TrueDyne Sensors AG is one of the leading providers in the development of microsensor systems (MEMS systems). Their strength lies in microsensor technology and multi-parameter measurement technology.  By combining these technologies in its sensors TrueDyne creates added value for its customers. They guarantee optimal performance by using new and well-known measuring principles in their unique compact sensors.

MEMS measurement systems open up new opportunities for  customers to improve product quality, process reliability and productivity, thereby creating new sales and savings opportunities. TrueDyne sensor modules guarantee maximum performance in a compact design. Using ready-to-install, very small OEM measurement modules tailored to the customer's portfolio or installing a customer-specific solution - as an individual configuration, including connection to any operating environment, TrueDyne sensors serve a wide variety of industries: Oil & Gas, Power & Energy, Life Sciences and Food & Beverage.

Overall, every industry benefits from the application advantages of very precise density and flow measurements of the smallest volumes in the smallest of spaces. In other words: TrueDyne Sensors adds innovative microsensor technology to today's process measurement technology, creating added value through the consistent combination of the competence areas of microsensor technology and multi-parameter measurement technology.

TrueDyne Sensors

The principles of the sensors from TrueDyne Sensors AG are based on microstructures vibrating in resonance. Thus, the TrueDyne Sensors AG sensors can measure density and viscosity on the basis of vibronic MEMS sensors. Contact with the media changes the resonance frequency, the vibration properties and the vibration quality of the structures. Density and viscosity can then be determined using physical models.

Density Sensor for liquids and gases

Density Sensor for liquids and gases


The DLO-M2 density sensor enables the density of liquids and gases to be monitored during the ongoing process, which means that analysis in a laboratory is no longer necessary. With the sub-millimetre measurement channel, the quality and properties can be monitored in the smallest of spaces.


  • By combining density and volumetric flow data, one can determine the mass of a liquid. This application is possible, for example, in orifices, turbines or displacement devices.
  • The density can be used to monitor the quality of fuel mixtures (such as E10 or biodiesel).
  • Concentration monitoring of liquids: In the case of refrigerants, the concentration of liquids can be used to prevent them from freezing.
Viscosity Sensor VLO-M2

Viscosity Sensor for liquids


The viscosity sensor VLO-M2 determines the viscosity of liquids in an omega-shaped micro-channel. Viscosity data can be used to check the quality of liquids in an ongoing process. In addition to measuring viscosity, the VLO-M2 sensor records the density and temperature of the liquid.


  • The process reliability can be increased by the viscosity.
  • Viscosity plays a major role in engine oil calibration systems, for example.
  • Viscosity helps to monitor the quality of fuels and lubricants.
Density sensor for gases

Density sensor for gases


The DGF-I1 density sensor for gases not only measures the density with minimal quantities, but also determines the temperature and the pressure at the same time. This enables precise monitoring of the quality and determination of the concentration of binary gases.


  • The density can be used to monitor the ratio of gas mixtures, which always ensures the correct gas mixture
  • By monitoring the gas composition based on density during the filling of food packages, the loss of food through sampling is eliminated

  • Checking of pure gases: The contents of a gas bottle can be checked based on the density. This makes it possible to check in the process whether the correct gas is being used

Our motto is «Rethink Sensing». We create innovative miniaturized sensor solutions for our customers.

Josua Ritter, Managing Director of TrueDyne Sensors AG

Usage of TrueDyne Sensors across various industries

Clean gas monitoring
Monitoring of clean gas

Gases are often colorless and odourless, rather expensive, or damage can occur - until now, the only way to check whether the right gas was flowing out of the storage facility or into a process was with spot checks. With the TrueDyne density sensor, you can determine the density of a gas and thus the quality directly during operation. In this way you rule out mix-ups and prevent rejects.

Monitoring gas mixtures for food packages
Monitoring of gas mixtures for food packages

To enable a longer shelf life, salads, vegetables, meat, and other fresh foods are packaged in a protective atmosphere, and to prevent them from turning brown. As standard, individual food bags are pierced after filling and the gas inside them is tested. If the result is inadequate, the entire production batch must be discarded.

With the density sensor from TrueDyne, you can check the quality of the gas mixture directly during the process in real time making  spot checks obsolete.

The result is less food waste as well as time and cost saving.

Density sensor for aircraft fuelling
Density Sensor for aircraft fuelling

When kerosene is pumped from the airfield distribution system into an aeroplane by a an aircraft fuel truck, the fuel volume is recorded as standard. As the density varies according to pressure and temperature, it is not possible to make precise statements about the mass. Therefore, samples are taken from the tank farm throughout the day and handed over to the pilot for calculation of the mass.

With the DLO-M2_ex sensor from TrueDyne, the necessary density data can be evaluated  during the process and can be used to calculate the mass (V-ρ=m). Along with the volumetric measurement, the density can be used to calculate the mass of the fuel in kilograms, which is then handed over to the customer. In addition, the density provides important information about the quality of the fuel, which is another safety feature in flight operations.

Density sensor - Alcohol production in a brewery
Density sensor - Alcohol production in a brewery

Alcohol is produced by the fermentation of a sugar source with a catalyst, typically yeast or certain bacteria. During this process, the carbohydrates (sugar and starch) are converted into carbon dioxide and ethyl alcohol. This serves as the basis for all alcoholic beverages, regardless of whether they are beer or spirits such as gin and whiskey. During production, samples must be taken and analyzed in order to make a statement about the progress of the fermentation process. Classical measuring instruments and -methods, such as alcohol determination using a beer wort spindle, often have deficiencies in terms of often have deficiencies in terms of accuracy, repeatability and the required sample volume.

This is exactly where TrueDyne's density sensor DLO with integrated concentration determination comes in. By measuring dissolved solids, mineral content, sugar as well as alcohol in the starting products the final alcohol content of the beverage can be determined, while at the same time while at the same time enabling quality control throughout the entire production process.

Volume to mass
Volume (l) to mass (kg)

When fuel is pumped from a truck into a tank system, the volume of the liquid in the tank is measured as standard. Density, however, varies depending on pressure and temperature, and making precise statements on mass are not possible.

With the DLO-M1 sensor from TrueDyne, you can record the necessary density data during the process and use it to calculate the mass (V·ρ=m).

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