MAGIN-Ex® Volume Flow Measuring

The MAGIN-Ex® series is designed for volume flow measurement, which can be integrated with further measurements such as pressure and/or temperature. To increase the fail-safety, safety-relevant circuits are redundantly designed.

The development was based on state-of-the-art technologies, both in the field of electronics and mechanical design, with the aim of offering a modern and highly technical measuring instrument for underground mining applications. Due to the used processor electronics, high measuring accuracies and fast reaction times, as well as with the mechanical design, a great variety of configurations can be realized. This allows you to assemble your individual measuring device for your application. With the magnetic-inductive measuring method, no mechanical components are used for the measurement recording, so that a high failure safety against, e.g. pollution in the liquid is reached.  According to Faraday’s law of induction, a voltage is induced into the medium to be measured, which moves in a magnetic field, utilizing two coils.This induced voltage behaves logarithmic to the flow rate and is fed to the electronics via two laterally arranged measuring electrodes. The flow volume is then calculated over the nominal width. The direction of flow is not relevant for these volume flow meters.
Prerequisite for this measuring principle is the use of conductive media, such for example water or liquids with water. Oil cannot be measured with the MAGIN-Ex®. There is the SMALL-Ex® ViscoFlow for use in pure oil by use of gearwheels inside.The measuring instruments are designed for use under very rough and difficult ambient conditions and withstand very high mechanical loads due to their extremely solid construction and the stainless-steel housing. They are designed for use in filled systems with liquid media.


I M1 Ex ia I Ma
Ex ia I Ma


BVS 06 ATEX E 061
IECEx BVS 13.0072

Env. Tempemperature

-50 to +80 °C

Housing material

Stainless steel, steel

Gauge accuracy

+/- 0,5% from end value (higher accuracy on request)


filtered water

Illuminated Display



l/min; m³/h; gpm (other units on demand)

Output signal

5 – 15Hz
0/4 – 20mA
* – **V (max. 10 V DC, at min. 7,5V power supply)

Nominal voltage

12V DC (+10% / -20%) 3-wiring technology


Discover more about Grünewald

We are teamplayers

Discover more about our team and their expertise in measurement technology

Our downloads

Look for operation manuals, certifications, or our catalog as downloads.

Did you know?

This is what one of our displays for our MAGIN-EX® measurement device series looks like.

We also offer control displays for all our other measurement devices and series.