PMA engineers reviewing S3A analyser results together at an outdoor table

S3A suspended solids settlement analyser

One compact sample. Rapid MLSS measurement and automated sludge-settlement results for routine wastewater process checks.

Discuss your application Explore the dedicated S3A site

A clearer picture of sludge settlement from one sample

The S3A brings mixed liquor suspended solids and settlement measurements into one repeatable, sample-based test. It gives operators an MLSS result in approximately 10 seconds, then completes a 30-minute unattended settlement cycle.

Use the results together to compare activated-sludge concentration, settling behaviour and the clarity of the liquid above the settled layer. S3A supports operational decisions; it does not replace required compliance sampling or laboratory analysis.

PMA technician working with the S3A analyser and a laptop

Automated analysis without a manual jar-test watch

Prepare a representative 210 ml sample, start the test and review the MLSS result. The analyser continues to follow the settlement cycle, producing a set of connected results when the 30 minutes are complete.

210 mlSample volume

~10 secMLSS result

30 minSettlement cycle

Download the S3A brochure

Measurements

Five connected measurements

Review concentration, settlement and separation together rather than relying on a single reading.

Mixed liquor suspended solids

Check MLSS from 50 to 5,500 mg/L, with stated accuracy of ±10%.

Sludge Volume Index

Relate settled sludge volume to MLSS concentration after the complete test.

Settled sludge level

Record the level reached by the sludge through the 30-minute settlement cycle.

Supernatant clarity

Assess the solids remaining in the liquid above the settled sludge.

Floating sludge

Identify an indication of sludge rising or floating during settlement.

An optional stirrer adds SSVI and SSSL. These stirred results are not part of the standard unstirred workflow.

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A repeatable route from sample to result

CollectTake a representative activated-sludge sample from a consistent, safe process point.
StartLoad the 210 ml sample and begin the automated test.
ReviewRead MLSS first, then assess the completed settlement outputs in context.
CompareStore date- and time-stamped results by location for routine follow-up.

PMA engineers discussing the S3A analyser in a laboratory

Where S3A fits

Routine activated-sludge settlement checks are useful when samples and expected concentrations fall within the instrument specification.

Conventional activated-sludge plants

Compare MLSS and settling behaviour at representative points in the biological process.

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Sequencing batch reactors

Track comparable sample results through a defined operating and settling routine.

Membrane bioreactors and Anammox

Support routine activated-sludge checks where sample conditions suit the S3A range. The analyser does not monitor membrane condition or fouling.

Industrial effluent treatment

Review representative mixed-liquor and settlement checks in an industrial biological treatment stage.

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Food and beverage wastewater

Follow comparable results from the activated-sludge stage alongside production and cleaning records.

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Check the fit for your process

Use these core figures for an initial discussion, then confirm the sample matrix, operating conditions and current product specification with PMA.

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S3A core specification
MLSS measurement range	50–5,500 mg/L
MLSS accuracy	±10% stated
Sample volume	210 ml
MLSS result	Approximately 10 seconds
Settlement cycle	30 minutes
Result storage	28 results per location, three locations
Operating environment	Safe area; 0–45°C, noncondensing

Continue your S3A review

See the dedicated S3A site for measurement guides, applications and the full product workflow, or talk to PMA about a representative sample from your works.

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Looking after your world since 1971

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Expert Support

Knowledgeable,
experienced staff

Our team of dedicated field support technicians are vastly experienced in applications and installations. We understand how analysers work, why they were installed and what data they need to produce.

Part Request

Spare and
replacement parts

Scroll down to use our contact form to enquire about spare and replacement parts. If you do not know the part number or name, simply describe the spare part. Our team of expert engineers are here to help.

Datasheets

Requesting technical documents

Submit your details at the bottom of this page and include information about your application so our engineers can provide the relevant technical documents for your requirements.

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S3A suspended solids settlement analyser

A clearer picture of sludge settlement from one sample