CN102279319B - Self-compensating single-way precise conductivity detection alarm with symmetrical leads - Google Patents
Self-compensating single-way precise conductivity detection alarm with symmetrical leads Download PDFInfo
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- CN102279319B CN102279319B CN201110174145XA CN201110174145A CN102279319B CN 102279319 B CN102279319 B CN 102279319B CN 201110174145X A CN201110174145X A CN 201110174145XA CN 201110174145 A CN201110174145 A CN 201110174145A CN 102279319 B CN102279319 B CN 102279319B
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Abstract
The invention discloses a self-compensating single-way precise conductivity detection alarm with symmetrical leads, which comprises a display device and a built-in circuit board, wherein the display device comprises a liquid crystal touch screen, a display window, an operation button and an indicator lamp; the built-in circuit board comprises a main board and a display board; and the main board is electrically connected to the display board. The self-compensating single-way precise conductivity detection alarm with symmetrical leads is used for detecting and monitoring the conductivity in real time, has the advantages of high measuring precision, comprehensive anti-interference property, high degree of automation, high degree of intellectualization, low manufacturing cost and the like, is reliable in working, and is convenient to operate, manufacture and maintain.
Description
Technical field
The invention belongs to the online detection field of chemical process parameter, relate to the little sugar in sugar refinery part online indirect detection device, be specifically related to the self-compensating single-channel precision conductivity detection alarm instrument of a kind of band symmetrical lead.
Background technology
In the chemical reaction process, conductivity is an important parameter of solution, and its size is the conductive capability of reflection solution directly, and closely related with electrolytical concentration; And organic concentration also can change by suitable reactor conductive materials into, and then measures the variation size of reaction front and back conductivity, thereby through calculating its concentration; In addition, also have class half electrolyte, under high frequency pumping, its concentration is also closely related with conductivity; These are used conductivity and carry out the occasion of other parameter detecting as intermediate variable, all need a kind of stable, accurate conductivity detector, and the electric conductivity detector of domestic manufacturer's production at present, generally all by resistance box, manually examine and determine conductivity meter, use comparatively trouble, and automaticity is low; Do not consider that perhaps wire, on the impact that conductivity detects, has a strong impact on self calibration precision and accuracy of detection, special particularly evident in the occasion of high frequency pumping; And mostly expensive from the equipment of external import, maintenance maintenance is difficult.
Summary of the invention
Purpose of the present invention is exactly in order to solve above-mentioned the deficiencies in the prior art part, provides a kind of band symmetrical lead self-compensating single-channel precision conductivity detection alarm instrument.The way that the present invention adopts inside and outside symmetrical lead to combine with inner per mille accuracy standard resistance, have that measuring accuracy is high, reliability is high, function is many, cost is low, intelligent degree is high, make easy to maintenance, can with the advantages such as miscellaneous equipment networking, good energy-conserving effect, lead the electrode of constant except connecting various electricity, traditional excitation frequency that also can compatible general conductivity meter, hang down all 70Hz, high all 1100Hz, and the excitation frequency of Very High Cycle 10KHz, 100KHz can be provided.
The objective of the invention is to realize by following technical solution:
The self-compensating single-channel precision conductivity detection alarm instrument of a kind of band symmetrical lead, comprise display device and internal circuit board, and as shown in Figure 1, described display device comprises liquid crystal touch screen, conductivity display window, parameter value display window, action button and pilot lamp; Internal circuit board comprises motherboard and display board, and motherboard is electrically connected by simple connector or stub cable mutually with display board, and the motherboard outside is connected with conductance electrode by symmetrical cable, and inside is connected with the measuring resistance array by symmetrical cable; Symmetrical cable is twin-concentric cable; Liquid crystal touch screen is connected with the main frame corresponding point by stub cable, carry out data communication, conductivity display window, parameter value display window, action button and pilot lamp are fixed on display board, and by second on display board, in the sheet system, carry out button scanning and coding, charactron and pilot lamp refresh, second in the sheet system by simple connector or stub cable and the electrical connection of motherboard corresponding point, wherein reset button is connected with the motherboard corresponding point by the reset signal cable;
as shown in Figure 2, the circuit of described motherboard is by the general supply interface, first in the sheet system, the mainboard digital power circuit, mainboard analog power circuit, at sheet system power circuit, the simulating signal limiter protection circuit, CAN bus insulating power supply DC/DC and filter circuit, CAN Bus isolation driving circuit, solenoid valve isolation output control circuit, extend out RAM and battery protecting circuit, crystal oscillation and reset circuit, the built-in function circuit, liquid crystal touch screen I/O communication interface circuit, the display board communication interface circuit, electricity is led with the isolation digital power circuit, electricity is led with isolation simulation power circuit, the switching signal buffer circuit, the precision voltage source circuit, active crystal oscillation and exiting signal generating circuit, the signal filtering driving circuit, conductance measurement and self calibration commutation circuit, electricity is led the trip stop transmission circuit, electricity is led the detection interface, measuring resistance switching array circuit, electric conductivity value exchanges and turns direct current and buffer circuit, temperature becomes send buffer circuit, the temperature detection interface is electrically connected composition jointly,
As shown in Figure 3, the circuit of display board is comprised of in sheet circuit system, display power supply filtering circuit, charactron and action button and the common electrical connection of pilot lamp control circuit display board and motherboard interface, second.
