Tension Meter

The Unitta U-550 belt tension measuring device is a Sonic tension meter made by Unitta in Japan. It specializes in measuring the tension of various types of belts. The measurement principle relies on the vibration of the belt, and the device analyzes the vibration frequency to provide accurate results.
The Unitta U-550 belt tension measuring device uses a sensor to detect the sound waves (natural frequency) generated by the belt and can precisely measure the belt tension.
Since timing belts transmit energy by meshing, they do not require high tension like friction belts. However, 'excessive tension' can lead to reduced lifespan and noise, while 'insufficient tension' can result in slipping. Using the U-550 sound belt tension measuring device helps manage the correct tension of timing belts to maximize their performance."

Basic function of acoustic tension meter

-**High Sensitivity Microphone :** Equipped with a high-sensitivity microphone in the low-frequency range as per the standard. It is effective for large belts with long pitches.

-**Computer Output Function :** The measured results stored in the device's internal memory can be easily exported to a computer with a simple touch using a USB cable.

- **Pre-set Unit Weight Values:** Data for 69 types of belts manufactured by Gates, Unita, and Asia is pre-set, allowing unit weight values to be displayed instantly by specifying the belt type.

- **Wide Frequency Measurement Range:** Three-step range switching enables measuring a wide frequency range from 10 to 5000Hz.

- **Automatic Trigger Function:** When you press the "MEASURE" button, it comes equipped with an automatic trigger function, enabling continuous measurements by simply flipping the belt.

- **Compatibility with Tight Spaces:** The sensor (microphone) is a small, single-pole microphone, making it easy to measure even in tight spaces. Four types of microphones are available as optional items. Please check the back cover for details.

- **Large Internal Memory:** Equipped with a substantial internal memory function, capable of recording 500 measurement results and 40 measurement conditions.

- **Automatic Background Noise Reduction:** From the moment you power it on until you press the "MEASURE" button, the ambient noise level will be periodically measured, and the microphone sensitivity will be automatically adjusted. Pressing the "MEASURE" button will reset the microphone sensitivity.

- **Measurement Result Evaluation Function:** Upper and lower limits can be set to determine the measurement results for 40 measurement conditions that can be recorded inside the main unit.
*Requires operation on a PC.

- **Auto Power Off Function:** The auto power-off function will automatically turn off the device about 5 minutes after the last measurement, preventing battery waste from forgetting to turn it off.

- **Horizontal Microphone**

  (Product Code: TM-YOKO)
  The horizontal microphone has a microphone located at the side, allowing measurements even in tight spaces between the back of the belt and the machine.
  (Thickness 10.0mm x Width 20mm/Total Length 170mm)
- **Long Arm Microphone**

  (Model Number: TM-LONG2)
  This type features a longer arm (total length 350mm) compared to the standard microphone (total length 170mm).
  (Outer diameter of the microphone φ 12.5mm/Total Length 350mm)
- **Wired Microphone**

  (Product Code: TM-COM)
  The 1m long wired microphone can measure belts deep inside machinery that are challenging for the standard microphone to reach.
  (Outer diameter of the microphone φ 12.5mm/Total Length 1m)
- **Electromagnetic Sensor**

  (Product Number: TM-DGS)
  This sensor records changes in force rather than sound waves, allowing it to measure steel wires, steel belts, and more. Even in environments where rubber belts are affected by noise (background noise) and are typically hard to measure with a microphone, measurements can be performed by applying a thin magnetic material (to the extent that it does not affect the natural frequency).