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TelMAX - the easy-to-install torque measurement without soldering and gluing

TelMAX - the easy-to-install torque measurement without soldering and gluing

28 January 2022

MANNER Sensortelemetrie: TelMAX Torque – the elegant method of torque detection/monitoring on drive trains in the field and on machines (gearboxes, pumps, motors, marine drives, cardan shafts). It is particularly suitable as a retro-fit due to the short installation time in existing systems. In contrast to classic strain gauge bonding technology with quasi clean room conditions. TelMAX Torque can be mounted in the shortest possible time even under the harshest environmental conditions.

Often the time factor for installation plays a decisive role. Bonding and adhesive curing times for strain gauges lead to long downtimes, which are to be avoided. Long downtimes are undesirable. Another challenge in the field of measurement technology for larger machines is the transport of the shaft parts or the ability to apply them on site without large-scale transports.

Especially in the field of large machinery, agriculture and cardan shafts for trucks and construction machinery, TelMAX Torque is intended to provide an alternative solution to conventional sensor and telemetry application.

The system:

TelMAX is a patented plug and play system - TelMAX Torque.

TelMA Torsion sensor:

The application of the miniaturised telemetric sensor TelMA Torque with integrated temperature detection can be realised within 3 minutes. Using micro-welding technology, the finished telemetric torsion sensor is applied without wiring or gluing. The system works with one as well as with two sensor elements. By using two sensor elements, an automatic bending moment compensation is activated.

The integrated torque measuring cells (torsion sensor) with contactless signal transmission are simply welded onto the shaft body.

The torsion sensor technology used in the rotors is based on strain gauge technology, is correspondingly reliable and has been successful in the field for more than 90 years.

The telemetry interface with antenna is integrated in the torsion sensor element. Thus, the element is completely battery-free and maintenance-free after welding.

The high signal sampling rate of 2000 samples/second guarantees a high signal resolution kHz. This means that dynamic torque signals can also be recorded without any problems.

Antenna system:

For tapping the telemetry data with a distance of up to 30mm, an antenna carrier with integrated copper wire and intelligent adjustment module is clamped onto the shaft. This antenna carrier made of plastic or 3D print can have any diameter from 30 mm...1000 mm. After inserting the copper track, the wire can simply be screwed in place.

The complete application of the rotor is ready.

Stator evaluation unit:

The final component of the system is the robust IP67 evaluation unit with integrated stator antenna. The evaluation unit inductively transmits energy and data via an air gap of up to 30 mm between the rotating shaft and the supply unit.

The system's supply voltage of 9-30 V also offers enormous flexibility in use, e.g. in vehicle operation. In addition to the usual 0-5 V voltage output, a current output (4...20 mA) is also available. The additional CAN interface also allows direct signal transmission. The system can be used directly and, if necessary, can still be configured accordingly (sensor name, sample rate, information deposit etc.) and calibrated (zero point and gain settings) by the MANNER software "Telemetry Interface".

The system is particularly easy to use and requires no prior knowledge of electronics.

Your advantages at one glance:

  • large transmission distance (shaft - stator unit) 
  • insensitive to magnetic fields 
  • no problem with shaft currents in hybrid or electric drives 
  • free choice of material (no need for ferromagnetic materials)
  • no influence of shaft displacements/radial oscillations on the measuring signal
  • good measuring signal quality even with low torsional stresses
  • Higher accuracy by a factor of ten than with magnetic methods

If you have any questions or enquiries, please do not hesitate to contact us at or phone +49 7424 93 29 - 0.

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