CN103575784A - Design method of water hardness detection circuit - Google Patents
Design method of water hardness detection circuit Download PDFInfo
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- CN103575784A CN103575784A CN201210278370.2A CN201210278370A CN103575784A CN 103575784 A CN103575784 A CN 103575784A CN 201210278370 A CN201210278370 A CN 201210278370A CN 103575784 A CN103575784 A CN 103575784A
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Abstract
The invention relates to a design method of a water hardness detection circuit, which is characterized in that a processing (7) comprises two emitter followers composed of two operational amplifiers, and two measuring amplifiers composed of three operational amplifiers; a calomel electrode (3) and a calcium electrode (2) respectively electrically connected to input ends of the two emitter followers; and output ends of the two emitter followers are electrically connected with the two measuring amplifiers. The circuit can implement automatic and continuous detection on the hardness of boiler feed water and overproof warning, is simple to operate, and has the advantages of high working stability and reliability and the like.
Description
Technical field
The invention belongs to a kind of detection pick-up unit, particularly a kind of method for designing of water hardness testing circuit.
Background technology
In nature water, contain a large amount of calcium ions and magnesium ions, boiler is directly used with the former water of calcium ions and magnesium ions, will make gyp, has a strong impact on boiler safety, economical operation, and therefore, Industrial Boiler water must be processed through softening.According to the relevant regulations of national labour protection department; the hardness of boiler feed water must not be higher than corresponding hardness number, and traditional employing chemical method detects the water hardness of water inlet, and its shortcoming is to chemically examine by timing sampling; can not be real-time; continuous detecting, can not show in time to the unexpected variation of water quality, and; this method detection speed is slow; chemical reagent consumption expense is high, thereby, be difficult to guarantee for a long time that boiler feed water hardness reaches the hardness number of national labour protection department regulation.
Summary of the invention
The object of this invention is to provide a kind of can detection boiler feed water hardness Automatic continuous, the warning that exceeds standard, and method for designing simple to operate, the reliable water hardness testing circuit of working stability.
The object of the present invention is achieved like this, the method for designing of water hardness testing circuit, it is characterized in that: treatment circuit comprises two-way emitter follower, two-way emitter follower consists of two amplifiers, two-way measuring amplifier, two-way measuring amplifier is comprised of three amplifiers, and mercurous chloride electrode and calcium electrode are electrically connected to respectively the input end of two-way emitter follower, and the output terminal of two-way emitter follower is electrically connected to two-way measuring amplifier.
The described output terminal of two-way emitter follower and the input of comparer are electrically connected to, and comparer output is electrically connected to warning circuit.
Described two-way measuring amplifier is electrically connected to the single-chip microcomputer input port with A/D conversion, and single-chip microcomputer one I/O is electrically connected to warning circuit.
Described treatment circuit is electrically connected with LCD display and keyboard circuit.
Described mercurous chloride electrode and calcium electrode respectively one end stretch in detected liquid cell, and the other end is electrically connected to treatment circuit, and housing one side has detection water inlet, and opposite side has detection water out, and detected liquid cell is detecting water inlet and detecting between water out.
Advantage of the present invention is: owing to adopting electrochemical method, can detect boiler feed water hardness Automatic continuous, warning exceeds standard, working stability simple to operate is reliable, thereby improved accuracy of detection, reduced boiler operatiopn expense, alleviated personnel labor intensity, guaranteed that boiler feed water hardness can not surpass the hardness number of regulation.
Accompanying drawing explanation
Below in conjunction with embodiment accompanying drawing, the invention will be further described:
Fig. 1 is embodiment of the present invention structural representation;
Fig. 2 is embodiment 1 circuit theory diagrams;
Fig. 3 is embodiment 2 circuit theory diagrams.
In figure, 1, housing; 2, calcium electrode; 3, mercurous chloride electrode; 4, detect water out; 5, detected liquid cell; 6, detect water inlet; 7, treatment circuit; 8, keyboard circuit; 9, warning circuit; 10, LCD display.
Embodiment
As shown in Figure 1, at least comprise housing 1, housing 1 one sides have the water inlet 6 of detection, opposite side has the water out 4 of detection, detect water inlet 6 and detect water out 4 that this has detected liquid cell 5, mercurous chloride electrode 3 and calcium electrode 2 respectively one end stretch in detected liquid cell 5, and the other end is electrically connected to treatment circuit 7.
As shown in Figure 2, treatment circuit 7 comprises two-way emitter follower IC1 and IC2, two-way emitter follower consists of two amplifiers, two-way measuring amplifier IC3 and IC4, two-way measuring amplifier is comprised of three amplifiers, mercurous chloride electrode 3 and calcium electrode 2 are electrically connected to respectively the input end of two-way emitter follower IC1 and IC2, and the output terminal of two-way emitter follower IC1 and IC2 is electrically connected to the input of comparer IC5, and comparer output is electrically connected to warning circuit 9.
As shown in Figure 1, at least comprise housing 1, housing 1 one sides have the water inlet 6 of detection, opposite side has the water out 4 of detection, detect water inlet 6 and detect water out 4 that this has detected liquid cell 5, mercurous chloride electrode 3 and calcium electrode 2 respectively one end stretch in detected liquid cell 5, and the other end is electrically connected to treatment circuit 7.
