Sonic Belt Tensioning Meter

Unlike the force deflection method which involves applying force to the belt, the Gates Sonic Tension Meter measures belt tension by analyzing the harmonic characteristics of a vibrating belt.

Belts, like strings, vibrate at a particular natural frequency based on mass and span length.

Flexible Flat Sensor for SI-86 Sonic Belt Tensioning Meter


The Sonic Tension Meter can easily be operated by one person for fast, accurate readings on all types of synchronous belt drive systems and V-belt drives.

Simply enter belt mass constant, belt width and span length* into the meter using the built-in keypad. Next, hold the meter sensor just above the belt and lightly strum belt to make it vibrate.

Press “measure” button to obtain the reading as a frequency (as hertz) or as a force (pounds or newtons).


Sonic Belt Tension Meter for Pulleys

Consistent, accurate tension readings every time
Compact and light
Easy to use
LCD screen with black light
Output readings measurable in hertz, pounds or newtons
Improved frequency range from 10 – 5000 hertz
20 memory registers for belt constants
Gates product number 7420-0507
This device works on any type of synchronous belt drive system, including V-belt drives.

Anyone can operate the Sonic Belt Tension Meter by inputting the belt width and length, and then holding the sensor near the belt to measure its vibration.

It can measure a frequency range of anywhere from 10-5000 hertz, and has 20 memory registers for belt constants. To make things simple, it has a clear LCD display screen with a black light.


Belt Installation and Maintenance Toolbox

508C Sonic Tension Meter