Liquid Independent Measurement of Low Volume Flow Rates

ES-FLOW™ are Volumetric Liquid Flow Meters for very low flow ranges. The instruments operate on a innovative measuring principle, using ultrasound in a very small, straight tube. A wide range of liquids can be measured independent of fluid density, temperature and viscosity.

  • Lowest range 4 ... 200 ml/min
  • Highest flow approx. 1500 ml/min, depending on e.g. the available pressure drop.


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Liquid Flow Meters

Due to the combination of a straight sensor tube with zero dead volume, self-drainability, orbital TIG-welding and hygienic connections, this flow meter can be used for hygienic applications. Wetted parts are made of stainless steel, except for the rubber gaskets at the Triclamp or flange connections. The exterior design is according to IP66 as well as IP67. For non-hygienic applications, the instruments can also be equipped with compression type fittings.
The user interface is a capacitive touchscreen with a TFT display to operate and readout the instrument.

Liquid flow control

The liquid flow meter can be connected to a dosing pump or a control valve to form a closed control loop. The electronic control function forms part of the normal circuitry in the meter.

Read more about ultrasonic liquid flow measurement

Quick link to Low-flow Ultrasonic Flow Meter model pages
Full Scale capacities versus pressure rating

PN 10 bar PN 100 bar
ES-103I  |  200 ... 1500 ml/min ES-113I  |  200 ... 1500 ml/min


  • Innovative sensor with fast response time and high accuracy
  • Low pressure loss due to the straight stainless steel tube
  • Dosing with integrated PID controller
  • Compact control solutions using a valve or a pump ( see picture >> )
  • Direct volume flow measurement, independent of fluid properties 
  • Hygienic design with capacitive touchscreen
  • IP66 and IP67 rating and CIP cleanable

Ultrasonic Flow Meter with Pump

Ultrasonic Flow Meter for low flow rates


  • Semiconductor industry
  • Pharmaceutical industry
  • Food industry (flavors, additives)
  • Biotechnical industry
  • Analytical laboratories
  • HPLC-applications
and many other markets which require precision fluid handling e.g. fuel consumption measurement and dosing of colorants or lubricants in many industries.

Application story


ES-FLOW brochure
ES-FLOW model key

ES-FLOW (Principle of operation)

In this video clip, we proudly present the principle of operation of our new ultrasonic flow meters and controllers from the ES-FLOW series.

Bronkhorst High-Tech B.V.

Nijverheidsstraat 1A
NL-7261 AK Ruurlo (NL)
Tel. +31 573 45 88 00
[email protected]

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