Hydra Multi Head Weigher: A Complete Guide for Bulk Packing

Choosing a bulk weighing system means looking beyond the number of packs a machine can produce. Product consistency, average pack weight, interruptions and the capacity of the rest of the packing line all influence what an investment will deliver.

The Agrimech Hydra multi head weigher is designed for large crop samples. Its published applications include potatoes, onions, animal feeds and aggregates, with packaging compatibility covering boxes, trays, bags, sacks and poly banded nets.

For businesses researching a potato weighing machine, onion weighing machine or automated bulk packing system, this guide explains the specifications, the principle of combination weighing and the practical questions to ask before choosing equipment.

Hydra multi head weigher specifications

Source: Agrimech Hydra product page. Confirm the selected configuration and operating conditions with Agrimech.

How does a multi head weighing system work?

Combination weighing builds a target batch from several smaller portions. Individual weighing heads hold measured quantities, and the controller identifies a suitable combination to discharge together. The emptied heads can then refill for subsequent cycles.

Consider an illustrative target of 25kg. If separate heads contain portions weighing 6.1kg, 6.4kg, 6.2kg and 6.3kg, those four portions total the target. Other cycles may use different combinations.

The advantage is the ability to select between available portions when assembling a batch. A useful combination depends on the quantities held in the heads, so consistent feeding matters alongside the weighing process itself.

This describes the general principle of multihead weighing, rather than a published account of Hydra's control algorithm. The principle is explained in research on multihead weighing and target selection.

What does the rated capacity mean for your packing line?

Using the metric capacity in the specification table, the theoretical mass throughput is:

10 weighments × 25kg × 60 minutes = 15,000kg per hour.

That gives a calculated equivalent of 15 tonnes per hour and 600 weighments per hour. It is a conversion of the published rate, rather than a separate guarantee of sustained production.

To assess practical output, follow the product through the entire line. Can the infeed keep the weigher supplied? Can the packaging equipment accept each discharge? Can closing, conveying and palletising keep pace?

For example, a downstream station handling eight packs per minute would limit finished output even if the weighing stage could work faster. Increasing capacity at one stage only improves overall production when the surrounding equipment can support it.

Record these three figures separately during a trial:

• The weighing rate while the system is running steadily.
• Finished packs produced during a full operating hour.
• Saleable output across a complete shift, including normal interruptions.

The shift figure is particularly useful for production planning. It reflects the time spent changing packaging, replenishing product, cleaning and dealing with stoppages.

Why accurate weighing matters to product giveaway

Product giveaway is the quantity packed above the intended weight. A small average excess can become a substantial quantity across a long production run.

As an illustrative example, assume a business produces 4,000 packs daily, each averaging 40g above its target. The excess product would total:

4,000 × 0.04kg = 160kg per day.

If measured average excess fell to 15g, the same number of packs would contain 60kg of excess product. The difference would be 100kg daily.

These figures demonstrate the calculation; they are not measured Hydra results. Actual improvement should be established through trials with representative products and operating settings.

When assessing any precision weighing machine, ask how the supplier defines accuracy. Is the figure based on individual batches or an average? Which products and target weights were used? What operating speed and feed conditions applied?

Also distinguish instrument performance from the weight of the finished pack. Product remaining in the discharge path, losses during transfer and packaging tare can affect the result. Finished-pack measurements therefore provide a useful check on the complete process.

Product trials for potatoes, onions and other bulk materials

A product trial should reflect the material that will actually arrive on your production line. A carefully selected sample may give a different result from a normal day's supply.

For crop packing, include the range of sizes and conditions your business handles. Observe how consistently product reaches the weighing stage, how it moves through discharge and what happens when the feed rate changes.

For other bulk materials, discuss particle size, bulk density, dust, abrasion and flow behaviour. Product suitability should be assessed for the particular application before specifying a machine.

Useful trial measurements include:

• Average finished-pack weight and weight variation.
• Sustained output with normal packaging and operators.
• Frequency and duration of interruptions.
• Product condition before and after handling.
• Time required for cleaning and product changeovers.

