| 摘要 |
PROBLEM TO BE SOLVED: To facilitate measurement work in detecting whether or not a measuring object exists or its concentration by using a plurality of crystal sensors each equipped with a Langevin-type crystal oscillator. SOLUTION: A crystal sensor 3 is mounted on a printed board 4 via a base body 5. The crystal sensor 3 is equipped with the crystal oscillator 30, with an adsorption layer being formed on one face side thereof for adsorbing a measuring object component while the other face side thereof contacting with an air-tight space. The plurality of crystal sensors 3 are demountably mounted severally, with the adsorption layer upward directed, on a plurality of connection terminal parts provided in a crosswise disposed manner on a side face part 21 of a measuring instrument body 2 via a connection terminal part 41 formed on one end side of the printed board 4. The instrument body 2, comprising an oscillation circuit 71 electrically connected to the crystal sensor 3, detects a change in the characteristic frequency of the crystal oscillator caused by putting the specimen solution into contact with the adsorption layer to measure at least either the existence of the object component in the specimen solution or the concentration of the object component based on the result of detection. COPYRIGHT: (C)2006,JPO&NCIPI
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