Choosing the right checkweigher
A dynamic checkweigher is an inline scale that grades every pack as it moves down the line, accepts the in-spec ones, and signals or rejects everything outside your weight band. The right model depends on three things: the heaviest pack you need to weigh, how many packs per minute you run, and whether you also need to sort by class or screen for metal.
Start with capacity. The CW-100G family handles tea bags, sachets and tablets up to 500 g. The CW-600G, CW-1.2K, CW-3K and CW-6K cover boxed snacks, bagged food and detergents up to 6 kg. The CW-15K through CW-60K range covers bulk packaging, agri-products and feed, and the CW-2.5T handles palletised loads up to 2.5 tonnes.
Inline check vs weight sorting
An inline checkweigher uses a single accept/reject decision: under-weight, on-target, or over-weight. That is exactly what you want for fill-control on a packing line, where any out-of-spec pack should be removed and re-worked.
A weight sorter, like the CW-1.2K Sorting and CW-6K Sorting, splits product into 5 to 7 weight grades on the fly. It is the right tool for portioning poultry, produce, meat trays or pre-pack snacks where each class lane is sold at a different price.
Checkweigher and metal detector combinations
For food, pharma and dairy lines that need a single inspection point, the CW-1.2K MD, CW-3K MD and CW-6K MD pair a checkweigher with a metal detector on the same conveyor. Packs are weighed and screened for ferrous, non-ferrous and stainless contaminants in one pass, and the controller can reject for either fault.
If you only need contamination control, the MD Series II is a standalone metal detector with a self-learning head and stainless build, ready to drop into an existing line.
Speed and accuracy
Speed and accuracy trade off against each other. Small-pack units run faster because the pack settles on the load cell quickly. The CW-100G Pro reaches 300+ packs per minute, the CW-1.2K is around 120, and the CW-60K typically settles between 30 and 60 packs per minute. The control head smooths and filters the live signal, so the real-world accuracy on a moving belt stays close to the static accuracy of the load cell.
Hygienic design and IP rating
For food and dairy plants, choose a model with stainless conveyors, tool-free belt removal, and an IP-rated control box that can take wash-down. The same machine in standard build is fine for warehousing, hardware, chemicals or e-commerce parcel checks.
Integration with your line
Every checkweigher in the range exposes weight, reject, and statistics data over RS232/RS485, Ethernet, and standard fieldbus protocols. That means the unit can feed live OEE data into your PLC or SCADA, push pack-level weight records to a database, and drive the reject mechanism, label printer, or downstream divert gate directly from the controller.
Checkweigher FAQ
What does a dynamic checkweigher do?
A dynamic checkweigher weighs every pack as it moves down the conveyor and automatically rejects or sorts items that are outside your target weight band. It catches under-fills, over-fills, missing components, and double packs in real time.
How accurate are dynamic checkweighers?
Accuracy depends on capacity. Our small-pack units (up to 1.2 kg) hold around ±0.1 to ±0.5 g, mid-range models (3 to 6 kg) reach ±0.5 to ±1 g, and heavy-capacity systems for 30 to 60 kg sit at ±5 to ±20 g.
What is the difference between a checkweigher, a weight sorter, and a metal detector combo?
A checkweigher only accepts or rejects packs against a single weight band. A weight sorter splits packs into multiple grade lanes by weight, useful for class A/B/C portioning. A combo unit adds a metal detector so contamination and weight are both inspected on the same conveyor.
How fast can these machines run?
Throughput ranges from around 30 packs per minute on heavy-capacity 60 kg lines up to 300+ packs per minute on the CW-100G Pro for tea bags, sachets, and tablets.
Are they suitable for food, pharma, and dairy?
Yes. The food, pharma, and dairy variants are built from stainless steel with hygienic conveyors, IP-rated control boxes, and tool-free belt removal so they can be washed down between batches.
Can the checkweigher integrate with our PLC or ERP?
Yes. The control head outputs weight, reject, and statistics data over RS232/RS485, Ethernet, and standard fieldbus protocols, so the checkweigher can talk directly to your PLC, SCADA, or production reporting system.
