Liquid density meter

The density units are kg/m ³ and g/cm ³, and the liquid density unit commonly used in industry is g/cm ³. The measurement methods for density include float type, weight type, radiation type, etc. Here, only differential pressure type and vibration type are introduced.

Differential pressure densitometer

Measurement principle of differential pressure liquid density meter

Vibrating liquid density meter

Utilize the functional relationship between the transverse free vibration frequency of the catheter and the density of the liquid inside the catheter (filled with the catheter). When a conduit filled with liquid is vibrated perpendicular to the axial direction, a conduit filled with liquid and having the same cross-section can be regarded as a transverse vibration of an elastic body whose mass changes with the density of the liquid. Density changes can be converted into vibration frequency changes for measurement. In the following example, a density of 0.5-2.0g/cm ³ can be measured.

Principle formula

Fx:Lateral free vibration frequency (Hz) for ρ x
C: Constant dependent on vibration mode
L: Length of the vibrating section of the conduit (m)
E: Longitudinal elasticity coefficient of the catheter (N/m ²)
ρ 1: Density of the conduit (kg/cm ³)
ρ x: Density of the measuring liquid (kg/cm ³)
D1: Outer diameter of catheter (m)
D2: Inner diameter of catheter (m)

The principle of vibrating densitometer