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Proline Prosonic Flow 91W
Ultrasonic flowmeter

Device with automatic frequency scan for max. measuring performance and cost-effective transmitter

  • Ultrasonic flowmeter - Proline Prosonic Flow 91W ©Endress+Hauser
  • The Ultrasonic Flow Measuring Principle

The Prosonic Flow W clamp-on sensor is specially designed for water and wastewater applications. Combined with the cost-effective Prosonic Flow 91 transmitter with push buttons, Prosonic Flow 91W is ideally suited for flow monitoring in the water industry.


  • Low capital investment – cost-effectiveness increases with pipe diameter (up to DN 4000)

  • No additional leakage paths – external measurement from outside the pipe

  • Process transparency – diagnostic capability

  • Economical transmitter – designed for easy applications

  • Fast and reliable commissioning – Quick Setup menu for installation

  • Automatic recovery of data for servicing

Field of application

  • The measuring principle is independent of pressure, density, temperature, conductivity and viscosity

  • Clamp-on flow measurement of process water, saltwater, demineralized water, drinking water and wastewater.

Device properties:

  • Medium temperature: –20 to +80 °C (-4 to +176 °F)

  • Degree of protection IP68 (Type 6P enclosure) for pipes under water

  • Shock and vibration resistance according to IEC 68-2-6

  • Aluminium field transmitter housing

  • 2-line display with push buttons

  • HART

Features and specifications

Documents / Manuals / Software

Accessories / Spare parts

Predecessor / Successor

Predecessor: Prosonic Flow Clamp On 90W, 90WA, 90WB, DDU18

Success stories


Endress+Hauser AG
Kägenstrasse 2 4153 Reinach BL Switzerland
Tel.: +41 61 715 7700
Fax: +41 61 715 2888
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