Online Ultrasonic density and concentration measurement Putten · 52.26° N 5.61° E 14:32:07 CEST
00 · Inline. Real time. No source.
Measure smarter.Operate with confidence.
Ultrasonic meters that read density and concentration inside the pipe and hand the number straight to your control system. Nothing to license, no controlled area, nothing to dispose of.
Density
1.483 SG
↗ +0.02 avg
Temperature
24.6 °C
Stable
Signal waveform
Live
Photo · Thickeners, mineral processing
Readings shown are an example
01 · Field facts
SRC · SDM ECO datasheet · company records
0
Radioactive sources
Nothing to license, no radiation officer, no source to dispose of at end of life.
vs · nuclear density gauge
24/7
Real-time inline data
Continuous readings over 4–20 mA or Modbus, so the control room sees the change as it happens.
Output · analogue + digital
40bar
Built for the process
Ceramic and Duplex 2205 wetted parts, IP68 transmitter, made for abrasive slurry and aggressive chemistry.
SRC · SDM ECO datasheet · 20 °C
1992
Founded in Putten
Every instrument designed, built and tested in the Netherlands. More than 1,000 density meters in service.
SRC · company records
Ultrasound does the job a radioactive source used to do. Without the paperwork.
A nuclear density gauge needs a licence, a radiation safety officer, transport permits and a disposal plan. An ultrasonic density meter needs a pipe.
How ultrasonic density measurement worksNuclear density gauge
- ×Radiation licence and annual audits
- ×Controlled area and trained radiation officer
- ×Source transport, wipe tests, disposal at end of life
- ×Slow response to density swings
Rhosonics ultrasonic
- ✓No licence, no audits, no controlled area
- ✓Fits any flange or wafer, commissioned in a day
- ✓Same accuracy in side-by-side field trials
- ✓Faster response, so control loops can act on it
02 · Instruments
Three meters. One question: what is in the pipe?
Slurry or chemical, density or concentration. Each instrument is built for its medium, and all three speak to the same control system.
02.1 · Slurry density
SDM ECO
Slurry density meter for mineral processing, dredging and tailings.
- Accuracy±0.5 %
- Pressure40 bar
- Temp0–110 °C
- RatingIP68
Non-intrusive ultrasonic sensor with ceramic and Duplex 2205 wetted parts. Built for abrasive slurry, high-density lines and large pipes.
Explore SDM ECO
02.2 · Chemical density
CDM series
Density, suspended and dissolved solids in chemical slurries and liquors.
- Rangeto 2,500 g/l
- SensorsPEEK
- Models9670 · 9680
Corrosion-resistant sensors for small lines and harsh environments: phosphoric acid, brine, leach liquor, lime slurry.
Explore CDM
02.3 · Chemical concentration
CCM series
Concentration of up to three chemicals in one bath.
- Species1–3
- Models8500 · 9500 · B30
- WettedChemical-resistant
For wet benches, plating lines, pickling and blending: sulphuric acid, TMAH, caustic, copper and zinc electrolytes.
Explore CCM
03 · Industries
Wherever something flows through a pipe, there is a reading to be had.
Four industries make up most of the installed base. Each row lists the applications we measure there and the instrument that fits.
03.1
Mineral processing
Grinding circuit density, flotation feed, thickener underflow, tailings and paste, leach and CIL tanks, pipeline transport.
03.2
Semiconductor and display
CMP slurry, wet clean and etch baths (SC1, SC2, SPM, HF, BOE), TMAH developer, flat panel wet process lines.
03.3
Chemicals and fertilisers
Phosphoric and sulphuric acid, caustic soda, brines and electrolytes, chemical blending and distribution.
03.4
Ore refineries
Bayer liquor and red mud, leach liquor and raffinate, lime and limestone slurry, precipitated products.
04 · Proof
Run side by side with the nuclear gauge. Same density, faster answer.
A chrome and PGM concentrator on the Bushveld Complex trialled the SDM ECO on thickener underflow before committing. Its trend matched the installed nucleonic meter and moved first when the density moved.
Density trend · thickener underflow · 24 h
SDM ECO Nuclear gauge
Illustrative trend based on the trial report
Full data in the case study
What the trial showed
- Site
- Chrome and PGM concentrator, Bushveld Complex, South Africa
- Application
- Thickener underflow, SDM ECO wafer sensor
- Compared with
- Installed nucleonic density meter
- Outcome
- Same accuracy, faster response, no licence
Used across operations worldwide
05 · Company
Built in Putten. Used around the world.
The people who design the sensors are the people who answer the phone when you are commissioning one. Partners across mining, chemicals and semiconductor production put someone local on site.
52.26° N5.61° E
Hoge Eng West 30, Putten, the Netherlands. Design, build and test under one roof.
1,000+ meters
Density meters in service on five continents.
ISO 9001
Quality management certified by DEKRA.
06 · Insights
Practical thinking from the field.
06 · Latest
Thickener Underflow
SDM ECO compared to nuke in thickener underflow
06 · Latest
Rhosonics at Industry Events 2026
In 2026, Rhosonics Expands Global Reach by Showcasing Ultrasonic Process Solutions at Premier Industry Events.
06 · Latest
Real-Time Control in the Flotation Circuit: The Key to Stable Recovery
Maintaining stable process conditions is critical for efficient flotation. With the right instrumentation and integrated automation stable process conditions can be maintained at all times, yielding optimized results.
Got a process challenge?
Discuss your process with our team. Include the medium, pipe size and operating conditions, and an engineer will tell you which instrument fits and what to expect.