Packaging Machine/

Dynamic Checkweigher

Item Dynamic Checkweigher
Rejection Air Jet/Push Plate/Arm
Controlling System High Speed A/D Sample Controller
Control Panel Touch Screen
Recipe Storage 99
Compressed Air Pressure 0.6-0.8 Mpa/6-8 Bar
Working Environment Temperature: 0℃-40℃/Humidity: 30%-95%
Frame SUS304
Machine Hand Facing HMI, Left to Right

  • Product Detail
  • Inquiry

Dynamic Checkweigher

Whether you want to check the weight of food, drinks, medicines, health products, 3C electronics, daily chemicals, or agricultural and sideline products, the dynamic checkweigher can be your right helper.


It can help you eliminate overweight or underweight products so that standard-weight products can reach every customer, which not only avoids increasing costs due to overweight but also avoids offending consumers due to underweight.


SiroSilo in-motion checkweigher’s weighing range is 20g-40Kg.

If your product weight is out of this range, you are welcome to contact us via WhatsApp or Email for customization, such as the roller conveyor scale shown in the photo below:


Email: info@sirosilo.com

WhatsApp: +8617312124727

What is Dynamic Checkweigher?

A dynamic checkweigher weighs each item passing through the production line, classifies each passing product according to the preset weight zone, and then releases or rejects the product based on the weighing results.

Simply put, checkweighers weigh, sort, and separate products.

Working Principle

Please refer to the photo below to better understand the working principle of the in-motion checkweigher.


The product passes through the infeed conveyor first, conveying a single product at a time within a specific time interval.

Then, the product forwards to the scale conveyor and presses the load cell sensor, completing the product checkweighing.


Load Cell Sensor

Last, the weighed product comes to the outfeed conveyor, and the rejector discharges the overweight/underweight product from the conveyor.


Industries such as pharmaceuticals, food & beverages, cosmetics, and logistics have introduced a large number of in-motion checkweighers to the end of production lines.



Checkweighers have the following applications in these industries:

  • Overweight/Underweight Products Rejection
  • Product Weight Grade Classification
  • Production Line Efficiency Monitoring
  • Missing Components (Caps, Lids, Labels, Accessories) Detection
  • Reports Generation for Production Line Process Analysis & Adjustment


The following figure is a structural schematic of an in-motion conveyor scale.


As can be seen from this figure, the inline conveyor scale consists of three sections:

  1. Infeed Conveyor
  2. Checkweighing Conveyor
  3. Outfeed Conveyor

The components it contains are:

  • 304 Stainless Steel Frame
  • Conveyor Belt
  • Emergency Stop Switch
  • Guide Inlet
  • HD Touchscreen
  • Photoelectric Sensor
  • Power Switch
  • Quick Release Buckle
  • Rejector
  • Stack Alarm Light
  • Stainless Steel Leveling Foot


Based on different weighing ranges, the following types of SiroSilo in-line checkweighers are available:

Model CW-120 CW-150 CW-200 CW-300 CW-400 CW-500 CW-600
Weighing Range ≤100g ≤200g ≤1000g ≤3000g ≤20kg ≤40kg ≤40kg
Accuracy ±0.2g ±0.2g~±0.5g ±0.3g~±1g ±0.5g~±3g ±1g~±5g ±5g~±20g ±5g~±20g
Min. Scale 0.01g 0.1g 0.1g 0.1g 1g 1g 1g
Conveying Speed ≤30m/min 40-70m/min 60-90m/min 60-90m/min 30-60m/min 25-50m/min 25-50m/min
Max. Speed 100 pcs/min 200 pcs/min 160 pcs/min 80 pcs/min 60 pcs/min 40 pcs/min 35 pcs/min
Item Size Length ≤50mm ≤150mm ≤300mm ≤300mm ≤500mm ≤650mm ≤650mm
Width ≤50mm ≤120mm ≤180mm ≤270mm ≤350mm ≤440mm ≤530mm
Belt Size Length 250mm 200mm/300mm 400mm 450mm 620mm 1075mm 1200mm
Width 120mm 150mm 210mm 300mm 400mm 490mm 600mm
Rated Power 0.1Kw 0.1Kw 0.15Kw 0.4Kw 0.4Kw 0.4Kw 0.4Kw
Power Supply AC 380/220/110V±10%, 50/60Hz

Checkweighers with different weighing ranges apply to different items.

CW120: ≤100g

CW120 usually adopts an air jet rejector, it’s suitable for small sachet checkweighing, such as:

  • Tea
  • Drug
  • Candy
  • Granules
  • Powder


Although it is small, it is completely functional:

  • Underweight Detection
  • Overweight Detection
  • Missing Detection
  • Empty Detection

CW150: ≤200g

The belt width & length of CW150 are 150mm & 300mm respectively, its max. weighing range is 200g, and its compatible max. product size is L150mm × W120mm.

It is also suitable for checkweighing products packaged in small sachets and cartons.

  • Front View


  • Left View


  • Right View


CW200: ≤1Kg

CW200 is suitable for products whose weight is ≤1000g and the product package length and width are less than 300mm and 180mm respectively.

  • Front View


  • Left View


  • Right View


The belt width and length of this model are 210mm and 400mm respectively, and the maximum speed is 160 times per minute.

