Clamp-On multi-frequency ultrasonic systems


Complete system for ultrasonic continuous casting comprising sontrol computer and software generator transducer wave guide and clamp-on sonotrode. Large tube from the standard non-ultrasonic machine. MPI now offers the industry’s most advanced ultrasonic technology for in-line liquid processing applications. Our patented MMM (Multifrequency, Multimode, Modulated) ultrasonic generators stimulate highly-efficient wideband (sonic to megahertz) acoustic energy in reactor and other parts of almost any shape.




Features of MMM ultrasonic power supplies

Ultrasonic generator transducers wave-guides and clamp-on sonotrodes fit to standard pipes tubes and reactor vessels to drive high-power vibrations

  • Fully programmable power and modulation technology
  • Power adjust 0% to 100%
  • Standard power modules in 300 watts, 600 watts, 1200 watts, and up to 20 kW on request
  • Variable pulse-width modulation period (10 ms to 1,000 ms)
  • Variable pulse-width modulation ratio (0% to 100%)
  • MMM special modulation settings (fast sweeping, sweeping, & tracking)
  • Adjustable center frequency (large range)
  • Programmable features allow greater processing flexibility with all kinds of fluids


Wall thickness considerations:

Ultrasonic cleaning in pressurized liquid CO2 - MMM ultrasonics acting through clamp-on sonotrodes excite the pressure vessel.

Although MMM technology will drive tubes, pipes and reactors of almost any wall thickness (e.g. 1mm to 30mm) there are tradeoffs that should be considered. In normal applications with pipe diameters of 25 mm (1") to 100mm (4"), MMM technology delivers maximum amplitude and best multi-frequency harmonic modes with a wall thickness between 1mm and 2.5mm.


Applications where the wall thickness is greater than 2.5mm may still be driven with good results but more power will be required to drive the system with lower amplitudes and reduced excitation of multi-frequency harmonic modes.

A glass flask becomes a sonochemical reactor simply by the addition of the MPI clamp-on ultrasonic system

Tube material considerations:


MMM Pipe-Clamps are normally used on metal objects, particularly stainless steel (tubes, tooling, pressure vessels). Other rigid materials can also be suitable, notably glass, so test-tubes and glass flasks can also be conveniently converted into sonochemical reactors.


Tube diameter considerations:


MMM Pipe-Clamps are suitable for almost any size of tube. We will design the clamp dimensions to fit your pipe diameter. Larger pipes may require modified designs to allow mounting of multiple converters.

Special sonotrode for ultrasonic continuous casting

Tube length considerations:


MMM generator technology also allows us to treat any length of pipe by fitting clamps at intervals along it, driven by one or more MMM generators. The length of pipe that can be effectively activated by one clamp is dependent on many factors and must be tested for each application. The important variables are:


  • Pipe diameter
  • Pipe wall thickness
  • Whether the pipe is free-standing pipe segment or fixed to other pipes or equipment
  • Viscosity and volume of material undergoing treatment


Some examples of applications using relatively long pipe sections with widely-spaced clamps are:


  • Extended atomizing or powder manufacturing
  • Extended treatment time for liquids flowing through a pipe
  • Friction and pressure reduction along a whole length of pipe.
  • Continuous cleaning of pipes (anti-fouling or anti-film) e.g. heat exchangers and pipework for dairy products such as milk or yogurt


Some examples of applications which benefit from the more intense ultrasonic energy (high ultrasonic power density) provided by closely-spaced clamps are:


  • Sonochemical treatments
  • Ultrasonic Cleaning
  • Very high volume atomizing or powder production

MMM ultrasonics applied to plastic extruder production machine

High Temperature Environments:


Another key advantage of MMM generator technology is its ability to drive variable length wave-guides. When driving pipes containing materials at high temperature extended wave guides allow us to distance the converter from the source of heat, helping to protect its heat-sensitive piezo-electric elements.


Standard wave-guides are 100mm to 200mm in length. Extended guides typically range from 1 to 3 meters. Water cooling jackets are also available to fit around the extended guide, further reducing the risk of damaging the transducer.