Inline liquid density measurement

With Liquiphant M, Endress+Hauser has used the ‘vibrating fork’ principle of liquid level measurement to enable the accurate and in-situ measurement of liquid density. The resonant frequency of the Liquiphant M’s vibrating fork changes with the varying densities of the materials in which it is placed. This change is used to compute the density or concentration of the medium resulting in instantaneous, repeatable density measurements.

In food and beverage, chemical and mining applications, this density measuring sensor can reduce material wastage, increase product quality and optimise control of the process through the measurement of density inline.

Plants typically invest in extensive offline procedures and expensive laboratory analysis to determine concentration levels. The time interval between taking the sample and getting the analysed results with an offline process often resulted in wastage and poor quality product as remedial action was delayed.

Density measurement is also critical in mining applications where the flocculent is added to a liquid to make solids ‘stickier’. The solid particles adhere to others, become heavier, drop to the bottom and are extracted. The Liquiphant M can be used to accurately control the rate and amount of flocculent and thereby minimise waste.

A Liquiphant device can also be used as a dual-purpose probe — to measure density and monitor liquid levels. A typical application is dry-run protection where a density measuring probe switches over to measure level at the end of a process and advises the operator to stop the pump once the vessel is empty.