Tension Sensor FSL

5 Tension ranges available
from 0 - 50 cN up to 0 - 1000 cN

Stationary electronic tension sensors for measuring sensitive materials as optical fibres, carbon fibres, technical fibres etc.

Large, smooth running guide rollers for minimized material deflection with 32 mm groove Ø

Low cost tension sensor for quick and easy mounting

Special Features

Tension sensor FSL with integrated measuring amplifier and high accuracy of 1.5 % FS

Large bending radius for gentle handling of sensitive material by using smooth running, V-grooved guide rollers with Ø 32 mm, ball-bearing mounted

Various output signals are available:
– analog: 0 – 1 V DC (standard), 0 – 10 V DC (optional)
– digital (optional): USB, RS-232, Wi-Fi, RS-422 – see model FSL-422
– current: 4 – 20 mA (optional)

Easy installation, even afterwards, on existing machines

2 Mounting possibilities: housing mounting or cylindrical hole mounting (mounting cut out 38.5 – 40 mm Ø) – see picture above.
The housing of sensors with digital output are larger and need as mounting cut a longhole R 19 with a length of 54 mm

Easy calibration to customized material by operator – zero and gain calibration is required

With high quality strain gauge bridge

Tension sensor with mechanical overload protection

Standard Features

Tension sensor FSL with aluminium housing

Required power supply +15…24 V DC (regulated)

Certificate of Compliance with the order 2.1 according EN 10204 is included

Optionally available: Inspection Certificate 3.1 according EN 10204 with calibration report

Lern more about the different tension measuring systems

You are not sure, which system is right for, or where the differences are? Here we explain it for you.

Available Models

ModelTension Range
Measuring Head Width*
SCHMIDT Calibration Material**
FSL-500 – 50 cN150 mmPA: 0.12 mm Ø
FSL-1000 – 100 cN150 mmPA: 0.12 mm Ø
FSL-2000 – 200 cN150 mmPA: 0.12 mm Ø
FSL-5000 – 500 cN150 mmPA: 0.20 mm Ø
FSL-10000 – 1000 cN150 mmPA: 0.30 mm Ø
Other tension ranges and measuring head widths available on request.
Other measuring units available, such as g.
* Outside dimensions of front plate
** Suitable for 95 % of applications PA = Polyamide Monofilament


Calibration to customized material:
If process material differs significantly from the SCHMIDT calibration material in diameter, rigidity or shape, special calibration using customer supplied samples is recommended. For this purpose a material sample of about 5 m should be supplied.

Anzeige SC-PM und Vorverstärker SCV-1For the tension sensor FSL we offer different display units for one or more sensors, as well as strain gauge amplifier.

Find further information at display units and amplifier

tension sensor FS1Tension Sensor FSL can be reconverted for special applications.

Find further information at special design


Calibration:According to SCHMIDT factory procedure
Accuracy:±1.5 % full scale and ±1 digit % full scale or better
other calibration material ±3 % full scale or better
Overload protection:100 % of tension range
Measuring principle:Strain gauge bridge
Measuring roller deflection:Max. 0.5 mm
Natural frequency:Approx. 500 Hz, depending on tension range
Signal processing:Analog
Temperature drift:up to FSL-200 less than ±0.2 % full scale/ºC
from FSL-500 less than ±0.05 % full scale/ºC
Output signal:Standard: 0 – 1 V DC (analog) impedance: ≥ 5 kΩ
Option: 0 – 10 V DC (analog), 4 – 20 mA DC (current)
Option digital: USB (500 Hz), RS-232 (200 Hz), RS-422 (200 Hz) or Wi-Fi
Damping (fg):Standard: 30 Hz (other values on request)
Temperature range:10 – 45 ºC
Air humidity:85 % RH, max.
Power supply:+15…24 V DC, max. 21 mA (standard outout), other max. 50 mA regulated
Housing material:Aluminium
Dimensions:See dimensions
Weight, net (gross):Approx. 340 g (approx. 440 g)

Specifications subject to change without notice!

Guide Rollers

Order-CodeLine Speed vmax. … m/minRoller Material
Standard4000Hard-cotaed aluminium
Code T
4000Plastic red (PVC)

Standard Accessories

  1. USB Connecting Cable

    USB Kabel zum Verbinden des Sensors Code USB mit einem PC

    Cable for USB output to connect the tension meter to a PC.
    Cable length 3 m
    Order number: EK0805

    Only standard accessory for sensors with code USB!

Accessories (optional)

  1. Software Tension Inspect 3


    For displaying and saving readings on a PC (Win XP and higher; 32 bit and 64 bit).
    Only for sensors with digital output signal.
    – Real-time reading
    – The readings are also shown in a X-Y- diagram (time/date-tension)
    – For data analysing the buffered diagram can be zoomed and scaled
    – Recording of the buffered readings as CSV-file (on user request)
    – Download of values to Excel

    Order number: SW-TI3

  2. M9 Sub-Miniatur Connector

    Plug suitable for sensors of FS series,
    cable outlet 3.5 – 5 mm
    Ordering Example: E10071

  3. M9 Sub-Miniatur Right Angle Plug

    Plug suitable for sensors of FS series,
    cable outlet 3.5 – 5 mm
    Ordering Example: E10070

  4. Connecting Cable with M9 Sub-Miniatur Connector and Open Ends

    Connecting cable for an analog output.
    For connecting sensors of FS series to the display unit SC-PM.
    Order number: EK0620, Length 2 m
    Order number: EK0621, Length 5 m
    Order number: EK0627, Length 10 m

    Other cable length available on request!


  5. Connecting Cable with M9 Sub-Miniatur Right Angle Plug and Open Ends

    Connecting cable for an analog output.
    For connecting sensors of FS series to the display unit SC-PM.
    Order number: EK0622, Length 2 m
    Order number: EK0623, Length 5 m

  6. Connecting Cable with M9 Sub-Miniatur Connector and Diode Plug

    Connecting cable for analog output.
    For connecting sensors of FS series to the display unit SCD-1.
    Order number: EK0624, Length 2 m

  7. RS-232 Connecting Cable

    Connecting cable for tension sensor FSL with RS-232 interface – Code RS 232:
    This cable is needed to connect the sensor to a PC or an analog signal processing unit; AC adapter for 100 – 240 V power supply is included, 3 m long
    Order number: EK0640

  8. RS-232 Extension Cable


    Extension cable for RS-232 connecting cable EK0640, length 2 m
    Order number: EK0643

  9. USB Adapter

    USB-RS-232 Adapter

    Adapter from RS-232 to USB.
    Order number: EBG510

Output Signal

Calibration Report

title page calibration certificate 3.1Inspection Certificate 3.1 according DIN EN 10204
including a calibration report is optional available.


Spare Rollers

Title guide roller catalogueDownload an overview for the guide rollers.



Here you can find the dimensions of tension sensor FSL for download.
Delivery Includes

Tension sensor FSL with transport packaging, operating instruction in German or English (as requested), Certificate of Compliance with the order 2.1 according EN 10204 free of charge

How To Order

To order tension sensor FSL:

Please indicate the complete order number e. g.:

Model with tension rangeCode guide rollers(if not standard)Code ouput signal (if not standard)Complete Order No.

Instruction Manual

Download the instruction manual of tension sensor FSL and FSL with RS-232 or USB output:

If you want to get a quote or want to place an order please contact us.

+49 (0)8638 9410-0

+49 (0)8638 4825