Patent ID: 6075312
Filing Date: 2000-06-13
Classification: G01N

Abstract:
A main structure of an flow-injection type piezoelectric sensor, said flow-injection type piezoelectric sensor having a planar surface, an opening located in said planar surface, and a piezoelectric crystal located in said opening, said main structure comprising:a movable stand provided at one end thereof with a retaining slot capable of catching and releasing the flow-injection type piezoelectric sensor, said movable stand being horizontal and movably engaged on one or more upright support pillars;a lifting mechanism located under said movable stand and composed of a rotary shaft and a cam or protruded block fastened with said rotary shaft, said rotary shaft being rotatably mounted on an upright plate such that said rotary shaft can be rotated in one direction so as to cause said cam or protruded block to raise said movable stand, and then said rotary shaft can be rotated in another direction so as to cause said movable stand to descend in light of the gravitational effect; anda fixed injection portion located over said movable stand and provided with a transparent end having a charge channel and a discharge channel, said fixed injection portion provided with a fastening end which is fastened with said one or more support pillars such that said transparent end is capable of making an intimate contact with the planar surface of the flow-injection type piezoelectric sensor at such time when said movable stand is lifted, and that a liquid test sample is thus able to be injected into said charge channel to flow through the piezoelectric crystal before being discharged via said discharge channel.