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Average temperature measurement
Prothermo NMT539

High precision average temperature measurement

  • Prothermo NMT539 ©Endress+Hauser
  • Prothermo NMT539 ©Endress+Hauser

Prothermo NMT539 is an intelligent HART signal converter, with a combined average temperature sensor and water bottom interface probe. For average temperature measurement consists of precision multispot Pt100 elements. The NMT539 is a highly capable solution for constant average temperature data and water interface data via HART communication. For custody transfer and accurate inventory measurement, it is best suited connected to Proservo NMS5 or Tank Side Monitor NRF590 with Micropilot.


  • Intrinsically safe device allowing for the safest electrical configuration possible

  • Available in four different versions based on customer requirements:
    Converter only
    Converter and temperature probe
    Converter and water bottom probe
    Converter, temperature and water bottom probe

  • Converter is compatible with various element types in third party manufacturer temperature probes

  • Compatible with Endress+Hauser's user friendly FieldCare

  • Variety of process connections and cable entries available to meet worldwide classifications

  • High reliability and easy installation

  • Maintenance free

Field of application

For precision average temperature and water bottom measurement.

  • Process connection: Flanges

  • Temperature: -40 to +100°C (-40 to +212°F)

  • Measuring distance: 40m (131.2ft)

  • Accuracy: ± 0.1°C

  • International explosion protection certificates

Features and specifications

Documents / Manuals / Software

Accessories / Spare parts

Predecessor / Successor

Predecessor: Prothermo NMT535, NMT536, NMT537, NMT538, RCV11, RCV12

Success stories


Endress+Hauser Inc.
2350 Endress Place Greenwood , IN 46143 United States
Tel.: 888-363-7377
Tel.: 888-ENDRESS
Tel.: 317-535-7138
Fax: 317-535-8498

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