Flow weight grader

The weight grader is filled with fish products by an operator into an infeed Z-type conveyor — one product per pocket.
Fish are transported and transferred to an acceleration conveyor.
Each product is then weighed separately in the flow weight conveyor unit.
The weight of each individual fish is compared to the correct exit gate grade and transported along the main conveyor to the corresponding exit gate, where a flap opens automatically to receive the fish into a box.
When boxes at several stations are close to their needed weight, the product is transferred to the exit gate with the lowest possible up-weight compared to the other gates.
Once a station achieves a correct weight for a particular batch, the machinery sends the boxed fish further down the line and the entire process begins again.
The machine requires just one operator stationed at each gate, allowing precise, fast, and continuous weighing of produce.
PERUZA’s Flow Weight Grader is part of an extensive lineup of automated fish and food processing solutions, allowing facilities to achieve consistent results while also increasing operational efficiency.


The PERUZA Flow Weight Grader has been designed for continuous and fast dosing of whole fish into boxes.
The weight grader precisely weighs fish and selects them for boxing, working at an adjustable speed of 60-120 fish per minute.
PERUZA’s Flow Weight Grader can be configured for grading fish into boxes by specific size while also considering their weight. The system is highly adaptable and able to work with a variety of species of whitefish or even whole salmon, representing an effective solution that provides a predictable and easily repeatable sorting and packing process.

Main benefits:

Awards received:

“PERUZA proved to be a reliable and professional partner, and helped us improve our shipment processing speed and internal process automation when adjusting to the rapidly increasing volume of shipments."

- Jānis Grants, CEO OF DPD LATVIA -

Technical information

Technical characteristics:


Whole-round fish

Processing capacity

60-120 fish per minute

Equipment dimension (LxWxH)

13800 x 2340 x 2230 (mm)

Number of operators on the machine


Key features

Adaptable, effectiveness, repeatability

All features & benefits

Extensive module system

Faster production time

Up to 120 products can be processed within a minute with only four operators involved, thanks to the extensive module system.

compact and clever design

Compact size

The unique design allows for the equipment size to be one of the most compact in the market – the machine takes only 6100 x 1750 mm of floorspace! Beyond the dimensions, the thoughtful design allows for highly efficient use of space in smaller factories and various production lines with previously limited capacity.

3D RECOGNITION & weight calculation unit

Reduced giveaway

Precise calculators in our 3D dimension recognition and weight calculation unit reduce the giveaway of the product and increase the line capacity. The final weight range in packaging and current line setup can be adjusted in a smart, easy-to-use interface. 

Adaptable functionality

Fit for various products

The easy-to-use, intuitive user interface allows for the weight range to be adjusted, and this machine can be adapted for various products ranging from fresh or frozen meat and fish to vegetables and fruit.

How it works

Step #1

Arrival on product conveyor

Firstly, the products arrive onto the main product conveyor one by one in 1, 2 or more lanes.

Step #2

Passing through 3D recognition unit

Then the product is passed through 3D dimension recognition and weight calculation unit.

Step #3

Product placement into a tray or box

The program sends a signal to the robot with appropriate gripper to pick up and place the product into a tray or box to reach a set final weight range in packaging that can be adjusted in the user interface.

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