Rotary Transmitters

Rotary Transmitters

Product Description

Magtrol Rotary Transmitters are used for signal transmission of transducers on a rotating part (e.g. engine shaft) to a stationary system (measuring instrument or PC). They are exceptionally well-suited for the transmission of low level electrical signals, such as those from thermocouples, extensometer gauges and strain gauges, as well as transducers to measure oscillation and acceleration. RS Transmitters can also provide the power supply signal to each transducer.

Magtrol’s RS Series Rotary Transmitters do not use slip rings and are therefore arc-free, making them superior to all other rotary transmitters that use rings, brushes, wire loops and similar devices. Easy to use, installing RS Transmitters is as simple as connecting a cable. They require no power supply, batteries, software or parameter setup in order to operate. Standard models have a speed range of 0 to 20,000 rpm and a high-speed version (up to 40,000 rpm) is available.


  • 1, 4, 8 or 12 channels
  • Speed: up to 40,000 rpm
  • Resistance: < 0.2 mOhms
  • Noise: 25 µV
  • Signal: up to 0.3 A per cell
  • 6 0 V AC/DC
  • Very low inertia
  • No slip rings (non-contact)
  • Insensive to electromagnetic disturbance
  • Long lifetime


  Cell RS 204 RS 208 RS 212
Number of Channels 1 4 8 12
Speed Ranges standard version : 0 to 20,000 rpm
high-speed version : 0 to 40,000 rpm
Total Noise Typically 25 µV (max. 50 µV) with two cells in series at speeds from 0 to 20,000 rpm
Contact Resistance of Cell Max. 0.2 milliOhms for 2 cells in series with an instantaneous variation
from 0 to 5000 rpm
Insulation Resistance More than 10 GigaOhms for two adjacent cells
Load Current Max. 0,3 A per cell
Load Voltage 60 V AC or DC between two cells or between cell and transmitter housing
Temperature Range -25 °C to +60 °C
Thermal EMF Typically 2 µV with two cells connected in series and at speeds from 0 to 20,000 rpm;
corresponding to a possible error of 0.05% for a constantan-chromium nickel thermocouple, at a temperature difference of 600 °C
Connections (In/Out) Soldering contact Cables (400 mm input and 400 mm output cables included)


Signal Transmission Applications Rotating Parts Industries

  • Pressure
  • Acceleration
  • Oscillation
  • Vibration
  • Shock

  • Force
  • Torque
  • Temperature
  • Displacement

  • Turbines
  • Jet engines
  • Turbocompressors
  • Propellers
  • Molding machine screws
  • Spindles

  • Motors
  • Machine tools
  • Roll bearings
  • Tilting pads
  • Other machinery
  • Tests on road & rail vehicles

  • Aerospace
  • Machinery
  • Paper
  • Automobile
  • Transportation

Thermal Measurement on Multi-layered Shafts

Thermal measurement of inner spindle under rotation at 12,000 rpm

Injection Molding Machine

Surface Temperature Test on Tilting Pad Journal Bearing

Temperature measurement at 8000 rpm