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Surface water

Surface water

Olpas TSS and SSC 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.

The Olpas Watermonitoring sensor series provides a highly durable solution for water quality monitoring in challenging environments like sewers, combined sewer overflows (CSOs), and open waters.


Equipped with advanced fouling resistance and minimal sensor drift, these sensors are designed for fixed installations or mobile platforms such as boats and buoys, and can be mounted freely or within guide tubes for stability.

“Olpas watermonitoring sensors are the most economic choice when low-maintenance is required. A once-per-3-months maintenance action was enough, while our previous sensor required a once-per-week visit. The ROI of the Olpas sensor was less than 6 months!”

Maintenance Advantages & Cost Efficiency

Olpas Tentacle sensors are engineered for extended maintenance intervals, lasting up to four times longer than optical sensors. With exceptional fouling resistance and drift control the maintenance needs are minimal - even without automated cleaning mechanisms.


This resilience makes it the most cost-effective choice for sewer networks, WWTP influents, and other harsh environments.

A dirty Olpas sensor, covered with biofouling. The sensor still functions without drift, despite the build-up fouling buildup
An Olpas sensor after 3 months in open water, without any maintenance actions. Even without wiper or other mechanical cleaning, the sensor still functions well without noticeable drift.

Usage of Olpas Watermonitoring sensors

  • Monitoring Sewers and Sewer Overflows (sewage-side or nature-side)

  • Sediment runoff monitoring in canals and rivers

  • Monitoring TSS in influent for proactive WWTP adjustments

  • Ensuring compliance with discharge standards


Sensor Hardware

Olpas sensors for water monitoring are available as part of the Olpas Tentacle hardware series, consisting of a robust sensor with power&data-cable.




A communication node can be provided to collect and store the data, and to send it to a dashboard at regular intervals.


The dual-purpose Data Cable

The cable supports both power (via solar, batteries, or grid) and data transmission, ensuring reliable connectivity for continuous operation in remote or hard-to-reach locations.


Communication & Data Access

An optional communication node collects and stores data, sending updates to a dashboard at regular intervals for easy remote monitoring. The data communication uses open standards, allowing you to integrate the measurements 100% within your own systems. There is no obligation to use our software, no expensive monthly fees are required.




Applications in this field

An Olpas Sludge Concentration sensor installed at a WWTP

TSS - Total Suspended Solids

Total Suspended Solids (TSS) is the portion of not dissolved solid particles suspended in water.
This includes organic and inorganic materials, such as silt, decaying matter, industrial wastes, and sewage.

An Olpas Sludge Concentration sensor installed at a WWTP

SSC - Suspended Sediment Concentration

Thanks to the extended maintenance intervals, Olpas sensor for sediment concentration monitoring (Suspended Sediment Concentration or SSC) provide a cost-effective and IoT-ready solution for remote monitoring of sediment load in open waters and canals.

An Olpas Sludge Concentration sensor installed at a WWTP

TSS in Sewers and Overflows

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.

Available Products

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5

OTE-SEDA

OTE-SEDA

Water monitoring: Suspended Sediment Concentration (SSC)

Olpas SSC sensors use a novel proprietary 3-8 Mhz Accoustic Backscattering measurement technology for an exceptional wide coverage of particle sizes for its concentration measurement.  The sensors are pre-calibrated, drift-resistant and require very few maintenance.

OTU-SEDA

OTU-SEDA

Suspended Sediment Concentration (SSC) (inline mounting)

Factory callibrated sensor with Modbus interface. 

Extended transducer for easy installation and maintenance with Hot-Tap retractable.

OTU-TSSB

OTU-TSSB

TSS concentration (Inline mounting)

Factory callibrated sensor with Modbus interface. 

Extended transducer for easy installation and maintenance with Hot-Tap retractable.

OTE-TSSC

OTE-TSSC

TSS concentration in challenging environments

Olpas TSS sensors are pre-calibrated, drift-resistant and required very few maintenance; thanks to an industry leading fouling resistance and minimal sensor drift. 

OTU-TSSD

OTU-TSSD

TSS Low Concentration (Inline)

Low concentration TSS measurement (0 - 2.000 mg/L). Factory callibrated sensor with Modbus interface. 

Extended transducer for easy installation and maintenance with Hot-Tap retractable.

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