CN104977322A - Single-path seven-electrode conductivity detection monitor - Google Patents
Single-path seven-electrode conductivity detection monitor Download PDFInfo
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Abstract
The invention discloses a single-path seven-electrode conductivity detection monitor which is combined with a seven-electrode or four-electrode conductivity sensor to realize detection and control of the conductivity of an industrial field. Gear precision alternating-current constant-current excitation is adopted, a measurement range is 20uS/cm-200mS/cm and the relative precision of a detection point is 1%; and conductive electrodes with different electrode constants are matched so that a measurement range can be further expanded. An industrial standard liquid crystal touch screen is adopted, and configuration software of the screen and software of a single chip microcomputer are matched to carry out data communication so that input and output of data are realized; the system has an operation calibration picture, and has real-time curve recording, historical curve inquiry, current alarming display and historical alarming display functions; and furthermore, the system also has manual/automatic control switching, manual pump switching-on/off conversion, CAN communication indication and system alarming display functions. The single-path seven-electrode conductivity detection monitor has low manufacturing cost, simple process, high measurement precision, strong anti-interference capability, a plurality of functions and convenience for repairing and maintaining.
Description
Technical field
The invention belongs to chemical process parameter on-line checkingi field, relate to online indirect detection and the control of industry spot conducting solution concentration, special and aluminium shape surface process Zhong Ge workshop section conductivity detects with Adding medicine control closely related, is specifically related to a kind of single channel seven-electrode conductivity test and monitoring instrument.
Background technology
In chemical reaction process, conductivity is an important parameter of solution, and its size directly reflects the conductive capability of solution, and closely related with electrolytical concentration; These carry out the occasion of other parameter detecting using conductivity as intermediate variable, all need a kind of stable, accurate conductivity detector; At present, in aluminium shape surface processing procedure, because site environment is severe, solution corrosion is extremely strong, possibility incrustation, need to do periodic maintenance, only have the instrument of external Ji Jia manufacturer to be installed on domestic production scene, and the electric conductivity detector that domestic manufacturer produces almost does not have; Therefore, a set of test and monitoring instrument supporting with seven electrode sensors must be designed, can anticorrosion again can anti-tartar; And mostly expensive from the equipment of external import, maintenance maintenance is difficult.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art and deficiency, a kind of single channel seven-electrode conductivity test and monitoring instrument is provided, power unit adopts wave filter and solid capacitor to strengthen, simulation part all adopts thousand-island forest park measuring resistance to exchange operational amplifier with precision, all signal grounds all pass through safety electric capacity connected with outer casing ground connection again, therefore have stronger antijamming capability, owing to adopting, point gear is accurate exchanges constant current drive, has certain anti-electrode incrustation ability; Adopt high resistant instrument amplifier to gather signal, can either common mode interference be resisted, also can resist certain electrode incrustation; Circuit structure has also done simplification further, selection standard industry control liquid crystal touch screen carries out showing to data and operates, be convenient to carry out exchanges data with standard device, therefore, the present invention has that measuring accuracy is high, reliability is high, function is many, cost is low, intelligence degree is high, it is easy to maintenance to manufacture, can with the advantages such as miscellaneous equipment networking, the present invention not only can connect seven-electrode conductivity sensor, also can connect the conductivity sensor of four electrodes; Range is provided with four gears, directly can measure the conductivity of 20uS/cm ~ 200mS/cm scope, coordinates the electrode of various conductance constant can do further expansion to range ability; The excitation frequency of conductivity meter is adjustable, fixes tentatively as high all 1100Hz.
Object of the present invention is achieved through the following technical solutions:
A kind of single channel seven-electrode conductivity test and monitoring instrument, the display of its liquid crystal touch screen data manipulates as shown in Figure 1 with input, liquid crystal touch screen is configured with CAN address display window 1, temperature display device 2, standard conductivity display window 3, current alerts button 4, real-time curve button 5, operation calibration frames button 6, history curve button 7, history alarm button 8, help button 9, switch pump instruction display window 10, auto-manual switching push button 11, system alarm state display window to change 12, CAN communication state display window to change 13, manual on/off switch button 14 mutual association composition; Liquid crystal touch screen is powered by external DC24V, and interface is connected with the corresponding point on motherboard by stub cable.
