Patent ID: 9109938
Filing Date: 2015-08-18
Classification: G01F

Abstract:
1. A sensing device, comprising: an electrode pair configured to be positioned within a substance, a voltage being established between the electrodes when a substance establishes contact across said electrode pair, the voltage being dependent on at least a type of the substance; a sensing circuit connected to said electrode pair and having an output, the sensing circuit being configured to switch the value of the voltage at the output when the substance establishes contact across said electrode pair; and an output circuit connected to said output of said sensing circuit and configured to provide an output signal on a terminal, the output signal representative of the presence of at least a type of the substance across said electrode pair; and means for allowing said output signal to take different voltage and/or current and/or frequency values, such that first values which are representative of the presence, level and the at least a type of the substance can be discerned on said terminal and such that second values representative of faults of said device can be discerned on the same terminal.