Optical Sorting Products

MAF RODA Potato and Onion Optical Sorting

  • Advanced vegetable optical sorting
  • Unique external & internal defect detection
  • Suitable for a wide range of crop
  • Exclusive technology for high accuracy
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French machinery manufacturers, MAF Roda Agrobotic, supply technologically advanced fruit and vegetable sorting machines worldwide. Tong is proud to be the UK’s sole distributor of MAF RODA optical sorting machines, suitable for high quality optical grading of onions, potatoes, garlic, Brussel sprouts and more.


multiple crop

MAF optical sorting machines can be specified for use on a wide range of vegetables including potatoes, onions, Brussel sprouts and more.


consistent results

Optical sorting offers exceptionally accurate and consistent grading results whilst also removing the need for manual sorting of crop.

high throughput

up to 60 TPH

With up to 10 cells per second per lane, and a choice of between 2 and 8 lanes, MAF optical sorters offer high capacity grading of crop.

MAF RODA Potato and Onion Optical Sorting | Tong Engineering


Leading the way in technically advanced vegetable weight grading and optical sorting of a wide variety of fruit and vegetables. From external blemishes to internal defects, a vegetable optical sorting solution from MAF RODA will ensure your crop is processed profitably, with exceptional quality.

Exclusive Internal & External Vegetable Optical Sorting

The unique and intelligent MAF internal and external defect sorting technology really sets MAF RODA Potato and Onion Optical Sorting apart from other potato and onion optical sorting solutions on the market.

Designed to minimise labour requirements whilst increasing capacity and yield, MAF’s ability to grade by weight, shape, diameter, volume, colour, as well as looking at both internal and external flaws offers vegetable producers worlwide with a level of accuracy and crop throughput that is second to none.

The progressive potato and onion optical sorting capabilities of MAF RODA Potato and Onion Optical Sorting, coupled with Tong’s expertise in advanced and gentle handling equipment, ensures that a Tong/MAF solution features optimum feed of crop to the MAF sorter for the highest quality results.



The Globalscan 7 (G7) is MAF’s exclusive LED external potato and onion optical sorting system. It utilises pre-set LED wavelength lighting and HD cameras to allow analysis and grading of crop accordingly. The G7 optical sorting technology uses cutting-edge imagery to detect any blemishes or defects on the crop’s outer surface.

Globalscan is a multi-spectral system with its optical grading principle enhanced with the information provided by a visible spectrum, as well as extracted wavelengths in the infra-red system. Thanks to a dimensional analysis, the G7 will also determine the diameter, length, and shape of the product extremely accurately.

In addition, highly efficient artificial intelligence (AI) algorithms can be used to allow the G7 technology to progressively learn defect specifications for even better categorisation. The G7 camera system rapidly captures multiple images of each crop whilst it is rotated under the camera, enabling extremely accurate and consistent external sorting.



With the ability to grade by weight, shape, diameter, volume, colour, and the option of looking at both internal and external flaws – grading with MAF RODA Potato and Onion Optical Sorting offers the most accurate and precise sorting solution on the market. Capable of grading crop into 16 sizes, 8 colours and 4 different external qualities! 100% of the crop surface is analysed using dual sensor cameras so you can be sure your crop is graded to the best standard.

Onion optical sorting | Tong Engineering


The whole grading process with MAF from weight to potato and onion optical sorting is completely automatic and minimises the need for manual labour. In addition to this, the intelligence in-built within MAF machines mean that they can self-adjust according to the size of the crop, ensuring maximum capacity is reached. Sorting the crop to such precise specifications also means that waste is reduced and more crop is saleable.


MAF RODA potato and onion optical sorting machines optically sort crop using MAF designed and patented software known as IDD8 (Internal Defect Detection). IDD8 is specifically designed to identify internal defects that would not be noticeable by eyesight. It is paired with MAF’s Globalscan technology to ensure that all defects, both external and internal are picked up and separated. Most crops are affected by internal defects, these defects called internal browning or water core are usually identified as internal rot. The quality of detection can be adjusted to notice the smallest of imperfections within the crop using the user-friendly interface; sorting could not be made any easier or accurate.

Tong Onion Line-55


The programme interface for Globalscan, IDD8, is connected to MAF Ophea software, which is exceptionally easy to use and can be seamlessly integrated with your own ERP system for detailed data management, allowing customers to get the best out of MAF equipment.

For added usability, the MAF sorting machine itself automatically washes, lubricates, and self-services, reducing the need for maintenance and ensuring that equipment runs at maximum performance at all times.


MAF RODA potato weight grading machinery removes the risk of errors present when manually sorting, and offers a speedy grading process with it’s ability to weigh and grade crop in a few seconds. The crop is individually carried through the line on electronic cells which precisely weigh the crop, and then sizes and grades automatically.


As with all of Tong’s machines, quality and care for your valuable produce is amongst our top priorities. With the gentlest handling of crop in mind , MAF RODA optical sorting machines see crop exiting the grader on foam covered chutes in order to ensure delicate transfer of crop to avoid any bruising, scraping or damage.

Advanced Onion Optical Sorting

The MAF Pomone efficiently and accurately sorts onions using both G7 and IDD8. The cutting-edge technology of G7 can identify blemishes on both white and red onions making it a unique, unrivalled attribute of the MAF Pomone. The IDD8 detection system effectively identifies internal defects within the onions including accurate detection of translucent layers, base rot, neck rot, fusarium rotten core and other internal issues. This coupled with the G7 and weight grading system incorporated into the Pomone ensures extremely accurate sizing and quality sorting.

MAF Potato Sorting Optical

Precise Potato
Optical Sorting

The MAF Oneway offers an advanced weight and optical grading solution for potatoes. Crop is scanned using Globalscan 7 resulting in high quality sorting of crop by diameter, colour and shape. Operating at high speeds for weight sizing, the MAF potato sorter is capable of sorting 600 cups a minute per lane.


Tong MAF onion optical sorting
MAF onion optical weight sorting line (12)
MAF RODA Potato and Onion Optical Sorting | Tong
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