Lenterra Sensor Systems

Lenterra Flow Sensor Systems

Freeman Technology are the worldwide exclusive distributors of Lenterra products.

Lenterra specialises in sensor instrumentation for in-line, real-time powder flow measurement. For more information on the two systems available, the Lenterra Flow Sensor (LFS) System and the Lenterra Wall Shear Stress (WSS) System, please see below.


Lenterra Flow Sensor (LFS) System

LFS System

The LFS system consists of a Drag Force Flow (DFF) sensor, a Lenterra Optical Interrogator (LOI) and a ruggedised laptop with bespoke software.

The system provides an in-line, real-time assessment of powder flow enabling improvements in process understanding and manufacturing efficiency in various industries.

Lenterra Flow Sensor System Powder Motion Drag Force

How it works

    The DFF sensor consists of a hollow pillar mounted on a stationary base, containing two optical strain gauges, Fibre Bragg Gratings (FBGs). The LOI is connected to the FBGs via a fibre optic cable and continuously monitors the FBG spectra. When the pillar is deflected by flow, one FBG becomes extended and the other one is compressed, leading to a shift in wavelength spectra. A larger deflection results in a greater shift.

    When the probe is immersed in a moving powder or material, the DFF sensor bends under the force of the flow. The magnitude of the deflection is continuously measured and quantifies the drag force in real-time, which is a function of material properties such as size, density, adhesion and strength, allowing operators to assess material properties in-process.


Features

  • In-line, real-time measurement of material properties and temperature
  • Multi-directional sensitivity
  • Chemically resistant construction
  • Fibre optic connectivity

Benefits

  • Robust Process Analytical Technology (PAT)
  • Enhance process understanding
  • Improve product quality and consistency
  • Optimise cycle times
  • Accelerate / simplify scale-up
  • Minimise 'out of specification' material and rework
  • Improve compliance
  • Reduce costs (rework, resample, retesting etc.)


Application Example

High Shear Wet Granulation

High Shear Wet Granulation (HSWG) is widely employed in many industries. Effective management of HSWG processes requires an understanding of granule evolution and the impact of changing properties.

The DFF sensor delivers valuable information to assist formulation and process development, as well as for routine monitoring, control during manufacturing, and scale-up strategy. The data below illustrates how the technology can be used to robustly track a granulation process, enabling the user to monitor granule evolution without disrupting the process.

Drag Force Flow Sensor

Advantages of the Drag Force Flow (DFF) Sensor

Consolidated Granule Impacts Graph Drag Force Flow Sensor in-line PAT Graph
The principal output of the Drag Force Flow sensor for powder mixing applications, including granulation, is the Force Pulse Magnitude (FPM). FPM is the difference between the force at maximum and the preceding minimum. Each FPM, therefore, characterises a passing of one blade under the probe pin. Being a differential measurement, FPM provides a reliable characteristic of the wet mass consistency and densification, since it is independent from possible zero drift in the raw signal.


Other Applications:

For further information, please contact us.



Lenterra Wall Shear Stress (WSS) System

LFS System

The WSS system consists of a RealShear™ sensor, a Lenterra Optical Interrogator (LOI) and a ruggedised laptop with bespoke software.

The system provides an in-line, real-time assessment of liquid flow enabling improvements in process understanding and manufacturing efficiency in various industries.

RealShear Wall Shear Stress Sensor RealShear Wall Shear Stress Sensor

How it works

The RealShear sensor is mounted flush with a pipe, vessel wall or rotor-stator workhead providing a real-time measurement of wall stress.

The sensor consists of a floating element attached to a cantilever beam that deflects in response to shear force as liquid flows across its surface. The cantilever transmits the shear force to two optical strain gauges, or Fibre Bragg Gratings (FBG), mounted internally. When the beam is deflected, one FBG is extended and the other is compressed, leading to a shift in wavelength that quantifies flow force and temperature. A larger deflection results in a greater shift.

Fast, continuous measurement of flow rate, viscosity and multiphase flow characteristics are provided via the LOI.

Features

  • In-line, real-time measurement
  • Bi-directional sensitivity
  • Chemically resistant construction
  • Fibre optic connectivity
  • High measurement rate

Benefits

  • Enhance process understanding
  • Improve product quality and consistency
  • Optimise cycle times
  • Accelerate / simplify scale up
  • Minimise 'out of specification' material and rework
  • Improve compliance
  • Reduce costs (rework, resample, retesting etc.)

High-Shear Mixers

Application Example

High-Shear Mixing

High Shear Mixers (HSMs) are increasingly employed across numerous industries, providing shorter mixing times and radically improving throughput compared with conventional mixing techniques.

The RealShear sensor can be mounted within many different types of process equipment, including rotor-stator HSMs which contain a rotor that rotates in close proximity to a stationary element (a stator). Mix components that pass between these elements experience high shear stress, which is the lateral force exerted by a surface on the material or vice versa. The assessment of viscosity, granularity or, in the case of a food product, qualities such as ‘spreadability’ or ‘mouthfeel’, is important to ensure high quality final products. Despite the close proximity of the rotor and stator, the RealShear can be used to provide inline measurements of wall shear stress to determine when target characteristics have been achieved.

As data is acquired in real-time, it can be used to improve process efficiency and prevent overprocessing – demonstrating its value as an effective PAT tool in the manufacture of emulsions and other liquid substances.

Advantages of RealShear Sensor

For further information, please contact us.



Lenterra Optical Interrogator (LOI)

Optical Sensor Interrogator Offers Fast, High Resolution Interrogation

High-Shear Mixers

Designed for use with Lenterra's in-line, real-time Drag Force Flow (DFF) and RealShear™ Wall Shear Stress (WSS) sensors, Lenterra's Optical Sensor Interrogator (LOI) is a compact, robust, fast measurement unit. The LOI delivers high accuracy, long term stability, streamlined installation, and premium performance.

Using light instead of electricity and glass fibre instead of copper wire, the sensors are nonconductive, electrically and chemically passive, and immune to electromagnetic interference.

Lenterra's fibre optic platform, based on FBG technology has the ability to significantly enhance process performance, quality, productivity and safety in numerous industries.

The LOI is controlled by any standard PC through a USB interface and utilises a fast, low noise Distributed Feedback diode laser with narrow linewidth for full spectrum scanning. Custom software is used to control the interrogator and process and store collected shear stress data.

For further information, please contact us.

Lenterra Optical Sensor Interrogator

Images reproduced with the permission of Lenterra Inc.