3/4, NPT1 Flange: DIN DN25...DN100, ASME 1"...4", JIS 25A...100A |
| Sensor length | 65mm (2.56") |
| 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 | SIL |
| Design approvals | EN 10204-3.1 NACE MR0175, MR0103 ASME B31.3 AD2000 |
| Marine approval | GL/ ABS |
| Options | Heavy duty stainless steel housing mainly for the oil and gas industry |
| Components | FTL325P/FTL375P Interface PFM FTL325N/FTL375N Interface NAMUR |
The Liquiphant FTL70 vibronic point level switch can be used in hazardous areas and has various international approvals. The FTL70 is especially suitable for high-temperature applications up to 280 °C, with functional safety up to SIL2 and up to SIL3 with homogeneous redundancy. 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
Welded, hermetically sealed feedthrough ensures maximum safety even if the sensor is damaged
Various electronic inserts, such as NAMUR, relay, semiconductor thyristor, PFM signal output, for connection to various process control systems
Various process connections available
No calibration required: fast and economical device startup
No mechanical moving parts, no maintenance, no wear and a long service life. The fork can be monitored for damage to ensure proper function
FDA-listed material (PFA Edlon)
Application areas
Limit switch for detection of all types of liquids.
Process connection: thread and flange
Temperature: -60 ～ +280 °C (-76 ～ +540 °F)
Pressure: -1 ~ +100 bar (-14.5 ~ +1,450 psi)
Sensor material: 316L, Alloy (PFA and enamel optional on request)
International explosion protection approval, WHG overflow protection, marine approval, SIL
Spare Parts & Accessories 34
34 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 |
| 52006903 | Aluminum coverO-ring EPDM for Aluminium housing Liquiphant M/S, Liquicap M, Soliphant M | Details |
| 71114754 | CoverMaterial: 316L. O-ring 70.0x3.0 EPDM. Usage: stainless steel housing F27, FTL50/FTL51/FTL51C, FTL70/FTL71, FTL80/FTL81/FTL85. | 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 |
| 71114756 | Seal kitConsists of: 5x O-ring 70.0x3.0 FVQM. Usage: FTL50/FTL51/FTL51C, FTL70/FTL71, FTL80/FTL81/FTL85. | 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 |
| 52002448 | cable entryconsists of: adapter M20 > NPT1/2, 304 gasket NBR plug NPT1/2 Cerabar M, Liquiphant M | Details |
| 52004278 | cable glandconsists of: cable gland M20 O-ring FKM, plug Pg11 PA | Details |
| 71185029 | cable glandConsists of: cable gland M20, metal. O-ring 17.0x2.0 EPDM + PTFE/FDA. Usage: stainless steel housing F15, FTL50/FTL50H/FTL51/FTL51C/FTL51H, FTL70/FTL71, FTL80/FTL81/FTL85. | Details |
| 52007103 | Aluminum coverO-ring EPDM for terminal compartment Aluminium housing T13 | Details |
| 52005977 | LubricantLubricant "SYNTHESO GLEP1" (tube a 8g) | Details |
Configurator / Comparison
Measuring principle video
Click to playManuals & Documents 4
All documents for this model4 documents · click to expand
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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