Rion VM-240A Acoustical Volume Meter

SKU: VM-240A

Overview

The Rion VM-240A is a non-invasive instrument that measures volume of objects using acoustic detection. This instrument can rapidly measure the volume of irregular shaped objects without the use of liquids like in the traditional Archimedes Burette based methods.

Applications

Quality control for irregularities in machine parts
Measurement of volume for irregularly shaped objects

Features

Dry, non-contact method: No immersion in liquid is required, making it ideal for irregular shaped objects.
Measurements are completed in around 2 seconds.
Accuracy of measurement is within ±0.1 cm³ when measuring roughly 100 cm³ under standard conditions (20 °C, 50% RH)

Measurement Principle

The VM240A’s reference loudspeaker will generate a sine signal inside a sound source chamber.
This method works by taking measurements in two chambers—
- V₁: Sound source chamber with known volume.
- V₂: Combined volume of the attachment space plus the unknown object volume (V₂ =Vx + V₀).
Calibration via capacity reference containers (three) refines accuracy; for a 100 cm³ object, precision can reach ±0.1 cm³.
The system measures tiny changes in pressure (ΔP₁ in the known chamber and ΔP₂ in the test space) due to sound propagation.
The ratio of these pressure changes is proportional to the volume—allowing calculation of V₂, and thus the target object’s actual volume.
Beware of acoustic leakage. Even a small amount of dust can create a gap between the measuring chamber attachment and the measurement target which can render results unreliable.

Downloads

VM-230 and VM-240 Datasheet

Measuring the Capacity of an Engine Combustion Chamber Using Sound

Rion VM-240A Acoustical Volume Meter

SKU: VM-240A

The Rion VM-240A is a non-invasive instrument that measures the volume of objects using acoustic detection.