| 摘要 |
<p>Inside the meter, adapted to prevent misuse by using interfering magnetic fields is a threshold detector (1a', 1a'') of the magnetic field density which is made as an activator (1a', 1a''), and as a single-sided attached ferromagnetic feeding bar, which is when subjected to a magnetic field exceeding the threshold level released from one end of a gravitation bar (3a) assigned to such an activator (1a', 1a''). This bar is on the other side rotationally attached and shows if a magnetic field exceeding the threshold level was detected. In preferred applications it is possible to establish with certainty whether its interior has been subjected to an interfering magnetic field of such a density that lead to incorrect or interfered operation.</p> |
