Tension Sensor SFZ

8 Tension ranges available
from 0 - 10 N up to 0 - 2000 N

For measuring the tension of running wires, fibre optics, cables, ropes, slim tapes and foils

Single roller tension sensor for installation at an existing deflection pulley

Special Features

Tension Sensor SFZ without amplifier, output signal mV/V

Sensor for installation at an existing deflection pulley; though the in- and outcoming angle has to be constant

Existing rollers with 20 – 180 degree wrap angles can be used as measurement points for the sensor

Directly, axial force application

The progressively adjustable axial mounting depth using a drill hole (Ø 50 mm), enables accurate positioning of the roller depending on the material path

High overload protection (max. 10 times of nominal force, However 3200 N max. )

Easy mounting of rollers provided by the customer or from SCHMIDT. Send us your request !

IP 67 (dust tight and ingress of water) protected, optional IP 54

Different clamping devices are optional available

Standard Features

Required power supply 10 V DC regulated

Rugged, stainless steel housing

Sensor with highly mechanical rigidity

Supplied with a 5 m shielded cable with open ends (Optional length are available)

Optionally available: Inspection Certificate 3.1 according EN 10204 with calibration report (only available in combination with a display)

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

ModelNominal Load in N
SFZ-1010 N
SFZ-2020 N
SFZ-5050 N
SFZ-100100 N
SFZ-200200 N
SFZ-500500 N
SFZ-10001000 N
SFZ-20002000 N

Anzeige SC-PM und Vorverstärker SCV-1For the tension sensor SFZ 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 Range:10 up to 2000 N – nominal load
Accuracy:0.5 % nominal load
Max. applied force:160 % of nominal load, overload protection afterwards
Overload:10 times of nominal load, max. 3200 N (depending on measuring range)
Transverse force at the axle:Max. 100 % nominal load
Axle deflection:Approx. 0.5 mm
Measuring principle:Strain gauge bridge
Output signal:5 – 20 N: 1 mV/V
from 50 N: 1.5 mV/V
Max. power supply:10 V DC
Connecting cable:5 m
Bridge resistor:700 Ω
IP code:IP67 (IP 54 optional)
Temperature range:10…70° C
Weight, net (gross):Approx. 1100 g (Approx. 1600 g) inclusive 5 m cable

Specifications subject to change without notice!


Einbebauter Zugspannungssensor Modellreihe SF

Tension sensor SFZ can be easily mounted everywhere a deviating point respectively a guide roller is built in at the machine. These places can be use as measuring point, assumed the in and outgoing angle is constant.

For mounting, the sensor can be clamped on each position of the cylinder. Alternative a mounting flange or a clamping block is available (see additional Options).

Calculating the Tension Range

Determining the tension range of 1-roller tension sensors

The tension range can be calculated for every wrapping angle with this formula:

Formular to determine the force of single roller tension senorsWhen selecting the nominal measurement force it is necessary to take into account the weight of the guide roll and raise the nominal load respectively, particularly when working with small nominal forces.

Axle Journal

DesignAxle Diameter in mmSuitable Bearing
A (Standard)10 f76000/6300
B15 f76002/6302
C17 f76003/6303

According to the application different bearing journals are available (standard: code A = 10 mm)

More information to the design see dimensions

Guide Rollers
Tension sensor SFK with rollerYou can mount your own guide rollers or Schmidt rollers. A big number of rollers with different geometry and different materials are available on request – send us your demand !
Cable Connection

  1. Axial output Code T (Standard)

    cable connection Code T (standard)Axial output with screwed cable gland, cable length 5 m (longer cables available on request)

  2. Straight plug Code N2


    straight cable connection Code N2Axial output with straight plug connection M12, cable length 5 m (longer cables available on request)

  3. Right-angled plug Code S2

    gewinkelte Steckverbindung Code S2

    Axial output with right-angled plug connection M12, cable length 5 m (longer cables available on request)

Other Options

  1. Radial output Code R

    radialer Kabelausgang für Zugspannungssensor SFZPlug and cable gland code T, N2 and S2 are available with radial cable output.

  2. IP 54 Code P

    Low-cost model of the sensor according to IP code 54, protected against dust in sufficient quantity and splash water.

  3. Mounting Flange

    Anbauflansch zum Befestigen des Zugspannungssensorsfor mounting the sensor . The flange (stainless steel) can be positioned and clamped at any place of the sensor.
    Order number: SFZ-AN

  4. Clamping Block

    Klemmbock zum Befestigen des Zugspannungssensorsmade of aluminium alloy for mounting the sensor. The flange can be positioned and clamped at any place of the sensor.
    Order number: SFZ-KB


Dimensions of tension sensor SFZ to download.
Delivery Includes

Tension sensor SFZ with cable and transport packaging, operating instruction in German or English (as requested)

How To Order

To order tension sensor SFZ:

Please indicate the complete order number, e. g.:

Model with tension rangeDesignOptionComplete Order No.

Instruction Manual

Download the instruction manual of tension sensor SFZ:

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