The switching amplifier is mounted in safe areas and operated together with a transducer model LSO.06. The signal circuit is intrinsically safe. The switching amplifier model LSO.25 may be used together with the instrument transformer model LSO.06 as overflow control.

For the 19" plug-in card version, all operating elements, except for the switch for changing the alarm direction and the potentiometers for the time delay, can be accessed from the front.

If incorporated in a mounted case, a transparent lid allows seeing the switching statuses.