The problems that should be considered in determining the verification period of floor scale

1.  Performance of floor scale
There are many kinds of floor scale, and the use direction is determined by the difference in performance, which is also the basis of periodic analysis. After a period of time, the performance stability of floor scale will be reduced due to wear and other reasons, but this phenomenon also has a certain period of time. When analyzing the error, the technical personnel should master the parameter standard of the floor scale at the time of delivery, and judge whether the accuracy is decreased by comparison. The production process has strict requirements on the accuracy of floor scale.

Once the error parameters are applied to the determination environment of raw materials, the quality of the products produced will decrease. Therefore, when setting the cycle, the interval time of the new scale is relatively long. As the usage time increases, the wear and tear becomes more serious, and the cycle should be changed accordingly, so as to finish the task more reasonably. As maintainers gain experience and time passes, product reliability improves. Generally speaking, the verification cycle for newly installed floor scales is 3-6 months, and the floor scale user should be kept in touch. Once problems are found, timely verification should be carried out, and the verification cycle should be scientifically extended as the use time is prolonged.

 2.  Frequency of use of floor scales

If the scale is used frequently or overload, the verification period should be shortened accordingly. For example, the floor scale used in the port, once encountered special circumstances overload use, it is necessary to do time tracking verification.

 3.  Maintenance effect of scale

Platform balances the use of the party will take certain measures to maintain weight bridge, so it is easier to find problems, eliminate the problems in the initial stage, reduce unnecessary loss and dispute, reduce the maintenance cost and guarantee the accuracy of the weighing apparatus value, therefore, verification personnel and institutions to maintain good verification platform balances can be reasonable to extend verification period.

The determination method of the verification period of floor scale

1) The chart method

In the process of each weighing, the same measuring point selected should be representative to a certain extent. The testing results should be drawn into a curve according to time, and the effective drift amount of the weight should be calculated according to the curve. The calibration period of the weight can be obtained according to the chart data.

2) The comparison method

According to a certain verification period, the verification data are compared with the previous data. If the results of multiple verification are within the tolerance range, the verification period can be extended. If the result of weighbridge verification exceeds the tolerance, the verification period shall be shortened.

3) Statistics

During the verification of floor scales, the percentage of unqualified floor scales in  the inspected floor scales shall be counted for the floor scales of the same grade.

4) The timing method

The calculation of the calibration period of the floor scale is determined not according to the installation time, but according to the working hours of the floor scale. The working hours of the floor scale can be obtained by using the timing device connected with the floor scale. As long as the floor scale works, the timing device will time the floor scale. Once the timing reaches a certain time, it is necessary to send the floor scale for inspection. Before adopting the timing method, it is necessary to conduct a comprehensive test on the scale with the same stability, principle, structure and accuracy level, so as to determine the working hours more scientific and reasonable.