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How to determine the verification cycle of truck scale
How to determine the verification cycle of truck scale
How to determine the calibration cycle of truck scale? Many customers have asked this question, but because they have not explained it systematically, many of them are half knowing and half solving. Now, let's explain it in detail.
Truck scale is a kind of measuring instrument. In actual work, due to different types, structures and principles of truck scale, many factors should be considered in formulating a reasonable verification cycle. Due to the comprehensive influence of its own performance, use environment, accuracy requirements, maintenance and other factors, determining a reasonable verification cycle is a complex system project. Therefore, it is necessary to scientifically and reasonably determine the corresponding verification cycle on the basis of ensuring that the consequences of the truck scale exceeding the tolerance in use should be as small as possible, and the verification cycle should be appropriately long and the annual verification cost should be economic and reasonable.
How to determine the verification period of truck scale is discussed from the following two aspects: the principle of determining the verification period of truck scale and the basis for determining the verification period of truck scale?
1、 The Principle of Determining the Verification Period of Truck Scale
1. It is necessary to ensure that the weighing instrument has a high qualification rate within the validity period of verification
2. Try to avoid unnecessary material input. That is, if the verification cycle of truck scale is too long, a large number of truck scale may be in the unqualified state within the validity period of verification. However, if the verification period is too short, a certain amount of manpower and material resources will inevitably be wasted. Directly increase the burden on the user or the user of truck scale. Therefore, we must take the above two principles into account when determining the calibration cycle of truck scale.
2、 The basis for determining the verification cycle of truck scale is divided into two categories according to the verification cycle:
1) Compulsory verified truck scale;
2) Truck scale not subject to compulsory verification. The metrological verification regulation of JJG14-1997 Non Self indicating Weighing Apparatus formulated in China clearly stipulates that the longest non automatic verification period shall not exceed one year, which provides a large framework for the determination of the verification period of non automatic weighing apparatus. Within this framework, how can the technical organization implementing compulsory verification specify the verification period of weighing apparatus in combination with the actual use? Mainly based on the following points:
First, the weekly inspection qualification rate of the truck scale is compulsorily verified, which is usually an important indicator for the superior management department to assess its technical organization;
Second, the internal quality of truck scale products;
Third, the use environment of truck scale and other factors. The determination of the verification cycle of non compulsory verification truck scale is usually "determined by the user according to law". Since it is determined according to law, it should comply with the provisions of the relevant national verification regulations. If it exceeds the longest period specified in the verification regulations, the probability of the truck scale out of tolerance is considerable.
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