As shown in Figure 2, the circuit of described motherboard by first at sheet circuit system 15, mainboard digital power 16, safety electric capacity one circuit 17, mainboard analog power 18, at sheet system power supply and reset circuit 19, simulating signal limiter protection circuit 20, CAN isolated drive circuit 21, switch output control circuit 22, built-in function circuit 23, liquid crystal touch screen I/O communication interface circuit 24, display board communication interface circuit 25, temperature detection interface 26, temperature becomes send buffer circuit 27, conductance trip stop transmission circuit 28, conductance measurement turns direct current and buffer circuit 29 with exchanging, Conductivity detection interface 30, constant current signal driving circuit 31, exiting signal generating circuit 32, precision voltage source circuit 33, conductance isolation analog power 34, safety electric capacity two circuit 35 common electrical connects to form,
As shown in Figure 3, in motherboard circuits of the present invention, first is connected and composed by integrated circuit U1, crystal oscillator U2, connector J1, resistance R1, electric capacity C1 ~ C22 common electrical at sheet circuit system 15; As shown in Figure 4, connected and composed by voltage stabilizer U3 and U4, connector J2, diode D1 ~ D4 and D6 ~ D7, light emitting diode D5 and D8, resistance R2 ~ R5, electric capacity C23 ~ C29, button S1 common electrical at sheet system power supply and reset circuit 19; As shown in Figure 5, simulating signal limiter protection circuit 20 is connected and composed by amplifier U6 and U8, voltage stabilizing chip U5, limited amplitude protection chip U7, resistance RX1 ~ RX9 and R6, electric capacity C30 ~ C35 and CX1, light emitting diode L1 common electrical; As shown in Figure 6, mainboard digital power 16 is connected to form by connector DC1 and outside connected switch power supply, wave filter U9, electric capacity C36 and C37 common electrical; Safety electric capacity one circuit 17 is connected to form by magnetic bead RL1, resistance R7, safety electric capacity C38 common electrical; Mainboard analog power 18 is connected to form by connector DC2 and outside connected switch power supply, wave filter U10 and U11, electric capacity C39 ~ C42 common electrical; As shown in Figure 7, switch output control circuit 22 is connected to form by relay U13, connector J5, triode N1, diode D9, resistance R15, electric capacity C44 common electrical, and wherein J5 provides switch control rule to export, and dial-up NBJ1 can forbid that it exports; Built-in function circuit 23 is connected to form by toggle switch NBJ1 and NBJ2, exclusion R14 common electrical, and NBJ1 is monitoring dial-up, and NBJ2 is CAN geocoding; Liquid crystal touch screen I/O communication interface circuit 24 is connected to form by integrated circuit U12, connector P1 and J4, resistance R10 ~ R13, magnetic bead RL2, electric capacity C43 common electrical, and wherein, P1 connects liquid crystal touch screen; Display board communication interface circuit 25 is connected to form by connector J3, resistance R8 ~ R9 common electrical, for subsequent use; As shown in Figure 8, CAN isolated drive circuit 21 is connected to form by integrated circuit U14, connector CAN1, resistance R16 ~ R17, electric capacity C45 common electrical, wherein, and the external CAN of CAN1; As shown in Figure 9, temperature detection interface 26 is made up of connector JT1, external semiconductor temperature sensor; Temperature becomes send buffer circuit 27 to be connected and composed by amplifier U16, signal isolator U15, resistance R18 ~ R20, electric capacity C46 ~ C55 common electrical; As shown in Figure 10, conductance measurement turns direct current and buffer circuit 29 is connected and composed by amplifier U17 and U20 ~ U21 and U24, AC/DC signal converter U19 and U22, signal isolator U18 and U23, resistance R21 ~ R25, electric capacity C56 ~ C75 common electrical with exchanging; Conductivity detection interface 30 is made up of connector JD1, external seven-electrode conductivity sensor; As shown in figure 11, conductance trip stop transmission circuit 28 is connected and composed by relay U25 ~ U29, triode N2 ~ N6, diode D10 ~ D14, resistance R26 ~ R31 common electrical; Constant current signal driving circuit 31 is connected and composed by amplifier U31 ~ U33, resistance RX10 ~ RX14 and RA1 ~ RA13, electric capacity C76 ~ C79 and C83 ~ C89 common electrical; Exiting signal generating circuit 32 is connected and composed by integrated circuit U30, resistance RIN1 and R32, electric capacity C80 ~ C81 and C82 and CF1 common electrical; As shown in figure 12, precision voltage source circuit 33 is connected and composed by voltage stabilizer U36 ~ U37, inductance L 2 ~ L5, electric capacity C94 ~ C97 and C99 ~ C100 common electrical; Conductance isolation analog power 34 is connected and composed by connector DC3 and outside connected switch power supply, wave filter U34 ~ U35, electric capacity C90 ~ C93 common electrical; Safety electric capacity two circuit 35 is connected and composed by resistance R33, magnetic bead RL3, safety electric capacity C98 common electrical;
Motherboard of the present invention, external 3 Switching Power Supplies are isolated corresponding point on analog power 34 by power lead and mainboard digital power 16, mainboard analog power 18, conductance and are connected; Mainboard digital power 16 by power lead respectively with safety electric capacity one circuit 17, on sheet system power supply and reset circuit 19, CAN isolated drive circuit 21, switch output control circuit 22, built-in function circuit 23, liquid crystal touch screen I/O communication interface circuit 24, display board communication interface circuit 25, conductance trip stop transmission circuit 28, corresponding point are connected; Also be connected in sheet circuit system 15, mainboard digital power 16, mainboard analog power 18, simulating signal limiter protection circuit 20 corresponding point with first respectively with digital power line by analog power line, for the system core provides analog power and the digital power of high-quality