Method of verification hopper scales using force standards

Abstract

Various existing methods of verification hopper scales are analyzed, including the classical method using weights and alternative methods such as the substitution method and the element-by-element verification method. The analysis revealed the shortcomings of existing methods, as well as difficulties in their application. The main problem of verification heavy-duty scales is the need to manipulate a large number of weights (loading, unloading, storage, transportation, etc.). In most cases, checking hopper scales is generally impossible. In this regard, the task of metrological support of hopper scales has been set and solved. A force method for verification hopper scales has been developed and described. The force method is based on comparing the verifiable scales with the standard of force of the 1st discharge using a comparator. A weight-measuring or force-measuring load cell is used as a comparator. The methods and means of implementing the proposed method of verification hopper scales, as well as the results of testing, proving the possibility of its application and verification of hopper scales using force standards, are presented. On the basis of the force method, a method for verifying the WB CONUS scales using TVS comparators has been developed. The developed method makes it possible to significantly reduce the complexity, time and cost of verification. This is especially true in the production of various materials for which accurate component weighing is critical. The introduction of the force verification method can significantly improve the metrological support for measurements of large masses on scales.