How does load cell evaluation work? An analysis

Load cell evaluation is an important part of weighing technology that ensures accurate weight measurement. The evaluation is based on strain gauge technology, which is recorded by sensors and processed digitally. DEMIC's devices combine state-of-the-art hardware and software technologies and deliver high accuracy and for use in various applications. Load cells and contact sensors enable the measurement of weight in two directions and the signal is processed by the electronics.

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What are measuring amplifiers?

One of the very basic components in weighing technology in general is the load cell, which measures the weight of the object to be weighed. A measuring amplifier is used to amplify the signal from the individual load cell and provide a highly precise measurement. But what exactly are measuring amplifiers? Measuring amplifiers are electronic devices that can amplify and process the weak signal from sensors such as strain gauges.

They offer high accuracy when measuring weights in various applications and allow the signal to be forwarded to control systems or a display. The use of strain gauges as sensors has many advantages, as they react very sensitively to changes. The variety of functions of measuring amplifiers allows them to be used in a wide range of applications - whether in contact with liquid or gaseous substances or in use under extreme conditions such as high temperatures.

Successful load cell evaluation therefore depends largely on the quality of the measuring amplifier. DEMIC offers specialized strain gauge amplifiers in its systems that are configurable and can be automatically calibrated - this ensures maximum precision for every measurement. There are also digital load cells that work with a digital signal and enable even more accurate measurements. The process of load cell evaluation depends on the correct use of sensors, measuring amplifiers and software.

Main tasks of measuring amplifiers

Having already dealt with the basic functionality of measuring amplifiers, it is now time to take a look at their main tasks in connection with load cell evaluation.


As we already know, load cells are capable of precisely measuring the weight of an object and converting it into an electronic signal. However, before this signal can be displayed, it must be amplified and processed by special electronics.

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Accurate measurements

This is where the measuring amplifier becomes important: it offers the option of amplifying the signal and filtering out interference at the same time. It also allows the degree of amplification to be controlled and software to be used for even more precise measurement.

This clearly shows how important measuring amplifiers are for load cell and weighing technology - without them, accurate measurements would not be possible. In our next section, we look at strain gages as an important component of modern load cell systems and consider their advantages and diverse functions for different applications.

What are strain gauges (DMS)

Strain gauges are important sensors in weighing technology. They are attached to load cells and measure the strain that occurs when the cell is loaded. The measured values are then evaluated by the electronics and made available as a weight for the subsequent process steps. Strain gauges offer high accuracy and are therefore ideal for applications where precise measurements are required.

As they measure without contact, strain gauges are also suitable for use in environments with high temperatures or heavy wear. Overall, the use of strain gauges is an important part of load cell evaluation and offers a wide range of functions for different applications in various sectors such as industry or trade.

A wide range of functions for a variety of applications

The strain gauge measuring amplifiers from DEMIC offer a wide range of advanced functions that make them indispensable for various applications. These include special techniques for noise suppression and filtering, which significantly improve the signal-to-noise ratio. In addition, these measuring amplifiers also enable the simultaneous measurement of strain or pressure at several points thanks to their multi-channel capability.

Linearization, configurability as well as insulation and protection against overvoltage or electromagnetic interference complete the performance spectrum and make the strain gauge measuring amplifiers from DEMIC an excellent choice for demanding measuring tasks.

Digital load cells...

Digital load cells are state-of-the-art technology used in various industries to perform accurate weight measurements. They are a further development of traditional analog load cells and offer a variety of advantages. Digital load cells can also be based on the principle of strain measurement, where a stretchable sensor measures the deformation of the material when weight is applied to the cell.

These measurements are then digitally evaluated by an internal microprocessor and converted into readable data. However, digital load cells can also work using a different principle. The oscillating side, for example, is based on the principle that the frequency of an oscillating wire bridge changes when weight is applied to the load cell.

...and what they can do

This change in frequency is then recorded by a digital sensor and converted into accurate weight data. Digital load cells based on the oscillating side offer high accuracy and stability in weight measurement. They are characterized by their robustness and resistance to environmental influences such as vibrations, temperature fluctuations and humidity.

In addition, digital load cells can be integrated into existing systems and offer a variety of communication interfaces such as RS485, RS232 and Ethernet to seamlessly transfer data to other devices or systems. These features make digital load cells an extremely versatile and reliable solution for different weighing technologies and applications.

Advantages of measuring amplifiers from DEMIC

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Accurate measurements

The measuring amplifiers from DEMIC enable precise and accurate measurements. They guarantee a high resolution and can detect the smallest changes or fluctuations.

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High reliability

DEMIC's measuring amplifiers are designed for a long service life and high reliability. They are rugged and robust to withstand the demands of various industrial environments.

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High signal quality

DEMIC's measuring amplifiers improve signal quality and reduce interference and noise. This increases the accuracy of the measurement results and enables reliable data analysis.

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Simple integration

DEMIC's measuring amplifiers can be easily integrated into existing systems. They offer various interfaces and communication protocols to enable seamless integration with other devices or software solutions.

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High flexibility

The measuring amplifiers from DEMIC are versatile and support various input signals as well as a wide range of weighing signals. They can be adapted to various requirements.

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Compact and space saving

The measuring amplifiers from DEMIC are also compact and space-saving. This means they can be used in a wide variety of applications and measurement processes, even in environments with limited space.

DEMIC: We guarantee quality

The measuring amplifiers from DEMIC are therefore true all-rounders and can be used for a wide variety of projects. We also have many control systems based on them in our range so that you can make the best possible use of the measuring amplifiers.

At DEMIC, we rely on many years of experience and extensive know-how. Do you still have questions? Then please contact our experts and we will be happy to help you. We look forward to hearing from you!

FAQ: You ask, we answer

With DEMIC systems, both variants are always taken into account and can be conveniently selected via a web server.

Digital load cells offer a number of advantages. They enable precise weight measurements with high accuracy and are often robust and resistant to environmental influences. Digital load cells can also automatically compensate for temperature and other influences. They offer easy integration into existing systems and often have various communication interfaces for seamless data transfer.

Yes, there are measuring amplifiers that have several input channels and therefore enable simultaneous measurement on several strain gauges. Of course, DEMIC also offers these.

Calibration is essential for the accuracy of your planned measurements. It is therefore important that it is carried out at regular intervals and in accordance with the manufacturer's specifications.

This varies from product to product. Temperature, humidity and electromagnetic interference can affect the performance of a measuring amplifier. It is therefore important to consider the operating conditions at all times.

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Your contact

Björn Demmer

Shareholder - General manager

PHONE: +49 2247 918 90
E-MAIL: bdemmer(at)

Heinz Demmer

Shareholder - General manager

PHONE: +49 2247 918 90
E-MAIL: hdemmer(at)