Reliable suspended solids measurement

Measuring suspended solids and various other parameters in fluids using our proprietary innovative ultrasound measurement technology

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Water Monitoring

Olpas has products for these fields

Olpas is best know for products in the fields of water treatment, water monitoring and sludge dewatering. Focus is on measuring concentrations, but also viscosity and other parameters.

Sewers, Overflows (CSOs / SSOs) and Stormwater

TSS sensors deliver real‑time concentration alerts in sewers and overflows (CSOs/SSOs). The best in industry for resistance to fouling and drift.

Hydropower

Olpas acoustic backscattering sensors (ABS) track sediment loads, protecting turbines with durable, low‑drift measurements. From millimeter to sub-nanometer particles.

Wastewater

Olpas sensors for water treatment are especially used for challenging measurement: high loads (ex. influent or activated sludge), with exceptional drift resistance and longer maintenance windows.

Drinking water & Water supply

The OLPAS measurement technology allows a reliable measurement in a wide range of concentrations. For membrane protection, drinking water production or process water.

Surface water

SSC and TSS sensors monitor suspended solids and sediment in open waters in a wide range of particle sizes, independent of temperature changes or changes in water colour, and with season‑long accuracy.

Industrial Water

In industrial processes, inline ultrasound TSS measurements ensure precise control of slurry and wastewater. The unparrallled fouling resistance and the hot-tap mounting support boost efficiency.

Sludge Dewatering

We provide sensors for a complete insight into your sludge dewatering process by measuring sludge concentration, monitoring filtrate/centrate quality (TSS and residual polymers) and Dry Solids (%DS) in dry cake.

All Fields

Most popular Olpas applications

Activated Sludge

TSS (Total Suspended Solids) is the most important water quality indicator. Olpas’ industry-leading fouling resistance makes measuring TSS economically manageable in challenging environments like sewers, overflows, CSOs, and remote open waters.

Sewers and Overflows

Measuring Suspended Sediment Concentration (SSC) helps evaluate transport dynamics and erosion impacts, supporting environmental monitoring and sediment management in hydrodams, rivers, lakes, coastal systems and canals.

Sediment monitoring

Tracking solids (TSS) or PE (Polymers) ensures regulatory compliance, protects aquatic life, and evaluates treatment performance before water is discharged to the environment.

Effluent

Measuring solids (TSS) in influent helps estimate loading rates, optimize treatment plant design and detect abnormal discharges or pollution early.

Influent and sewers

Monitoring filtrate or centrate ensures dewatering efficiency, optimizes centrifuge/filter performance, and prevents downstream process issues caused by carryover of suspended solids or residual polymers.

Centrate / Filtrate monitoring

All Applications

Are you active in dewatering / sewage water / industrial wastewater / watermonitoring in nature or sewers / chemical processes / ...

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Articles and blogposts

20 May 2025

Monitoring TSS (Total Suspended Solids) in effluent discharge

20 Feb 2025

Feed-forward control of sludge dewatering

14 Feb 2025

Olpas measurement solutions for sludge dewatering optimization

23 Sept 2024

Measuring Suspended Sediment Concentration (SSC) in a canal: Insights from our Monitoring Sensors

9 Sept 2024

TSS or %DS in 'challenging environments': Iron Sludge

24 Jul 2024

Sediment Concentration in an open river: a challenge for low maintenance high accuracy measurements

16 Jul 2024

Sewage overflows during the Paris Olympics

24 May 2024

Launching the Olpas suspended sediment concentration (SSC) sensor

All Articles, News and Blogposts

Olpas is more than technology...

Olpas is more than innovative ultrasound technology. We develop the technology, build products using it, and are innovation partners for companies that want to incorporate OLPAS technology in their products.

An Olpas sensor, still functioning while covered with precipitation

Patent Pending Technology

Olpas engineers working on the Olpas sensor

Olpas is your innovation partner

A flow cell with an Olpas sensor measuring TSS and residual polymers

Economic online measurements in Sludge Dewatering

Innovative Technology

Due to the nature of the OLPAS technology using ultrasound backscattering, an intrinsic measurement of the solids concentration is obtained. The ultrasound pulse propagates in the fluid and the resulting backscattering echo is a representative fingerprint of the suspension concentration.

Ultrasound backscattering is independent of optical parameters, flow conditions, temperature or colour of the medium.

Easy to install

A low power, intrinsically safe, ultrasound pulse is sent into the medium. The backscattered echo is recorded by the transducer itself, allowing easy mounting of the transducers in any situation.

The transducer is no bigger than a pen.

Long maintenance window

Due to the ultrasound pulse used in Olpas measurements, fouling resistance of the Olpas sensors is far superior to competing technologies. So no 'wipers', 'pressured air' or other automated physical cleaning instruments are needed.

In general no re-calibration of the sensor is needed as long as the physical properties of the sensor stay intact.

Economic solution

Olpas sensors are both CapEX and OpEx friendly. Buying or renting a sensor is in general cheaper compared to alternatives. Easy installation and long maintenance intervals guarantee a lower OpEx.

We love working together with our partners to co-develop even better economic solutions for their specific needs.

Want to know more? Get in touch today!

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Our Partners

We are in good company: Olpas is supported by...