at sheet system power supply and reset circuit 19; Conductance isolation analog power 34 is become with temperature detection interface 26, temperature respectively by analog power line and send buffer circuit 27, conductance measurement to turn corresponding point on direct current and buffer circuit 29, constant current signal driving circuit 31, precision voltage source circuit 33, safety electric capacity two circuit 35 and be connected with exchanging, and first is connected with CAN isolated drive circuit 21, liquid crystal touch screen I/O communication interface circuit 24, display board communication interface circuit 25 corresponding point by data communication line respectively at sheet circuit system 15; First is connected with simulating signal limiter protection circuit 20 by analog signal line at sheet circuit system 15, first is connected with switch output control circuit 22, built-in function circuit 23, conductance trip stop transmission circuit 28 by switch signal line at sheet circuit system 15, and first is also connected with at sheet system power supply and reset circuit 19 by reset line at sheet circuit system 15;
Exiting signal generating circuit 32 of the present invention is connected with precision voltage source circuit 33 corresponding point by power lead; Constant current signal driving circuit 31 is connected with conductance trip stop transmission circuit 28, exiting signal generating circuit 32, Conductivity detection interface 30 corresponding point respectively by signal wire; Conductance measurement turns direct current and buffer circuit 29 is connected with simulating signal limiter protection circuit 20, Conductivity detection interface 30 corresponding point respectively by signal wire with exchanging; Temperature becomes send buffer circuit 27 to be connected with temperature detection interface 26, simulating signal limiter protection circuit 20 corresponding point respectively by signal wire; Temperature detection interface 26 is by the external semiconductor temperature sensor of shielded cable; Conductivity detection interface 30 is by the external seven-electrode conductivity sensor of shielded cable.
Action button of the present invention comprises current alerts button 4, the defeated button of real-time curve 5, operation calibration frames button 6, history curve button 7, history alarm button 8, help button 9, automatic/hand switching push button 11, manual on/off switch button 14; Described display window comprises CAN address display window 1, temperature display device 2, standard conductivity display window 3, switch pump instruction display window 10, system alarm state display window to change 12, CAN communication state display window to change 13.
The present invention has following advantage and effect relative to prior art:
(1) antijamming capability is strong, and AC power is connected to twin-stage wave filter, and direct-current switch power supply is connected to DC filter and uses solid capacitor in a large number, and some places also adopt second level analog power to power, thus ensures the quality of direct current supply; System carries out ground connection by safety electric capacity, effectively can eliminate and disturbs and ensure safety.
(2) measuring accuracy is high, and adopt precision optical machinery relay, its contact resistance is very little; Alternating constant exciting circuit can eliminate the impact of the additional resistance that electrode surface dirt produces effectively; Signal input adopts the instrument amplifier of high input impedance, can eliminate the impact of the additional resistance that dirt produces, can eliminate common mode interference widely again; Simulation part all have employed the resistance of high frequency low drifting precision amplifier and thousand-island forest park, thus ensure that input becomes the precision sent.
(3) compatibility is good, function is many, by using industrial standard liquid crystal touch screen to carry out connecting communication, thus makes data display, input, warning, curve record, inquiry etc. become easy; The use of fault-tolerant CAN communication isolation drive module, conveniently carries out communication with DCS or other system with CAN and corresponding agreement.
(4) functional reliability is high, adopt comprehensive Anti-Jamming Technique, adopt fault-tolerant technique, fault only appears in this module, and other no failure part is work as usual, as communication isolation drive module break down time, overall measurement part is work as usual, and each road of potential electrode part is independent, and be added with protection circuit, the fault on a few road can not have influence on other road; Using the mean value of high alarm setting and low alarm limit as controlling definite value, carry out the control of ON/OFF amount and make it not transfinite, control effects is good.
(5) easy to operate, internal control is completed by technician, peripheral operation is regularly adjusted by workman, and operator, according to process conditions, alerting signal and recording curve, adjusts conductivity warning upper and lower limit in time and makes periodic cleaning to electrode.
(6) intelligence degree is high, and inner parameter has default value, is adjusted in internal control by technician, has multinomial warning function, is convenient to help the reason of failure judgement and the position at place.
(7) between circuit board of the present invention, available simple connector or stub cable connect, manufacture, easy to maintenance, cost is low, adopts aluminium cabinet, complete machine radiating condition is good, cabinet is hermetically sealed, can exempt dust, moisture invades, and adopts industrial standard liquid crystal touch screen, and utilize the configuration software that this liquid crystal touch screen is furnished with, powerful function can be realized, good looking appearance, easy to operate; Anti-deadlock function, the every place having circulation also may cause deadlock of native system program, inner counter, over range is jumped out automatically, and system design margin is comparatively large, normally can work in 220V ± 30% scope.
