A body interface device (14) for a urine aspiration system comprises a skin contact pad (20) with gel adhesive for adhering to the skin, and a flexible cover (24) attached to the pad. The pad includes at least one aperture (26) for admitting urine through the pad into the body interface device. The flexible cover has a bulged form projecting away from the gasket. The flexible cover defines a urine receiving chamber (34) facing towards the gasket, and recess facing away from the chamber for receiving at least a portion of a non-contact liquid sensor (18). The recess and chamber have a wall portion in common that separates the recess and the chamber. A liquid acquisition material (22) in the chamber receives and transports urine for rapid sensing by the non-contact sensor. An aspiration unit is responsive to the non-contact liquid sensor to apply aspiration suction to the body interface device, upon detection of urine.
