| 摘要 |
A transducing device of a concentration detector consists of a non-metallic tube (1), forming a receptacle through which a sample can flow, and two plates in the form of windings of copper foil (2, 3). A de-gausing metallic enclosure (5) surrounds the copper strip windings. To power the transducer, a voltage controller (21) drives an oscillator (22), which triggers a current application circuit (23). The latter has a two connections (24, 25)-pins (1 and 2)-to the respective plates (2, 3). One is at virtual ground potential the other has a steady current applied to it. The voltage between plates is shown in FIG. 4. An output (26)-pin (6)-from the current application circuit is connected to a rectifier (27), in turn connected to an analogue to digital converter (28) from which the output can be input to processsing equipment such as a computer.
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