Rhosonics helps the industry to use ultrasonic technology for in-line, real-time measurements, through which a process optimization can be achieved, allowing a safer, more reliable, sustainable and cost effective operation. This is how Rhosonics contributes to a smart and green world.

On this page, you can read about our models and applications in the following industries:

Wastewater Management

Wastewater treatment plants are common over the world. Within the wastewater treatment process, it is important the measure the COD (Chemical Oxygen Demand)value, i.e. the amount of oxygen necessary to break down organic materials. The Rhosonics Model 9585 ​COD Meter can be used to measure the COD of brewery wastewater streams.

Fluctuating loads will upset your treatment plant and will lead to bad treatment and can cause foaming. Measuring the COD using a high quality Model 9585 ​COD Meter can help you check your treatment plant by means of feed forward control of the air compressors and increasing the return activated sludge (RAS). COD can also be toxic for bacteria above a certain concentration: inhibition of bacteria will lead to poor wastewater treatment or can upset the treatment completely.


Rhosonics’s range of products is especially suited for the chemicals industry. Applications for Rhosonics sensors are numerous, as the devices can be made of any material. Our sensors can determine, for example, liquid concentration, TDS (Total Dissolved Solids), or TSS (Total Suspended Solids). We can assist you when it comes to measuring the main process, clear liquids, turbid liquids and slurries. Select your particular industry or type of business from the menu to get suggestions for applications and solutions.

Acids and bases

Rhosonics has been providing ultrasonic chemical concentration measurement sensors for more than two decades. We have developed a large number of applications for measuring acids and bases for companies all over the world. This means that we have acquired an unmatched level of expertise in this industry. Whether you are interested in the measurement of sulphuric acid (H2S04) or hydrofluoric acid (HF), Rhosonics can provide online, insitu measuring systems. Other examples of liquids that we are often asked to measure include maleic acid, citric acid, HBR, silane, and boric acid.

Rhosonics has experience working with the following chemicals:

  1. H2S04/Oleum
  2. Boric acid
  3. Phosphoric acid
  4. Hydrochloric acid
  5. And many others

Salts and other chemicals

Ultrasonic technology enables measuring of additive salts and other chemicals in a liquid such as water. Salt concentration in water has an effect on the velocity with which sounds travels through the liquid. By measuring the velocity of sound, it is possible to measure even low concentrations accurately.

Some of our best known applications are listed below. These applications include chemicals such as alcohols (such as ethanol, methanol, and isopropyl alcohol):

  1. Hydrogen peroxide
  2. Potassium hydroxide
  3. Potassium carbonate
  4. ITO-etch
  5. Potash
  6. Sodium sulfate
  7. Sodium chloride
  8. Sodium hydroxide
  9. Ammonium fluoride
  10. Ammonium hydroxide
  11. And many others

Fine chemicals

Fine chemicals are produced in small volumes and tend to be used as base materials for specialty chemicals.

These fine chemicals are liquids designed for a special application, where sometimes regular chemicals are not well suited for the production process. In other cases, recipes for production processes are especially created for the customer and for that reason a company secret. Rhosonics offers programmes to measure these kinds of fine chemicals using ultrasonic technology to check different parameters, such as concentration, temperature, solids, and density of the liquid.


These liquids are used to change the surface tension between two liquids or between a liquid and a solid. They are key components in detergents, paints, adhesives, inks, and numerous of other applications and industries, including the paper industry. Since there are many types of surfactants, but most of them can be measured with ultrasonic sensors.

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 9680can 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. Click here to read our newsitem about applications in the Indonesian Paper Industry.

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 measures 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.

Contact us for more information »