As shown in Figure 4, in motherboard circuits of the present invention, the general supply interface is comprised of external 24V Switching Power Supply; First consists of integrated circuit U5 and the common electrical connection of UK1, connector J1, resistance R 3, resistance R K1, resistance R 6, capacitor C 6～C24 and capacitor C K1 in the sheet system; Formed with R2, capacitor C 1～C5 and the common electrical connection of lithium battery BTI by voltage stabilizer U1 and U4, connector JP1, diode D1～D6, light emitting diode LP1 and LP2, resistance R 1 with power circuit in the sheet system; Extending out RAM and battery protecting circuit consists of integrated chip U2 and the common electrical connection of U3; Crystal oscillation and reset circuit are comprised of with R5, capacitor C 25～C28, the common electrical connection of button U6 crystal oscillator U7, resistance R 4; As shown in Figure 5, the simulating signal limiter protection circuit consists of amplifier U8 and the common electrical connection of U9, voltage stabilizing chip U10, limited amplitude protection chip U11, resistance R X1～RX7, capacitor C X1～CX5 and light emitting diode L1; Solenoid valve isolation output control circuit jointly is electrically connected and forms by relay U12 and U13, triode N1 and N2, diode D7 and D8, resistance R 7, resistance R 8 and connector CAN1; As shown in Figure 6, CAN Bus isolation driving circuit consists of integrated circuit U14, high speed photo coupling U15 and U16, resistance R 9～R15, the common electrical connection of capacitor C 29～C35, connector CAN2; As shown in Figure 7, the built-in function circuit consists of toggle switch NBJ1 and the common electrical connection of resistance R 20; Liquid crystal touch screen I/O communication interface circuit consists of the common electrical connection of connector P2, resistance R 16～R17; The display board communication interface circuit consists of connector P1, resistance R 16～R19, the common electrical connection of capacitor C 36; As shown in Figure 8, the switching signal buffer circuit consists of high speed photo coupling U17～U20, resistance R 21～R25, the common electrical connection of capacitor C 38～C40; Active crystal oscillation and exiting signal generating circuit consist of with the common electrical connection of C43 active crystal oscillator Y1, signal generator U21, resistance R 26～R30, magnetic bead RL1～RL3, capacitor C 42; The precision voltage source circuit consists of voltage stabilizer U22, diode D9, capacitor C 41, the common electrical connection of capacitor C 44～C46, short-circuiting device CB1; As shown in Figure 9, the signal filtering driving circuit consists of with the common electrical connection of L3 amplifier U23 and U24, resistance R 31～R35, capacitor C 47～C58, inductance L 2; As shown in figure 10, electricity is led the trip stop transmission circuit and jointly is electrically connected and forms with U33, capacitor C A1 and CA2, capacitor C 59～C62 with R51, resistance R A1, diode D10～D14, amplifier U30 by relay U25～U29, triode N3～N7, resistance R 36～R48, resistance R 50; Conductance measurement and self calibration commutation circuit consist of the common electrical connection of relay U34, triode N8, resistance R 55, diode D15, connector ADIANDAOBO1 and ADIANDAOBI1; Electricity is led the detection interface and is consisted of connector ADIANDAO1; Electricity is led to exchange and is turned direct current and buffer circuit consists of integrated circuit U31, amplifier U30, optocoupler U32, resistance R 49, the common electrical connection of resistance R 52～R54, capacitor C 63～C69; As shown in figure 11, measuring resistance switching array circuit consists of relay UMD1～UMD5, relay UUP1～UUP5, relay U35, triode N9～N11, resistance R A2～RA23, resistance R 56～R59, diode D16～D18, the common electrical connection of amplifier U23; As shown in figure 12, the temperature change send buffer circuit to consist of amplifier U37, optocoupler U38, constant current tube U36, resistance R 60～R70, the common electrical connection of capacitor C 70～C73; The temperature detection interface consists of connector JPTAX1.
As shown in figure 13, the CAN bus consists of the common electrical connection of DC/DC power module U43, resistance R 101, capacitor C 74, capacitor C 75 and inductance L 19～L21 with insulating power supply DC/DC and filter circuit; Mainboard consists of DC/DC power module U44, resistance R 102, capacitor C 76, the common electrical connection of wave filter U45 with digital power circuit; Mainboard consists of with LED2, resistance R 104～R113, capacitor C 78～C86 and the common electrical connection of inductance L 22 DC/DC power module U48, voltage stabilizing chip U46 and U49, wave filter U47 and U50, diode D19 and D20, LED 1 with the analog power circuit; Electricity is led with the isolation digital power circuit and is consisted of integration module U54, resistance R 124, the common electrical connection of capacitor C 96～C97, inductance L 26～L28; Electricity is led with isolation simulation power circuit and jointly is electrically connected and forms with LED4, resistance R 114～R123, capacitor C 87～C195, inductance L 23～L25 with D22, LED 3 by DC/DC power module U51, voltage stabilizing chip U52 and U53, diode D21.
As shown in figure 14, in the circuit of display board of the present invention, display board and motherboard interface consist of connector P3, button RESET1, resistance R 71, resistance R 74, resistance R 75 and capacitor C D1 electrical connection; Second consists of integrated chip U39, connector J2, resistance R 72 and resistance R 73 electrical connections at the sheet circuit system; The display power supply filtering circuit consists of voltage stabilizer U40, capacitor C D2～CD8 electrical connection; As shown in figure 15, charactron and action button and pilot lamp control circuit consist of integration slice U41, integration slice U42, resistance R 76～R100, charactron L17, charactron L18, pilot lamp L4～L16 and button S1～S12 electrical connection.
Also comprise the power panel circuit in the circuit of motherboard of the present invention, the general supply interface is led with isolation digital power, electricity and is led with corresponding point on the circuit of isolating analog power and be connected with insulating power supply DC/DC and filter circuit, solenoid valve isolation output control circuit, electricity with analog power, CAN bus with digital power, mainboard with mainboard respectively by power lead, for motherboard provides respectively separately simulation insulating power supply and digital insulating power supply; First is connected with CAN Bus isolation driving circuit, liquid crystal touch screen I/O communication interface circuit, display board communication interface circuit corresponding point respectively by data communication line in the sheet system; First is connected with the simulating signal limiter protection circuit by analog signal line in the sheet system, first the sheet system by switch signal line and built-in function circuit, solenoid valve isolation output control circuit, switching signal buffer circuit, conductance measurement lead the trip stop transmission circuit with self calibration commutation circuit, electricity, measuring resistance switching array circuit is connected, first the sheet system also by data line, crystal oscillation line and reset line respectively with extend out RAM and battery protecting circuit, crystal oscillation and reset circuit and be connected; Be connected in sheet system, simulating signal limiter protection circuit corresponding point with analog power, first with mainboard with digital power with mainboard respectively with the digital power line by the analog power line with power circuit in the sheet system, analog power and the digital power of high-quality is provided for the system core.
