Last Updates: 16/08/2020

E&H Micropilot NMR81 Radar measurement

Part Number: NMR81 Categories: ,
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  • 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

      ATEX, FM, IEC Ex, EAC

    • 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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