| 摘要 |
<P>PROBLEM TO BE SOLVED: To get an oscillation frequency of a connected oscillation circuit unit, in a device main body side, when adopting constitution of forming the oscillation circuit unit separately from a device main body including a measuring part, in a sensing device for measuring a concentration of a sensing object or for determining the presence thereof by a quartz sensor. <P>SOLUTION: A plurality of bandpass filters provided with pass characteristics corresponding to the respective oscillation frequencies of the oscillation circuit is provided in the device body side to discriminate a frequency signal. The propriety of satisfying a threshold value or more is get as to a level of the discriminated frequency signal, a switch part is controlled to connect a channel with the level of the threshold value or more, to the measuring part, and a reference frequency, for example, used in the measuring part, is selected according to a frequency of the frequency signal corresponding to the channel. <P>COPYRIGHT: (C)2008,JPO&INPIT |
