CN202133719U - Single-channel precision conductivity detection alarm instrument with symmetrical lead self-compensating function - Google Patents
Single-channel precision conductivity detection alarm instrument with symmetrical lead self-compensating function Download PDFInfo
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- CN202133719U CN202133719U CN201120218819U CN201120218819U CN202133719U CN 202133719 U CN202133719 U CN 202133719U CN 201120218819 U CN201120218819 U CN 201120218819U CN 201120218819 U CN201120218819 U CN 201120218819U CN 202133719 U CN202133719 U CN 202133719U
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Abstract
The utility model discloses a single-channel precision conductivity detection alarm instrument with a symmetrical lead self-compensating function, comprising a display device and a built-in circuit board; wherein the display device comprises a liquid crystal touch screen, a display window, operational buttons and indicating lamps; and the built-in circuit board comprises a mother board and a display board which are connected electrically. The single-channel precision conductivity detection alarm instrument of the utility model is used for detecting and monitoring the conductivity in real time, and has the advantages of high measuring precision, reliable work, comprehensive anti-interference capacity, convenient operation, high automation degree, high intelligence degree, convenient manufacture and maintenance, low manufacturing cost, etc.
Description
Technical field
The utility model belongs to the online detection range of chemical process parameter, relates to the little sugar part online indirect detection device in sugar refinery, is specifically related to a kind of accurate conductivity of the self-compensating single channel of symmetrical lead of being with and detects monitor.
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 conductive materials through suitable reactor into, and then measures the variation size of reaction front and back conductivity, thereby through calculating its concentration; In addition, also have one and half electrolyte, under high frequency pumping, its concentration is also closely related with conductivity; These carry out the occasion of other parameter detecting as intermediate variable with conductivity; All need a kind of stable, accurate conductivity pick-up unit; And the electric conductivity detector of domestic manufacturer's production at present; Generally all come manually calibrating conductivity meter, use comparatively trouble, and automaticity is low through resistance box; Do not consider that perhaps lead to the influence 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 from the equipment of external import mostly cost an arm and a leg, maintenance maintenance difficulty.
Summary of the invention
The purpose of the utility model is exactly the weak point that exists in the above-mentioned prior art in order to solve, and provides a kind of accurate conductivity of the self-compensating single channel of symmetrical lead of being with to detect monitor.External symmetry lead and inner per mille accuracy standard resistance way of combining in the utility model adopts; Have that measuring accuracy height, reliability are high, function is many, cost is low, intelligent degree is high, manufacturing is easy to maintenance, can with advantages such as miscellaneous equipment networking, good energy-conserving effect; Lead the electrode of constant except that connecting various electricity; Traditional excitation frequency that also can compatible general conductivity meter, low all 70Hz, high all 1100Hz, and the excitation frequency of superelevation week 10KHz, 100KHz can be provided.
The purpose of the utility model realizes through following technical scheme:
A kind of accurate conductivity detection alarm of the self-compensating single channel of symmetrical lead appearance of being with comprises display device and internal circuit board, and as shown in Figure 1, said 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 through simple connector or stub cable with display board mutually, and motherboard is outside to be connected with conductance electrode through symmetrical cable, and the inner symmetrical cable that passes through is connected with the measuring resistance array; Symmetrical cable is a twin-concentric cable; Liquid crystal touch screen is connected with the main frame corresponding point through stub cable; Carry out data communication; Conductivity display window, parameter value display window, action button and pilot lamp are fixed on the display board; And carry out button scanning and coding, charactron and pilot lamp refresh at chip system through second on the display board, and second is electrically connected through simple connector or stub cable and motherboard corresponding point at chip system, and wherein SR is connected with the motherboard corresponding point through the reset signal cable;
As shown in Figure 2, the circuit of said motherboard by the general supply interface, first chip system, mainboard with digital power circuit, mainboard with the analog power circuit, chip system with power circuit, simulating signal limiter protection circuit, CAN bus with insulating power supply DC/DC and filter circuit, CAN bus isolated drive circuit, solenoid valve isolate output control circuit, extend out RAM and battery protecting circuit, crystal oscillation and reset circuit, built-in function circuit, liquid crystal touch screen I/O communication interface circuit, display board communication interface circuit, electricity lead with isolating digital power circuit, electricity and lead with isolating simulation power circuit, switching signal buffer circuit, precision voltage source circuit, active crystal oscillation and exiting signal generating circuit, signal filtering driving circuit, conductance measurement and self calibration commutation circuit, electricity and lead trip stop transmission circuit, electricity and lead detection interface, measuring resistance switching array circuit, electric conductivity value and exchange commentaries on classics direct current and buffer circuit, temperature change and send buffer circuit, temperature detection interface to be electrically connected jointly to form;
As shown in Figure 3, the circuit of display board is electrically connected at chip system circuit, display power supply filtering circuit, charactron and action button and pilot lamp control circuit by display board and motherboard interface, second jointly to be formed.
