9680: Slurry Analyser

Model 9680 offers real-time information about multiple parameters of liquids or slurries. Only one sensor can measure the dissolved solids (TDS), suspended solids (TSS) and density at the same time by reflection technology. Additionally, the sensor can withstand rough conditions of chemicals and mineral slurries thanks to the corrosion and abrasion resistant sensor materials.

In the process, model 9680 can be installed in a tank or in a pipe with a small diameter. For bigger pipe diameters it is required to use a different analyser, model 9670. This analyser has two sensors for transmissive measurement offering the same measurement parameters.

Features and benefits

Major features and benefits of the Model 9680:

  • Real-time solids and density monitoring
  • One hybrid sensor for a wide range of measuring parameters
  • Non-nuclear monitoring in a tank or pipe
  • Corrosion and abrasion resistant sensor
  • Easy installation and maintenance free
  • Outputs for process control and alarm signal


  • Attenuation (solids)

Particles are absorbing ultrasonic energy. Model 9680 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 particular distance is from the UTP tank sensor to the reflector and back or with the UMCS sensor in a spool pipe piece with reflectance on the other side of the pipe piece.

  • Pt100 sensor (temperature)

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


Multiple installation methods are available for the Model 9680. The final choice depends on the desired place of installation in the process.

Tank installation is done through an UTP tank sensor or UHP insertion probe. The UTP probe can be used mounted on top of a tank or in an open channel. For side-mounted installation an UHP probe will be used.

Pipe installation is done through a metal pipe piece (UFTC spool) or with a PEEK wafer (UFTW). Both methods use one sensor that measures the sound velocity after reflection at the pipe wall. For pipes with a bigger diameter, Model 9670 is preferred. This configuration has the same pipe installation methods, but employs two sensors instead of one and is not suitable for tanks.

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

Others on request

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:

  • UTP tank probe
  • UHP tank insertion probe
  • UFTW flow through wafer piece
  • UFTC spool pipe piece (UMCS)



Nominal pipe size:

1” up to 3” pipes with UFTW

UFTC pipe sizes on request

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