Technical Data
ComparePoint Level / Solids
| Measuring Principle | Vibration Solids |
| Characteristic / Application | Compact point level switch for fine grained solids and powder Grain size <= 10 mm (<= 0.39 in) Fork sensor No calibration required Not affected by build-up or external vibration Robust Switch value visible from outside |
| Specialities | Build-up and corrosion detection Remote version 3 temperature versions available SIL 2 |
| Supply / Communication | 10-55V DC PNP 3-wire 19-253V AC 2-wire 19...253V AC / 19V...55V DC 2 relay contact 8/16mA NAMUR PFM |
| Ambient temperature | -50°C ... 70°C (-60°F ... 160 °F) |
| Process temperature | -50°C ... 280°C (-60°F ... 540°F) |
| Process pressure / max. overpressure limit | Vacuum ... 25 bar (Vacuum ... 360 psi) |
| Min. density of medium | Standard fork: 10 g/l Short fork: 50 g/l |
| Main wetted parts | selectable: 316L 3,2um 316L 0,8um 316L PTFE coated (to avoid build-up) 316L ETFE coated (to avoid corrosion) |
| Process connection | Thread R 1 1/2" 1 1/4" NPT 1 1/2" NPT EN Flange DN50...DN100 ASME Flange 2"...4" JIS Flange 50A...100A |
| Process connection hygienic | Tri-Clamp ISO2852 |
| Sensor length | Standard: 200mm (8") Short: 145mm (5.7") |
| Communication | DC PNP 2-wire AC Thyristor DPDT relay 8/16mA NAMUR PFM |
| Certificates / Approvals | ATEX, FM, CSA, CSA C/US, IEC Ex, JPN, INMETRO, NEPSI, EAC |
| Safety approvals | SIL |
| Design approvals | EN 10204-3.1 |
| Options | Glass cover Temperature spacer EN10204-3.1 |
| Components | PFM: FTL325P, FTL375P NAMUR: FTL325N, FTL375N |
The Soliphant M FTM50 is a rugged vibronic point level switch for fine solids or low-density, loose bulk powders in silos. It is widely applicable and has international approval for hazardous-area applications with dust and flammable gases. Available options include a polished fork, clamp process connection, stainless steel or aluminum housing and coated fork. The instrument is maintenance-free; typical applications include grain, flour, cocoa beans, sugar, animal feed, dye powder, chalk, etc.
Benefits:
Meets SIL2 in accordance with IEC 61508
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No mechanical moving parts, no maintenance, no wear and a long service life.
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Unaffected by external vibration and buildup, maintenance-free operation, unaffected by bulk solids
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Various electronic inserts such as NAMUR, relay, semiconductor thyristor, PFM signal output for connection to various process control systems
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Optional buildup and wear indication, density setting and switch delay functions
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Sensor available with coating or in polished version
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Market leader in bulk solids level measurement since 1967
Application areas:
Limit switch for detection of fine-grained solids and powders.
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Process connection: thread, flange and hygienic connection (clamp)
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Temperature: -50 ~ +280 °C (-60 ~ +540 °F)
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Pressure: -1 ~ +25 bar (-14.5 ~ +360 psi)
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Sensor length: 145 mm, 200 mm
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Sensor material: 316L (3.2 µm, 0.8 µm, PTFE coating, ETFE coating)
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International explosion protection approval
Commonly used models: FTM50-AGG2A4A32AA FTM50-AGJ2A4A52AA
Spare Parts & Accessories 44
44 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| 52004276 | O-ringGasket sensor/housing F13 Liquiphant M, Soliphant M | Details |
| 52028204 | AdapterFixing set, consists of: securing ring 301, adapter disc Alu, screw M3x12, disc 301 Soliphant M | Details |
| 52004133 | Adapterfor Polyester housing F16 | Details |
| 52004134 | Adapterfor Polyester housing F16 | Details |
| 52004135 | Adapterfor Polyester housing F16 | Details |
| 52025790 | Transparent coverGasket EPDM Polyester housing | Details |
| 52004137 | O-ringCover seal set Polyester housing F16 | Details |
| 52002698 | Aluminum coverO-ring EPDM for Aluminium housing F13, Ex d | Details |
| 52027693 | Aluminum coverO-ring 70,0x3,0 EPDM for Aluminium housing F13/F17/F18 not for EEx d | Details |
| 52002699 | Aluminum coverO-ring EPDM for Aluminium housing F17 | Details |
| 52027000 | Stainless Steel CoverGasket 67,5x2,9x1,5 VMQ/PTFE Stainless steel housing F15 | Details |
| 52027708 | Stainless Steel CoverClaw for cover Gasket 67,5x2,9x1,5 VMQ/PTFE Stainless steel housing F15, approval 2,3,4,8,D,E Soliphant M approval C,D,E,F,H,J,L,M Liquicap M FMI51/FMI52 | Details |
| 52027002 | Window cover with gasketSight glass: glass Gasket 67,5x2,9x1,5 VMQ/PTFE Stainless steel housing F15 | Details |
| 52027709 | Stainless Steel CoverClaw for cover Gasket 67,5x2,9x1,5 VMQ/PTFE Stainless steel housing F15, approval 2,3,4,8,D,E Soliphant M | Details |
| 71185025 | CoverMaterial: 316L. O-ring 70.0x3.0 FVQM. Usage: stainless steel housing F27, FTL80/FTL81/FTL85, FTM50/FTM51/FTM52. | Details |
| 52006903 | Aluminum coverO-ring EPDM for Aluminium housing Liquiphant M/S, Liquicap M, Soliphant M | Details |
| 52028271 | Aluminum coverSight glass: mineral glass individual tested, EEx d/XP O-ring EPDM, FDA 72,0x3,0 Aluminium housing T13 | Details |
| 52004277 | Seal kitconsists of: 10x O-ring 70,0x3,0 EPDM | Details |
| 52028179 | gasketProfile gasket for cover Stainless steel housing F15 | Details |
| 52008495 | Seal kitfor cover | Details |
Configurator / Comparison
Measuring principle video
Click to playSource: public information from the Endress+Hauser website
Manuals & Documents 4
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.
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