Electronic weighing instruments, normally tested and approved as nonautomatic weighing instruments (NAWI), are often subsequently used as automatic weighing instruments (AWI) - with or without supplementary devices (feeding device, batching device, etc.). In Germany AWIs are even generally approved for verification, provided they have been tested and approved as NAWIs and the commodity is not in relative movement to the load receptor while being weighed. Furthermore, the stability of equilibrium checking device must be in operation. An additional prerequisite for general approval is automatic zeroing or taring of the load receptor prior to each weighing. This rule remains in force until 2016 for automatic catchweighers (ACW, e.g. ready mix weighing instruments, instruments for producing prepackages), for automatic gravimetric filling instruments (AGFI, producing prepackages of predetermined quantity) and automatic discontinuous totalizers (ADT, weighing instruments for bulk material, e.g. intended to be used in ports when loading and unloading ships).
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