The invention relates to a method for quantitatively andor qualitatively detecting layer thicknesses of biological or chemical molecules by means of ellipsometric measurements. Provided are a casing which encases a catalyst carrier, a mixing pipe, a dispersion chamber which guides exhaust flowing in the mixing pipe to an exhaust inlet end of the casing, and a sensor. The cutting system includes a cutting blade, typically a rotary cutter, and a sacrificial plate or round bar contacting the cutting blade. The dip tube assembly includes an adaptor operatively connected to the vacuum pump and an evacuator component which has a generally tubular configuration and a substantially flat open bottom closely overlying the bottom interior of the tank. A portion of the formed circuit board may be etched in order to selectively create air-bridges 86 or interconnection portions 164. This allows to raise the speech recognition accuracy for tone speech.