Capacitive probe for level measurement in liquids
Liquicap T FMI21
Info-Hotline
0 800 343 47 32
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No calibration needed
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Corrosion resistant materials (carbon fiber, stainless steel)
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Safe operation – regardless of tank geometry
Specs at a glance
Function Continuous level measurement Product Conductive liquids as of 30 μS/cm Probe length
150 to 2500 mm (6 to 98")
Process pressure –1 to +10 bar (–14.5 to 145 psi)
Product temperature –40 to +100 °C (–40 to +212 °F) Viscosity Max. 2000 cSt Product / Version Price / pcs. in EUR Order code Approval Electronics; Output Probe Length; Material 1 to 3 4 to 10 11+ Non-hazardous area FEI20; 4-20mA ..... mm L; PP >316L 367,- 341,- 323,- FMI21-A1A1B1 FEI20; 4-20mA + display ..... mm L; PP >316L 408,- 379,- 359,- FMI21-A1A1C1 FEI20; 4-20mA ..... mm L; PP >carbon fiber (<1000mm) 394,- 367,- 347,- FMI21-A1B1B1 FEI20; 4-20mA + display ..... mm L; PP >carbon fiber (<1000mm) 435,- 405,- 383,- FMI21-A1B1C1 FEI20; 4-20mA ..... mm L; PP >carbon fiber (>1000mm) 422,- 392,- 371,- FMI21-A1C1B1 FEI20; 4-20mA + display ..... mm L; PP >carbon fiber (>1000mm) 463,- 430,- 407,- FMI21-A1C1C1 Non-hazardous area, WHG FEI20; 4-20mA ..... mm L; PP >316L 388,- 361,- 342,- FMI21-B1A1B1 FEI20; 4-20mA + display ..... mm L; PP >316L 429,- 399,- 378,- FMI21-B1A1C1 FEI20; 4-20mA ..... mm L; PP >carbon fiber (<1000mm) 416,- 387,- 366,- FMI21-B1B1B1 FEI20; 4-20mA + display ..... mm L; PP >carbon fiber (<1000mm) 457,- 425,- 402,- FMI21-B1B1C1 FEI20; 4-20mA ..... mm L; PP >carbon fiber (>1000mm) 444,- 413,- 390,- FMI21-B1C1B1 FEI20; 4-20mA + display ..... mm L; PP >carbon fiber (>1000mm) 485,- 451,- 426,- FMI21-B1C1C1 Accessories
Product / Version Price / pcs. in EUR Order code Mounting nut G1-1/2 Hexagon, SW60. Usage: Liquipoint T, Liquicap T, Prosonic M FMU40, Prosonic T FMU30, FMR10, FMR20. 22,52 52014146 Shorting kit FMI21 Usage: Liquicap T. 7,69 52024300 Digital display, holder 4-digit + 0-100% bargraph display. Holder. Please order high transparent cover separately. Usage: FMI21. 110,02 52025604 Cover F16 high, transparent, gasket Display cover, gasket EPDM. Usage: housing Polyester, FMI21, FMI51/FMI52, FMU30. 30,92 52025605 Prices valid until 31.12.2019 in EUR per unit (not including shipping and applicable sales tax). See
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Application
The Liquicap T FMI21 sensor is used in conductive liquids for continuous level measurement. The Liquicap T FMI21 is particularly suited to small measuring tanks and works independently of the tank's shape or material (plastic, stainless steel, concrete...).
It is resistant to aggressive liquids like acids or alkalis.
Function
The probe and medium form an electric capacitor. If the probe is in air, a certain low initial capacitance is measured. When the tank is filled, the capacitance increases the more the probe is covered. The electronic insert of the probe converts the capacitance measured to a 4 to 20 mA signal in proportion to the level.
Application example
The measuring system consists of:
- The Liquicap T FMI21 capacitance probe (the probe rods should never be in contact with the tank) with
- Electronic insert FEI20
- Display and housing cover (optional)
- A transmitter power supply unit RN221N, RMA42, RTA421, RIA45/RIA46 or RIA452
a) Factory calibration
b) Transmitter power supply
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Technical Data
InputMaximum viscosity 2000 cSt Measuring range 0 pF to 2000 pF Probe length 150 to 2500 mm (5.9 to 98.43”) Permitted span ∆C = 10 pF to 2000 pF Measuring frequency 250 kHz Input signal Probes covered => high capacitance
Probes exposed => low capacitance
Output (electronic insert FEI20 / 4 to 20 mA)Output signal 3.8 to 20.5 mA Switch-on current max. 20 mA (< 500 ms) Signal on alarm > 21 mA Power supplyConnection voltage U = 10 to 30 V DC, Reverse polarity protection (integrated) Power consumption P < 0.7 W Current consumption I < 22 mA Cable entries M20×1.5 (screw connection) Performance characteristics (with installed electronic insert)Reference operating conditions Ambient temperature 23 °C (74 °F), atmospheric pressure, probe installation vertical from above Max. measured error ≤ 1 % of full scale value Repeatability 0.25 % of full scale value Start-up settling time < 2 s Influence of ambient temperature < 0.01 %/K (–40 to +70 °C/–40 to +158 °F) probe length 1 m Integration time 1 s Calibration In an installed state, recalibration is only necessary if:
- the 0 % and 100 % value should be adjusted to suit customer specifications
- after the probe rods have been shortened
Operating conditionsAmbient temperature –40 to +70 °C (–40 to +158°F) Storage temperature –40 to +80 °C (–40 to +176°F) Climate class Tropicalized as per DIN IEC 68 Part 2-38 Degree of protection IP 66 Shock resistance DIN EN 60068-2-27/IEC 68-2-27: 30g Vibration resistance DIN EN 60068-2-64/IEC 68-2-64: 20 to 2000 Hz, 1 (m/s²)² /Hz (with min. rod length 150 mm) EMC Interference emission to EN 61326, electrical equipment class B; Interference immunity to EN 61326, annex A (industrial) Conductivity of medium ≥30 µS/cm Process pressure –1 to +10 bar (–14.5 to 145 psi) Process temperature –40 to +100 °C (–40 to +212 °F) Lateral loading capacity 2 Nm Materials in contact with mediumProbe rods Rod: 1.4404/316L; Optional: carbon fiber CFC; Sealing ring: EPDM; Insulation: PP; Spacer: PP Process connections G1½ A (PPS, DIN ISO 228/l) Seals Sealing ring for process connection G1½ A: Elastomer fiber asbestos-free (resistant to oils, solvents, steam, weak acids and alkalis) DisplayGreen LED operational status (slow flashing), calibration status (fast flashing) Red LED for key enter validation (short flashing), alarm or warning (flashing) Display for measured value in % optional ApprovalsWHG approval Overspill protection to §19 WHG (Germany) Dimensions (in mm)
a) Ground rod (uninsulated)
b) Probe rod insulated
L = Probe length
Installation according to operation instructions
Electrical connection
a) Endress+Hauser transmitter power supply
b) Measurement display (optional)
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Technical Datasheet
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