Accompanying drawing explanation
Fig. 1 is the contour structures schematic diagram of test and monitoring instrument of the present invention;
Fig. 2 is the motherboard circuits structural representation of test and monitoring instrument of the present invention;
Fig. 3 is first of test and monitoring instrument of the present invention at sheet circuit system schematic diagram;
Fig. 4 is at sheet system power supply and reset circuit schematic diagram in the motherboard circuits of test and monitoring instrument of the present invention;
Fig. 5 is the simulating signal limiter protection circuit schematic diagram in the motherboard circuits of test and monitoring instrument of the present invention;
Fig. 6 is mainboard digital power, safety condenser network one, mainboard analog power schematic diagram in the motherboard circuits of test and monitoring instrument of the present invention;
Fig. 7 is the schematic diagram of switch output control circuit in the motherboard circuits of test and monitoring instrument of the present invention, built-in function circuit, liquid crystal touch screen I/O communication interface circuit, display board communication interface circuit;
Fig. 8 is the schematic diagram of the CAN isolated drive circuit in the motherboard circuits of test and monitoring instrument of the present invention;
Fig. 9 is temperature detection interface in the motherboard circuits of detection alarm instrument of the present invention, temperature becomes the schematic diagram sending buffer circuit;
Figure 10 is conductance measurement in the motherboard circuits of detection alarm instrument of the present invention and exchange the schematic diagram turning direct current and buffer circuit, Conductivity detection interface;
Figure 11 is the schematic diagram of conductance trip stop transmission circuit in the motherboard circuits of detection alarm instrument of the present invention, constant current signal driving circuit, exiting signal generating circuit;
Figure 12 is the schematic diagram of precision voltage source circuit in the motherboard circuits of detection alarm instrument of the present invention, conductance isolation analog power, safety electric capacity two circuit;
Figure 13 is the main program block diagram of detection alarm instrument of the present invention;
Figure 14 is the monitoring subroutine block diagram of detection alarm instrument of the present invention;
Figure 15 is the timer interrupt program block diagram of detection alarm instrument of the present invention;
Figure 16 is that the serial ports of detection alarm instrument of the present invention receives transmission interrupt routine block diagram;
Figure 17 is the CAN receive interruption flow chart of detection alarm instrument of the present invention.
Embodiment
The technological means realized for making the present invention, creation characteristic, reach object and effect is easy to understand, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiment
As shown in Figure 1, the present invention adopts a casing being of a size of 265 × 250 × 365mm, in casing, installation code industry control liquid crystal touch screen, motherboard, switch power module, stube cable, alternating current supply filter, power input socket, conductance electrode cable splice, temperature cable splice, switch accessory power outlet, CAN cable socket, ground terminal, connected in respective point by stub cable between them; Motherboard is also provided with separately shielding galvanized iron plate.
By computing machine self routing motherboard circuits, the local computing machine that all-network label is identical connects together automatically, as shown in Figure 3, in motherboard circuits of the present invention, first is connected and composed by integrated circuit U1, crystal oscillator U2, connector J1, resistance R1, electric capacity C1 ~ C22 common electrical at sheet circuit system 15; As shown in Figure 4, connected and composed by voltage stabilizer U3 and U4, connector J2, diode D1 ~ D4 and D6 ~ D7, light emitting diode D5 and D8, resistance R2 ~ R5, electric capacity C23 ~ C29, button S1 common electrical at sheet system power supply and reset circuit 19; As shown in Figure 5, simulating signal limiter protection circuit 20 is connected and composed by amplifier U6 and U8, voltage stabilizing chip U5, limited amplitude protection chip U7, resistance RX1 ~ RX9 and R6, electric capacity C30 ~ C35 and CX1, light emitting diode L1 common electrical; As shown in Figure 6, mainboard digital power 16 is connected to form by connector DC1 and outside connected switch power supply, wave filter U9, electric capacity C36 and C37 common electrical; Safety electric capacity one circuit 17 is connected to form by magnetic bead RL1, resistance R7, safety electric capacity C38 common electrical; Mainboard analog power 18 is connected to form by connector DC2 and outside connected switch power supply, wave filter U10 and U11, electric capacity C39 ~ C42 common electrical; As shown in Figure 7, switch output control circuit 22 is connected to form by relay U13, connector J5, triode N1, diode D9, resistance R15, electric capacity C44 common electrical, and wherein J5 provides switch control rule to export, and dial-up NBJ1 can forbid that it exports; Built-in function circuit 23 is connected to form by toggle switch NBJ1 and NBJ2, exclusion R14 common electrical, and NBJ1 is monitoring dial-up, and NBJ2 is CAN geocoding; Liquid crystal touch screen I/O communication interface circuit 24 is connected to form by integrated circuit U12, connector P1 and J4, resistance R10 ~ R13, magnetic bead RL2, electric capacity C43 common electrical, and