The difference between checkweigher and scale
A. Static checkweighers measure the weight of products that stand still. Dynamic checkweighers weigh products in motion.
B. Static checkweighers are used for manual weighing of products or for sample spot-checking. Dynamic checkweighers automatically check 100 % of the products produced.
C. Static checkweighing is a labour intensive process. It requires manual product weighing, recording of the result and then product removal for the next weighing procedure. Dynamic checkweighing is entirely automatic. Products are weighed as they pass along a production line, with off-weight products rejected from the production line by automated removal devices such as pneumatic pusher arms or air-jets.
1. Weighing speed
Scales: Workers place items on scales and check that the displayed results are within specified tolerances.
Checkweigher: Usually provides a small graph or light indicating that the weight is within tolerance. It can reduce operator error rate and increase throughput, but requires input of target and tolerance.
2. Weighing and sorting
Scale: The operator places the empty container on a common scale, tares it, and begins portioning. After reaching the specified tolerance range, the operator removes the tare weight and starts the next sorting.
Checkweigher: Provide functions such as "automatic tare", which can remove the tare weight of a single container weight, which can reduce the error rate of operators and increase the throughput.