Active crystal oscillation of the present invention is connected with switching signal buffer circuit, precision voltage source circuit and signal filtering driving circuit corresponding point by power lead, signal wire respectively with exiting signal generating circuit; Conductance measurement is led between trip stop transmission circuit and measuring resistance switching array circuit and is connected by signal wire with self calibration commutation circuit, electricity; Electricity is led the trip stop transmission circuit and is led and detect interface, electricity and lead to exchange and turn direct current and buffer circuit is connected with electricity respectively by signal wire; Temperature becomes send buffer circuit to be connected with the temperature detection interface by signal wire; Electricity is led to exchange and is turned direct current and buffer circuit, temperature and become and send buffer circuit to be connected with the simulating signal limiter protection circuit through signal wire respectively; Electricity is led the detection interface and is connect outside conductance electrode by twin-concentric cable; The temperature detection interface is by the accurate platinum sensor of the external four-wire system of cable.
Analog power on mainboard of the present invention and digital power are provided with analog power with digital power and mainboard by mainboard respectively; Liquid crystal touch screen I/O communication interface circuit is provided by the outside connected switch power supply separately; The digital power that the display board communication interface circuit uses is provided with digital power by mainboard; Motherboard is led with the isolation digital power and is provided power supply for switching signal buffer circuit and precision voltage source circuit by electricity; Motherboard is led and is led trip stop transmission circuit, measuring resistance switching array circuit, electricity with the isolation analog power for signal filtering driving circuit, conductance measurement and self calibration commutation circuit, electricity and lead to exchange and turn direct current and buffer circuit and temperature change and send buffer circuit that the isolation analog power is provided by electricity; The isolation digital power that CAN Bus isolation driving circuit uses is provided with insulating power supply DC/DC and filter circuit by the CAN bus.
In the circuit of display board of the present invention, the display power supply filtering circuit is connected with motherboard with the motherboard interface through display board, obtains power supply and to second, in sheet circuit system, charactron and action button and pilot lamp control circuit, powers; Second at the sheet circuit system through display board and motherboard interface and motherboard communications exchange data, and with charactron, with action button, with the pilot lamp control circuit, by inner synchronous serial line, be connected, button is scanned and encodes, the output data are used for refreshing charactron and pilot lamp.
Action button of the present invention comprises that button, parameter are set to be increased button, the fast button of parameter, parameter and subtract button, reset button, code and increase that button, code value increase button, code value subtracts button, parameter save button, one-shot switch, internal calibration button, lock I button and lock П button; Described pilot lamp comprises calibration pilot lamp, temperature indicator, penalty coefficient pilot lamp, electrode constant pilot lamp, the fast pilot lamp of parameter, preserves pilot lamp, single measurement pilot lamp, lock I pilot lamp, lock П pilot lamp, tracking measurement pilot lamp, internal calibration pilot lamp, μ S pilot lamp, mS pilot lamp and alarm lamp.
Principle of work of the present invention is as follows:
(1) the temperature millivolt signal is taken advantage of in the excitation constant current and is produced by four-wire system platinum resistance subsidiary on electrode, and millivolt signal connects on motherboard through cable connector;
(2) it is as follows that electricity is led the production process of millivolt signal: the sinusoidal signal of at first active crystal oscillation and the controlled generation certain frequency of exiting signal generating circuit fixed amplitude, remove high-frequency harmonic and amplify after low-pass filter filtering and drive, this signal is used for encouraging tested electricity to lead, the electric current that electricity is led larger generation is just larger, current amplifier amplifies this electric current subsequently, after filtering, enter the ac/dc effective value converter and produce with electricity and lead the linear DC voltage of size, send into main frame again after the isolation of simulating signal limiter protection circuit, realize measuring the redirect of gear by the size of controlled change current feedback resistance,
(3) temperature signal and the conductance signal that produce respectively by said process enter the A/D converter port of 16 precision of two-way, and enter at the sheet circuit system and carry out calculation process;
(4) after treatment each signal, first via signal is sent to display board on second in the internal RAM of sheet circuit system in the sheet system in the mode of communicating interrupt by first, then second refreshes charactron and pilot lamp at the sheet circuit system successively according to data encoding, namely refresh in real time the conductivity display window, the parameter value display window, the calibration pilot lamp, temperature indicator, the penalty coefficient lamp, the electrode constant lamp, the fast pilot lamp of parameter, preserve pilot lamp, the single measurement pilot lamp, lock I pilot lamp, lock П pilot lamp, the tracking measurement pilot lamp, the internal calibration pilot lamp, μ S pilot lamp, the mS pilot lamp, alarm lamp, and by external alarm, realize sound and light alarm,
(5) on display board arrange button, parameter increase button, the fast button of parameter, parameter subtract button, code increase button, code value increase button, code value subtract button, parameter save button, one-shot switch, lock I button, lock П button by second after the sheet circuit system scans and encodes also the mode with communicating interrupt be sent to first in the sheet system; Reset button on display board is arranged separately and is connected on other circuit board; Except monitor code and code value the mode with combination, all above-mentioned input/output datas all carry out data real-time exchange in the sheet system with mode and the liquid crystal touch screen of communicating interrupt via first;
(6) All hosts program and preset parameter all are kept at first in the sheet of sheet system in EEPROM, and the computing variable is temporarily stored in first in the intrasystem RAM of sheet; Part is remembered parameter and is stored in and extends out in RAM and battery protecting circuit;
(7) during internal control, can watch and adjust each relevant parameters; During peripheral operation, each parameter is presented on parameter value in real time, and to point out its parameter value according to calibration pilot lamp, temperature indicator, penalty coefficient pilot lamp, electrode constant pilot lamp be corresponding indicated value, handoff functionality between pilot lamp is realized by button is set, can make indicator light cycle move to each corresponding point, its respective value can increase button by parameter, parameter subtracts button adjustment, by the fast button of parameter, come the fast lamp of handoff parameter bright/go out, when the fast lamp of parameter is bright, can adjust quickly corresponding parameter;
(8) first carry out communication between corresponding interface and agreement in the sheet system through CAN Bus isolation driving circuit, and the switch of solenoid valve connects the 24V switch electromagnetic valve again and completes through solenoid valve isolation output control circuit; The unit of conductivity represents by μ S pilot lamp, mS pilot lamp, and when upper two lamps were simultaneously bright, the unit that represents this conductivity was nS, and when conductivity surpassed upper and lower limit, alarm lamp was bright; After internal calibration allows, while pressing the internal calibration button, the internal calibration pilot lamp is bright, conductivity measurements remains unchanged, conductivity detection alarm instrument inside is connected on measuring resistance switching array circuit through symmetrical twin-concentric cable, survey the actual voltage value of each standard electric on leading a little, and can memorize, can use during in order to the next time start;
While (9) normally measuring, the tracking measurement pilot lamp is bright, the single measurement pilot lamp goes out, machine is completed the measurement of trip stopping automatically, after pressing one-shot switch, the tracking measurement pilot lamp goes out, and the single measurement pilot lamp is bright, machine is completed detailed measurement, and obtains capacitance and the pure conductivity of detected solution and electrode system;
(10) when system need to be adjusted the internal control parameter, difference pressing lock I button, lock П button, make lock I pilot lamp simultaneously bright with lock П pilot lamp, at this moment, conductivity display window and parameter value display window change into and show internal code value and corresponding code thereof, and button, code value increase button, code value subtracts button, fast each inner parameter of button accurate adjustment of parameter but by code, increase; In any case, press the parameter save button, preserve pilot lamp bright, all parameters are preserved; When the system appearance is undesired, all can press reset button, the machine another warm is started, with enabling.