wherein, P1 connects liquid crystal touch screen; Display board communication interface circuit 25 is connected to form by connector J3, resistance R8 ~ R9 common electrical, for subsequent use; As shown in Figure 8, CAN isolated drive circuit 21 is connected to form by integrated circuit U14, connector CAN1, resistance R16 ~ R17, electric capacity C45 common electrical, wherein, and the external CAN of CAN1; As shown in Figure 9, temperature detection interface 26 is made up of connector JT1, external semiconductor temperature sensor; Temperature becomes send buffer circuit 27 to be connected and composed by amplifier U16, signal isolator U15, resistance R18 ~ R20, electric capacity C46 ~ C55 common electrical; As shown in Figure 10, conductance measurement turns direct current and buffer circuit 29 is connected and composed by amplifier U17 and U20 ~ U21 and U24, AC/DC signal converter U19 and U22, signal isolator U18 and U23, resistance R21 ~ R25, electric capacity C56 ~ C75 common electrical with exchanging; Conductivity detection interface 30 is made up of connector JD1, external seven-electrode conductivity sensor; As shown in figure 11, conductance trip stop transmission circuit 28 is connected and composed by relay U25 ~ U29, triode N2 ~ N6, diode D10 ~ D14, resistance R26 ~ R31 common electrical; Constant current signal driving circuit 31 is connected and composed by amplifier U31 ~ U33, resistance RX10 ~ RX14 and RA1 ~ RA13, electric capacity C76 ~ C79 and C83 ~ C89 common electrical; Exiting signal generating circuit 32 is connected and composed by integrated circuit U30, resistance RIN1 and R32, electric capacity C80 ~ C81 and C82 and CF1 common electrical; As shown in figure 12, precision voltage source circuit 33 is connected and composed by voltage stabilizer U36 ~ U37, inductance L 2 ~ L5, electric capacity C94 ~ C97 and C99 ~ C100 common electrical; Conductance isolation analog power 34 is connected and composed by connector DC3 and outside connected switch power supply, wave filter U34 ~ U35, electric capacity C90 ~ C93 common electrical; Safety electric capacity two circuit 35 is connected and composed by resistance R33, magnetic bead RL3, safety electric capacity C98 common electrical;
Wherein, U1 optional C8051F060, U3, the optional TLE2024 of U4, U5 optional AMS1117, U6, U8 optional TLV2454, U7 optional TL7726, U9 ~ optional TY110P of U11 and U34 ~ U35, U12 optional MAX490CSA, U13 and U25 ~ optional CTM1054 of U29 optional CTX-5V, U14; The optional ISO124 of U16, U21 optional INA128, U15; U17, U20, U24 optional INA111 or INA121, U19, U22 optional AD536, U18, the optional T6650D of U23; U30 optional MAX038, U31 optional LM7171, U32 optional LM6172, U33 optional OPA627, U36, the optional K7805 of U37, the optional SUKON-07L of liquid crystal touch screen.
Principle of work of the present invention is as follows:
(1) temperature-voltage signal by semiconductor temperature sensor subsidiary on electrode produce, this millivolt signal first amplifies, isolate after connect on motherboard through cable connector;
(2) production process of conductance millivolt signal is as follows: the first sinusoidal signal of exiting signal generating circuit controlled generation certain frequency fixed amplitude, this signal connects constant current signal driving circuit 31, do after range switching control through conductance trip stop transmission circuit 28, produce certain driving constant current, this constant current through after straight process for driving conductance electrode, this constant current is flow through measuring resistance and detection cell simultaneously and is produced the AC signal of respective amplitude, the voltage of the larger generation of cell resistance is larger, this two-way AC signal enters ac/dc effective value converter respectively and produces corresponding DC voltage subsequently, this two-way DC voltage is through amplifying, after isolation processing, main frame is sent into again through simulating signal limiter protection circuit,
(3) temperature signal produced respectively by said process enters 12 A/D converters, conductance signal enters the A/D converter port of two-way 16 precision, the resistance at measuring cell two ends can be obtained by the simple operation of single-chip microcomputer, after the linear correcting process of this resistance, obtain accurate resistance value, the inverse of resistance value is exactly hold electric conductivity value accurately, then obtains standard conductivity value after electrode conductance constant and temperature compensation;
(4) each signal is after treatment sent in the mode of communicating interrupt the display that liquid crystal touch screen carries out corresponding data by first after the encoded packing of sheet system, namely refreshes CAN address display window 1, temperature display device 2, standard conductivity display window 3, switch pump instruction display window 10, system alarm state display window to change 12, CAN communication state display window to change 13 in real time;
(5) be also sent to first in sheet system in the mode of communicating interrupt after the current alerts button 4 on liquid crystal touch screen, real-time curve button 5, operation calibration frames button 6, history curve button 7, history alarm button 8, help button 9, automatic/hand switching push button 11, manual on/off switch button 14 are encoded, and perform corresponding operation;
(6) All hosts program and preset parameter are all kept at first in the sheet of sheet system in EEPROM, and computing variable is temporarily stored in first in the intrasystem RAM of sheet;
