Parsum IPP 70-SE

An intrinsically safe in-line particle sizing probe for real-time measurement

Compact, lightweight and easy to install, the Parsum IPP-70-SE is an intrinsically safe probe for 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, in gas or dust zoned hazardous environments.

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Features and benefits

The intrinsically safe Parsum IPP 70-SE is 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    
  • Certified at ATEX 100

How it works

The Parsum IPP 70-SE 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. The probe itself can be used in zones 0, 1, and 2, 20, 21 and 22 with the corresponding electronics casing rated for use in zone 1 and 21.

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-SE 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

Particle velocity

Measurement range 0,01 – 50m/s


Measurement principle Spatial Filter Velocimetry
Light source 670nm
Laser safety Class 1

Operating environment

Temperature 10°C – 60°C
Humidity 35% - 80% non-condensing
Enclosure rating IP 65


D23 Inline eductor (4mm)

In-line disperser for fine particle processes.

The D23 disperser dilutes and disperses material drawn from the process, simultaneously directing it towards the measurement zone of the IPP 70 probe. It ensures robust and accurate sizing for particles with a Dv50 in the range 50 to 1200 µm, making it especially useful for direct measurement within fluidized beds.

D11 Inline eductor (8mm)

In-line dispersion for coarse particles and high solids loadings.

The D11 sample disperser dilutes and disperses material drawn from the process, simultaneously directing it towards the measurement zone. It ensures robust and accurate sizing for coarse particles in processes where solids loadings are high, such as granulation.

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

Measuring at rates of up to 10,000 particles per second, the IPP 70 continuously tracks a large variety of PSD parameters making it ideal for endpoint detection, process control, process optimization and real time quality control for a range of applications including: 

  • Grinding / dosing
  • Agglomeration
  • Spraying
  • Fluidized bed processes
  • Transportation and filling
  • Wet and dry granulation
  • Seiving
  • Spray drying
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.

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