Tension Sensor

Yarn Tension Sensor

Fil Control is a technological leader based in France and a major player in the thread textile industry. Fil Control is manufacturer of equipment including design, development and industrialization and offers its customers and partners solutions to control the thread. Our customers are major machine builder groups all over the world and yarn processors interested in machine conversion. The company achieves 80% turn over as export sales and is present in many countries thanks to its technological expertise.

We are specialized in 3 major fields: yarn cutters, yarn break sensors, and quality control devices. These main product families insure a reliable manufacturing process and a protection of the textile machine.

Quality Control Devices are one of the 3 major fields. They are used on spinning machines and allow to check on-line different process parameters of a textile thread, especially the linear and tension speed. Thus, the quality and the characteristics repeatability of spools of thread are ensured by the information provided by quality control devices.

Fil control offers 3 types of quality control devices:

  • Yarn tension measurement, for automatic winding machine;
  • Non-contact thread length measurement with the MDL-B, used to regulate the speed of the thread on the machine;
  • Continuous tension measurement used for technical thread.

Tension sensor is the product offered by Fil Control in terms of yarn tension measurement.


The characteristics of Fil Control’s tension sensors are as follows:

Application: The yarn is expected to run in a backward and forward motion. Tension sensors are used to measure the dynamical tension in a moving yarn and regulate the tension of the yarn on a winding machine.
Principle: Tension sensors are dynamical tension devices. The piezoelectric element mounted on a flexible beam is the most important part of tension sensors. The force on the ceramic is linked to the output voltage of the tension sensor. The frequency of this voltage is the result of the frequency of the backward and forward motion of the yarn. There are filters to cut-off the unused frequencies.
Calibration: Tension sensors are calibrated to supply all sensors in a range of 16% of dispersion.


product tension sensor for yarn manufacturing, leader in tension sensors in the world fil control design and manufacture

Fil control tension sensor an Adaptable solution


Fil control tension sensor adapted for use with a textile yarn process. An elongate spring arm having one end adapted to be fixedly mounted to a textile yarn processing machine and an opposite free end deflectable direction with respect machinery.

It will guide surface to the free end of said arm for engaging a running yarn.

The tension sensor in the running yarn will deflect the free end in order to deflecting direction, and means for damping the deflecting movement of said free end of said spring arm, with receptacle supporting a magnetic fluid. more information here



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Brochure Tension Sensor


Tension sensor Electrical characteristics

  • Parameters Conditions Min Typ Max
  • Power supply (V) 4.5 5 5.5
  • Temperature (°C)
  • Storage
  • Operating
  1. Humidity relative (%) 80%
  2. Dynamical tension on the ceramic (en g) 1 20
  3. Static force(g) 100
  4. Calibration voltage mV (CAG1=0 and CAG2=0) for 10g on the ceramic at 18 Hz. 327 355 385
  5. Frequency (Hz) Ripple lower than 1dB in bandpass 3 45
  6. Calibration (%) -8 0 +8
  7. RMS voltage (V) 0 1.4


Sensor’s pin number Function
1 Shielding
3 Vout
4 For factory calibration – Do not use (CS)
5 D or CAG2

7 +5V

Mechanical tension range.


  • CAG1 CAG2 Mechanical force on the ceramic (F)
  • Ground Ground 0 à 20 g
  • +5V Ground 0 à 10 g
  • Ground +5V 0 à 5 g
  • +5V +5V 0 à 2.5


tension sensor yarn

Tension sensor fil control, the best tension sensor on the market

tension sensor

the best tension sensor in the market, product made in France


The function of tension sensor

In the manufacture and processing of multi-filament yarns, such as the false twist texturing operation, the tension sensor is the key process parameter to optimise your production.

With the temporary fluctuations of the yarn tension variation , the sensor will influence significantly the quality of the yarn,

The satisfactory yarn tension sensor must have an adequately high natural frequency so as to be adapted to follow the frequency of the fluctuations of the tension.

This requirement presents technical problems, because you have to know that the vibrations of the machine itself may lead to oscillations of all tension sensors.

Fil control has developped a solution to provide a yarn tension sensor which is able to follow the fluctuations of the yarn tension, and which is relatively insensitive to machine vibrations and other external disturbances.



Fil Control offers 4 types of sensors:

Capacitive sensors

Monitor the tension variations produced by the electrical charges into the yarn in linear motion.

(PA, PE, PES, PP, Spandex …)

Optical sensors

Thanks to infrared beam, optical sensors control the presence of the yarn during linear, to-and-fro or ballooning motion.

Piezo-electric sensors


Monitor a very slow motion or record yarn vibrations of the yarn sliding on ceramic.

Electromechanical sensors

Are used when the presence or absence of the yarn must be controlled at a lower cost.


More information about yarn tension sensor click here

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