The present invention compared with prior art has the following advantages:
(1) measuring accuracy is high, adopts the precision optical machinery relay, and its contact resistance is very little, and by adopting symmetrical compensation electric wire and the method that per mille precision resistance combines, the electricity that has solved well the self calibration generation is led the precision problem of correction card; Temperature measurement accuracy is high, has adopted the accurate platinum resistance of high precision four-wire system as sensor; The power supply precision is high, and its first order adopts Switching Power Supply, and the second level namely transfers analog power to, and what have also is connected to third level analog power, makes it have higher input adaptability and higher output accuracy;
(2) compatible good, be connected in series certain resistance by outer electrode, can avoid short circuit destruction by guard amplifier, can adapt to again electrode constant and be respectively 10.0,1.0,0.1,0.01 etc. Different electrodes, except traditional excitation frequency that low all 70Hz, high all 1100Hz are provided, Very High Cycle 10KHz, two kinds of frequencies of super Very High Cycle 100KHz also are provided, and device is built separately table to every kind of frequency, starts or rear this conductivity table of automatically calling in that resets;
(3) function is many, and by the adjustment of electrode constant, the conductance electrode that can connect various standard and nonstandard standards uses, the multiple alarm prompting is arranged, can connect registering instrument or servomotor amplifier, communication isolation drive module is arranged, can carry out communication with CAN bus and corresponding agreement with DCS or other system;
(4) conductivity can turn on and off corresponding dc switch solenoid valve according to its upper and lower limit alerting signal, and while also having a road to measure/clean state for manual switching, the switch ultrasonic cleaner cleans electrode;
(5) functional reliability is high, adopt comprehensive Anti-Jamming Technique, electricity is led driving power and is adopted the OPA552 amplifier, has self-protection function, electricity is led and is detected input stage employing OPA627 amplifier, other amplifier has also all adopted the low drift of high frequency precision amplifier, thereby has guaranteed that input becomes the precision of sending; All adopt digitizing techniques to design, its setting parameter changes by button or touch-screen to be adjusted, and be retained in EEPROM or power down protection RAM in; Adopt fault-tolerant technique, fault only appears in this module, and other non-fault is work as usual partly, while as communication isolation drive module, breaking down, overall measurement is work as usual partly, and each road of potential electrode part is independent, and being added with holding circuit, the fault on a few roads can not have influence on other road;
(6) easy to operate, internal control is completed by the technician, peripheral operation is done regularly to adjust and get final product by the workman, the operator is according to process conditions, alerting signal and recording curve, in time adjust conductivity warning upper and lower limit and electrode is made periodic cleaning and get final product, the menu Chinese character prompting is arranged on liquid crystal touch screen, and all data all can increase intuitively or reduce;
(7) automaticity is high, owing to having adopted inside and outside symmetrical compensation wire, lead correction card by the electricity of internal calibration generation and have very high precision, to guarantee the accuracy of conductance measurement, conductance electrode adopts twin-concentric cable to connect, and adopt five grade of four hop count to learn model and ask conductivity value, then temperature and electric capacity are compensated and obtain various conductivity;
(8) intelligent degree is high, and inner parameter has default value, by the technician, is adjusted and gets final product in internal control, and multinomial warning function is arranged, and is convenient to help the reason of failure judgement and the position at place;
(9) between circuit board of the present invention, available simple connector or stub cable connect, manufacturing, easy to maintenance, cost is low, cabinet in employing, the complete machine radiating condition is good, and cabinet is hermetically sealed, can exempt dust, moisture intrusion, adopt traditional highlighted charactron, pilot lamp and gently melt the type button and liquid crystal touch screen duplex and the use in modern times, good looking appearance, easy to operate;
(10) anti-deadlock function, the every place that circulation is arranged and may cause deadlock of native system program, inside adds counter, and super scope is jumped out automatically, and the system surplus is larger, can work in 220V ± 30% scope.
Description of drawings
Fig. 1 is the contour structures schematic diagram of detection alarm instrument of the present invention.
Fig. 2 is the motherboard circuits structural representation of detection alarm instrument of the present invention.
Fig. 3 is the display board circuit structural representation of detection alarm instrument of the present invention.
Fig. 4 be first in the motherboard circuits of detection alarm instrument of the present invention the sheet system, in the sheet system with power circuit, extend out the schematic diagram of RAM and battery protecting circuit, crystal oscillation and reset circuit.
Fig. 5 is simulating signal limiter protection circuit in the motherboard circuits of detection alarm instrument of the present invention and the schematic diagram of solenoid valve isolation output control circuit.
Fig. 6 is the schematic diagram of the CAN Bus isolation driving circuit in the motherboard circuits of detection alarm instrument of the present invention.
Fig. 7 is built-in function circuit, the liquid crystal touch screen I/O communication interface circuit in the motherboard circuits of detection alarm instrument of the present invention, the schematic diagram of display board communication interface circuit.
