Parsum IPP 70-S

A robust inline particle sizing probe for real-time measurement

Compact, lightweight and easy to install, the Parsum IPP-70-S probe delivers in situ, real-time size and velocity measurements for solid particles up to 6000 µm in size. Dustproof and waterproof, and requiring no sampling or calibration, it provides continuous process monitoring at high and fluctuating solids loadings, even for abrasive, greasy or sticky particles.

Download brochure
Request a quote Request a demo Contact sales

Features and benefits

Parsum IPP 70-S is the standard instrument option. Used in the chemical, food and pharmaceutical industries for endpoint detection, process control/optimization and real-time QC, it is applied in unit operations such as grinding, agglomeration, granulation, sieving and spray drying.    

  • Lightweight and easy to install for rapid integration into new and existing processing plant.    
  • Wide dynamic range for particles from 50 - 6000µm travelling at up to 50m/s.    
  • Reproducible measurement at high solids loadings even with irregularly moving particles - ideal for fluidized bed monitoring.    
  • Real-time measurement and feedback via comprehensive, customizable software.    
  • No sampling or calibration required.    
  • Range of accessories enables application for abrasive, greasy, sticky and adherent particles.

How it works

The Parsum IPP 70-S probe uses the well-established measurement principle of spatial filter velocimetry. No calibration or sampling is required and there is no assumption that the particles are spherical.

Spatial filter velocimetry is a number-based, chord length sizing method that collects data for individual particles to develop a particle size distribution.


Particles falling through a laser beam cast a shadow, interrupting the flow of light to a linear detector array made up of optical fibers. Particle velocity is calculated from the sequential interruption of linearly neighboring fiber elements of the spatial filter detector.

Particle size is determined using a secondary signal, the pulse signal, which is a measure of the length of time for which the particle blocks a single optical fiber.

Measuring a large number of particles generates statistically valid results from which various size parameters and volume-based distributions are derived, depending on the needs of the user.

The Parsum IPP 70-S is installed directly into the line or vessel. Although no sample preparation is required, an internal compressed air supply can be used to disperse agglomerates, to keep the flow channel and optics clear of adherent material and to enable measurement at high solids loadings and temperatures.

Information is transferred from the measurement zone to the electronic housing of the probe via fiber optic cable increasing instrument robustness. These data can then be transferred to the control room or indeed into an existing control system for processing monitoring and control. Because the instrument provides a measure of concentration in the sensing volume, changes in flow/throughput can be estimated, using an appropriate correlation.


Particle size

Measurement range 50-6000µm
Measurement principle Spatial Filter Velocimetry

Particle Velocity

Measurement range 0,01 – 50m/s
Measurement principle Spatial Filter Velocimetry


Light source 670nm
Laser safety Class 1

Operating Environment

Temperature range 10°C -100°C
Humidity 35% - 80% non-condensing
Enclosure rating IP 65


D12 inline sample disperser

Inline dispersion for coarse particles and high solids loadings.

The D12 sample disperser samples, dilutes and disperses material from a process, simultaneously presenting it for accurate particle size distribution and velocity measurement using the Parsum inline measurement probes. It ensures robust and accurate sizing for coarse particles in processes where solids loadings are high, such as within granulation systems.

D24 inline sample disperser

Inline disperser for fine particle processes

The D24 disperser dilutes and disperses material drawn from the process, simultaneously directing it towards the measurement zone of the Parsum probe. It ensures robust and accurate sizing for particles with a Dv50 in the range 50 µm to 1.2mm, making it especially useful for direct measurement within fluidized beds.

At-line measurement station

At-line particle sizing for process applications.

Used in combination with Parsum IPP70-S or IPP70-SE probes, the at-line measurement station enables fast, efficient particle sizing of process samples in the laboratory or on the plant.

4 – 20 mA Interface board (8 channels)

Efficient data transfer from Parsum probe to centralized control system.

Parsum’s optional 4-20 mA interface board streamlines the transfer of particle size data from the probe to a centralized control system, for automation or data display. Eight channels allow interfacing with four probes, each installed as far as 100 m away from the analyzer PC.


Protect your investment and ensure optimized performance at all times with Malvern Panalytical's service plans.

When you purchase a Malvern Panalytical product we understand that this is just the first stage of a working relationship that will last for the lifetime of the instrument. Depending on your needs, Malvern Panalytical will provide the support for your business.

Help Desk


  • User training events

Software downloads

Malvern Panalytical's service options- choose the right plan for you:

Malvern Panalytical Platinum Plan

For laboratories where maximizing instrument up-time is critical to its daily performance. Our highest level of response and the 'all inclusive' price plan takes care of those unexpected repair bills should the unfortunate occur.

Malvern Panalytical Gold Plan

Enhance your laboratory productivity by maintaining instrument efficiency. Still receive that priority response, combined with specialist technical and software support, we'll keep your instrument performance on track to deliver.

Malvern Panalytical Bronze Visit

For laboratories looking to optimize instrument performance, regular preventative maintenance is essential.

Platinum PlanGold PlanBronze Visit
Annual PM/PV Test
Telephone / Email Support
Priority Response
Emergency Breakdown visits*
Parts Included
Technical & Software Support
IQ/OQ (Pharma)***

*including labour & travel costs ***available at an additional cost

Key applications

Examples of applications:

  • Continually determine the layer thickness and the agglomerate fraction in pharmaceutical fluidizedbed pellet coating processes.
  • Detect screen breakage in milling processes for the production of cellulose fibers by identifying the presence of single large particles. 
  • Track progress and determine the granulation end point in high-shear mixing processes, in order to enable faster process scale-up. 
  • Monitor fluidized bed granulation to guarantee batch- to-batch consistency. 
  • Apply as a PAT system for the development and optimization of fluidized bed processes. 
  • Continuous particle size measurement within washing powder granulation processes, enabling a reduction of the rework volume in the grinding / screening loop. 
  • Monitor the grain size distribution during the grinding of materials such as coffee, plastics and silicon, enabling adjustment the milling gap and detection of wear within roller mills. 
  • Measure the particle size underneath a three-deck screening machine to control the amount of mineral material fed into the process and avoid overflow or spillage. 
  • Monitor the particle size within continuous fluid bed dryers in order to allow control of the material feed and the height of bed. 
  • Monitor material segregation or contamination during silo discharge.
In situ, real-time size and velocity.

In situ, real-time size and velocity.

Robust, dustproof and waterproof probes. Cable-free continuous process monitoring. Optimize and control your processes for improved QC.

Request a quote Request a demo Contact sales