A method and system is presented which provides a TDM framework for managing self-describing measurement data. This in turn responds to the presence of an object or an environmental condition causing absorption andor reflection. A filler is located inside the pipe, between the electric wire and the pipe, and the filler has a heat conductivity higher than that of air. At least one of the LEDs is coated with a phosphor material so that different wavelengths of light are generated by the LEDs while the same wavelength of light is emitted from the light-emitting structure. The two or more different anti-hapten antibodies may be conjugated to different detectable labels.