Agree the acceptance criteria before the demonstration. A trial becomes much more useful when both parties know which results will determine suitability.

Integrating automated weighing with bagging and palletising

A successful automated weighing and packing line coordinates product supply, weighing, packaging presentation, discharge and removal.

Start by mapping the existing process. Identify where operators wait for product, where material accumulates and where finished packs slow the line. This helps establish whether weighing is the main constraint or one of several constraints.

Then consider the discharge interface. The receiving container needs to be in position when product is released, and the filled pack needs a clear route away from the filling area. Confirm how the equipment will coordinate these events and respond when the next stage stops.

For a wider line assessment, explore Agrimech's placing systems, stitching equipment and palletising solutions.

Evaluate the combined line against your required finished-pack output. This provides a more useful purchasing basis than comparing isolated machine speeds.

Installation planning for a bulk weighing system

The machine dimensions are only the starting point for a layout. Installation planning should also allow for access, feeding equipment, packaging movement and maintenance.

Check the proposed layout for:

• Headroom around the complete installed arrangement.
• Safe access for operation, inspection and cleaning.
• Routes for incoming product and outgoing packs.
• Space to remove or service components.
• Suitable electrical and compressed-air provision.
• Delivery access, positioning arrangements and floor suitability.

For compressed air, confirm required consumption as well as pressure. An available pressure reading alone does not establish whether the supply can support the machine while other equipment is running.

Ask for a layout drawing showing the complete configuration and interfaces. Reviewing it with the people who operate and maintain the line can reveal practical issues before installation.

Assessing the return on investment

The value of a weighing upgrade depends on the improvements your business can use and measure.

Build the business case around three areas: additional saleable production, changes in product giveaway and changes in labour requirements. Use current production records as the baseline and supplier trials to inform realistic improvement assumptions.

For increased throughput, establish whether there is demand for the extra output. For reduced giveaway, use the measured change in excess weight and a justified product value. For labour, distinguish between time released for other tasks and an actual reduction in cost.

Include installation, training, servicing, consumables and utility costs. Avoid counting the same benefit twice, such as treating additional capacity as revenue when the business has no orders to fill it.

A simple payback calculation is:

Installed investment ÷ annual net benefit = estimated payback period.

Prepare a conservative case as well as an expected case. The comparison shows how sensitive the decision is to production volume, downtime and product value.

Choosing the right agricultural weighing equipment

The right weighing system should match your product, target pack weights, production pattern and future plans.

If you run short seasonal batches, change formats frequently or expect to expand, discuss those requirements at the specification stage. Ask how the proposed configuration will perform on your most common products and on your most challenging product.

Compare options across Agrimech's weighing equipment range. Request a proposal covering the selected machine, necessary ancillary equipment, installation, training and ongoing support.

Clear responsibilities matter during commissioning. Agree who will prepare the site, connect services, set up interfaces and verify performance. Record the handover criteria so your team knows when the line is ready for normal production.

Frequently asked questions

Is a multi head weigher suitable for my crop packing operation?

Suitability depends on the product, pack weight and required output. Provide representative samples and ask for a trial using the intended packaging arrangement. Measure finished-pack weight, sustained production and product condition.

Does a faster weigher always mean a faster packing line?

Overall output depends on the capacity of every connected stage. If filling, closing or palletising is already the constraint, the line may need changes beyond the weighing equipment.

How should I measure potential savings?

Record current pack weights, output, downtime and labour requirements. Compare those figures with trial results and use conservative assumptions when calculating annual benefit.

What information should I provide when requesting a quote?

Share product samples or specifications, target weights, packaging formats, required hourly output, operating hours and a site layout. Include information about existing machinery and available services.

Where can I find the current Hydra specification?

Visit the Hydra product page and ask Agrimech to confirm the proposed configuration in the quotation.

Discuss your weighing and packing requirements

If you are considering a Hydra multi head weigher, start with the results your business needs: consistent pack weights, a defined production rate and dependable flow through the complete packing process.

Contact Agrimech to discuss your product, packaging and throughput requirements, and request a configuration matched to your operation.