CN202330403U

CN202330403U - Intelligent water quality monitoring system

Info

Publication number: CN202330403U
Application number: CN2011204912291U
Authority: CN
Inventors: 岳亚杰; 于瑞丰; 杨莉; 沙晨明; 张晓晶
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2011-12-01
Filing date: 2011-12-01
Publication date: 2012-07-11
Anticipated expiration: 2021-12-01

Abstract

An intelligent water quality monitoring system mainly aims to solve the problem that a conventional water quality monitoring device is not accurate enough in measurement result, is bad in stability and high in power consumption. The intelligent water quality monitoring system is characterized by further comprising a pH compound glass electrode, a 499ADO dissolved oxygen sensor, a CA3140 operational amplifier, an AD0832 A/D (Analog/Digital) converter, and an LCD, wherein the signal input ends of the pH compound glass electrode and the 499ADO dissolved oxygen sensor are respectively connected to the signal input end of the corresponding CA3140 operational amplifier; the magnifying signals output by the CA3140 operational amplifier are input into two different water quality sampled signal input ends of a singlechip after being converted into digital signals through the ADC0832 A/D converter; and the singlechip outputs control signals to the LCD, a scanning drive circuit and a warning circuit through corresponding ports. The intelligent water quality monitoring system can measure the parameters, such as pH value, dissolved oxygen content and the like, of a detected target, and has the advantages of accurate measurement result, low power consumption, and low cost.

Description

The smart water quality monitoring system

Technical field

The utility model relates to a kind of control device that is used for water quality monitoring.Specifically, relate to a kind of intelligent water quality detecting device that can be used in aspects such as daily water consumption, water factory's breed.

Background technology

Along with social economy and science and technology development, people's living standard also improves constantly, and causes the aggravation of water load, because science and technology constantly develops, and industry is rapidly progressive, quantity of wastewater effluent continues to increase again.The physical environment that this not only has influence on our existence also threatens human safety of drinking water property, and therefore, water quality monitored becomes the important major issue that concerns national security.The content of water quality monitoring not only should comprise process water and industrial water drainage, to the detection of source qualities such as rivers,lakes and seas, also should spread to domestic water, the water quality monitoring of potable water.At present, for the monitoring of water quality, taked various monitoring measures both at home and abroad; But these monitoring meanss or cost are high, or too simply cause out of true as a result; Inefficiency, therefore, it is low and detect effective technological means need to seek a kind of production cost.

Summary of the invention

In order to solve the prior art problem that provides in the background technology; The utility model provides a kind of smart water quality monitoring system; The electronic component that this kind smart water quality monitoring system is selected for use is cheap, so purchase cost is low, and has the characteristics of short, highly sensitive, good test effect of response time; Can also work out the program in the single-chip microcomputer, its function is fully developed.

The technical scheme of the utility model is: this kind smart water quality monitoring system; Comprise single-chip microcomputer, it is characterized in that: said system also comprises a PH compound glass electrode, a 499ADO dissolved oxygen amount sensor, two CA3140 operational amplifiers, two ADC0832A/D converters and a LCD LCDs; Wherein, The signal input part of said PH compound glass electrode and 499ADO dissolved oxygen amount sensor is connected to the signal input part of corresponding CA3140 operational amplifier respectively, and the amplifying signal of said CA3140 operational amplifier output converts 2 different water quality sampling signal input parts of the said single-chip microcomputer of input after the digital signal to through the ADC0832A/D converter; Said single-chip microcomputer is exported control signal to said LCD display, scan drive circuit and warning circuit respectively through corresponding port.

Described SCM Based smart water quality monitoring system is selected the AT89C52 controller for use.

The utlity model has following beneficial effect: this kind smart water quality monitoring system is a main control chip with the STC89C52 single-chip microcomputer; Measuring the water body mass fraction is made up of pH sensor, dissolved oxygen amount sensor and A/D converter; Add display unit, this water monitoring device had that function is many, the ratio of performance to price is high, low in energy consumption, system design is simple, directly perceived, characteristics such as speed is fast, measure accurately, automaticity height easy to use.Through setting the program in the single-chip microcomputer; Can realize the automatic range conversion; Remote control, standard output interface and numeral show that cleaning, state self check and warning function are done running and power-off protection automatically; Incoming call recovers automatically, can realize the automatic demarcation calibration function that COD, ammonia nitrogen, TOC, total phosphorus, total nitrogen project are detected.

Description of drawings:

Fig. 1 is the composition structural representation of the utility model.

Fig. 2 is the electrical schematic diagram of the said operational amplifier of the utility model.

Embodiment:

Below in conjunction with accompanying drawing the utility model is described further:

By shown in Figure 1; This kind smart water quality monitoring system; Comprise single-chip microcomputer, its unique distinction is: said system also comprises a PH compound glass electrode, a 499ADO dissolved oxygen amount sensor, two CA3140 operational amplifiers, two ADC0832A/D converters and a LCD LCDs; Wherein, The signal input part of said PH compound glass electrode and 499ADO dissolved oxygen amount sensor is connected to the signal input part of corresponding CA3140 operational amplifier respectively, and the amplifying signal of said CA3140 operational amplifier output converts 2 different water quality sampling signal input parts of the said single-chip microcomputer of input after the digital signal to through the ADC0832A/D converter; Said single-chip microcomputer is exported control signal to said LCD display, scan drive circuit and warning circuit respectively through corresponding port.Said single-chip microcomputer is selected the AT89C52 controller for use.

