Automatic Online Checkweigher for Packaged Food Production Lines

In modern food production, accurate weight control is no longer just a final inspection step. It is an important part of production efficiency, product consistency and quality management.

For packaged foods such as snack pouches, bakery products, ready meals, nuts, seafood and other retail packs, manual sampling can miss individual underweight or overweight products.

An automatic online checkweigher provides continuous dynamic weight inspection while products are moving through the production line.

Fanchi-tech's FA-CW Series Dynamic Checkweighers are designed for this purpose, allowing manufacturers to check product weight in motion, automatically identify products outside preset limits and reject non-conforming products without stopping the production line.

 

 

Fanchi-tech online checkweighers installed on a production floor for continuous weight inspection.

---

Why Use an Online Checkweigher in Food Packaging?

Food packaging lines operate continuously. Even a small weight deviation repeated hundreds or thousands of times can result in product giveaway, customer complaints or non-compliant packages.

An online checkweigher measures every product automatically as it passes through the weighing conveyor.

The system can identify:

• Underweight products
• Overweight products
• Missing products
• Weight deviations
• Inconsistent filling or packaging

Instead of manually removing products for weighing, manufacturers can perform 100% inline weight inspection while keeping the conveyor running.

This is particularly useful for high-volume packaged food production.

---

Fanchi-tech Automatic Online Checkweigher

The machine shown in the photograph reflects the type of compact stainless-steel conveyor checkweigher used for inline product inspection.

Fanchi-tech's FA-CW Series is designed around a modular weighing and conveying system with a touchscreen control interface and configurable conveyor dimensions. The manufacturer lists applications ranging from small lightweight sachets to heavier boxes.

Key features include:

Dynamic weighing

Products are weighed while moving instead of being stopped for manual measurement.

Automatic rejection

Products outside the preset weight tolerance can be automatically rejected.

Fast product changeover

The system can store up to 100 product programs, helping operators switch between different packaged products efficiently.

Stable dynamic weight tracking

The system uses dynamic weight tracking and automatic compensation technology to improve weighing stability during continuous production.

304 stainless steel construction

The FA-CW Series uses stainless steel 304 construction, making it suitable for demanding industrial and food-processing environments.

Data management

Fanchi-tech specifies USB/Ethernet data logging and reporting functions for production records and quality management applications.

---

What Products Can Be Inspected?

The key advantage of an online checkweigher is flexibility.

For the machine configuration shown in the image, the most relevant applications are individual packaged products that can travel stably on a conveyor belt.

1. Snack Pouches

Examples include:

• Potato chips
• Nuts
• Seeds
• Dried fruit
• Snack mixes

An online checkweigher can verify whether each sealed pouch reaches its target weight before entering the next packaging or distribution stage.

2. Bakery Products

Applications can include:

• Bread packages
• Cookies
• Cakes
• Pastries
• Packaged bakery snacks

Weight inspection helps identify filling or packaging variations and provides better consistency across individual packages.

3. Ready Meals

For tray-packed or pouch-packed ready meals, an online checkweigher can verify the finished package weight after filling and sealing.

This is particularly useful when recipes contain multiple ingredients and the final package must meet a defined declared weight.

4. Seafood and Meat Packages

Fanchi-tech lists seafood and meat & poultry processing among the applications of the FA-CW Series.

For these applications, the weighing conveyor and machine configuration can be selected according to product weight, package dimensions and production environment.

5. Pharmaceutical and Cosmetic Packages

The same dynamic weighing principle can also be applied to selected pharmaceutical and cosmetic packages where accurate package weight is part of quality control.

---

How Does an Automatic Online Checkweigher Work?

The process is straightforward:

Product Infeed

The packaged product enters the checkweigher from the upstream conveyor.

Product Detection

Sensors detect the product and synchronize its movement with the weighing process.

Dynamic Weighing

The product moves across the weighing conveyor while the load cell measures its weight.

Fanchi-tech's FA-CW Series uses an HBM high-accuracy load cell and dynamic weight tracking technology.

Weight Evaluation

The measured value is compared with the preset target weight and tolerance range.

Automatic Reject

Products that fall outside the acceptable range can be automatically removed from the production flow.

Data Recording

Production information can be recorded and transferred through the available data interfaces for quality and production management.