(7) first carry out the communication between corresponding interface and agreement in sheet system through CAN isolated drive circuit, using the intermediate value between upper and lower limit as control definite value, the switch producing pump again after Positive-Negative Action process exports, can provide through switch output control circuit often open, normally closed contact and completing; When conductivity exceedes upper and lower limit, produce instruction of reporting to the police;
(8) when system needs adjustment internal control parameter, pressing operation calibration picture, this picture is configured with multiple display window, is conductance millivolt indicating window respectively, with reference to millivolt indicating window, end resistance value indicating window, standard conductivity indicating window, holds electric conductivity value indicating window, conductance range indicating window, range automatic/hand indicating window; This touch-screen is furnished with input keyboard and makes amplitude limiting processing to data, data input realizes respectively by this keyboard of pressing, they respectively, electrode constant button, temperature compensation coefficient button, temperature slope button, zero temperature point button, resistance slope 12 button, resistance 0. 12 button, range 3/4 calibrate picture, conductivity zero-setting button, high alarm setting button, low alarm limit button, retardation time button, Positive-Negative Action button, return key frame button, send HMI data to enter single-chip microcomputer button; The data of all inputs all have power down protection process, note only having pressing force feed HMI data and entering single-chip microcomputer button and data could be sent into single-chip microcomputer; In order to ensure the precision measured, range one and two keeps off and is provided with public resistance slope correction and resistance is revised zero point; Special processing has been done to range 3/4, wherein, range 3 power taking resistance 500,600,700,800,900,1000,2000,3000,4000,5000 ohm of magnitudes of voltage located are as the foundation of interpolation of linearly tabling look-up, the processing procedure of range 4 is similar, and its resistance value is 5000,6000,7000,8000,9000,10000,20000,30000,40000,50000 ohm.
Technical indicator and the parameter of embodiments of the invention are as follows: (1) input voltage: AC220V ± 30%, 50Hz; (2) average power: 20W; (3) conductivity sensing range: 20 μ S ~ 200mS; (4) fluid temperature: 0 ~ 99.9 DEG C; (5) switch control rule mode: automatic or manual; (6) conductivity on-line checkingi point precision :≤1% (on a large scale); (7) trip stop maximum detection retardation time :≤2 seconds.
In use, first connect alternating current 220V voltage, outside connecting valve power supply, conductance electrode (with semiconductor temperature sensor), dosing pump, specific works step during detection is: (1) power-on in the present invention; (2) memory internal parameter is adjusted; Operator according to process conditions, alerting signal and recording curve, liquid crystal touch screen can adjust conductivity bound alarming value in time afterwards, and calibration of regularly conductance electrode being cleaned and returned to zero.
Mainframe program is shown in Figure 13, and measure monitoring handling procedure and see Figure 14, when using for the first time: arrange toggle switch NBJ2 as CAN address, notice that CAN address 0 is defaulted as host address, other CAN terminal address is not reproducible, arrange toggle switch NBJ1 to implicit parameter, start, delivers to original canonical parameter in RAM in sheet system to allow first, then reverse code to memory parameter bit, complete normal boot-strap, afterwards, operation calibration frames button on pressing liquid crystal touch screen, and by built-in keybad input parameter, they are: electrode constant button, temperature compensation coefficient button, temperature slope button, zero temperature point button, resistance slope 12 button, resistance 0. 12 button, range 3/4 calibrates picture, conductivity zero-setting button, high alarm setting button, low alarm limit button, retardation time button, Positive-Negative Action button, return key frame button, HMI data are sent to enter single-chip microcomputer button, after setting parameter completes, attention must be pressed force feed HMI data and be entered single-chip microcomputer button, like this, single-chip microcomputer could receive corresponding data, and these data are saved in inner EEPROM, during in order to start next time, automatically this memory parameter is called in.Simultaneously, LCDs also regularly refreshes the data that single-chip microcomputer is sent here, and they are: conductance millivolt indicating window, reference millivolt indicating window, end resistance value indicating window, standard conductivity indicating window, end electric conductivity value indicating window, conductance range indicating window, range auto-manual indicating window; The function utilizing liquid crystal touch screen built-in draws real-time curve, history curve, and can show Realtime Alerts and history is reported to the police.Internal system makes Interruption with 25 milliseconds, sees Figure 15, and corresponding software time timer is used as internal control management; See Figure 16, also take interrupt mode with the serial data exchange of liquid crystal touch screen, send and be all respectively arranged with buffer circle with reception, watchdog routine only need process just to this buffer circle; See Figure 17, CAN is once receive the time synchronizing signal that main frame sends, and communication time resets at once, then, by CAN address code size, within the corresponding time period, sends corresponding information; Temperature channel makes linear revise by slope and zero point; Conductance range 1/2 only need make linear revise to resistance slope 12 and resistance 0. 12, and conductance range 3/4 will enter another picture, and records the magnitude of voltage under each measuring resistance, and this makeover process needs to use a. c. resistance box; The adjustment of electrode constant needs standard K CL damping fluid, and temperature value adjustment needs thermometer; Arrive this, complete machine adjustment is complete; Peripheral operation does regular, suitable adjustment by workman.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (9)
