Sensing instrument

Details Sensing instrument Sensing instrument

2007-09-27

2011-11-08

Surin, J M Saint (Department: 2856)

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

C073S073000

Reexamination Certificate

active

08051714

ABSTRACT:
In a sensing instrument using a quartz sensor on whose front surface an adsorption layer for adsorbing a substance to be sensed is formed and which changes in natural frequency by the adsorption of the substance to be sensed, the present invention has an object to quickly detect a trouble of the quartz sensor to prevent an operator from recognizing an incorrect measurement result. In the present invention, a level detecting circuit detecting a signal level of an oscillation output of an oscillator circuit is provided, and after the time for stabilization passes after the power-on time, a computer takes a level detection value therein to compare the signal level and a threshold value. Then, when the signal level is lower than the threshold value, the signal level is determined as abnormal and, for example, the abnormality notification is displayed on a display unit, whereby an operator is notified of the occurrence of the abnormality.

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patent: 2005-9862 (2005-01-01), None

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