Compare online density with representative samples when the feed blend or recycled water changes. Build a useful review with PMA.
Sand recovery, classification and fines handling can all involve a changing mixture of water and mineral solids. An online density trend can help the operator see those changes between samples. The Rhosonics SDM ECO supplies a non-nuclear density measurement; its suitability still depends on the slurry and installation.
This application focuses on checking the meaning of that signal in an aggregate wash plant. Keep the measured density, the reference result and the material being processed together. That makes it easier to distinguish a change in the stream from a comparison that used different material or conditions.
Start with one defined duty, such as cyclone feed or fines-slurry transfer. Record the operating decision the reading needs to support before selecting the sensor position.
Use a repeatable observation record across normal running and material changes. Agree the reference method, sampling arrangements and acceptance criteria with the responsible team.
Density in kg/m³ and dry solids as a percentage by mass describe different quantities. A conversion needs an agreed model for the solids and carrier liquid; it should not be assumed to apply to every feed blend.
Suppose the recorded online density is 1,440 kg/m³ and a matched sample gives 1,420 kg/m³ on the agreed basis. The recorded difference is +20 kg/m³.
Keep that difference with the sample time, temperature, method and operating state. One pair does not establish accuracy over the plant’s operating range or show why the results differ.
If a different feed gives a changed dry-solids result, first check whether the solids and liquid properties used in the conversion still represent that mixture. A density-to-solids relationship may need a separate review from the meter’s density calibration.
Repeat comparable observations across the intended material range. Keep each blend identifiable so its behaviour is not hidden in a single pooled average.
Check that the sensor and sample represent the same stream, the timestamps and temperature basis agree, and the reference method reports the same quantity. Send the paired records to PMA with the existing configuration. Rhosonics publishes a multi-point calibration approach; the applicable software, procedure and reference measurements must be confirmed for your instrument.
Send PMA the process drawing, pipe and fitting details, material variability, expected range and paired sample records. Include the required outputs and the action the operator should take when the signal is unavailable.
Review the measurement principle and discuss the fitting, outputs and commissioning evidence for your slurry.
Read Rhosonics’ explanation of multi-point calibration and the reference density measurements it requires.
Rhosonics documents earlier SDM use at the Beni Amir phosphate washing plant. That provides process context, not evidence of an SDM ECO trial at a UK aggregate site. The example above is hypothetical and is not taken from that installation.
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