Patent ID: 8051714
Filing Date: 2011-11-08
Classification: G01N,G01R

Abstract:
1. A sensing instrument which uses a sensing sensor including a piezoelectric resonator changing in natural frequency by the adsorption of a sample and which senses the adsorption of the sample based on the change in the natural frequency of the piezoelectric resonator, the instrument comprising: an oscillator circuit oscillating the piezoelectric resonator; a measuring unit measuring a signal regarding a frequency of an oscillation output of the oscillator circuit; a level detecting circuit detecting a signal level of the oscillation output of the oscillator circuit; a level determinator determining that the signal level is normal when the signal level detected by the level detecting circuit is equal to or higher than a threshold value, and determining that the signal level is abnormal when the signal level is lower than the threshold value; and a notifier notifying that the signal level is abnormal when the signal level is determined as abnormal by the level determinator.