Fig. 8 is switching signal buffer circuit, active crystal oscillation and the exiting signal generating circuit in the motherboard circuits of detection alarm instrument of the present invention, the schematic diagram of precision voltage source circuit.
Fig. 9 is the schematic diagram of the signal filtering driving circuit in the motherboard circuits of detection alarm instrument of the present invention.
Figure 10 be the electricity in the motherboard circuits of detection alarm instrument of the present invention lead trip stop transmission circuit, conductance measurement lead with self calibration commutation circuit, electricity detect interface, electricity is led and is exchanged the schematic diagram that turns direct current and buffer circuit.
Figure 11 is the schematic diagram of the measuring resistance switching array circuit in the motherboard circuits of detection alarm instrument of the present invention.
Figure 12 is that the temperature in the motherboard circuits of detection alarm instrument of the present invention becomes the schematic diagram that send buffer circuit.
Figure 13 is that the CAN bus in the motherboard circuits of detection alarm instrument of the present invention is led with isolation digital power circuit, electricity and led schematic diagram with isolation simulation power circuit with analog power circuit, electricity with digital power circuit, mainboard with insulating power supply DC/DC and filter circuit, mainboard.
Figure 14 is display board in the display board circuit of detection alarm instrument of the present invention and motherboard interface, the second schematic diagram at sheet circuit system, display power supply filtering circuit.
Figure 15 is charactron in the display board circuit of detection alarm instrument of the present invention and the schematic diagram of action button and pilot lamp control circuit.
Embodiment
, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail, but the present invention is not limited to this.
As shown in Figure 1, the present invention adopts a casing that is of a size of 400 * 300 * 200mm, liquid crystal touch screen, display board, motherboard, switch power module, stube cable and power input socket are installed in casing, high-power voltage stabilizer is drawn by lead-in wire, and with the insulating material isolation, be arranged on heat radiator, then be fixed on the cabinet rear portion.
By computing machine self routing motherboard circuits processed:
As shown in Figure 4, in motherboard circuits, the power panel interface is comprised of external 24V Switching Power Supply; First consists of integrated circuit U5 and the common electrical connection of UK1, connector J1, resistance R 3, resistance R K1, resistance R 6, capacitor C 6～C24 and capacitor C K1 in the sheet system; Formed with R2, capacitor C 1～C5 and the common electrical connection of lithium battery BTI by voltage stabilizer U1 and U4, connector JP1, diode D1～D6, light emitting diode LP1 and LP2, resistance R 1 with power circuit in the sheet system; Extending out RAM and battery protecting circuit consists of integrated chip U2 and the common electrical connection of U3; Crystal oscillation and reset circuit are comprised of with R5, capacitor C 25～C28, the common electrical connection of button U6 crystal oscillator U7, resistance R 4; As shown in Figure 5, the simulating signal limiter protection circuit consists of amplifier U8 and the common electrical connection of U9, voltage stabilizing chip U10, limited amplitude protection chip U11, resistance R X1～RX7, capacitor C X1～CX5 and light emitting diode L1; Solenoid valve isolation output control circuit jointly is electrically connected and forms by relay U12 and U13, triode N1 and N2, diode D7 and D8, resistance R 7, resistance R 8 and connector CAN1; As shown in Figure 6, CAN Bus isolation driving circuit consists of integrated circuit U14, high speed photo coupling U15 and U16, resistance R 9～R15, the common electrical connection of capacitor C 29～C35, connector CAN2; As shown in Figure 7, the built-in function circuit consists of toggle switch NBJ1 and the common electrical connection of resistance R 20; Liquid crystal touch screen I/O communication interface circuit consists of the common electrical connection of connector P2, resistance R 16～R17; The display board communication interface circuit consists of connector P1, resistance R 16～R19, the common electrical connection of capacitor C 36; As shown in Figure 8, the switching signal buffer circuit consists of high speed photo coupling U17～U20, resistance R 21～R25, the common electrical connection of capacitor C 38～C40; Active crystal oscillation and exiting signal generating circuit consist of with the common electrical connection of C43 active crystal oscillator Y1, signal generator U21, resistance R 26～R30, magnetic bead RL1～RL3, capacitor C 42; The precision voltage source circuit consists of voltage stabilizer U22, diode D9, capacitor C 41, the common electrical connection of capacitor C 44～C46, short-circuiting device CB1; As shown in Figure 9, described signal filtering driving circuit consists of with the common electrical connection of L3 amplifier U23 and U24, resistance R 31～R35, capacitor C 47～C58, inductance L 2; As shown in figure 10, electricity is led the trip stop transmission circuit and jointly is electrically connected and forms with U33, capacitor C A1 and CA2, capacitor C 59～C62 with R51, resistance R A1, diode D10～D14, amplifier U30 by relay U25～U29, triode N3～N7, resistance R 36～R48, resistance R 50; Conductance measurement and self calibration commutation circuit consist of the common electrical connection of relay U34, triode N8, resistance R 55, diode D15, connector ADIANDAOBO1 and ADIANDAOBI1; Electricity is led the detection interface and is consisted of connector ADIANDAO1; Electricity is led to exchange and is turned direct current and buffer circuit consists of integrated circuit U31, amplifier U30, optocoupler U32, resistance R 49, the common electrical connection of resistance R 52～R54, capacitor C 63～C69; As shown in figure 11, measuring resistance switching array circuit consists of relay UMD1～UMD5, relay UUP1～UUP5, relay U35, triode N9～N11, resistance R A2～RA23, resistance R 56～R59, diode D16～D18, the common electrical connection of amplifier U23; As shown in figure 12, the temperature change send buffer circuit to consist of amplifier U37, optocoupler U38, constant current tube U36, resistance R 60～R70, the common electrical connection of capacitor C 70～C73; The temperature detection interface consists of connector JPTAX1.
