Technical Data
CompareContinuous / Liquids
| Measuring Principle | Capacitive |
| Characteristic / Application | Fully insulated rod probe, for standart- and extreme process conditions (temperature, pressure, build-up) |
| Interface measurement | Interfaces liquid / liquid also with emulsion layers |
| Specialities | Inactive length Factory calibrated short response time by change of value |
| Supply / Communication | 12-36V DC HART PFM |
| Accuracy | Repeatablity 0,1% |
| Linearity error for conductive liquids | <0.5% |
| Ambient temperature | -50°C...+70°C -58°F...+158°F |
| Process temperature | -80°C...200°C -112°F...392°F |
| Process pressure / max. overpressure limit | Vacuum ... 100 bar (Vaccum ... 1450 psi) |
| Main wetted parts | Insulation material: PTFE,PFA 316L |
| Process connection | G1/2, G 3/4, G 1, G1 1/2 /NPT 1/2, NPT 3/4, NPT 1", NPT1 1/2 Flanges from DN25.../ASME 1".../JIS... |
| Process connection hygienic | Tri-Clamp ISO02852 gap free plated Dairy coupling Flush-mounted seal |
| Sensor length | Total length: 6m (20ft) Inactive length: max. 2m (7ft) |
| Max. measurement distance | 0.1 m ... 4.0 m (0.3 ft ... 13 ft) |
| Communication | 4...20mA HART PFM |
| Certificates / Approvals | ATEX, FM, CSA, IEC Ex, TIIS, INMETRO, NEPSI, EAC |
| Safety approvals | SIL |
| Design approvals | EN 10204-3.1 NACE MR0175 |
| Hygienic approvals | 3A, EHEDG |
| Marine approval | GL/ ABS/ DNV |
| Options | Separate housing gas-tight probe seal |
| Application limits | Insufficient clearance towards ceiling Changing, non-conductive media, conductivity < 100 μS/cm Notice the pressure and temperature derating |
The FMI51 is the rod version. If a cable capacitive level transmitter is required, use the FMI52. For measuring light solids, use the FTC260.
The Liquicap FMI51/FM151 is a fully insulated rod probe for level monitoring in a wide range of liquids, and it also measures effectively in media prone to buildup and at extremely high temperatures. The measurement is unaffected by the dielectric constant (DC). Used together with the Fieldgate FXA320 (remote reading of measured values via Internet technology), Liquicap is the ideal choice for inventory management solutions.
Benefits:
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Compliant with IEC 61508, can be used in safety systems up to functional safety level SIL2
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Numerous certificates and approvals for reliable use and a wide range of applications
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No calibration required (factory preset). No calibration is needed when measuring media with a conductivity of 100 μS/cm and higher
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Process wetted parts made of corrosion-resistant, FDA-approved materials
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Menu-guided on-site configuration via plain text display (optional)
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Two-stage overvoltage protection
Application areas:
The instrument is unaffected by the dielectric constant (DC); liquids have a conductivity of 100 μS/cm, and multiple liquids can be measured without recalibration.
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Process connection: flange and thread
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Process pressure: -1...+100 bar (+1,450 psi)
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Measuring range: 0.1...4.0 m (0.3...13 ft)
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Temperature: -80...+200 °C (-112...+392 °F)
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International explosion protection approval, WHG overflow protection, SIL, hygienic approval, marine approval
Spare Parts & Accessories 52
52 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| 52005984 | plug connectorwith gasket for Aluminium and stainless steel 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 |
| 52025605 | Transparent coverCover for display, polyester housing Gasket EPDM Liquicap T/Liquicap M | Details |
| 52025606 | plastic coverGasket EPDM Polyester housing | 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 |
| 52028269 | cover with viewing windowSight glass: glass Gasket 67,5x2,9x1,5, VMQ/PTFE Stainless steel housing F15 | Details |
| 52028270 | Aluminum coverSight glass: Glass O-ring 70,0x3,0 EPDM Aluminium housing F13/F17 | Details |
| 52028271 | Aluminum coverSight glass: mineral glass individual tested, EEx d/XP O-ring EPDM, FDA 72,0x3,0 Aluminium housing T13 | Details |
| 52007103 | Aluminum coverO-ring EPDM for terminal compartment Aluminium housing T13 | 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 |
| 52028260 | electronic plug-in moduleContinuous 2-wire, 4-20mA Liquicap M FMI51/52 | Details |
| 52028261 | electronic plug-in moduleContinuous 2-wire, PFM Liquicap M FMI51/52 | Details |
| 71020804 | Terminal moduleUsage: FMI51/FMI52, FTI51/FTI52/FTI55/FTI56, FTI77. | Details |
| 52028266 | Digital display with mounting bracket4-line alphanumeric display Liquicap M | Details |
Configurator / Comparison
Measuring principle video