As shown in Figure 3, treatment circuit 7 comprises two-way emitter follower IC1 and IC2, two-way emitter follower consists of two amplifiers, two-way measuring amplifier IC3 and IC4, two-way measuring amplifier is comprised of three amplifiers, mercurous chloride electrode 3 and calcium electrode 2 are electrically connected to respectively the input end of two-way emitter follower IC1 and IC2, and the output terminal of two-way emitter follower IC1 and IC2 is electrically connected to the single-chip microcomputer input port with A/D conversion, and single-chip microcomputer one I/O is electrically connected to warning circuit 9.Treatment circuit 7 is electrically connected with LCD display 10 and keyboard circuit 8, by LCD display and keyboard circuit input water hardness warning upper lower limit value, by LCD display, shows flow, temperature, water hardness value.
Single-chip microcomputer with A/D conversion is mas430.
Principle of the present invention is: the ability of water hardness refer initially to calcium, magnesium ion precipitation soap.The total hardness of water refers to the total concentration of calcium in water, magnesium ion, comprising carbonate hardness (calcium precipitating with carbonate form by heating energy, magnesium ion, therefore be again temporary hardness) and non-carbonate hardness (part calcium, the magnesium ion that can not precipitate after heating, claim again Permanent hardness).Generally calcium ion is maximum to the contribution of total hardness, and for relatively-stationary a certain area, the shared ratio of calcium ions and magnesium ions is again relatively stable, so, detect calcium ion concentration, just indirectly shown the total hardness of local water quality.
Calcium electrode is as detecting electrode, and mercurous chloride electrode is as contrast electrode, and calcium electrode, mercurous chloride electrode form primary element with detected boiler feed water.
The electromotive force of primary element is relevant to the calcium ion concentration in tested water, the small electric kinetic potential of primary element is amplified, then compare with inner reference voltage Ef, if illustrating into water hardness, the small electric kinetic potential Ex> reference voltage Ef of primary element exceeds standard, instrument is reported to the police, otherwise does not report to the police.Before the use first of calcium electrode, according to the request for utilization of electrode, need to add in 0.1 mole of lime chloride and fill solution (instrument is with), then invade bubble and in water to be detected, activate 24 hours.Calcium electrode belongs to exact instrument, and the PVC film of electrode front end has ion and selects permeation, can not use hard object contact, in order to avoid damage.The high impedance plug of calcium electrode lead-in wire, answers the socket bottom at the inserting instrument back side, and then tightening fixed screw can use.
Mercurous chloride electrode needs to add saturated Klorvess Liquid in mercurous chloride electrode after using continuously a period of time, and need to maintain the potassium chloride of separating out on a small quantity, and calcium electrode is used the time about 2 months continuously, also will add 0.1 mole of calcium chloride solution.Note, in mercurous chloride electrode, can not have bubble, in order to avoid " salt bridge " opens circuit.
The parts that the present embodiment does not describe in detail and structure belong to well-known components and common structure or the conventional means of the industry, here not narration one by one.
Claims (5)
1. the method for designing of water hardness testing circuit, it is characterized in that: treatment circuit (7) comprises two-way emitter follower, two-way emitter follower consists of two amplifiers, two-way measuring amplifier, two-way measuring amplifier is comprised of three amplifiers, mercurous chloride electrode (3) and calcium electrode (2) are electrically connected to respectively the input end of two-way emitter follower, and the output terminal of two-way emitter follower is electrically connected to two-way measuring amplifier.
2. the method for designing of water hardness testing circuit according to claim 1, is characterized in that: the described output terminal of two-way emitter follower and the input of comparer are electrically connected to, and comparer output is connected with warning circuit electricity (9).
3. the method for designing of water hardness testing circuit according to claim 1, is characterized in that: described two-way measuring amplifier is electrically connected to the single-chip microcomputer input port with A/D conversion, and single-chip microcomputer one I/O is electrically connected to warning circuit (9).
4. the method for designing of water hardness testing circuit according to claim 1, is characterized in that: described treatment circuit (7) is electrically connected with LCD display (10) and keyboard circuit (8).
5. the method for designing of water hardness testing circuit according to claim 1, it is characterized in that: described mercurous chloride electrode (3) and calcium electrode (2) respectively one end stretch in detected liquid cell (5), the other end is electrically connected to treatment circuit (7), housing (1) one side has detection water inlet (6), opposite side has detection water out (4), and detected liquid cell (5) is detecting water inlet (6) and detecting between water out (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210278370.2A CN103575784A (en) | 2012-08-07 | 2012-08-07 | Design method of water hardness detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210278370.2A CN103575784A (en) | 2012-08-07 | 2012-08-07 | Design method of water hardness detection circuit |
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| CN103575784A true CN103575784A (en) | 2014-02-12 |
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| CN201210278370.2A Pending CN103575784A (en) | 2012-08-07 | 2012-08-07 | Design method of water hardness detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116022A (en) * | 2015-09-22 | 2015-12-02 | 成都乐维斯科技有限公司 | Water quality detection circuit designed on basis of single supply quadri-operational amplifier |
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2012
- 2012-08-07 CN CN201210278370.2A patent/CN103575784A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116022A (en) * | 2015-09-22 | 2015-12-02 | 成都乐维斯科技有限公司 | Water quality detection circuit designed on basis of single supply quadri-operational amplifier |
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Application publication date: 20140212 |