1. a single channel seven-electrode conductivity test and monitoring instrument, comprises data display and forms with input actuation means and motherboard, it is characterized in that,
The display of described data is realized by LCD panel with input actuation means, comprises display window and action button, for the input operation of the informational function display and control information that complete described monitor;
Described motherboard comprises first at sheet circuit system, mainboard digital power, safety electric capacity one circuit, mainboard analog power, at sheet system power supply and reset circuit, simulating signal limiter protection circuit, CAN isolated drive circuit, switch output control circuit, built-in function circuit, liquid crystal touch screen I/O communication interface circuit, display board communication interface circuit, temperature detection interface, temperature becomes send buffer circuit, conductance trip stop transmission circuit, conductance measurement turns direct current and buffer circuit with exchanging, Conductivity detection interface, constant current signal driving circuit, exiting signal generating circuit, precision voltage source circuit, conductance isolation analog power, safety electric capacity two circuit,
Described mainboard digital power by power lead respectively with safety electric capacity one circuit, on sheet system power supply and reset circuit, CAN isolated drive circuit, switch output control circuit, built-in function circuit, liquid crystal touch screen I/O communication interface circuit, display board communication interface circuit, conductance trip stop transmission circuit, corresponding point are connected; Describedly also be connected in the corresponding point of sheet circuit system, mainboard digital power, mainboard analog power, simulating signal limiter protection circuit with first respectively with digital power line by analog power line at sheet system power supply and reset circuit, the core component for above-mentioned motherboard provides analog power and digital power; Described conductance isolation analog power by analog power line become with temperature detection interface, temperature respectively send buffer circuit, conductance measurement with exchange turn direct current and buffer circuit, constant current signal driving circuit, precision voltage source circuit, safety electric capacity two circuit corresponding point be connected; Described first is connected with the corresponding point of CAN isolated drive circuit, liquid crystal touch screen I/O communication interface circuit, display board communication interface circuit by data communication line respectively at sheet circuit system; Described first is connected with simulating signal limiter protection circuit by analog signal line at sheet circuit system, described first is connected with switch output control circuit, built-in function circuit, conductance trip stop transmission circuit by switch signal line at sheet circuit system, and described first is also connected with at sheet system power supply and reset circuit by reset line at sheet circuit system; Described exiting signal generating circuit is connected by the corresponding point of power lead with precision voltage source circuit; Described constant current signal driving circuit is connected respectively by the corresponding point of signal wire with conductance trip stop transmission circuit, exiting signal generating circuit, Conductivity detection interface; Described conductance measurement turns direct current and buffer circuit is connected respectively by the corresponding point of signal wire with simulating signal limiter protection circuit, Conductivity detection interface with exchanging; Described temperature becomes send buffer circuit to be connected respectively by the corresponding point of signal wire with temperature detection interface, simulating signal limiter protection circuit;
Described LCD panel is equipped with interface and is connected with the liquid crystal touch screen I/O communication interface circuit on described motherboard by stub cable.
2. single channel seven-electrode conductivity test and monitoring instrument according to claim 1, it is characterized in that, described liquid crystal touch screen is powered by external DC24V, and the mainboard digital power of described motherboard, mainboard analog power, conductance are isolated corresponding point on analog power and distinguished external 3 Switching Power Supplies by power lead.
3. single channel seven-electrode conductivity test and monitoring instrument according to claim 1, it is characterized in that, described temperature detection interface is by the external semiconductor temperature sensor of shielded cable, and described Conductivity detection interface is by the external seven-electrode conductivity sensor of shielded cable or four electrode conductivity sensors.
