SDM: Slurry Density Meter
After years to be successful with model 9690, Rhosonics introduces the latest generation density meter, the SDM series. This instrument is suitable for density measurement in all kinds of slurries. The product differentiates itself with its sustainable technology and its specific design for dredging and mineral processing applications.
Dredging and mining companies are increasingly looking for non-nuclear measurement equipment. A growing demand is seen for non-nuclear alternatives, because of stricter government regulations, safety related costs and the need to reduce nuclear waste. The SDM makes use of non-intrusive ultrasonic sensors to measure the real-time density of mineral slurries. Like nuclear density gauges, the SDM is able to measure under high density levels and at very large pipes.
By measuring the acoustic impedance of a slurry, the SDM calculates the density of the slurry in-line during the process. The sensor is made of stainless steel and ceramic material. Because of the new sensor material, the sensor has lots of better properties. By making use of ceramics material, the ultrasonic signal is more brightful and powerful than before. Also, the sensor is at least as wear resistant as its predecessor, model 9690. By means of wafer cells, spool pieces or even a weld-on piece, installation is possible at very large pipe sizes like 32” and even higher.
Get in touch with Rhosonics for further information about the Slurry Density Meter (SDM).
Features and benefits
- Non-Nuclear technology
- Real-time density measurement
- Durable probe system
- Lowest possible maintenance needs
- High accuracy and reproducibility
- Suitable for all types of slurries
- Compact integrated system
- Process connection via HART and 4-20mA
- Continuous data & system logging
- New temperature technology
Ultrasonic Spectral Power /
700 … 3.000 g/l
S.G., Density g/l
Up to 0.005 S.G … +/- 0.5%
1 to 99 s (adjustable)
Monochrome display with RGB backlight, visible through glass cover.
Push-buttons, HART, Computer
1 … 16 bar
0 °C … 110 °C (32 °F … 230 °F)
Ceramics and Duplex Stainless steel 1.4462
18 … 32 VDC, 8 Watt
Optional: Power supply/converter for 90 … 240 VAC
4 … 20 mA / HART
2-way through HART protocol
Data logging & fault reporting:
via USB memory stick
3X M16X1.5, cable OD Ø 3-10 mm
-20 °C … +65 °C (-4 °F … 149 °F)
< 95% at 40 °C (noncondensing)
IP68, NEMA 6P
Resistant to moderate / high vibration of pumps
Dimensions and weights
Approx. 6.4 – 6.8 kg
Coated stainless steel
218–402* (L) x 208 (W) x 170 mm (H)
* Various depths, depending on probe type
Spool (sensor depth: 16 mm)
Weldolet (sensor depth: 34 or 52mm)
Wafer (sensor depth: 146 or 200 mm)
DIN/ANSI/JIS (others on request)
Nominal pipe size:
Up to 60”
Get in touch with Rhosonics for further information about the SDM slurry density meter.
RCU Remote Control Unit / Communication Protocol Converter
The new Rhosonics instruments, like the SDM, are supplied with a sensor, display and operation panel integrated in a compact all-in-one system. The user interfaces of these instruments can sometimes be hard to reach because of installation in a difficult position of the process pipe. Yet, in these cases, the Rhosonics RCU Remote Control Unit would be the perfect solution.
This multifunctional device is connected to the instrument by cable and can be used to monitor measurement results and change settings real-time at a safe and convenient location near the process. Another feature of the RCU is the communication protocol converter. For example, one of the RCU models is equipped with a HART/4...20 mA signal to Modbus RTU signal converter which can be very useful in case a Modbus RTU output is required. Click here to learn more about the RCU models.