Liquid level measurement by means of a sight glass and additional electronic means

摘要

An apparatus (1) for the indication of the level of a liquid contained within a tank, to be applied externally to the tank, comprising: - a visual indicator (2) of the level of liquid having a sealed cavity (6) and at least one transparent wall (8) for making the interior of the cavity visible, - a liquid bypass structure (3) for supporting the visual indicator applicable to the tank and such as to allow the passage of liquid between the tank and the cavity. <??>The apparatus is characterised by additionally comprising an electronic measurement device (35) for the level of a liquid derivable from the tank suitable for transmitting a signal carrying information relating to the level of the liquid in the tank to the outside of the apparatus. <IMAGE>