Check Weigher
Behpoo check weighers weigh every pack in motion and reject those outside tolerance. Bag weights up to 50 kg at line speeds set by your filler, with no interruption to production flow.
A check weigher weighs each pack as it passes over a dedicated weigh belt mounted on load cells. The reading is compared against the set limits, and out-of-tolerance packs are automatically removed from the line.
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Three belts work in sequence: an infeed belt that spaces and squares the pack, the weigh belt itself, and an outfeed belt carrying the reject mechanism. The measuring window — the time the pack is fully on the weigh belt and nothing else — is what sets achievable accuracy, so Behpoo sizes belt length, frame stiffness and belt speed against your pack dimensions and target throughput.
Beyond rejection, the check weigher is a process instrument. Trend data from it tells you whether your filler is drifting, and feeds back into filler set-points to cut giveaway.
In the line, it sits directly after the filling and closing machine, usually followed by a metal detector before palletising.
Benefits & Features
- 100% in-motion weight control, no line stoppage
- Automatic rejection of underweight and overweight packs
- Vibration-isolated weigh frame for stable readings
- Automatic zero tracking between packs
- Statistical reporting for filler performance and giveaway
- Reject mechanism matched to pack type and line speed
- Stainless steel and washdown execution available
Product Range
| Type | What it is | Typical use |
|---|---|---|
| Standard Industrial | Three-belt configuration with pneumatic pusher reject | 25–50 kg sacks on bagging lines |
| High-Speed | Extended weigh belt, higher natural frequency frame, fast reject | Where throughput leaves a short measuring window |
| Heavy-Duty | Reinforced frame and belts for abrasive and heavy packs | Cement, minerals, fertilizer |
| Washdown / Hygienic | Stainless steel, IP65+ sealing, tool-free belt removal | Food and pharmaceutical lines |
| Legal-for-Trade | Approved instrument to the required OIML accuracy class | Where net weight is a legal declaration |
Available Options
| Option | Choices |
|---|---|
| Reject mechanism | Pneumatic pusher · Air blast · Diverter belt · Drop flap · Retracting belt |
| Load cell count | 1 · 2 · 4 |
| Frame material | Painted carbon steel · SS304 · SS316 |
| Enclosure | Standard · IP65 washdown |
| Reporting | Local display · SCADA integration · Filler feedback loop |
| Safety | Standard · ATEX |
Technical Specification
| Parameter | Unit | Range |
|---|---|---|
| Pack weight range | kg | 0.05 – 60 |
| Accuracy | g or % | ±0.5 g – ±0.2 % |
| Throughput | packs/min | 20 – 250 |
| Weigh belt length | mm | Sized from pack length + measuring window |
| Belt speed | m/s | 0.3 – 1.5 |
| Load cells | pcs | 1 – 4 |
| Frame material | — | Carbon steel · SS304 · SS316 |
| Installed power | kW | 0.5 – 2.2 |
| Compressed air | barg | 6 – 7 |
| Hazardous area | Zone | 20 / 21 / 22 on request |
Areas & Application
Cement & Building Materials
Weight control on 25 and 50 kg sack lines, where underweight packs create customer claims and overweight packs are pure material loss.
Fertilizer & Agriculture
Verification of filled sack weight before palletising, with trend data used to correct filler drift across a shift.
Polymers & Chemicals
Weight control on granule and powder packs, in ATEX execution where required.
Food & Feed
Legal net-weight verification in stainless steel washdown execution.
Options & Compliance
- MaterialsPainted carbon steel · SS304 · SS316
- Hazardous areaATEX execution for Zone 20 / 21 / 22
- EnclosureIP55 standard · IP65 washdown
- Control interfaceProfinet · Modbus TCP · EtherNet/IP, with statistical reporting and filler feedback
- StandardsOIML R51 automatic catchweighing instruments · OIML R87 prepackage content · OIML R60 load cells · ISO 12100
Send us your pack dimensions, weight and line speed — we will size the weigh belt and confirm achievable accuracy.