Measure slurry density inline with non-nuclear ultrasonic technology. Plan the right installation with PMA support.
The Rhosonics SDM ECO provides continuous density information for water-based slurry processes without a radioactive source. It is designed for demanding mineral-processing and dredging environments, with a ceramic sensor face and a choice of process fittings.
Density trends can help operators understand changes in cyclone feed, thickener underflow, tailings transport and quarry wash circuits. Pair the measurement with flow, pressure, pump state and representative samples to interpret what the process is doing.
PMA can review whether SDM ECO suits your slurry and help specify the mechanical integration, outputs and commissioning evidence.
The sensor measures acoustic impedance at the interface between its face and the slurry. Ultrasonic energy reflected at that interface is used, with temperature and the product calibration, to calculate density. This is different from a through-pipe ultrasonic velocity measurement.
Obtain a density trend without a radioactive source or source-related radiation arrangements.
Choose a wafer, spool-piece, weld-o-let or clamp-in arrangement around the pipework and service conditions.
Review density and temperature locally, and specify the analogue or digital connections your team needs.
Match the selected sensor and analyser to the process. PMA can confirm the current configuration and supply the relevant technical documents.
Ultrasonic acoustic impedance and temperature; density in kg/m³ and temperature in °C.
Manufacturer brochure: ±0.5%. Review calibration, representative slurry conditions and acceptance criteria for the installation.
Published sensor range: 0 to 150°C. Confirm pressure, material compatibility and the selected fitting for the duty.
IP68 / NEMA 6P. The separate HMI is rated IP65 / NEMA 4; these are different enclosure ratings.
7-inch touchscreen; published HMI outputs include two 4–20 mA channels, Modbus RS485 and Ethernet.
USB retrieval is available through the HMI. Wafer, spool-piece, weld-o-let and clamp-in options require pipe-specific selection.
Review grinding circuits, hydrocyclone feed, thickener underflow and tailings density monitoring.
Track solids loading in sand recovery, washing and slurry transfer; validate against the actual mineral mixture.
Support sediment-transfer or bentonite-recovery decisions. Density and flow must be aligned for mass calculations.
The location must remain representative of the process. Check pipe fill, air, settling, abrasion, access and the relationship to the sampling point before selecting a fitting.
PMA has supported process measurement and analysis since 1971. We bring the instrument, the installation and the measurement objective together.
Share your process conditions with our team. We can help with product selection, application review, commissioning and ongoing support.
Read the public Rhosonics brochure for the measurement principle and published technical information.
Explore PMA’s dedicated ultrasoundmeter.co.uk product information and application library.
Review the application, installation questions and reference evidence for your process.
Rhosonics describes an SDM ECO installation at Grupo México’s Charcas site to monitor tailings-thickener underflow and support pumping decisions. The case provides useful questions for a trial; it does not establish performance for a different slurry.
No. Compare the measurement principles against the slurry, location, operating range and acceptance evidence. An existing mounting position or calibration may need to change.
Rhosonics documents suitable configurations, but the sensor position, fitting and flow behaviour must be reviewed. Do not assume every partially filled line is suitable.
A density reading can support a solids calculation when the carrier liquid and solids properties are known and sufficiently stable. It is not a universal direct measurement of TSS for every mixture.
Send slurry composition and range, pipe dimensions and material, pressure, temperature, flow conditions, possible air or abrasion, required outputs and the proposed reference sampling method.
Choose by measurement objective, process medium and installation requirements.
Hybrid ultrasonic analysis for application-specific density, suspended solids and dissolved solids duties.
Inline measurement of one chemical concentration using ultrasonic velocity and temperature.
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