Should I try an optical color sorter for ergot in my wheat?

The decision you face in the bin or at the scale

You have a wheat lot with visible ergot or a buyer worried about it. Mechanical cleaning (screens and air) removes a lot of debris. Some ergot bodies can be close in size and weight to sound kernels, making them difficult to separate with screens and air alone. That’s when an optical color sorter can be worth evaluating. This article explains what the sorter does, how it fits into the cleaning chain, and what you should learn from a representative sample test before you decide to buy.

How optical color sorting actually works

A color sorter looks at each piece of grain with cameras or sensors and removes items that differ in color, shape or reflectance. When the machine flags a kernel or foreign object, compressed air ejects it into the reject stream while the rest continues as retained grain. That optical observation plus pneumatic rejection is the mechanism that targets ergot-sized pieces that still pass through mechanical cleaners.

Why optical sorting can help after mechanical cleaning

Some ergot bodies are close in size and weight to sound kernels. Screens and air systems rely mostly on size and weight. That means mechanical cleaners can leave a hard-to-separate fraction. Optical sorting targets that fraction by visual differences, making it an option when mechanical methods alone can’t get the lot saleable.

The practical tradeoff: cleaner grain vs. good-grain loss

Optical sorting can reduce the visible ergot in the retained wheat. But getting the last traces out requires tighter settings. Tighter settings eject more pieces and so increase the amount of good grain that ends up in the reject stream. The Dvorak Farm Services case describes this balance: the operator reduced ergot enough to sell some lots but did not remove every piece, and they noted that tighter separation would have meant rejecting more sound grain.

Where pre-cleaning and machine setup matter

Before optical sorting, remove dust, small debris and chaff. The Dvorak operator emphasized pre-cleaning as an important step. The Metra manual also ties feed preparation, clean optical windows, sensitivity settings and steady air supply to good sorting performance. Feed preparation and optical cleanliness affect how well the sorter can see and reject ergot without producing extra rejects.

What Metra’s sorters add to the workflow

Metra offers optical color sorters that can be configured for different grains and customer needs. The product pages describe pre-programming options, tuning and operator training. Use those capabilities to test your material and the settings that matter for your lot. Discuss how the sorter was tuned in the test so you can relate the result back to your buyer requirements and desired retained quality.

A short historical example

In a historical Dvorak Farm Services interview, the operator reported using a Metra color sorter on a wheat lot rejected for ergot. They described cleaning fees, discounts and how the color sorter reduced ergot to a saleable condition for some buyers while accepting that not all ergot was removed. This example shows the tradeoff and the role of pre-cleaning in a real operation, but it is an operator account and not a lab report.

A checklist to evaluate a representative sample with Metra

Ask these practical questions when you arrange a sample test or demonstration. 1) Is the sample truly representative of the lot (same incoming mix, dockage and kernels)? 2) What did the retained grain look like after sorting and what residual contamination remained? 3) How much good grain was routed to the reject stream in that test? 4) Which machine settings, feed rate and air conditions were used for the test? 5) How does the tested retained grain compare to the buyer’s requirements? 6) Will you see the separation result and the reject-retained split before deciding? These answers let you judge if the sorter can reach the right balance for your lot and buyers.

How to use the test information when you decide

Compare three things from the test: remaining contamination in the retained grain, the quantity of good grain lost to rejects, and the tested operating conditions. Higher removal of ergot usually means higher good-grain loss. Use the test evidence to negotiate buyer terms, decide on a final setting, or weigh whether to accept the reject stream loss. Remember buyer acceptance and regulatory thresholds are separate facts to check with your purchaser or a lab.

Next step: arrange a representative sample test or a warehouse demo

If you want to see how an optical sorter performs on your material, contact Metra to discuss testing a representative grain sample or arranging a warehouse demonstration before buying. Use the checklist above when you contact them so you get the test details you need to make a decision.

Discuss a grain sample test

Contact Metra at https://metragraincleaner.com/ or call +1 701 515-0488 to discuss testing a representative grain sample or arranging a warehouse demonstration. You can also view the 6AS-680 product page at https://metragraincleaner.com/product/6as-680/ to prepare questions for the test.

Contact Metra: sample testing and demonstrations

See how a Metra optical color sorter handles your material before you buy. Contact Metra to discuss testing a representative grain sample or arranging a warehouse demonstration. Call +1 701 515-0488 or contact Metra at https://metragraincleaner.com/contact-us/. Explore the optical sorter lineup at https://metragraincleaner.com/product_category/optical-color-sorters/. Arrange sample shipping or your visit with Metra first.