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2.2 Measuring Principle
The core parts of the apparatus are all microcomputers. The entire system is controlled by microcomputer
chips and the main components include:
A) Sampling component
B) LCD Screen
C) Motor operation components
D) Printer
E) Control Keys
Diagram 1- Overall operational diagram
Diagram 2- Sampling Diagram
The TC-720 plus can determine the intensity of different colors on the reagent strip test area. It
does this by irradiating the test area with light and detecting the reflectance of different
wavelengths using an integrated sphere photo-detector. This photo-detector is filtered to
measured wavelengths of 550nm, 620nm, and 720nm using the integrated sphere. 720nm is the
reference wavelength and the combination of 550nm and 620nm light is used to differentiate
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