Click to playSource: public information from the Endress+Hauser website
Manuals & Documents 12
All documents for this model12 documents · click to expand
操作手册 Liquicap M FMI51, FMI52 FEI57C PFM Chinese
Liquicap M FMI51, FMI52 FEI50H HART Chinese
Liquicap M FMI51, FMI52 FEI50H HART Chinese
BA Liquicap M FMI51 PFM Chinese
BA Liquicap M FMI51 HART Chinese
Liquicap M FMI51, FMI52 FEI57C PFM Operating Instructions English
Operating Instructions Liquicap M FMI51, FMI52 FEI50H HART English
Liquicap M FMI51, FMI52 Operating Instructions PFM English
Liquicap M FMI51, FMI52 Operating Instructions HART English
Liquicap M FMI51 PFM English
Liquicap M FMI51 HART English
TI 焊接接头、过程转接头和法兰 Chinese
Product Videos
Case Studies
Municipal Wastewater Treatment · capacitors — Application Case
Customer Profile
The typical setting in Municipal Wastewater Treatment is the inlet, biological and outlet stages of a municipal plant. The measuring point is capacitors; the focus is capacitive sensing of level, interface or point limit.
Key Difficulties
Conditions are high solids and corrosive fractions, with large diurnal flow swings and, on top of that, effluent parameters drift and probes foul with sludge and biofilm, which a standard configuration cannot handle for long. The design therefore starts with choosing rod, cable or plate probes by dielectric constant and build-up tendency.
Implementation
The scope ran through the level range: level solution matched to the actual tank and silo geometry. Technically it hinges on choosing rod, cable or plate probes by dielectric constant and build-up tendency, and on these requirements: stable compliance with Grade 1A discharge limits and online data reporting.
Customer Benefit
In practice this means reliable detection despite build-up, with far fewer false alarms, which cut the workload on the site maintenance team.
Food & Beverage · capacitors — Application Case
Project Background
The project covers dosing, pasteurising, filling and CIP stages. The work centres on capacitors and the core task is capacitive sensing of level, interface or point limit.
Operating Challenges
The medium and duty are characterised by syrups, dairy and beverages that scale easily, under strict hygienic requirements, and frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles. So capacitors cannot be specified generically — it calls for choosing rod, cable or plate probes by dielectric constant and build-up tendency.
Solution
The Ainstru engineering team worked through the level range: level solution matched to the actual tank and silo geometry. The configuration involves choosing rod, cable or plate probes by dielectric constant and build-up tendency, with these requirements in view: food-safety and hygienic design per 3-A / EHEDG.
Results
Since start-up the system has run steadily; the practical result is reliable detection despite build-up, with far fewer false alarms.
Chemical & Pharmaceutical · capacitors — Application Case
Project Overview
The site is reactors, metering vessels and finished-product tanks. The customer wanted capacitors properly configured on the existing plant, with the aim of capacitive sensing of level, interface or point limit.
Technical Challenges
What actually causes trouble is highly corrosive media with solvents and crystallisation, partly in explosive atmospheres, and corrosion plus Ex protection shortens instrument life and makes downtime costly. All of this means the capacitors configuration has to involve choosing rod, cable or plate probes by dielectric constant and build-up tendency.
Configuration
Supply and installation were organised through the level range: level solution matched to the actual tank and silo geometry. On site this meant choosing rod, cable or plate probes by dielectric constant and build-up tendency, checked line by line against: Ex certification and GMP traceability of records.
Performance
After commissioning the outcome is reliable detection despite build-up, with far fewer false alarms, and the readings are now used for process tuning.
Power & Energy · capacitors — Application Case
Site Conditions
This is a Power & Energy customer whose plant is at boiler feedwater, turbine condensate and FGD/DeNOx systems. The main task was capacitive sensing of level, interface or point limit.
The Problem
The difficulty lies in high temperature and pressure with both steam and saline water; at the same time drift under high temperature and pressure, with very costly unplanned outages. Specification therefore means choosing rod, cable or plate probes by dielectric constant and build-up tendency.
What We Did
We took a level range approach — level solution matched to the actual tank and silo geometry. Delivery was built around choosing rod, cable or plate probes by dielectric constant and build-up tendency, with point-by-point checks on: compliance with power-industry codes and unit availability targets.
Operating Outcome
In service the system performs as intended — reliable detection despite build-up, with far fewer false alarms, with routine maintenance falling noticeably.
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