A method of checking the loading and unloading of tankers by means of an electromagnetic identification system, and an identification system for use in said method.

摘要

A method of, and apparatus for, checking the loading and unloading of a tanker having at least one tank provided with a metal connecting pipe adapted to be coupled via a coupling to one end of a hose having a coupling at two ends, which hose can be coupled to a metal connecting pipe of a storage tank. The hose used is provided with an electric conductor (30) extending between the couplings for the dissipation of electrostatic charges and the chassis of the tanker is grounded. A first inductive coupling is effected between one of the connecting pipes and an interrogator (41) of an electromagnetic identification system, and a second inductive coupling is effected between the other connecting pipe and a passive responder (42) generating a coded signal in an interrogation field. Thus an interrogation field formed by the interrogator cooperates via the first inductive coupling, the one connecting pipe, the electric conductor of the hose, the other connecting piepe, and the second inducting coupling with the responder. The code of the responder is checked prior to loading or unloading.