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Tips For Maximizing The Effectiveness Of Your Counting Scale

March 11, 2021

Tips For Maximizing The Effectiveness Of Your Counting Scale

Counting using the counting scale can give you accurate results in less time than counting or other methods. However, some common errors should be avoided when using the counting scale, which can improve the speed and accuracy of the calculation results. For those who may not be familiar with them, counting scales use average piece weight (APW) to determine the number of parts on the scale. The operator takes a small sample from the item to be weighed and enters the count into the scale. The scale then calculates the APW, so when an unknown quantity is placed on the scale, it will determine exactly how many APWs there are.

The benefits of the counting scale include:

Speed.

Easy to use.

Short installation time.

Get more accurate results in a shorter time than other methods.

Human error

The most common source of error in counting is human error. The operator must remember to zero the scale between measurements and tare any containers. The data about the sample must be accurate (that is, there must be 10 pieces in the sample, not 9 or 11 pieces), and the count must be entered on the scale correctly. You will be surprised how many results will be thrown just because someone did not count correctly!

Piece weight deviation

The greater the difference in weight of each piece, the greater the inaccuracy of counting. This is why you cannot calculate mixtures of different parts. However, the reality is that there are block weight changes in most processes, and your application needs to be able to cope with it.

First, make sure you select the correct number of parts to sample. The closer to the full weight, the better. However, you need to balance counting accuracy with the time required for the operator to manually count the samples. The largest sample that can be conveniently and accurately hand counted is ideal. You may also need to extract new samples more frequently than you think. When calculating different machines or different batches of products, consider a new sample.

Finally, container weight deviation will also affect your counting: if you use small parts, the weight deviation of one container and another container will add up to 5 or even 10 pieces. In order to reduce the risk, you have to tare your container frequently.

Envirnmental factor

The design of the counting scale can solve very small parts. This means that they are not only very accurate, but also very sensitive to interference from the surrounding environment.

Common environmental factors that affect counting include:

Draft.

Temperature change.

Vibration.

Unstable power supply.

Electrostatic charging.

Not a horizontal plane.

Scale accuracy

As mentioned above, in order to distinguish small and independent parts, the counting scale is very precise. However, in general, to obtain this accuracy, the maximum capacity of the balance is a trade-off. Therefore, large scales cannot accurately weigh small parts, and small scales cannot bear a total weight that exceeds its maximum capacity.

To solve this problem, consider using a small reference scale to weigh the sample to obtain the best APW possible. Next, use a connected but remote base to weigh your entire, unknown quantity to get an accurate count of the heavier quantity.

We are counting scale manufacturers. If you are interested in our products, please feel free to contact us.

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