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Radar measurement
Micropilot FMR540

Micropilot FMR540 horn antenna ©Endress+Hauser
Micropilot FMR540 parabolic antenna ©Endress+Hauser

Time-of-Flight measuring principle

Horn antenna and parabolic antenna for custody transfer applications

Micropilot FMR540 is used for custody transfer and inventory control applications with NMi- and PTB-approvals and meets the requirements according to OIML R85 and API 3.1B. FMR540 with parabolic antenna is particularly suited for free space applications up to 40m and with horn antenna for free space applications that disallow the use of a parabolic antenna due to tank/nozzle geometry. Cost-effective and simple installation via 4-wire cable with HART and 24 V DC intrinsically safe power supply.

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  • Benefits

    • Better than 1mm accuracy

    • National approvals (NMi, PTB) for custody transfer

    • Applicable as stand-alone system or integrated into tank gauging systems via the Tank Side Monitor NRF590

    • Cost-effective and simple installation via 4-wire cable with HART and 24 V...

  • Field of application

    Parabolic antenna suited for free space applications up to 40m offers high beam focusing for applications with nozzle situated close to tank wall, 4"/DN100 horn antenna suited for free space applications.

    • Process connection: Flange

    • Temperature: -40 to +...

Features and specifications



  • Measuring principle

    Level radar

  • Characteristic / Application

    Horn antenna:
    High precision measurement for for storage tanks up to 20 m (65ft)

    Parabolic antenna:
    High precision measurement for free space applications up to 40 m (131 ft)

  • Supply / Communication

    4-wire (HART)

  • Frequency

    K-band (~26 GHz)

  • Accuracy

    +/- 1 mm

  • Ambient temperature

    For calibration to regulatory standards:

  • Process temperature


  • Process pressure absolute / max. overpressure limit

    Horn: Vacuum...16 bar (232 psi)
    Parabolic: Vacuum...6 bar (87 psi)
    Use of UNIflange: Vacuum...1 bar (14.5 psi)

  • Main wetted parts


  • Process connection

    Horn Antenna: DN100, DN150 Flange
    UNIFlange DN150, DN200, DN250
    Parabolic antenna: UNIflange with Top Target
    positioner DN200, DN250

    For dk value < 1.9, contact Endress+Hauser

  • Application


  • Max. measurement distance

    Max. measurement distance

  • https://portal.endress.com/picpool/sft/prodcont/technicalinfo/Radar_Mediengruppe_en.jpg
  • Communication

    4...20 mA HART

  • Certificates / Approvals


  • Application limits

    Maximum measuring range is dependent on the tank form and/or application

    Strong condensate or build-up formation

    Existing stilling wells with non-ideal measuring conditions

Documents / Manuals / Software

Accessories / Spare parts

Order code
  • 20
    • Nr 20 Order code 52005936

      Cover F12/T12 Alu, window, gasket

      Material: aluminium. Usage: VU331, housing F12/T12, Micropilot M/S, Prosonic M, Levelflex M.

  • 25
    • Nr 25 Order code 518710-0020

      Cover T3/T12 Alu, coated, gasket

      Material: aluminium, coated. O-ring EPDM. Usage: FMR230/FMR231,FMR240/FMR244/ FMR245, FMR250, FMR530/FMR531/FMR532/ FMR533, FMR540, FMU40/FMU41/FMU42.

  • 35
    • Nr 35 Order code 71020581

      Terminal module 5-pole, Ex i, FMR53x/540

      Usage: FMR530/FMR532/FMR533, FMR540.

    • Nr 35 Order code 71020582

      Terminal module 5-pole, Ex d, FMR540

      Usage: FMR540.

  • 40
    • Nr 40 Order code 52026443

      Display VU331, version 2

      Alphanumeric display, 4-line. Usage: FMR530/532/533, FMR540, FMU40/41/42/43/44.

  • 30
    • Nr 30 Order code FMR54X1-

      Electronics FMR540, Ex, HART, HF-module

      Usage: FMR540.

  • 55
    • Nr 55 Order code 52025233

      Parabolic reflector 197x25, 316L

      Fixing screws. DN200/8". Usage: FMR250, FMR540.

    • Nr 55 Order code 71020169

      Horn FMR250/540,100mm/4",length 430mm,SS

      Material: 316L. Fixing screws. Usage: FMR250, FMR540.

    • Nr 55 Order code 71090287

      Parabolic reflector 173x60, 316L

      Fixing screws. DN200/8". Usage: FMR57, FMR540.

    • Nr 55 Order code 71090289

      Parabolic reflector 236x88, 316L

      Fixing screws. DN250/10". Usage: FMR540, FMR57.

    • Order code 52007441

      Adapter cable FMR2xx/53x, FMU4x, FMP4x

      Connection > adapter. Service tool RS232 (016154-0000). To use the ToF-Tool software Micropilot M, Micropilot S, Prosonic M, Levelflex M.

    • Order code 52007646

      Tool for unplugging the antenna cable

      Usage: Micropilot M/Micropilot S.

    • Order code 71007843

      ToF Adapter FXA291

      Usage: connection Micropilot M, Micropilot S, Levelflex M, Prosonic M, Tank Side Monitor, Deltabar S, Cerabar S, Gammapilot M, Micropilot I, to Commubox FXA291.

    • Order code 71006590

      HF-test cable 6GHz

      Coax cable. Usage: FMR230/FMR231, FMR530/FMR531/FMR532/FMR533, FMR540. Dummy antenna.

    • Order code 52028063

      HF-test cable 6GHz + resistor

      Coax cable. Termination resistor / connection piece. Usage: FMR530/FMR532/FMR533, FMR540. Dummy antenna.

    • Order code 52009925

      HF-test cable 26GHz

      Coax cable. Dummy antenna. Usage: FMR240/FMR244/FMR245/FMR250, FMR540.

  • 65
    • Nr 65 Order code 52005628

      Sealing kit FMR5xx

      Consists of: 5x O-ring 49.21x3.53 EPDM. 5x O-ring 113.9x3.63 EPDM. 5x O-ring 72.0x3.0 EPDM.

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