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For extremely accurate belt tension measuring, the Gates Sonic Tension Meter is an electronic device that measures the natural frequency of a free stationary belt span and instantly computes the static belt tension based upon the belt span length, belt width and belt type.


Can be used for synchronous and V-belts

Uses sound waves instead of force/deflection

Results are repeatable with any operator

Portable, lightweight and easy to use

Fast. Calculates tension in seconds

Can be used in almost any environment

Model 508C runs on two AAA batteries



Correct belt installation tension is essential for optimum performance and reliability of multi-ribbed, V-belt and synchronous belt drives. The 508C sonic tension meter ensures simple and extremely accurate tension measurement by analysing sound waves from the belt through the sensor. It processes the input signals and displays the accurate tension measurement digitally. Gates’ tension meter is user-friendly: it is compact, computerised and stores data for repetitive use. Gates’ sonic tension meter measures belt tension accurately every time. It is supplied with a handy instruction manual.


  • Suitable for multi-ribbed belts, V-belts and synchronous belts.
  • CE approved.
  • RoHS 2 complaint: the device complies with the European Directive (2002/95/EC) on the restrictionof the use of certain hazardous substances in electrical and electronic equipment.
  • Batteries: 2 x AAA.
  • Measurement range: 10 Hz to 5,000 Hz.
  • Measured accuracy: ± 1%.
  • LCD screen backlight.
  • Double display possible (Newton and/or Hz).
  • Flexible flat sensor (standard
    included – PN 7420-00205).
  • Stores weight, width and span constants for up to forty different drive systems.
  • Auto gain adjustment function automatically eliminates background noise.
  • Cord sensor and inductive sensor available on request.
  • Compact model (H 160 mm x D 26 mm x W 59 mm).
  • Use and storage temperature range: -10°C to +50°C (free from condensation)


  • CORD SENSOR (PN 7420-00206)
    The cord sensor is recommended for measuring
    tensions at a distance from the tension meter.
  • INDUCTIVE SENSOR (PN 7420-00212)
    The inductive sensor is recommended for
    measurement particularly in noisy or windy
    environments. A steel clip to the back of the belt
    is required to measure the vibration frequency.
  • PACKAGE OFFERING (PN 7420-10508)
    Sonic 508C + Inductive sensor + Magnets.


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