As shown in figure 13, the CAN bus consists of the common electrical connection of DC/DC power module U43, resistance R 101, capacitor C 74, capacitor C 75 and inductance L 19～L21 with insulating power supply DC/DC and filter circuit; Mainboard consists of DC/DC power module U44, resistance R 102, capacitor C 76, the common electrical connection of wave filter U45 with digital power; Mainboard consists of with LED2, resistance R 104～R113, capacitor C 78～C86 and the common electrical connection of inductance L 22 DC/DC power module U48, voltage stabilizing chip U46 and U49, wave filter U47 and U50, diode D19 and D20, LED 1 with analog power; Electricity is led with the isolation digital power and is consisted of integration module U54, resistance R 124, the common electrical connection of capacitor C 96～C97, inductance L 26～L28; Electricity is led with the isolation analog power and jointly is electrically connected and forms with LED4, resistance R 114～R123, capacitor C 87～C195, inductance L 23～L25 with D22, LED 3 by DC/DC power module U51, voltage stabilizing chip U52 and U53, diode D21;
Wherein, the optional C8051F060 of U5, the optional 74HC573 of U2, the optional 62LV1024/2568 of U3, U1, U4, the optional AS1117 series of U10, U22, the optional K9F1208 of UK1, the optional TLV2454 of U9, the optional TLE2024 of U8, U37, the optional TL7726 of U11, U43, U45, the optional IA2405 of U54; The optional IA2415KS of U48, U51, the optional LM317T of U46, U52; The optional LM337T of U49, U53, the optional 6N137 of U15～U20, the optional TJA1040 of U14; The optional TLP521-2 series of photoisolator U32, U38, the optional AD9850 series of U21, U23, UB2, U30, UB1, optional MC33274 series, the optional OPA627 of U33, the optional AD536 of U31, the optional S9013 of N1～N11, the optional 3CR series of U36, U45, U47, the optional TY110P of U50.
By computing machine self routing display board circuit processed:
As shown in figure 14, in the circuit of display board, display board and motherboard interface consist of connector P3, button RESET1, resistance R 71, resistance R 74, resistance R 75 and capacitor C D1 electrical connection; Second consists of integrated chip U39, connector J2, resistance R 72 and resistance R 73 electrical connections at the sheet circuit system; The display power supply filtering circuit consists of voltage stabilizer U40, capacitor C D2～CD8 electrical connection; As shown in figure 15, described charactron and action button and pilot lamp control circuit consist of integration slice U41, integration slice U42, resistance R 76～R100, charactron L17, charactron L18, pilot lamp L4～L16 and button S1～S12 electrical connection;
Wherein, the optional CH451 series of U41, U42, the optional C8051F330 series of U39, the optional AS1117 series of U40, the optional LN3561AS of L17 and L18.
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: 0.01 μ S～200mS; (4) fluid temperature: 0～100.0 ℃ (can show-256～460 ℃); (5) control mode: automatic or manual; (6) the online check point precision of conductivity :≤0.5%(is interior on a large scale); (7) the trip stop maximum detects retardation time :≤10 seconds.
The present invention in use, first connects alternating current 220V voltage, outside connecting valve power supply, conductance electrode (with the platinum temperature sensor), electromagnetic valve actuating gear, and the specific works step during detection is: (1) power-on; (2) transfer the internal control parameter; (3) recover normal function.The operator can in time adjust conductivity bound alarming value and get final product according to process conditions, alerting signal and recording curve afterwards, and the calibration of regularly conductance electrode being cleaned and return to zero.
the first complete machine that uses is calibrated: toggle switch is put monitoring (or liquid crystal touch screen is driven 4 locks simultaneously), and dial-up is to original canonical parameter position, to allow first in the sheet system, original canonical parameter to be delivered in power down protection RAM, then reverse code and just can accurately adjust inner parameter, the lock I button of opening to the customer parameter adjusted position, lock П button makes its corresponding pilot lamp bright, presses code and increases button to automatically calculating capacitance interval time position, presses the code value button and increases, the fast button of code value, code value subtracts button and calculates capacitance interval time, its code to adjust, code value temporarily is presented at the conductivity display window, in the parameter value display window, in like manner, adjustable excitation frequency, capacitance, electricity is led constant, temperature compensation coefficient, electricity is led zeroing, electricity is led millivolt, the temperature zeroing, low alarm limit, high alarm setting, temperature zero point, temperature slope, concentration conductivity at zero point, concentration and conductance ratio, concentration ppm value, the upper limit of concentration alarming value, the concentration limit alarming value, conductance modification zero point, the conductance modification slope, route resistance, inner self calibration lock, electric capacity calculates lock, conductivity is revised lock, filtrate conductivity ripple switch lock, crosstalk resistance switch lock, the electrode protection resistance value, the temperature lock, the internal conductance rate is preserved lock, top monitoring parameter is arranged on liquid crystal touch screen more convenient to operate directly perceived, the adjustment of electrode constant needs standard K CL damping fluid, and the temperature value adjustment needs thermometer, again toggle switch is put normal position (or close on liquid crystal touch screen 4 locks), recovered normal function, arrive this, the complete machine adjustment is complete, peripheral operation is done regular, suitable adjustment by the workman and is got final product.
