Power measurement

Wireless mechanical power measurements on shafts

messtec + sensor masters award

At the messtec + sensor masters 2018 trade show, the Dx-Power system took first place in the sensor category and won the coveted messtec + sensor masters award. It was recognized as an innovative system for non-contact power measurements on vehicles that does not require any additional mechanical connection for rotation angle detection.

Overview Dx-Power Advantages

Mechanical power measurements made easy

The Dx-Power system allows making mechanical power measurements as easy as child’s play. The transmitter unit (Dx-SCT) is mounted directly on the vehicle axle by means of a half-shell housing. There it acquires the torque (via strain gauges) as well as the speed via an integrated rpm sensor. The measured data is transmitted telemetrically to the Dx-receiver unit (RCI) inside the vehicle. This receiver unit calculates the synchronous values of the two signals in real time according to the formula, power = torque x rpm, and displays all values as physical variables.

Mechanische Leistungsmessung mit der Dx Empfangseinheit (RCI)
Dx-Receiver Unit (RCI)

Synchronous measurement of four axles

With four Dx-Power transmitters, the Dx-telemetry system synchronously captures the measured values from all four drive wheels or cardan shafts! The data appear in real time and can be collected and processed via CAN, Ethernet or analog.

Original shaft is retained

CAEMAX equips the system with half-shell housings which are individually attached to the shafts. The housings are also available in a waterproof version and contain all the necessary elements: sensors, the Dx-transmitter unit and a secondary winding for the inductive power supply. The design preserves the original shaft and does not require shortening, adjustment or replacement. This results in more reliable results.

Dx im Einsatz mit Ringstator
Dx in operation with ring stator for inductive supply

Easy to integrate

Due to the modular design of the CAEMAX products, the Dx-Power sensor can be easily integrated into an existing Dx-System. If, for example, a torque measurement system with protective housing, inductive power supply and Dx-telemetry receiver unit is already available, CAEMAX can easily add the “rpm” speed module. Its data are then transmitted synchronously to the torque sensor via the existing system and displayed in real time.

Interaction with other sensors

The Dx-Power system can be supplemented with additional sensors as required. The underlying Dx-telemetry system is specially designed to synchronously acquire values from different sensors. Thus, new systems can always be cascaded in, just as required.

Short set-up times

CAEMAX offers different housings for the sensors: Half-shell housings or, if required, completely individual solutions. Due to the technology used, set-up times are very short.


Maximum RPM
±7200 1/min
< 0,5 % at 0 °C to 50 °C
Signal frequency
16 Hz (others on request)
Temperature range
-20 °C to +65 °C
Torque measurement
Strain gauge
Dx-Telemetry Transmitter Unit (SCT)
Transmission frequency
Dx: 13 frequencies in the 868-MHz-Band

Dx-HT: 17 frequencies in the 2.4-GHz-Band
Sampling rate
Max. 4.6/5.0 kHz per channel (868-MHz-/2.4-GHz-Band)
16 bit
Synchronized measurements
Up to 4 Dx-Power transmitters (4 shafts)
Ingress protection rating
IP 68
Power voltage
Transmission power
Max. 10 dBm
Dx-Telemetry Receiver Unit (RCI)
Antenna inputs
2 independent receivers in diversity mode
2.83 inch color display, 320 x 240 px
Remote controllable
CAN interface
CAN 2.0b acc. to ISO 11898, max. 1 MBaud
Analog output
6 BNC sockets
Up to 4 Dx-Power
Power voltage
9–36 Volt DC
Temperature range
-20 °C to +65 °C
Approx. 170 x 130 x 53 mm (without antenna)
Approx. 0.8 kg


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