T-sensor devices that include a main conduit that defines a diffusion space, at least a first and second supply conduit for conveying fluids into the main conduit, and at least one sensor having a sensing zone that extends into the diffusion space in a fixed location relative to the main conduit. The first and second supply conduits are separated by divider from which a diffusion interface extends into the diffusion space. In order to capture sensing information without employing moving the physical location of sensors or employing more sensors, devices according to the invention alter a location of a diffusion interface extending into the diffusion space from a diffusion start point on the divider relative to the sensing zone of the at least one sensor, without altering the fixed location of the sensor relative to the main conduit. Methods of sensing properties of fluids and analytes are also disclosed.