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Radar measurement
Micropilot NMR81

Micropilot NMR81 ©Endress+Hauser
Micropilot NMR81 ©Endress+Hauser

Drip-off lens antenna with 80 GHz transmitting frequency for custody transfer applications

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.

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  • Avantaje

    • 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...

  • Domeniu de aplicare

    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 +...

Caracteristici şi specificaţii



  • 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

Documente / Manuale / Software

Accesorii / Piese de schimb

Order code
  • 21
    • Nr 21 Order code 71312582

      O-ring, housing, 177.39x3.53, TG

      Material: FVMQ, PTFE coated. Usage: housing F35/36/37/38, NRF81, NMR81/NMR84, NMS80/NMS81/NMS83.

  • 19
    • Nr 19 Order code 71312589

      Housing filter, PTFE, NMR8x, 2 pcs.,TG

      Consists of: 1x pressure compensation plug M18, 316L. 1x filter plug metal M12, 316L. 1x pressure compensation filter. Usage: housing F36/38, NMR81/NMR84.

  • 14
    • Nr 14 Order code 71312592

      Blind plug, M20, 316L, O-ring EPDM, TG

      Consists of: blind plug, O-ring 18.0x2.0. Usage: housing F35/36/37/38, NRF81, NMR81/NMR84, NMS80/NMS81/NMS83.

  • 15
    • Nr 15 Order code 71312594

      O-ring, blind plug, M20, EPDM, 5pcs., TG

      Usage: housing F35/36/37/38, NRF81, NMR81/NMR84, NMS80/NMS81/NMS83.

  • 20
    • Nr 20 Order code 71312596

      Front cover Alu, sight glas, gasket

      Material: aluminum. Consists of: cover, O-ring FVMQ, PTFE coated. Usage: housing F35/36, NRF81, NMR81/NMR84, NMS80/NMS81/NMS83.

    • Nr 20 Order code 71312607

      Front cover 316L, sight glas, gasket

      Material: 316L. Consists of: O-ring EPDM, clotted. Usage: housing F37/38. NMR81/NMR84, NRF81, NMS81/NMS83.

  • 17
  • 37
    • Nr 37 Order code 71324756

      Terminal set, I/O module, Push-in, TG

      Consists of: complete terminal set. Usage: NRF81, NMR81/NMR84, NMS80/NMS81/NMS83.

    • Nr 37 Order code 71324757

      Terminal set, I/O module, screw type, TG

      Consists of: complete terminal set. Usage: NRF81, NMR81/NMR84, NMS80/NMS81/NMS83.

  • 40
    • Nr 40 Order code 71312638

      Display set, RS485, holder, TG

      Consists of: operation-module, A300, optical buttons, display holder, fixing ring, cover. Usage: NRF81, NMR81/NMR84, NMS80/NMS81/NMS83.

  • 41
    • Nr 41 Order code 71312640

      Display holder, fixing ring, TG

      Consists of: fixing ring, holder. Usage: NRF81, NMR81/NMR84, NMS80/NMS81/NMS83.

  • 31
  • 33
  • .
    • Nr . Order code 71067434

      Modification name plate, non Ex

      Blank. To fill in the new order code when a non Ex instrument has been modified. Usage: FMB50/FMB51/FMB52, FMR230/FMR231, FMR240/FMR244/FMR245, FMR250,FMR530/FMR532,FTL50/FTL50H/FTL51/ FTL51C/FTL51H, FTL70/FTL71, FTL80/FTL81/ FTL85, NMR81, PMC51, PMC71, PMP51/PMP55.

  • 0