9670: Slurry Analyser

The Rhosonics non-nuclear Model 9670 Slurry Analyser offers information about the dissolved solids (TDS), suspended solids (TSS) and density in your chemical liquid or slurry and is designed for a wide range of industries and applications. The model 9670 has a robust design with sensors that are made of highly corrosion and abrasion resistant materials to withstand rough process conditions. The analyser is mostly used for measurement of the solid content in chemical slurries. However, the instrument can also be used to measure multiple other parameters of a liquid or slurry such as the density in g/l, concentration (TDS) in wt% and the temperature.

Features and benefits

Major features and benefits of the Model 9670:

  • Real-time in-line solids and density monitor
  • Wide range of measuring parameters
  • Non-nuclear technology
  • Corrosion and abrasion resistant sensors
  • Easy installation and maintenance free
  • Outputs for process control and alarm signal


Model 9670 can measure the following parameters:

  • Attenuation (solids)

Particles are absorbing ultrasonic energy. Model 9670 measures the loss of energy over a particular distance. Those losses are a value for the amount of solids, expressed in weight percent (wt%) or gram per liter (g/l).

  • Acoustic impedance (density)

The acoustic impedance is the reflection of energy at the interface between the sensor and slurry or liquid.

  • Sound velocity (concentration)

The sound velocity is determined by measuring the time that the ultrasonic signal is traveling over a known distance. This distance is from the sending to the receiving sensor and is equal to the pipe diameter.

  • Pt100 sensor (temperature)

The temperature is measured by a Pt100 probe to compensate for temperature influences.


There are multiple configurations available for the solids meter, the final choice depends on the specific applications of the customer.

The model 9670 can easily be installed in pipe lines by mounting the sensors onto a metal UFTC spool piece or with a flow through wafer. With both installation methods, there will be zero intrusion of the ultrasonic sensors in the process liquid or slurry.

For tank installation, Rhosonics will use another sensor type. This configuration offers a specially designed fixed UTP tank probe and uses reflection technology with one ultrasonic probe instead of two compared to the model 9670. This product is available as the model 9680 slurry analyser.

Performance specifications


Attenuation, sound velocity, acoustic impedance and pt100 temperature measurement

Measuring range:

Various, depends on the application


Solids g/l, Concentration wt%, Density g/l, Temperature in °Celsius


Up to 0.1% of reading, various depending on the application


5,7” Color Touch Screen


Touch Screen Display, Computer

General specifications

Process conditions

Max pressure:

25 bar

Temperature range:

0 °C … 110 °C (32 °F to 230 °F)

Wetted materials:

316L, PEEK

Electrical specifications

Power supply:

24VDC or 100-240VAC 50/60Hz

Communication & Output:

4-20mA outputs (2x), Alarm output (2x), RS485/RS422 using Modbus

Optional: Ethernet, Profibus

Data logging:

USB data logging & fault reporting

Cable entries:

5 pieces of M20x1.5 cable glands for Ø5-9 mm cable

Ambient conditions

Ambient temperature:

-20 °C to +65 °C (-4 °F to 149 °F)


< 95% at 40 °C (noncondensing)

Sensor protection:


Housing dimensions and weight


Weather proof housing (WPF) approx. 6 kg, sensors and cells various weight depending on type

Housing materials:

WPF housing made of coated steel


WPF housing

300 x 300 x 120 (L x W x H in mm)

Process connection:

  • UFTC Spool piece with 3 ports
  • UFTW flow through wafer
  • UWC wafer cell with 3 ports



Nominal pipe size:

1” up to 3” pipes with UFTW

3” up to 16” pipes with UFTC or UWC

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