Claims (6)
1. the self-compensating single-channel precision conductivity detection alarm instrument of band symmetrical lead, comprise display device and internal circuit board, it is characterized in that, described display device comprises liquid crystal touch screen, conductivity display window, parameter value display window, action button and pilot lamp; Described internal circuit board comprises motherboard and display board, and described motherboard is electrically connected by simple connector or stub cable mutually with display board; Described motherboard outside is connected with conductance electrode by symmetrical cable, and inside is connected with the measuring resistance array by symmetrical cable; Described symmetrical cable is twin-concentric cable; Liquid crystal touch screen is connected with the main frame corresponding point by stub cable, carry out data communication, conductivity display window, parameter value display window, action button and pilot lamp are fixed on display board, and by second on display board, in the sheet system, carry out button scanning and coding, charactron and pilot lamp refresh, second in the sheet system by simple connector or stub cable and the electrical connection of motherboard corresponding point, wherein reset button is connected with the motherboard corresponding point by the reset signal cable;
the circuit of described motherboard is by the general supply interface, first in the sheet system, the mainboard digital power circuit, mainboard analog power circuit, at sheet system power circuit, the simulating signal limiter protection circuit, CAN bus insulating power supply DC/DC and filter circuit, CAN Bus isolation driving circuit, solenoid valve isolation output control circuit, extend out RAM and battery protecting circuit, crystal oscillation and reset circuit, the built-in function circuit, liquid crystal touch screen I/O communication interface circuit, the display board communication interface circuit, electricity is led with the isolation digital power circuit, electricity is led with isolation simulation power circuit, the switching signal buffer circuit, the precision voltage source circuit, active crystal oscillation and exiting signal generating circuit, the signal filtering driving circuit, conductance measurement and self calibration commutation circuit, electricity is led the trip stop transmission circuit, electricity is led the detection interface, measuring resistance switching array circuit, electric conductivity value exchanges and turns direct current and buffer circuit, temperature becomes send buffer circuit, the temperature detection interface is electrically connected composition jointly,
Described active crystal oscillation is connected with switching signal buffer circuit, precision voltage source circuit and signal filtering driving circuit corresponding point by power lead, signal wire respectively with exiting signal generating circuit; Described electricity is led with the isolation digital power and is connected with switching signal buffer circuit, precision voltage source circuit respectively by power lead, and described conductance measurement is led between trip stop transmission circuit and measuring resistance switching array circuit and is connected by signal wire with self calibration commutation circuit, electricity; Described signal filtering driving circuit is connected with the self calibration commutation circuit with conductance measurement; Described electricity is led the trip stop transmission circuit and is led and detect interface, electricity and lead to exchange and turn direct current and buffer circuit is connected with electricity respectively by signal wire; Temperature becomes send buffer circuit to be connected with the temperature detection interface by signal wire; Electricity is led to exchange and is turned direct current and buffer circuit, temperature and become and send buffer circuit to be connected with the simulating signal limiter protection circuit through signal wire respectively; Described electricity is led the detection interface and is connect outside conductance electrode by twin-concentric cable; The temperature detection interface is by the accurate platinum sensor of the external four-wire system of cable; Described electricity lead with the isolation analog power respectively with signal filtering driving circuit, conductance measurement and self calibration commutation circuit, measuring resistance switching array circuit, electricity lead trip stop transmission circuit, electricity lead exchange turn direct current and buffer circuit, the temperature change send buffer circuit to be connected;
Also comprise the power panel circuit in the circuit of described motherboard, wherein, the general supply interface is led with isolation digital power, electricity and is led with corresponding point on the circuit of isolating analog power and be connected with insulating power supply DC/DC and filter circuit, solenoid valve isolation output control circuit, electricity with analog power, CAN bus with digital power, mainboard with mainboard respectively by power lead, for motherboard provides respectively separately simulation insulating power supply and digital insulating power supply; First is connected with CAN Bus isolation driving circuit, liquid crystal touch screen I/O communication interface circuit, display board communication interface circuit corresponding point respectively by data communication line in the sheet system; Described first is connected with the simulating signal limiter protection circuit by analog signal line in the sheet system, first the sheet system by switch signal line and built-in function circuit, solenoid valve isolation output control circuit, switching signal buffer circuit, conductance measurement lead the trip stop transmission circuit with self calibration commutation circuit, electricity, measuring resistance switching array circuit is connected, first the sheet system also by data line, crystal oscillation line and reset line respectively with extend out RAM and battery protecting circuit, crystal oscillation and reset circuit and be connected; Be connected in sheet system, simulating signal limiter protection circuit corresponding point with analog power, first with digital power, mainboard with mainboard respectively with the digital power line by the analog power line with power circuit in the sheet system, analog power and the digital power of high-quality is provided for the system core;
The circuit of described display board is comprised of in sheet circuit system, display power supply filtering circuit, charactron and action button and the common electrical connection of pilot lamp control circuit display board and motherboard interface, second;
Described display power supply filtering circuit is connected with motherboard with the motherboard interface through display board, obtains power supply and to second, in sheet circuit system, charactron and action button and pilot lamp control circuit, powers; Second at the sheet circuit system through display board and motherboard interface and motherboard communications exchange data, and with charactron, with action button, with the pilot lamp control circuit, by inner synchronous serial line, be connected, button is scanned and encodes, the output data are used for refreshing charactron and pilot lamp.
2. conductivity detection alarm instrument according to claim 1, is characterized in that, in described motherboard circuits, the general supply interface is comprised of external 24V Switching Power Supply; First consists of integrated circuit U5 and the common electrical connection of UK1, connector J1, resistance R 3, resistance R K1, resistance R 6, capacitor C 6～C24 and capacitor C K1 in the sheet system; Formed with R2, capacitor C 1～C5 and the common electrical connection of lithium battery BTI by voltage stabilizer U1 and U4, connector JP1, diode D1～D6, light emitting diode LP1 and LP2, resistance R 1 with power circuit in the sheet system; Extending out RAM and battery protecting circuit consists of integrated chip U2 and the common electrical connection of U3; Crystal oscillation and reset circuit are comprised of with R5, capacitor C 25～C28, the common electrical connection of button U6 crystal oscillator U7, resistance R 4; The simulating signal limiter protection circuit consists of amplifier U8 and the common electrical connection of U9, voltage stabilizing chip U10, limited amplitude protection chip U11, resistance R X1～RX7, capacitor C X1～CX5 and light emitting diode L1; Solenoid valve isolation output control circuit jointly is electrically connected and forms by relay U12 and U13, triode N1 and N2, diode D7 and D8, resistance R 7, resistance R 8 and connector CAN1; CAN Bus isolation driving circuit consists of integrated circuit U14, high speed photo coupling U15 and U16, resistance R 9～R15, the common electrical connection of capacitor C 29～C35, connector CAN2; The built-in function circuit consists of toggle switch NBJ1 and the common electrical connection of resistance R 20; Liquid crystal touch screen I/O communication interface circuit consists of the common electrical connection of connector P2, resistance R 16～R17; The display board communication interface circuit consists of connector P1, resistance R 16～R19, the common electrical connection of capacitor C 36; The switching signal buffer circuit consists of high speed photo coupling U17～U20, resistance R 21～R25, the common electrical connection of capacitor C 38～C40; Active crystal oscillation and exiting signal generating circuit consist of with the common electrical connection of C43 active crystal oscillator Y1, signal generator U21, resistance R 26～R30, magnetic bead RL1～RL3, capacitor C 42; The precision voltage source circuit consists of voltage stabilizer U22, diode D9, capacitor C 41, the common electrical connection of capacitor C 44～C46, short-circuiting device CB1; The signal filtering driving circuit consists of with the common electrical connection of L3 amplifier U23 and U24, resistance R 31～R35, capacitor C 47～C58, inductance L 2; Electricity is led the trip stop transmission circuit and is consisted of with R51, resistance R A1, diode D10～D14, amplifier U30 and U33, capacitor C A1 and the common electrical connection of CA2, capacitor C 59～C62 relay U25～U29, triode N3～N7, resistance R 36～R48, resistance R 50; Conductance measurement and self calibration commutation circuit consist of the common electrical connection of relay U34, triode N8, resistance R 55, diode D15, connector ADIANDAOBO1 and ADIANDAOBI1; Electricity is led the detection interface and is consisted of connector ADIANDAO1; Electricity is led to exchange and is turned direct current and buffer circuit consists of integrated circuit U31, amplifier U30, optocoupler U32, resistance R 49, the common electrical connection of resistance R 52～R54, capacitor C 63～C69; Measuring resistance switching array circuit consists of relay UMD1～UMD5, relay UUP1～UUP5, relay U35, triode N9～N11, resistance R A2～RA23, resistance R 56～R59, diode D16～D18, the common electrical connection of amplifier U23; Temperature becomes send buffer circuit to consist of amplifier U37, optocoupler U38, constant current tube U36, resistance R 60～R70, the common electrical connection of capacitor C 70～C73; The temperature detection interface consists of connector JPTAX1.
