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Automation Articles
Low-cost, inline, density measurement of liquids
[2009-04-16]

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The resonant frequency of the Liquiphant M's vibrating fork changes with the varying densities of the materials in which it is placed.

The resonant frequency of the Liquiphant M's vibrating fork changes with the varying densities of the materials in which it is placed.

Endress+Hauser has released the Liquiphant M sensor, which it claims makes possible the inline density measurement of liquids, and is designed for both food and beverage, and chemical and mining applications to reduce material wastage, increase product quality and optimise control of the process.

In process industries, many activities rely on accurate and reliable density measurement; this includes the dosing of preliminary, interim and final products; determining exact density or concentration; monitoring quality and controlling processes.

Food processing often requires the combination of multiple ingredients and progressively monitoring density enables operators to determine the exact amount of ingredient to be added.

Endress+Hauser has been using the 'vibrating fork' principle to monitor levels of liquids for over 30 years and, with its newly-developed, low-cost Liquiphant M, the company claims to have adapted this technology 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.

Sugar is widely used in food processing and accurately measuring its content (degrees Brix) is critical for cost efficiency and product quality. The associated Liquiphant FML621 density calculator displays this information in measurements relevant to the process, ºBrix for sugar, ºBaume for salts, ºPlato for brewing or any other density derived units specific to an application, says the company.

"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," said a notice from the company.

"Liquiplant M offers a cost-effective alternative and provides reliable inline density measurement at a glance. This allows immediate adjustments to the process and increases plant availability, improves process control and reduces material wastage."







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