The FSP PINTSCH-type train detection system consists of an induction loop installed in the track and the ESD (single-loop detector) module and is used for detection of trains at level-crossing control system strike-in and strike-out points, or as a train approach indicator (ANM) at signal cabins (interlocking towers).
The ESD module consists of an oscillator and a detector system which, together with the induction loop in the track, form a resonant circuit. A resonant circuit frequency of between 22 kHz and 35 kHz, generally around 27 kHz, is set up, depending on the specific dimensions of the track loop. Changes in the electromagnetic field of the induction loop are recognised and evaluated by the ESD detector system.
The induction loop is installed as a "figure of 8" along a length of 2 x 6 sleeper spaces in the track. Our train detection systems are correspondingly generally installed with a length of approx. 6.9 m (length can be varied between 6.3 m and 8.5 m in exceptional cases). The cables are installed in a cable conduit at the rail foot using rail foot clamps. This keeps the loop cable at a defined distance from the iron mass of the track, on the one hand, and protects the induction loops against damage in case of permanent-way works (e.g. ballast-tamping machines), on the other hand. The ESD evaluation module is installed in an SKV20 cable distribution box with ground base in the immediate vicinity of the induction loop.