An apparatus for detecting transitions of a monitored volume between a liquid filled state and a gas-filled state, the apparatus comprising: a sensing capacitor having a separated pair of electrodes (116, 118) and a gap therebetween, the sensing capacitor being configured to cause the gap to be filled by a liquid contained within the monitored volume, residual droplets and/or a coating of the liquid remaining in the gap after said liquid is removed from said gap; and capacitance measuring electronics configured to: measure a minimum capacitance of the sensing capacitor before the gap of the sensing capacitor is filled by the liquid, said minimum capacitance being measured when the gap is devoid of substantially all traces of the liquid; determine an initial gas-to-liquid transition threshold according to the measured minimum capacitance; measure a maximum capacitance of the sensing capacitor when the gap of the sensing capacitor is filled by the liquid; determine an initial liquid-to-gas transition threshold according to the measured minimum and maximum capacitances (302, 306); measure a baseline capacitance of the sensing capacitor after the liquid has been drained from the gap of the sensing capacitor, said baseline capacitance being measured while residual droplets and/or a coating of the liquid remains in the gap; determine an adjusted GTL transition threshold and an adjusted LTG transition threshold according to the measured maximum and baseline capacitances (302, 304); and provide an output indicating that a GTL or LTG transition has occurred if the capacitance of the sensing capacitor crosses above the adjusted GTL threshold capacitance or below the adjusted LTG threshold capacitance, respectively. a sensing capacitor having a separated pair of electrodes (116, 118) and a gap therebetween, the sensing capacitor being configured to cause the gap to be filled by a liquid contained within the monitored volume, residual droplets and/or a coating of the liquid remaining in the gap after said liquid is removed from said gap; and capacitance measuring electronics configured to: measure a minimum capacitance of the sensing capacitor before the gap of the sensing capacitor is filled by the liquid, said minimum capacitance being measured when the gap is devoid of substantially all traces of the liquid; determine an initial gas-to-liquid transition threshold according to the measured minimum capacitance; measure a maximum capacitance of the sensing capacitor when the gap of the sensing capacitor is filled by the liquid; determine an initial liquid-to-gas transition threshold according to the measured minimum and maximum capacitances (302, 306); measure a baseline capacitance of the sensing capacitor after the liquid has been drained from the gap of the sensing capacitor, said baseline capacitance being measured while residual droplets and/or a coating of the liquid remains in the gap; determine an adjusted GTL transition threshold and an adjusted LTG transition threshold according to the measured maximum and baseline capacitances (302, 304); and provide an output indicating that a GTL or LTG transition has occurred if the capacitance of the sensing capacitor crosses above the adjusted GTL threshold capacitance or below the adjusted LTG threshold capacitance, respectively. measure a minimum capacitance of the sensing capacitor before the gap of the sensing capacitor is filled by the liquid, said minimum capacitance being measured when the gap is devoid of substantially all traces of the liquid; determine an initial gas-to-liquid transition threshold according to the measured minimum capacitance; measure a maximum capacitance of the sensing capacitor when the gap of the sensing capacitor is filled by the liquid; determine an initial liquid-to-gas transition threshold according to the measured minimum and maximum capacitances (302, 306); measure a baseline capacitance of the sensing capacitor after the liquid has been drained from the gap of the sensing capacitor, said baseline capacitance being measured while residual droplets and/or a coating of the liquid remains in the gap; determine an adjusted GTL transition threshold and an adjusted LTG transition threshold according to the measured maximum and baseline capacitances (302, 304); and provide an output indicating that a GTL or LTG transition has occurred if the capacitance of the sensing capacitor crosses above the adjusted GTL threshold capacitance or below the adjusted LTG threshold capacitance, respectively.