CW300: ≤3Kg

If your product weighs less than or equal to 3000g, we recommend you choose CW300 for check weighing.

Its belt length and width are 450mm and 300mm respectively, and the fastest speed can reach 80 checks per minute.

CW400: ≤20Kg

CW400 targets products whose weight is ≥3kg and ≤20kg.

  • Left View


  • Right View


With a 620mm long x 400mm wide belt, it can detect items with a length less than 500mm and a width less than 350mm, and its checking speed can also reach 60 times per minute.

CW500 & CW600: ≤40Kg

Both CW500 & CW600 are suitable for products weighing between 20 and 40kg.

  • CW500


  • CW600 Left View


  • CW600 Right View


The belt width and length of CW600 are larger than that of CW500, but its fastest weighing speed of CW600 is only 35 times per minute, which is slightly slower than CW500’s 40 times per minute.


Please refer to the following form for checkweigher features overview.

Multifunctionality Electronics, medicines, food, chemicals, beverages, and health care products weighing;
Recipe Storage 99 sets, easy product switch;
Simple Operation Weinview color touch HMI;
Easy Maintenance Easy conveyor belt assemble & disassemble, install, maintain, and clean;
Adjustable Speed Frequency conversion control motor;
High-speed & High-precision Weighing Mettler Toledo load cell sensor;
Zero Tracking Manual or automatic clear, dynamic zero tracking;
Inline Integration Metal detectors, X-ray machines, code printers, cartoners, FFS machine, scanners, and tube fillers;
Reports Automatically generate various EXCEL format production reports in real-time;
Reserved Interface PC connection to facilitate data management;
Centralized Control Multiple checkweighers can be centrally controlled through one computer.

Then let’s follow the photos shown below to find out more.

  • HD Touchscreen


  • High-precision Load Cell


  • Quick Rejector


  • 304 Stainless Steel Frame


  • Emergency Stop Switch


  • Stack Tower Light


  • Inline Integration


Item Brand Place of Origin
Touchscreen Weinview China
Power Supply Switch Omron Japan
Solid State Relay Omron Japan
Intermediate Relay Honeywell USA
Frequency Converter Danfoss Denmark
Motor JSCC China
Conveyor Belt YONGLI BELTING China


Hot-searched in-line checkweigher brands include:

If you prefer to purchase from China, you are welcome to contact us for a detailed discussion, a right contact leads to the right result.

Email: info@sirosilo.com

WhatsApp: +8617312124727


In line checkweigher’s price in the Chinese market varies depending on the weighing range and brand, its range is US$3,500.00-8,000.00.

Dynamic Checkweigher Choice

Although checkweigher manufacturers are checkweighing experts, they do not know your production line as well as you do.

Only by combining the manufacturer’s checkweighing expertise and your in-depth understanding of the production line can you find a checkweighing solution that matches your needs.

SiroSilo recommends you start with the following aspects.

Product & Package

Most of the checkweighing is package processing, the package style, size and weight of the product determine the design, accuracy, and auxiliary equipment of the checkweigher.

Popular package styles include:

  • Can
  • Tube
  • Pouch
  • Bottle
  • Bucket
  • Sachet
  • Folding Carton
  • Cardboard Box

According to different product packages, the checkweigher integrates with different conveyors (roller, belt) and guide stabilizing devices.


Ideally, the checkweigher rate perfectly matches the speed of the upstream & downstream equipment.

Because a high checkweighing rate leads to accuracy reduction, excessive pursuit of high speed will sacrifice accuracy.

If you must keep high speed and accuracy due to the output requirements of each shift, we recommend you introduce a lane divider to cut the production line into multiple sub-lines, and each sub-line integrates with a checkweigher.

Weighing Range

The table below shows the weighing range of common conveyor checkweighers in the Chinese market:


As long as your product weighs less than or equal to 40 kg, many manufacturers can supply suitable conveyor checkweighers.

If your product weighs more than 40 kg, you are welcome to contact us for customization.

Email: info@sirosilo.com

WhatsApp: +8617312124727


Because the product moves dynamically with the checkweigher’s conveyor, more factors affect its accuracy:

  • Package Size & Weight
  • Stability in Motion
  • Load Cell Brand
  • Conveyor Type
  • Checkweighing Speed
  • Working Environment

The checkweigher selected after comprehensive consideration of the above factors can meet your accuracy requirements.


Rejector selection depends on product weight, fragility, package style, etc.

Common rejectors on the Chinese market include:

  • Single Arm
  • Double Arm
  • Flip Up Flap
  • Air Jet
  • Push Plate
  • Telescopic Belt
  • Drop Belt
  • Gantry Pusher
  • Fin


Place of Use

Generally speaking, checkweighers will integrate a windshield to protect them from wind and improve their detection accuracy.

In addition to the effects of wind and airflow, the following environmental factors also need notice:

  • Temperature
  • Humidity
  • Salinity
  • Corrosive Environment
  • Explosive Places

Combination & Integration

The checkweigher is integrable with various packaging equipment for combination, such as metal detectors, cartoning machines, FFS, tube fillers, case packers, etc.

In addition, there are all-in-one metal detector checkweighers on the market that integrate metal detection and checkweighing functions.

This all-in-one machine occupies a small area and can simplify your production line, thereby reducing your maintenance time and costs.


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