Method for verifying hopper scales with the use of force standards

The article analyzes existing methods for verifying hopper scales, including the conventional method using weights and such alternative methods as substitution and element-by-element verification methods. The disadvantages of existing methods are identified, as well as the difficulties related to the application of the considered methods. The main problem associated with the verification of heavy-duty scales is the need to handle a large number of weights (loading, unloading, storage, transportation, etc.). In most cases, it is impossible to verify hopper scales using existing methods. In this connection, the problem of metrological support of hopper scales was set and solved. A force method for verifying hopper scales was developed and described. The force method relies on comparing weights to be verified with the 1st-grade force standard using a comparator. As the comparator, the study used a weight- or force-measuring load cells. The article presents the ways and means of implementing the proposed method for verifying hopper scales, as well as the test results that prove the possibility of its application and verification of hopper scales by means of force standards. The force method was used to develop a procedure for verifying VB KONUS scales with the use of a TVS force comparator. The developed method enables a significant reduction in labor intensity, time, and cost of verification. This is particularly relevant in the production of various materials for which accurate weighing of components is critical. The implementation of the force method in verification can significantly improve the assurance of large mass measurements made using scales.