E+H Micropilot FMR540 Radar Level Transmitter

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.

  • 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 DC intrinsically safe power supply
  • Alignment device to compensate any flange inclination
  • Easy on-site operation via menu-driven alphanumeric display
  • Easy commissioning, documentation and diagnostics via operating software (FieldCare)

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 +200°C (-40 to +392°F)
  • Pressure: Vacuum to +16bar (Vacuum to +232psi)
  • Maximum measuring range: 40m (131ft)
  • Accuracy: Better than ±1mm
  • K-band: 26GHz
  • International explosion protection and custody transfer certificates, overfill prevention WHG, SIL
  • 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

    Horn Antenna: 30 m (98 ft)
    NMi and PTB 15 m (49 ft)
    Parabolic antenna: 40 m (131 ft)
    NMi = 25 m (82 ft), PTB = 30 m (98 ft)

  • https://portal.endress.com/picpool/sft/prodcont/technicalinfo/Radar_Mediengruppe_en.jpg https://portal.endress.com/picpool/sft/prodcont/technicalinfo/Radar_all_FMR540.jpg
  • Communication

    4…20 mA HART

  • Certificates / Approvals


  • Safety approvals

    Overfill prevention WHG

  • 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 

Datasheet: Micropilot S FMR540 Technical Information

Tankvision NXA820, NXA821, NXA822

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