LIQUID LEVEL SENSING DEVICE

摘要

The invention is directed to a liquid level sensing device having a float (4) configured as a hollow body and slidably mounted on a slide tube (3) for the actuation of reed-type switches (11) provided ln the interior of the slide tube (3). In order to perform a check for proper functioning, the float (4) is movable independently of the filling level into a signalling position by an electromagnetic actuation device (15). The hollow space (7) of the float (4) contains a gas pressurized to above or below atmospheric and is connected via a flexible tube (12) to a pressure monitoring device (13) which responds whenever the gas pressure deviates from a predetermined value.