E+H Micropilot NMR81 Radar Level Transmitter

Micropilot NMR81 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. NMR81 is particularly suited for free space applications up to 70m. The drip-off lens antenna with 80 GHz transmitting frequency produces a sharply focused beam angle of 3° and avoids obstacles even close to tank wall.

  • Hardware and software developed according to IEC 61508 up to SIL3 (in homogeneous redundancy) for high level of safety
  • Maximum reliability through accuracy up to ±0.5mm (±0.02″)
  • Developed according to international metrology recommendations such as OIML R85 and API MPMS
  • Local and country-specific certifications like NMi or PTB for custody transfer applications
  • Simplified installation and trouble-free operations due to easy connection to major DCS systems via open protocols
  • 80GHz technology for narrow beam angle for sharper focus, without interference from tank wall and obstructions

80GHz drip-off lens antenna suited for free space applications up to 70m offers high beam focusing for applications with nozzle situated close to tank wall.

  • Process connections: Flanges
  • Temperature: -40 to +170°C (-40 to +338°F)
  • Pressure: Vacuum to +16bar (Vacuum to +232psi)
  • Maximum measuring range: 70m (230ft)
  • Accuracy: ±0.5mm (±0.02″)
  • Transmitting frequency: 80GHz
  • International explosion protection and custody transfer certificates, overfill prevention WHG, SIL
  • Measuring principle

    Level radar

  • Characteristic / Application

    Lens antenna, 80GHz: High precision measurement for for storage tanks up to 30 m (98ft)

  • Specialities

    Custody transfer level measurement

    Measurement close to tank wall

  • Supply / Communication


  • Accuracy

    up to 0.5 mm

  • Ambient temperature




    For calibration to regulatory 



  • Process temperature



  • Process pressure absolute / max. overpressure limit

    Vacuum…..16 bar abs

  • Main wetted parts

    316L, PTFE

  • Process connection



    Flange w/ Alignment tool:




    UNI-Flange w/ Alignment tool:


  • Max. measurement distance

    70 m (230 ft)

    For calibration to regulatory standards:

    30 m (98 ft)

  • Communication


    Fieldbus: Modbus RS485, V1, HART

    Analog 4-20mA output (Exi/ Exd)

    Relay output (Exd)


    Analog 4-20mA input (Exi/ Exd)

    2-, 3-, 4-wire RTD input

    Discrete input (Exd, passive/active)

  • Certificates / Approvals


  • Design approvals

    EN 10204-3.1

    NACE MR0175, MR0103


  • Metrological approvals and certificates

    OIML, NMi, PTB

  • Options

    Redundant fieldbus

    Alu-coated or 316L housing

    Weather protection cover

    Adjustable mounting seals

  • Application limits

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

    Strong condensate or build-up 

Datasheet: Micropilot NMR81 Technical Information

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