A detector outputs a detection signal indicating amplitude variation of an input frequency-multiplexed signal. The body includes first and second electrodes for applying a voltage across both ends of passages of the wafer-shaped part to separate and remove the sample solution. A sealing system is also removably connectable to the proximal end of the guidewire assembly and selectively seals the extended sealable section at one of a plurality of separate locations along the extended sealable section to form an airtight seal of the tubular guidewire. In an alternative embodiment, a BLUETOOTH device may be required to transmit data keys andor other pairing operations over a temporary wired connection to another BLUETOOTH device. In accordance with the invention, a plurality of successive trays in each case are joined to one another and form at least two inserts which can be removed from the column pipe. The present invention can be implemented with any number of echo cancellers so long as the each block or packet can be processed within a specified time frame.