During practical implementation, as indicator electrode, silver chloride electrode constitutes the compound glass electrode as contrast electrode with two kinds of electrode package to pH compound glass electrode sensor together with glass electrode.Electrode is inserted solution to be measured, compound glass electrode and solution composition primary element to be measured, two output leads of compound glass electrode are respectively the positive pole and the negative pole of primary element.

The 499ADO sensor of selecting for use is mainly used in the content of dissolved oxygen DO in the continuous detecting liquid, and measurement range is 0-20ppm, is mainly used in the aeration tank of municipal wastewater and industrial sewage treatment plant, also can be used for detecting the content of culturing the pond dissolved oxygen DO.The 499ADO sensor is made up of golden negative electrode, silver-colored order positive electrode and electrolytic solution, is covered with the barrier film that one deck allows the oxygen infiltration on the negative electrode.During the working sensor, the oxygen molecule in the fluid to be measured diffuses on the negative electrode through barrier film, and the polarizing voltage that is applied on the negative electrode is reduced into hydroxide ion with oxygen molecule, and then between the yin, yang electrode, produces electric current.Because oxygen molecule depends on the temperature of fluid to be measured through the rate of diffusion of barrier film, so, the sensor's response time must Tc to the influence of membrane permeate property.Can built-in Pt100 temp probe in the dissolved oxygen sensor, therefore, timing signal; Sensor is exposed in the saturated air, by the associated button on the analytical instrument, at this moment; Analytical instrument is measured atmospheric pressure, and calculates under Current Temperatures, pressure the equilibrium concentration of oxygen in the atmosphere.The maintenance of this sensor is also very convenient, fast.The replacing of barrier film need not used specific purpose tool or other fixed equipment, only needs several electrolytic solution of point in diaphragm assembly, places it in then on the negative electrode, twists to revolve fixator and put in place and get final product.During filling electrolyte, sensing station is inverted, the barrier film position upwards; A what sensors sides of outwarding winding is the blocking solution plug of side on the lower side, and dielectric plastic bottle is equipped with in extruding then, drips electrolytic solution at leisure from filling opening; The low filling opening below that reaches of straight solution stopping face resets the blocking solution plug and screws, then; Sensing station is recovered normal, and promptly barrier film and pinches its top down with right finger; Firmly with its laterally whipping make to charge into electrolyte and link to each other with the dissolved oxygen diaphragm assembly fully several times, remove the centre and possibly have bubble.There are several ways to install the sensor choice for Loss on drying gas pool or pond measurement applications, select immersive installation; measurement applications for pipelines, flow-through installation options.The 499ADO sensor also can be joined VP cable splice and a private cable, promptly divides body structure.The male joint of VP that joins with sensor, can with cable Fast Installation, dismounting that the VP Female connector is housed.In case the wiring of cable and analytical instrument is accomplished, then after more during emat sensor, need not to change cable, need not rewiring, and during sensor installation, cable the twisting phenomenon can not appear yet.

The minimum system of STC89C52 single-chip microcomputer is made up of clock circuit, reset circuit, power circuit and single-chip microcomputer.The clock signal of single-chip microcomputer is used to provide the time reference of various operations in the single-chip microcomputer sheet, and reset operation then makes the on-chip circuit initialization of single-chip microcomputer, and single-chip microcomputer is brought into operation from a kind of definite initial state.The clock signal of single-chip microcomputer obtains with two kinds of circuit forms usually: internal oscillator mode and outside mode of oscillation.At pin XTAL1 and external crystal oscillator of XTAL2 or ceramic resonator, just constituted the internal oscillator mode.Because there is a high-gain inverting amplifier single-chip microcomputer inside, behind external crystal oscillator, has just constituted self-excited oscillator and has produced the running clock pulse.When 51 single-chip microcomputers ^[10]Reset pin RST 2 machine cycles appear during above high level, single-chip microcomputer is just carried out reset operation.If RST is continuously high level, single-chip microcomputer just is in the cycle reset state.According to the requirement of using, reset operation has two kinds of citation forms usually: electrification reset with power on or switch resets.Electrification reset is realized reset operation automatically, and at the single-chip microcomputer run duration, with switching manipulation single-chip microcomputer resetted after requiring energized.The reset operation of single-chip microcomputer makes single-chip microcomputer get into init state, and comprising making programmable counter PC=0000H, this shows that program begins to carry out from the 0000H address location.

System reset is the first step that any microsystem is carried out, and the The whole control chip is got back under the hardware state of acquiescence.Resetting of 51 series monolithics controlled by the RESET pin; This pin and high level join above after 24 oscillation period, and 51 single-chip microcomputers promptly get into the chip internal reset mode, and under this state, wait for always; After the RESET pin transfers low level to; Check that just the EA pin is high level or low level, if high level is then carried out the program code of chip internal, if low level just can be carried out external program.

Claims

1. smart water quality monitoring system; Comprise single-chip microcomputer, it is characterized in that: said system also comprises a PH compound glass electrode, a 499ADO dissolved oxygen amount sensor, two CA3140 operational amplifiers, two ADC0832A/D converters and a LCD LCDs; Wherein, The signal input part of said PH compound glass electrode and 499ADO dissolved oxygen amount sensor is connected to the signal input part of corresponding CA3140 operational amplifier respectively, and the amplifying signal of said CA3140 operational amplifier output converts 2 different water quality sampling signal input parts of the said single-chip microcomputer of input after the digital signal to through the ADC0832A/D converter; Said single-chip microcomputer is exported control signal to said LCD display, scan drive circuit and warning circuit respectively through corresponding port.

2. SCM Based smart water quality monitoring system according to claim 1, it is characterized in that: said single-chip microcomputer is selected the AT89C52 controller for use.