3. conductivity detection alarm instrument according to claim 2, it is characterized in that, described CAN bus consists of the common electrical connection of DC/DC power module U43, resistance R 101, capacitor C 74, capacitor C 75 and inductance L 19～L21 with insulating power supply DC/DC and filter circuit; Mainboard consists of DC/DC power module U44, resistance R 102, capacitor C 76, the common electrical connection of wave filter U45 with digital power circuit; Mainboard consists of with LED2, resistance R 104～R113, capacitor C 78～C86 and the common electrical connection of inductance L 22 DC/DC power module U48, voltage stabilizing chip U46 and U49, wave filter U47 and U50, diode D19 and D20, LED 1 with the analog power circuit; Electricity is led with the isolation digital power circuit and is consisted of integration module U54, resistance R 124, the common electrical connection of capacitor C 96～C97, inductance L 26～L28; Electricity is led with isolation simulation power circuit and jointly is electrically connected and forms with LED4, resistance R 114～R123, capacitor C 87～C195, inductance L 23～L25 with D22, LED 3 by DC/DC power module U51, voltage stabilizing chip U52 and U53, diode D21.
4. conductivity detection alarm instrument according to claim 2, is characterized in that, in the circuit of described display board, display board and motherboard interface consist of connector P3, button RESET1, resistance R 71, resistance R 74, resistance R 75 and capacitor C D1 electrical connection; Second consists of integrated chip U39, connector J2, resistance R 72 and resistance R 73 electrical connections at the sheet circuit system; The display power supply filtering circuit consists of voltage stabilizer U40, capacitor C D2～CD8 electrical connection; Described charactron and action button and pilot lamp control circuit consist of integration slice U41, integration slice U42, resistance R 76～R100, charactron L17, charactron L18, pilot lamp L4～L16 and button S1～S12 electrical connection.
5. conductivity detection alarm instrument according to claim 1, is characterized in that, the analog power on described motherboard and digital power are provided with analog power with digital power and mainboard by mainboard respectively; Liquid crystal touch screen I/O communication interface circuit is provided by the outside connected switch power supply separately; The digital power that the display board communication interface uses is provided with digital power by mainboard; Described motherboard is led with the isolation digital power and is provided power supply for switching signal buffer circuit and precision voltage source circuit by electricity; Described motherboard is led and is led trip stop transmission circuit, measuring resistance switching array circuit, electricity with the isolation analog power for signal filtering driving circuit, conductance measurement and self calibration commutation circuit, electricity and lead to exchange and turn direct current and buffer circuit and temperature change and send buffer circuit that the isolation analog power is provided by electricity; The isolation digital power that CAN Bus isolation driving circuit uses is provided with insulating power supply DC/DC and filter circuit by the CAN bus.
6. conductivity detection alarm instrument according to claim 1, it is characterized in that, described action button comprises that button, parameter are set to be increased button, the fast button of parameter, parameter and subtract button, reset button, code and increase that button, code value increase button, code value subtracts button, parameter save button, one-shot switch, internal calibration button, lock I button and lock П button; Described pilot lamp comprises calibration pilot lamp, temperature indicator, penalty coefficient pilot lamp, electrode constant pilot lamp, the fast pilot lamp of parameter, preserves pilot lamp, single measurement pilot lamp, lock I pilot lamp, lock П pilot lamp, tracking measurement pilot lamp, internal calibration pilot lamp, μ S pilot lamp, mS pilot lamp and alarm lamp.
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| CN201110174145XA CN102279319B (en) | 2011-06-24 | 2011-06-24 | Self-compensating single-way precise conductivity detection alarm with symmetrical leads |
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| CN202133719U (en) * | 2011-06-24 | 2012-02-01 | 华南理工大学 | Single-channel precision conductivity detection alarm instrument with symmetrical lead self-compensating function |
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| US3992662A (en) * | 1974-08-16 | 1976-11-16 | Billy D. Etherton | Liquid conductivity measuring device |
| US4303887A (en) * | 1979-10-29 | 1981-12-01 | United States Surgical Corporation | Electrical liquid conductivity measuring system |
| CN2867343Y (en) * | 2006-01-19 | 2007-02-07 | 南京师范大学 | High-density nitric acid density conductivity formula online measuring apparatus |
| CN201174056Y (en) * | 2008-03-25 | 2008-12-31 | 华南理工大学 | Double-loop intelligent pH value measuring and controlling device having CAN bus |
| CN201196826Y (en) * | 2008-03-25 | 2009-02-18 | 华南理工大学 | Double-glass electrode acidity-basicity detection alarm device with CAN bus |
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