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Overview

Passive VRS (Variable Reluctance Speed) Magnetic Speed sensors are simple, rugged devices that do not require an external voltage source for operation.

A permanent magnet in the sensor establishes a fixed magnetic field. The approach and passing of a ferrous metal target near the sensor’s pole piece (sensing area) changes the flux of the magnetic field, dynamically changing its strength. This change in magnetic field strength induces a current into a coil winding which is attached to the output terminals. The output signal of a VRS sensor is an ac voltage that varies in amplitude and wave frequency as the speed of the monitored device changes, and is usually expressed in peak to peak voltage (Vp-p).

One complete waveform (cycle) occurs as each target passes the sensor’s pole piece. If a standard gear were used as a target, this output signal would resemble a sine wave if viewed on an oscilloscope.

Six application-specific series are available:

  • VRS General Purpose Series
  • VRS Hazardous Location Series
  • VRS High Output Series
  • VRS High Resolution Series
  • VRS High Temperature Series
  • VRS Power Output Series

Transportation: Thrumold Series


Documents

TITLE DOCUMENT TYPE LANGUAGE SIZE
Speed Sensors Line Guide Product Line Guide English 181KB
Speed Sensors Range Guide Product Range Guide English 767KB
VRS Industrial Magnetic Speed Sensors Application Note Application Note English 530KB
VRS Sensor Application Notes Application Note English 101KB
VRS Output Voltage Calculations Technical Information English 46KB
Magnetic Sensors Line Guide Line Card/Selection Chart English 359KB

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