CN2206963Y - Measuring instrument for intelligence water quality fluorine ion - Google Patents

Abstract

The utility model discloses a measuring instrument for intelligence water quality fluorine ions. An analog amplifier is composed of an ion selective electrode and a compound operation amplification device; after collected weak current signals being amplified, the collected weak current signals are input to an analog to digital converting device which is composed of four-bit semi-A/D convertors, then are output to an I/O interface which is composed of 81C55 parallel interfaces at BCD codes; the An interface and the C interface of the I/O are mutually connected with the A/D convertor for inputting the digital quantity and the state words converted by the A/D; the B interface is used for connecting with a miniature printer; the I/O interface is mutually connected with a center control device microcomputer processor through buses; the microcomputer processor completes the total intelligent control processing through softwares.

Description

Measuring instrument for intelligence water quality fluorine ion

The utility model relates to the test fluid ionic potential, the instrument of ion concentration and sample pH value.

Domestic most of ion measurement instrument is numeral demonstration MV value or shows with the meter pointer formula at present.This type of instrumentation bothers (hand computation is the result easily make mistakes) and can only use in the laboratory, can not use at power free field condition.The ion measurement instrument that some are more advanced, as Shanghai thunder magnetic instrument plant, Jiangsu Electrical Analysis Instrument Factory, the product of Guangzhou Electronic Instruments Plant of Zhongshan University, though the employing microcomputer technology is arranged, can not on-the-spot use the out of office.China municipal works China is than the portable fluorine-detector of designing institute's development in 1985, though can use at the scene, but function is limited, can only survey single fluorinion concentration, and precision lower (≤20%FS), the U.S.'s portable ionometer of 290A type can use at the scene, demarcate at the scene but must carry the titer sample, after returning the laboratory, carry out data processing, printout with computer interconnection again, this machine costs an arm and a leg, and inconvenience is popularization and application at home.

The purpose of this utility model provides a kind of at non-lab environment or under away from field, cities and towns non-transformer environment, water quality is carried out the multifunction ion determining instrument of the portable intelligentization of field test.

The purpose of this utility model is achieved in that it constitutes high input impedance by one by ion-selective electrode and compound operation amplification, high stable, the analogue amplifier of low drift, with inputing to the analog-digital commutator that constitutes by four and half A/D transducers after the weak electric signal amplification of gathering, output to the I/O interface that constitutes by the 81C55 parallel interface with binary-coded decimal again.The A mouth of I/O interface, the C mouth is connected with the A/D transducer, is used to import digital quantity and status word through the A/D conversion, and the B mouth is used to connect mini-printer.The I/O interface links to each other with center control device computer processor by bus, and computer processor is finished whole intelligent control and treatment by software, and by connected liquid crystal indicator display result.Its command function and data parameters input are realized by the keyboard matrix device.Power supply adopts ickel-cadmium cell and alternating current steady voltage plug, is switched by change-over switch, by DC/DC transducer supply ± 5V voltage.

The utlity model has following characteristics: 1 usefulness microcomputer technology can be measured ionic potential to the surveying instrument intellectuality, ion concentration, multiple number such as pH value.Measure electrode parameter in advance by keyboard, use in the open air, need not carry the standard solution sample, directly measure, reaction velocity is fast.2 adopt latest type LCD, and integrated circuit (IC)-components, have the direct Presentation Function of screen, and tool is low in energy consumption.3 instrument volumes are little, and (less than 15kg) in light weight, simple to operate, the precision height is easy to carry, and is suitable for open-air power free local the use.

Further specify below in conjunction with drawings and Examples

Fig. 1 is the utility model structure block diagram

(1) ion-selective electrode (2) compound operation multiplying arrangement (3) analog-digital commutator (4) I/O interface, (5) computer processor (6) LCD (7) keyboard matrix device (8) electric supply installation (9) storage facility (10) printer

Fig. 2 (A) Fig. 2 (B) is the utility model circuit theory diagrams

Among Fig. 1, the analogue amplifier that compound operation multiplying arrangement (2) is made of ic chip L7650 and integrated package OP07, after the electric signal amplification of gathering, flow to analog-digital commutator (3), analog-digital commutator constitutes four and half A/D transducers by ic chip L7135 and accessory circuit, outputs to the I/O interface with binary-coded decimal.The I/O interface is finished by integrated package 81C55 parallel interface sheet.Its A mouth, the C mouth connects the A/D transducer, is used for input digit amount and strong attitude word.The B mouth is used for external mini-printer, its inside 256 byte RAM are used to expand the external data memory, its 14 figure place counters are used for providing the A/D converter work clock to system clock behind frequency division, computer processor (5) is finished by 80C31, LCD (6) is made up of DMC16101A type LCD, is 16 5 * 7 dot character display modes of single file.The keyboard matrix device is made up of 82C79 and 4 * 5 key matrixes, is the parts of carrying out function key order and data parameters input.The B mouth of the 81C55 of printout I/O interface connects the PP40 printer to be finished, and also can connect other printers.External program storage (9) is made up of 27C128 and 741+C373, and system software has 10KB approximately.In the electric supply installation (8), direct current component is made up of four joint ickel-cadmium cells, and AC portion is made up of the D.C. regulated power supply of 5V output.The AC and DC electricity is controlled by change-over switch K, but all through DC/DC transducer generation ± 5V voltage, has floating empty buffer action simultaneously.

Claims (1)

1. A kind of by different kinds of ions selection electrode and corresponding weak electric signal amplifying circuit, analog to digital conversion circuit, 51 serial single chip microcomputer and interface circuits, display circuit, keyboard matrix circuit, the smart water quality fluorine ion analyzer that micro-printer output circuit and power supply are formed, it is characterized in that: one constitutes high input impedance by ion-selective electrode and compound operation multiplying arrangement, high stable, the analogue amplifier of low drift, to input to the analog-digital commutator that constitutes by four and half A/D transducers after the weak electric signal amplification of gathering, output to the I/O interface that constitutes by the 81C55 parallel interface with binary-coded decimal again, the A mouth of I/O interface, the C mouth is connected with the A/D transducer, be used to import digital quantity and status word through the A/D conversion, the B mouth is used to connect mini-printer, the I/O interface links to each other with center control device computer processor by bus, computer processor is finished whole intelligent control and treatment by software, and by connected liquid crystal indicator display result.

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