Ultrasonic flow meters

Ultrasonic Flow Meters and Controllers for low-flow

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 ultrasonic working principle, using ultrasound in a very small, straight tube. A wide range of liquids can be measured independent of fluid density, temperature and viscosity.

  • Flow rates from 0,4 ml/min up to approx. 1500 ml/min, depending on e.g. the available pressure drop.


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Quick link to Low-flow Ultrasonic Flow Meter model pages

Full Scale capacities versus pressure rating

PN 10 bar PN 100 bar
  ES-112C  |  4 ... 200 ml/min
ES-103I  |  MkI:  200 ... 1500 ml/min;
                   MkII: 100 ... 1500 ml/min
ES-113I  |  MkI:  200 ... 1500 ml/min;
                   MkII: 100 ... 1500 ml/min
  ES-113C  |  100 ... 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


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

Ultrasonic Liquid Flow Meters / Controllers

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


ES-FLOW brochure Series ES-103I/113I
ES-FLOW Ultrasonic Flow Meter model key
Manual ES-FLOW
Quick Installation Guide ES-FLOW with GEMÜ valve
ES-FLOW Series DoC EC1935-2004
3-A Authorization Certificate
Ultrasonic Flow Meter for low flow rates


  • Semiconductor industry
  • Pharmaceutical industry
  • Food industry (flavors, additives)
  • Biotechnical industry
  • Analytical laboratories
  • Thermal Spray Coating
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