Inductive distance measuring sensors AlphaProx

Highly precise, efficient and robust sensors for process automation

Inductive sensors of the Baumer AlphaProx family are the perfect solution for reliable non-contact measurement of changes in the position of metal objects. Thanks to their high temperature stability in connection with large measuring distances, the high degree of consistency and their robustness, the sensors are ideally suited for measuring positions and angles, controlling and monitoring belt tension, controlling sag and measuring low-frequency vibrations.

  • Portfolio
    • Sensors with linearized characteristic

      • Constant sensitivity over entire measuring range
      • Individually teachable measuring ranges for fast and easy installation
      • Extremely low deviation from sensor to sensor
      • Programmable digital output

      High-precision sensors

      • Very high resolution in the nanometer range
      • High temperature stability

      Hygienic and washdown-Design

      • FDA-compliant, Ecolab-tested
      • IP 69K
      • Long-term seal thanks to proTect+ impermeability concept


      Robust sensors

      • Robust stainless steel housing
      • IP 69K
      • Extremely robust and durable thanks to Baumer proTect
      • High signal quality in an extended temperature range
    • Miniature sensors and short designs

      • Completely integrated processing electronics
      • Easy installation in tight spaces 
      • Different rectangular (5x5, 8x4.7mm) and cylindrical designs (ø4, ø6.5, M8)
      • Short cylindrical designs with lengths up to 22mm


      Standard sensors

      • Dimensions from 4 to 30 mm for every requirement
      • Absolute distance measurement up to 16 mm
      • Completely integrated processing electronics

      Sensors for the ex-area (ATEX)

      • ATEX certified for explosive dusty atmospheres (2D zone 22)
      • Highest repeatability
      • Compact design


      Customized Sensors for low TCO

      • Individual output curves
      • Low-power variants
      • Sensors for safety applications
      • Special designs 
    Areas of application

    • Tape tension control and monitoring

      • High control quality at high frequencies possible
      • The sensor performs two functions: distance measurement (analog) and end position shut-off (digital)
      • Through teach-in the sensor measuring range can optimally be adapted to different roller diameters

      Vibration measurements on shafts and bearings

      • Bearing play or true running measurements
      • Measurement of distances to 1 μm
      • Mounting is possible even in extremely limited spaces (amplifier is integrated in the sensor)
      • Very rapid movements can be measured
      • Miniature sensors also available in a connector version

      Absolute distance and angular measurement

      • High reliability thanks to contact less measuring
      • Dirt-resistant measuring system
      • Measurement of linear and rotary movements possible
      • Compact sensor sizes allow mounting even in limited spaces
    Special features
    • Miniature housing

      Featuring a diameter of 4 mm, the IWRM 04 may be referred to as the smallest distance measuring inductive sensor with an integrated amplifier.

      Flexible thanks to teach-in

      Sensors with a teach-in input can optimally be adapted to the respective application conditions. Both the analog output and an additionally integrated switching output can be configured with the very easy teach-in routine.

      Temperature-stable at large measuring distances

      Baumer sensors feature high temperature stability at large measuring distances. Over 80% of all industrial applications are exposed to temperatures between +20 … +50° C. In the 0 … +60° C range, these sensors have a negligible temperature drift.

      Very high EMC

      Resistance to electromagnetic disturbances is an important factor when it comes to the practical use of sensors. The EMC limit values of Baumer sensors considerably exceed sensor standard specifications, guaranteeing very high operational safety.