SDM: Slurry Density Meter

Rhosonics introduces the latest generation non-nuclear density meter, the SDM Slurry Density Meter. This instrument is suitable for real-time density measurement in all kinds of slurries. The product uses sustainable ultrasonic technology and is specifically designed for dredging and mineral processing applications.

Dredging and mining companies are increasingly looking for non-nuclear measuring instruments. 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 uses 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 easy and 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).

Download the SDM Brochure: English - Portuguese - Spanish - French

Download the SDM Case Study: Dredging - Mining - Comparison test - Washing Plant

Features and benefits

  • Non-Nuclear density meter, ultrasonic 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

Performance specifications

Method:

Ultrasonic Spectral Power /

Acoustic impedance

Density Range:

700 … 3.000 g/l

Resolution:

0.2 g/l

Readings:

S.G., Density g/l

Accuracy:

Up to 0.005 S.G … +/- 0.5%

Decay time:

1 to 99 s (adjustable)

Display:

Monochrome display with RGB backlight, visible through glass cover.

Operation:

Push-buttons, HART, Computer

Optional: RCU Remote Control Unit

General specifications

Process conditions

Pressure:

1 … 16 bar

Temperature:

0 °C … 110 °C (32 °F … 230 °F)

Wetted materials:

Ceramics and Duplex Stainless steel 1.4462

Electrical specifications

Power supply:

18 … 32 VDC, 8 Watt

Optional: Power supply/converter for 90 … 240 VAC

Output:

4 … 20 mA / HART

Communication:

2-way through HART protocol

Optional: RCU unit as converter to Modbus RTU or Profibus DP

Data logging & fault reporting:

Internal memory,

via USB memory stick

Cable entries:

3X M16X1.5, cable OD Ø 3-10 mm

Ambient conditions

Ambient temperature:

-20 °C … +65 °C (-4 °F … 149 °F)

Humidity:

< 95% at 40 °C (noncondensing)

Protection:

IP68, NEMA 6P

Vibration:

Resistant to moderate / high vibration of pumps

Dimensions and weights

Weight:

Approx. 6.4 – 6.8 kg

Housing materials:

Coated stainless steel

Housing dimensions:

218–402* (L) x 208 (W) x 170 mm (H)

* Various depths, depending on probe type

Process connection:

UFTP Spool (sensor depth: 146 mm)

Weldolet (sensor depth: 34 or 52mm)

Wafer (sensor depth: 146 or 200 mm)

Standards:

DIN/ANSI/JIS (others on request)

Nominal pipe size:

Up to 60”

Digital communication via HART

The SDM is a HART certified device. It can communicate digitally with other HART equipment using the analogue 4-20 mA output.

The HART protocol enables remote access and control e.g:

  • Calibration
  • Variable readout
  • Variable ranging
  • Etc.

For more information on the Rhosonics HART implementation see the Rhosonics Field Device Specification (FDS). Click here to open the FDS document. Also, if you want to learn more about HART technology in general, then please click here.

Two Communication Channels

RCU Remote Control Unit / Communication Protocol Converter

The newest Rhosonics instruments, such as the SDM, are supplied with 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, for example because of installation in a difficult position of the process pipe. Yet, in these cases, the Rhosonics RCU Remote Control Unit will 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. The HART/4...20 mA signal can also be converted to a digital Profibus DP signal. Click here to learn more about the RCU models.

SDM WT

Rhosonics introduces the Slurry Density Meter WT (SDM WT). This robust ultrasonic measuring instrument shows the density value in wt% solids with an accuracy up to 0.005 wt%. The SDM WT can measure the density of challenging water-based slurries in industries like dredging and mineral processing. For many years, nuclear devices were the only option. Nowadays the non-nuclear SDM WT is used to replace these radiation sources. Rhosonics employs the field proven ultrasonic technology for density measurement. The Rhosonics Slurry Density Meter has its sensor, analyzer, cable and software integrated in just one system. The density meter is compact and lightweight. With the SDM WT, we can offer the second generation non-nuclear density meter to customers who were demanding wt% solids as measurement value.

Click here to learn more about the SDM WT.

Performance specifications:

Method:

Ultrasonic Spectral Power /

Acoustic impedance

Density Range:

0...80 wt%

Resolution:

0.02 wt%

Readings:

Density in wt% solids

Accuracy:

Up to 0.005 wt% … +/- 0.1% of reading

Decay time:

1 to 99 s (adjustable)

Display:

Monochrome display with RGB backlight, visible through glass cover.

Operation:

Push-buttons, HART, Computer

Optional: RCU Remote Control Unit

The general specifications of the SDM WT are the same as the SDM (see above).

Download the SDM WT Brochure: English

Contact us for more information »