---

FA-CW Series: One Platform for Different Product Weights

One reason the FA-CW Series is suitable for different production lines is the availability of multiple configurations.

According to Fanchi-tech's published specifications:

*Maximum listed speed is model-dependent and application-dependent. Actual performance depends on product characteristics, package dimensions and line configuration.

This gives buyers a clearer way to choose a machine based on product weight, package size and required throughput, rather than simply searching for a generic checkweigher.

---

Why Is Dynamic Weighing Better Than Manual Sampling?

For low-volume production, manual weighing may be acceptable.

For automated food packaging lines, however, manual sampling creates several limitations.

The biggest advantage is not simply speed.

It is the ability to integrate weight verification directly into the production process.

---

Integrating a Checkweigher into an Existing Production Line

The photo shows an important characteristic of Fanchi-tech's solution: the machine can be installed as part of a larger production system rather than operating as an isolated weighing station.

A typical line can be configured as:

Packaging Machine → Conveyor → Checkweigher → Reject System → Metal Detector / X-ray → Packing & Cartoning

Or, depending on the customer's process:

Filling → Sealing → Checkweighing → Metal Detection → Final Packing

Fanchi-tech's broader product portfolio includes metal detectors, checkweighers, X-ray inspection systems and combination inspection systems, allowing multiple inspection functions to be integrated into a production line.

---

How to Choose the Right Online Checkweigher

Before selecting a machine, buyers should provide the supplier with:

Product weight

For example:

100 g, 500 g, 1 kg, 2 kg or 5 kg.

Package dimensions

Length × width × height.

Package type

Pouch, tray, box, carton, bottle or other format.

Production speed

For example:

60 pcs/min, 100 pcs/min or 150 pcs/min.

Weight tolerance

The required acceptable weight range.

Conveyor height

This determines how the checkweigher will connect to the existing production line.

Production environment

For example:

Food processing, bakery, seafood, meat processing, pharmaceutical or cosmetics.

With this information, Fanchi-tech can recommend the appropriate conveyor dimensions and weighing configuration.

---

What Makes Fanchi-tech Different?

Fanchi-tech focuses on industrial inspection and weighing solutions for production lines, with product categories including metal detectors, checkweighers, X-ray inspection systems and combination systems.

The company's current website also presents the FA-CW Dynamic Checkweigher as a core product and describes its applications across food and packaging industries.

For customers, this means the discussion can go beyond buying a standalone machine.

Fanchi-tech can help configure the machine according to:

Product → Package → Weight Range → Conveyor → Speed → Reject Method → Production Line

That approach is especially useful for OEMs, food manufacturers and packaging-line integrators.

---

Request an Automatic Online Checkweigher Solution

Are you looking for an automatic online checkweigher for packaged food?

Send us the following information:

1. Product photo
2. Product weight range
3. Package dimensions
4. Required production speed
5. Existing conveyor height

Fanchi-tech can recommend a suitable dynamic checkweighing configuration based on your production requirements.

Contact Fanchi-tech

Shanghai Fanchi-tech Machinery Co., Ltd.

Contact: Kerry
Email: kerry@fanchitech.net
Mobile / WhatsApp: +86 13917555254

Website: https://fanchitech.net/
Website: https://www.fanchitechnology.com/

YouTube: https://youtube.com/@fanchitech3323

---

FAQ

What is an online checkweigher?

An online checkweigher is an automatic dynamic weighing machine that checks products while they move through a production line and can automatically reject products outside preset weight limits.

What products can an automatic checkweigher inspect?

Applications include packaged food, bakery products, seafood, meat and poultry, nuts, vegetables, sachets, ready meals and selected pharmaceutical and cosmetic products.

What is the weighing range of the Fanchi-tech FA-CW Series?

The published FA-CW Series specifications range from 3 g to 10 kg, depending on the model.

Can the checkweigher automatically reject underweight products?

Yes. The system is designed to identify products above or below the preset weight limits and perform automatic rejection.

Can the checkweigher be integrated into an existing production line?

Yes. Conveyor dimensions and line height can be configured according to production-line requirements. Fanchi-tech lists multiple conveyor and weighing-platform configurations for the FA-CW Series.

How accurate is the machine?

Accuracy depends on the selected model and application. The published FA-CW Series specifications list accuracy from ±0.1 g to ±1 g across the available models. Actual performance should be evaluated using the customer's product and production conditions