Tams Elektronik Track occupancy detector GBM-8.2 Item 52-01187-01, ready device in a case, Dim.: 100 x 98 x 35mm, with adjustable sensitivity (min. 1mA), so that disturbances from the digital system have no influence on the occupancy reports, monitoring of a maximum of 8 independent track sections for systems up to nominal Scale II/G with a current consumption of max. 6.000mA per section, for the use in digital systems: 8 inputs and outputs each (max. 50mA !!!) electrically isolated, outputs also for direct connection of the inputs of the s88 feedback devices S88-3, (S88-4) and S88-6 provided, regardless of the digital format with which the system is controlled, typical application: combination with feedback devices that read ground contacts. Use in analogue systems: Suitable for analogue DC or AC systems, for visualizing the occupied track sections on external LEDs (max. 50mA !!!, e.g. in a control panel). In DC systems, if an axle of a vehicle is coated with resistance paint, the lowest sensitivity setting is sufficient to generate an occupancy message, and only vehicles that are driving into the monitored track section from one direction are recognizable. If the detection of vehicles from both directions of travel is required, the use of a GBM-1 track occupancy detector is recommended instead of a GBM‑8.2. The GBM-8.2 is only partially suitable for connecting relays or other circuits that switch to ground, as the maximum current of the outputs is limited to 50mA. The 4-fold track occupancy detector GBM-1 is better suited for these applications. In switched-off track sections: For this purpose, a resistor with a maximum value of 1.5kOhm must be installed in the supply line to the relevant track section in such a way that it bridges the switch when switched off, or the supply voltage is applied to the track sections that are not monitored. As soon as the GBM-8.2 detects a current consumer in a connected track section, the associated output is internally connected to output M, and thus acts like a switch to GND. Voltage supply: Directly via the rails, the track sections must be in a booster circuit or be supplied via one common driving transformer.

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