High-precision intelligent acidity meter and measuring method thereof
A acidity meter, high-precision technology, applied in the direction of measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problems of large environmental impact, cumbersome operation, low precision, etc., to improve resolution, improve measurement accuracy, improve The effect of degree of automation
Active Publication Date: 2014-06-25
HOHAI UNIV
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Problems solved by technology
[0005] Technical problem: most of the existing pH meters are calibrated manually, and the temperature compensation is also carried out by manually adjusting the knob. This method has the defects of cumbersome operation, great influence of the environment and low precision
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[0030] Below in conjunction with accompanying drawing, the present invention is described in further detail:
[0031] Such as figure 1 Shown is a structure diagram of the high-precision intelligent acidity (PH) meter of the present invention, and the PH meter includes a single-chip circuit 1 , an A / D conversion circuit 2 , a power supply circuit 3 , and a man-machine interface circuit 4 . The power supply circuit 3 supplies power to the single-chip microcomputer circuit 1, the A / D conversion circuit 2, and the man-machine interface circuit 4 respectively. The A / D conversion circuit 2 and the man-machine interface circuit 4 are connected to the single-chip microcomputer circuit 1 respectively. The single-chip microcomputer circuit 1 uses a single-chip microcomputer as the core to collect and calculate data. The man-machine interface circuit 4 includes LCD, keyboard and buzzer for displaying, inputting information and alarming. The A / D conversion circuit includes a temperatur...
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The invention discloses a high-precision intelligent acidity meter and a measuring method thereof. According to the invention, the A / D (analog / digital) switching circuit of the high-precision intelligent acidity meter comprises a temperature sensor, a PH sensor, a first operational amplifier, a second operational amplifier, a multichannel analog switch and an A / D converter, wherein the output ends of the temperature sensor and the PH sensor are respectively connected with a plurality of input ends of one channel of the multichannel analog switch through the first operational amplifier and the second operational amplifier; the multichannel analog switch is connected to the other channel of the multichannel analog switch; and the two output ends of the other channel are respectively connected with resistors in different resistance values. According to the measuring method, a calibration method for automatically identifying a standard liquid is adopted in the processes of one-point correction and two-point correction, and meanwhile, the PH values of the standard liquid and the measured liquid are calibrated by virtue of a temperature compensation method. According to the high-precision intelligent acidity meter and the measuring method thereof, the PH value of the calibrated standard solution can be automatically identified, and the PH value of the standard solution can be calibrated according to the ambient temperature, so that the manual operation is reduced and measuring precision of the PH value is greatly improved.
Description
technical field [0001] The invention discloses a high-precision intelligent acidity (PH) meter and a measuring method thereof, belonging to the field of electronic measurement and control. Background technique [0002] With the development of scientific research and the progress of production technology, the quantitative analysis of moisture has been listed as one of the basic items of physical and chemical analysis of various substances. As an important quality index of various substances, its pH value is the most important important data. In addition, the requirements for the measurement and control of the pH value of liquid and solid mixtures in the production process or in environmental protection are also increasing, so the use of acidity meters as analytical instruments is becoming more and more popular. The acidity meter is referred to as a PH meter, which consists of two parts: an electrode and a measuring circuit. If the electrodes can be maintained reasonably, th...
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IPC IPC(8): G01N27/00
Inventor 严锡君余敏严妍孟祥薇孙桐王玲玲卜旸
Owner HOHAI UNIV