E+H Micropilot FMR51 Radar Level Transmitter

Micropilot FMR51 for level measurement even under extreme process conditions like high temperature and high pressure in the oil & gas and chemical industry. The FMR51 free space radar offers maximum reliability due to an innovative and patented sensor-design. Micropilot is used for continuous, non-contact level measurement of liquids, pastes, and slurries. The measurement is not affected by changing media, temperature changes, gas blankets or vapors. Remote access via the SmartBlue app is available.

  • Hardware and software developed according to IEC 61508 up to SIL3 (in homogeneous redundancy)
  • HistoROM data management concept for fast and easy commissioning, maintenance and diagnostics
  • Highest reliability even in the presence of obstructions in the vessel due to new Multi-Echo Tracking evaluation
  • Heartbeat Technology for a cost-effective and safe plant operation during the entire life cycle
  • Seamless integration into control or asset management systems and intuitive, menu-guided operation concept (on-site or via the control system)
  • World’s easiest proof test concept for SIL and WHG saves time and cost
  • Highest safety due to double ceramic coupling and gas-tight feedthrough

Horn antenna for level measurement even under extreme conditions.

  • Process connections: Thread, Tri-Clamp or flange
  • Temperature: -196 to +450°C (-321 to + 842°F)
  • Pressure: -1 to +160bar (-14.5 to +2,320psi)
  • Maximum measuring range: 40m (131ft), 70m (230ft) for enhanced dynamics
  • Accuracy: ±2mm
  • K-band: 26GHz
  • International explosion protection certificates, overfill prevention WHG, SIL, marine approvals, 5-point linearity protocol
  • Remote access with SmartBlue App via Bluetooth® is available
  • Measuring principle

    Level radar

  • Characteristic / Application

    Premium device for continuous non-contact level measurement of liquids, pastes and slurries even under extreme process conditions;

    Horn antenna: 40…100 mm

  • Specialities

    Heartbeat Technology,

    SIL 2 according to IEC 61508,

    Bluetooth® commissioning,

    Operation and maintenance SmartBlue App,

    Safety and reliability with Multi-Echo Tracking,


    RFID TAG for easy identification

  • Supply / Communication

    2-wire (HART / PROFIBUS PA/ FOUNDATION Fieldbus)

    4-wire (HART)

    Bluetooth® wireless technology and App (optional)

  • Frequency

    K-band (~26 GHz)

  • Accuracy

    +/- 2 mm (0.08 in)

  • Ambient temperature

    -50…+80 °C

    (-58…+176 °F)

  • Process temperature

    XT: -196…+280 °C

    (-321…+536 °F)

    HT: -196…+450 °C

    (-321…+842 °F)

  • Process pressure absolute / max. overpressure limit

    Vacuum…160 bar 

    (Vacuum…2320 psi)

  • Main wetted parts

    316L, Alloy C, PTFE, ceramic

  • Process connection


    MNPT 1 1/2, R 1 1/2



    ASME 2″…6″,

    JIS 10K, 63K

  • Process connection hygienic

    Tri-Clamp ISO2852

  • Application
  • Max. measurement distance

    Standard: 40 m (131 ft)
    With enhanced dynamics: 70 m (229 ft)

  • https://portal.endress.com/picpool/sft/prodcont/technicalinfo/Radar_Mediengruppe_en.jpg https://portal.endress.com/picpool/sft/prodcont/technicalinfo/Radar_not_selected_storage_tank__FMR51.jpg
  • Communication

    4…20 mA HART 


    FOUNDATION Fieldbus

    Bluetooth® wireless technology

  • Certificates / Approvals


  • Safety approvals

    Overfill prevention WHG


  • Design approvals

    EN 10204-3.1

    NACE MR0175, MR0103

    ASME B31.3


  • Marine approval

    GL/ ABS/ LR/ BV/ DNV

  • Options


    Customized parameterization,

    Remote operation via SmartBlue App using Bluetooth®,
    Gas-tight feed through,

    Antenna Extension,

    PWIS free

  • Application limits

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

    Ammoniacal gas phase:

    FMR54 in stilling well

    Strong build- up formation:

    FMR54 with air purge

    316L or Alloy C non-resistant:

    FMR50, FMR52, FMR53

    Hygiene requirements:

    FMR52, FMR53

    Custody transfer measurement:


Download: Micropilot FMR51, FMR52 Technical Information

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