Pulp and Paper

Rhosonics has developed products that are suited for measuring properties of slurries and liquids used in the production of pulp, paper, and fibers. Using a single sensor positioned in line, it is possible to determine the dissolved and non-dissolved components. Almost 90% of slurries common in the pulp and paper industry can be measured by Rhosonics.

General paper process

Concentrations are measured by determining the velocity of sound through the slurry, such as the polymer concentration or a particular acid or alkaline concentration. Our model 8500 can perform these measurements in combination with a specially designed sensor.

In coating slurries, we can measure the following properties: TDS, TSS, and density using our model 9670 or model 9680. For low consistency measurement (for example head box), our model 9670 and model 9680 can be used. Unlike well-known consistency sensors, the equipment produced by Rhosonics does not drift and requires less maintenance and/or calibration.

Have a look at our models or get in touch with us for more information.

Green & white liquor alkali concentration & total suspended solids

The Kraft Process is all about the conversion of wood into wood pulp. Wood chips are mixed together with white liquor. During this process, black liquor (spent liquor) is formed and wood pulp is produced. Black liquor is processed and treated until green liquor is formed. The use of lime milk can turn this green liquor into white liquor again so that it can be reused.

In this process, Rhosonics can measure the green and white liquor accurately. Monitoring the alkali concentration throughout the Kraft Process is important, as is monitoring flow rates, contact time, and ultimate cost effectiveness of the pulp mill. Our models 9670 and 9680 measure TDS (alkali) and TSS (amount of solids). One advantage of using ultrasonic technology is that you can measure two important properties using just a single device, which also allows for greater accuracy, as well as less maintenance and calibration. The sensor is also less Sensitive to pollution.

COD in sewage

In-line and continuous monitoring of COD (Chemical Oxygen Demand) in waste water treatment plants is essential for improving the efficiency of biological treatment plants. Rhosonics has developed an extremely efficient method to measure the COD of industrial waste water, eliminating high operating costs and frequent and complex maintenance tasks.

Our model 9585 reduces the overall operating costs and makes it simple to comply with conditions for discharge consent. This optimization tool for your biological purification process can be installed in a pipe line or in a reservoir, filtration unit, or launder. Together with a conductivity sensor and a very sensitive diver sensor it can measure the COD with a high degree of accuracy. The COD value – which is continuously available using in line sensors – is not affected by the hardness, the presence of detergents, or suspended solids in the influent and effluent streams. Rhosonics Model 9585 employs a hybrid ultrasonic sensor measuring a number of ultrasonic properties of the water. In conjunction with the electrical conductivity, an ultrasonic equivalent value provides the basis for the actual translation into the COD value of the water.

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