ES-FLOW® Low-Flow Ultrasonic Flow Meters / Controllers

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.

  • 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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E-book: How to handle low liquid flows

Focusing on low liquid flows < 100 g/h

Download the e-book 'How to handle low liquid flows' to find out more about 'low flows'. Including in-depth information, technical advice and insider tips from our experts.

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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

Video ES-FLOW Ultrasonic Flow Meter

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 Flow Meters & Controllers

Ultrasonic Flow Meter for liquids

Due to the combination of a straight sensor tube with zero dead volume, self-drainability, orbital TIG-welding and hygienic connections, this ultrasonic 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 ultrasonic 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.

Ultrasonic working principle


ES-FLOW brochure Series ES-103I/113I
ES-FLOW datasheet Series ES-1xxC
ES-FLOW Ultrasonic Flow Meter model key

Manual ES-FLOW
Quick Start Guide ES-FLOW with GEMÜ valve
Quick Start Guide ES-FLOW C-type

ES-FLOW Series DoC EC1935-2004
3-A Authorization Certificate
Ultrasonic Flow Meter for low flow rates

Applications using Ultrasonic Flow Meters

  • 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