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Measuring Amplifiers for Tension Monitoring

Are you looking for a measuring amplifier that allows easy operation and setup? Does it need to offer you versatile mounting options? And be compatible with all FMS force sensors? Then the FMS measuring amplifiers with their wide product range are exactly the right product for you.

To the FMS measuring amplifier range.

Your advantages

  • Ease of use and setup
  • Versatile mounting options
  • Compatible with all FMS force sensors
  • Wide range of technologies


  • Configuration directly on the device, via a web browser, a network protocol or a mobile device 
  • DIN rail mounting, panel mounting, field mounting with increased IP protection rating
  • All force sensors with an input resistance of 350 Ω can be used
  • Analog, digital, for fieldbus and Ethernet networks

Our promise

  1. Easy installation
  2. Reliability and long service life
  3. Maintenance-free operation
  4. 100% compatible
  5. Solutions for all common PLC interfaces

The FMS measuring amplifier. Experience makes the difference.

From the first analog measuring amplifier EMGZ 306 (which is still produced today with a few revisions along the way) to the latest generation of devices with connection to fieldbus and Ethernet networks, FMS has delivered countless numbers of measuring amplifiers all over the world. 

Solutions of all kinds

Each project has its own special challenges. However, with its wide product range, FMS is always able to find a suitable solution for even the most demanding applications. Our close collaboration with our customers contribute to the development of our digital amplifiers and also allowed FMS to develop a wide range of network-enabled devices. 

It is all in the mix

With the right combination of performance, economy and ease of use, FMS offers you its measuring amplifiers and optimal signal processing for web tension control.

Schematische Darstellung von Messverstärkern zur Regelung des Bahnzugs.

Function description

All FMS measuring amplifiers are enabled to accept a 24 VDC supply. The amplifier feeds the force sensors with a highly stable excitation voltage of 5 VDC. The output mV signal of the force sensor is amplified and processed within the amplifier. The roller weight is compensated using the Offset (>0<) function. During calibration (CAL), the gain is defined, which then determines the correct conversion to the desired force value. The output signal of the amplifier is the output ready for use in your PLC or another high-level controller. The FMS product range consists of numerous measuring amplifiers with a wide variety of basic properties. In addition, FMS offers additional options to meet all your specific needs. These include different types of operating and configuration options, versatile mounting methods, and a large selection of Ethernet protocols, as well as additional inputs and outputs. Measuring amplifiers from FMS can be found in applications in the converting, paper, metal and textile industries as well as in the manufacture of wires and cables.

Questions and answers

What are the advantages of ethernet communication over power outputs on a measuring amplifier?
The resolution of sensitive force sensors and amplifiers can be used much better using a 16 bit word instead an analogue signal (with a measuring range of 1:50 the signal is as small as 20 mV at lowest measurable point). Wiring of machines can be reduced a lot, and especially modular machines are much easier to connect from module to module.

What’s the difference between analogue and digital measuring amplifiers?
Analogue amplifiers use many more components that are temperature dependent, the worst being the potentiometers to adjust offset and gain. Signal filtering depends on capacitors that will lose their capacity over time. In digital amplifiers all parameters are stored reproducibly in a memory facilitating a replacement without recalibration.

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