4. single channel seven-electrode conductivity test and monitoring instrument according to claim 1, is characterized in that, described first comprises integrated circuit U1, crystal oscillator U2 at sheet circuit system, connector J1, resistance R1, electric capacity C1 ~ C22 common electrical connect and compose; Describedly comprise voltage stabilizer U3 and U4, connector J2 at sheet system power supply and reset circuit, diode D1 ~ D4 and D6 ~ D7, light emitting diode D5 and D8, resistance R2 ~ R5, electric capacity C23 ~ C29, button S1 common electrical connect and compose; Described simulating signal limiter protection circuit comprises amplifier U6 and U8, voltage stabilizer U5, limited amplitude protection chip U7, resistance RX1 ~ RX9 and R6, electric capacity C30 ~ C35 and CX1, light emitting diode L1 common electrical connect and compose; Described mainboard digital power comprises connector DC1 and outside connected switch power supply, wave filter U9, electric capacity C36 and C37 common electrical connect to form; Described safety electric capacity one circuit comprises magnetic bead RL1, resistance R7, safety electric capacity C38 common electrical connects to form; Described mainboard analog power comprises connector DC2 and outside connected switch power supply, wave filter U10 and U11, electric capacity C39 ~ C42 common electrical connect to form; Described switch output control circuit comprises relay U13, connector J5, triode N1, diode D9, resistance R15, electric capacity C44 common electrical connect to form, and wherein J5 provides switch control rule to export, and dial-up NBJ1 can forbid that J5 exports; Described built-in function circuit comprises toggle switch NBJ1 and NBJ2, exclusion R14 common electrical connects to form, and wherein NBJ1 is monitoring dial-up, and NBJ2 is CAN geocoding; Described liquid crystal touch screen I/O communication interface circuit comprises integrated circuit U12, connector P1 and J4, resistance R10 ~ R13, magnetic bead RL2, electric capacity C43 common electrical connect to form, and wherein, P1 connects described liquid crystal touch screen; Described display board communication interface circuit comprises connector J3, resistance R8 ~ R9 common electrical connects to form; Described CAN isolated drive circuit comprises integrated circuit U14, connector CAN1, resistance R16 ~ R17, electric capacity C45 common electrical connect to form, wherein, and the external CAN of CAN1; Described temperature detection interface is made up of connector JT1, for external semiconductor temperature sensor; Described temperature becomes send that buffer circuit comprises amplifier U16, signal isolator U15, resistance R18 ~ R20, electric capacity C46 ~ C55 common electrical connect and compose; Described conductance measurement turns that direct current and buffer circuit comprise amplifier U17 and U20 ~ U21 and U24, AC/DC signal converter U19 and U22, signal isolator U18 and U23, resistance R21 ~ R25, electric capacity C56 ~ C75 common electrical connect and compose with exchanging; Described Conductivity detection interface comprises connector JD1 and forms, external seven-electrode conductivity sensor; Described conductance trip stop transmission circuit comprises relay U25 ~ U29, triode N2 ~ N6, diode D10 ~ D14, resistance R26 ~ R31 common electrical connect and compose; Described constant current signal driving circuit comprises amplifier U31 ~ U33, resistance RX10 ~ RX14 and RA1 ~ RA13, electric capacity C76 ~ C79 and C83 ~ C89 common electrical and connects and composes; Described exiting signal generating circuit comprises integrated circuit U30, resistance RIN1 and R32, electric capacity C80 ~ C81 and C82 and CF1 common electrical and connects and composes; Described precision voltage source circuit comprises voltage stabilizer U36 ~ U37, inductance L 2 ~ L5, electric capacity C94 ~ C97 and C99 ~ C100 common electrical and connects and composes; Described conductance isolation analog power comprises connector DC3 and outside connected switch power supply, wave filter U34 ~ U35, electric capacity C90 ~ C93 common electrical connect and compose; Described safety electric capacity two circuit comprises resistance R33, magnetic bead RL3, safety electric capacity C98 common electrical connects and composes.
5. single channel seven-electrode conductivity test and monitoring instrument according to claim 4, it is characterized in that, described integrated circuit U1 is chip C8051F060, described voltage stabilizer U3, U4, U5 is AMS1117, described amplifier U6 is TLE2024, described amplifier U8 is TLV2454, described limited amplitude protection chip U7 is chip TL7726, described wave filter U9 ~ U11 and U34 ~ U35 is TY110P, described integrated circuit U12 is chip MAX490CSA, described relay U13 and U25 ~ U29 is CTX-5V, described integrated circuit U14 is chip CTM1054, described amplifier U16, U21 is INA128, described signal isolator U15 is ISO124, described amplifier U17, U20, U24 are INA111 or INA121, described AC/DC signal converter U19, U22 are AD536, described signal isolator U18, U23 are T6650D, described integrated circuit U30 is MAX038, described amplifier U31 is chip LM7171, and described amplifier U32 is chip LM6172, and described amplifier U33 is chip OPA627, described voltage stabilizer U36, U37 are K7805, and described liquid crystal touch screen is SUKON-07L.
6. single channel seven-electrode conductivity test and monitoring instrument according to claim 1, it is characterized in that, described action button comprises current alerts button, the defeated button of real-time curve, operation calibration frames button, history curve button, history alarm button, help button, automatic/hand switching push button, manual on/off switch button.
7. single channel seven-electrode conductivity test and monitoring instrument according to claim 1, it is characterized in that, described display window comprises CAN address display window, temperature display device, standard conductivity display window, switch pump instruction display window, system alarm state display window to change, CAN communication state display window to change.
8. single channel seven-electrode conductivity test and monitoring instrument according to claim 1, is characterized in that, described monitor adopts a point gear accurate interchange constant current drive, and excitation frequency is adjustable, makes it possess anti-electrode incrustation ability; Described monitor adopts high resistant instrument amplifier to gather signal.
9. single channel seven-electrode conductivity test and monitoring instrument according to claim 1, it is characterized in that, the range of described monitor is provided with four gears, directly measures the conductivity of 20uS/cm ~ 200mS/cm scope, coordinates the electrode of various conductance constant can expand range ability.
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