Abstract: The invention relates to a rail-guided system for transporting persons and material in underground mining and tunnel construction. The rail-guided transport system comprises a railroad network and transport vehicles that are guided in the railroad network. In the transport system, both the forward end and the opposite end of the respective transport vehicle are equipped with sensors (1-6) for detecting optical, acoustic, thermal, and acceleration data, “forward” being relative to the direction of travel. The sensors (1-6) are connected to a control computer that is disposed inside the transport vehicle while interacting with active and passive transducers located within the railroad network.

Abstract: A measuring instrument (11) for fill level sensors (4) having a measuring electrode (6) and a compensating electrode (9). The measuring instrument (11) has a bridge circuit whose one bridge branch (21) is formed by two series-connected test resistors (23, 24). The other bridge branch (22) is formed by the measuring resistor (17) on the measuring electrode (6) and the compensating resistor (18) on the compensating electrode (9). Between the two bridge branches (21, 22) a diagonal line (26) with a test switch (27) is provided. The measuring instrument (11) is controlled by the control circuit (13) so that the diagonal line (26) is closed outside of preset test time periods, and interrupted at preset test time periods. The end of the diagonal line (26) located between the two test resistors (23, 24) is connected to the base potential (25) of the measuring circuit (12).

Abstract: The present invention relates to a device for continuously monitoring the junction of a conveyor belt which is made of rubber or a rubber-type plastic material and which comprises supports inserted therein for reinforcing the same. In an advantageous embodiment, the device essentially comprises the following constituent members for the junction area: mainly four reference marks, two addresses as well as four detection heads, the heads being located above the carrier surface of the conveyor belt. This invention further relates to other advantageous embodiments of this device.