As shown in Figure 4, in the said motherboard circuit of the utility model, the power panel interface is made up of external 24V Switching Power Supply; First is electrically connected jointly by integrated circuit U5 and UK1, connector J1, resistance R 3, resistance R K1, resistance R 6, capacitor C 6～C24 and capacitor C K1 at chip system and constitutes; Be electrically connected jointly with R2, capacitor C 1～C5 and 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 at chip system and constitute; Extending out RAM and battery protecting circuit is electrically connected jointly by integrated chip U2 and U3 and constitutes; Crystal oscillation and reset circuit are electrically connected with R5, capacitor C 25～C28, button U6 by crystal oscillator U7, resistance R 4 jointly to be formed; As shown in Figure 5, the simulating signal limiter protection circuit is electrically connected jointly by amplifier U8 and U9, voltage stabilizing chip U10, limited amplitude protection chip U11, resistance R X1～RX7, capacitor C X1～CX5 and light emitting diode L1 and constitutes; Solenoid valve isolation output control circuit is electrically connected jointly by relay U12 and U13, triode N1 and N2, diode D7 and D8, resistance R 7, resistance R 8 and connector CAN1 and constitutes; As shown in Figure 6, CAN bus isolated drive circuit is electrically connected jointly by integrated circuit U14, high speed photo coupling U15 and U16, resistance R 9～R15, capacitor C 29～C35, connector CAN2 and constitutes; As shown in Figure 7, the built-in function circuit is electrically connected jointly by toggle switch NBJ1 and resistance R 20 and constitutes; Liquid crystal touch screen I/O communication interface circuit is electrically connected jointly by connector P2, resistance R 16～R17 and constitutes; Display board communication interface circuit is electrically connected jointly by connector P1, resistance R 16～R19, capacitor C 36 and constitutes; As shown in Figure 8, the switching signal buffer circuit is electrically connected jointly by high speed photo coupling U 17～U20, resistance R 21～R25, capacitor C 38～C40 and constitutes; Active crystal oscillation and exiting signal generating circuit are electrically connected jointly with C43 by active crystal oscillator Y1, signal generator U21, resistance R 26～R30, magnetic bead RL1～RL3, capacitor C 42 and constitute; The precision voltage source circuit is electrically connected jointly by voltage stabilizer U22, diode D9, capacitor C 41, capacitor C 44～C46, short-circuiting device CB1 and constitutes; As shown in Figure 9, the signal filtering driving circuit is electrically connected jointly with L3 by amplifier U23 and U24, resistance R 31～R35, capacitor C 47～C58, inductance L 2 and constitutes; Shown in figure 10, electricity is led the trip stop transmission circuit and is electrically connected jointly with R51, resistance R A1, diode D10～D14, amplifier U30 and U33, capacitor C A1 and CA2, capacitor C 59～C62 by relay U25～U29, triode N3～N7, resistance R 36～R48, resistance R 50 and constitutes; Conductance measurement and self calibration commutation circuit are electrically connected jointly by relay U34, triode N8, resistance R 55, diode D15, connector ADIANDAOBO1 and ADIANDAOBI1 and constitute; Electricity is led the detection interface and is made up of connector ADIANDAO1; Electricity is led and exchange to be changeed direct current and buffer circuit and be electrically connected jointly by integrated circuit U31, amplifier U30, optocoupler U32, resistance R 49, resistance R 52～R54, capacitor C 63～C69 and constitute; Shown in figure 11, measuring resistance switching array circuit is electrically connected jointly by relay UMD1～UMD5, relay UUP1～UUP5, relay U35, triode N9～N11, resistance R A2～RA23, resistance R 56～R59, diode D16～D18, amplifier U23 and constitutes; Shown in figure 12, temperature becomes to be sent buffer circuit to be electrically connected jointly by amplifier U37, optocoupler U38, constant current tube U36, resistance R 60～R70, capacitor C 70～C73 to constitute; The temperature detection interface is made up of connector JPTAX1.
Shown in figure 13, the CAN bus is electrically connected jointly by 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 and constitutes; Mainboard is electrically connected jointly by DC/DC power module U44, resistance R 102, capacitor C 76, wave filter U45 with the digital power circuit and constitutes; Mainboard is electrically connected jointly with LED2, resistance R 104～R113, capacitor C 78～C86 and inductance L 22 by 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 and constitutes; Electricity is led with isolating the digital power circuit and is electrically connected jointly by integration module U54, resistance R 124, capacitor C 96～C97, inductance L 26～L28 and constitutes; Electricity is led with isolating the simulation power circuit and is electrically connected jointly by DC/DC power module U51, voltage stabilizing chip U52 and U53, diode D21 and D22, LED 3 and LED4, resistance R 114～R123, capacitor C 87～C195, inductance L 23～L25 and constitutes.
Shown in figure 14, in the circuit of the said display board of the utility model, display board and motherboard interface are electrically connected by connector P3, button RESET1, resistance R 71, resistance R 74, resistance R 75 and capacitor C D1 and constitute; Second is electrically connected by integrated chip U39, connector J2, resistance R 72 and resistance R 73 at the chip system circuit and constitutes; The display power supply filtering circuit is electrically connected and is constituted by voltage stabilizer U40, capacitor C D2～CD8; Shown in figure 15, charactron and action button and pilot lamp control circuit are electrically connected and are constituted by integrated U41, integrated U42, resistance R 76～R100, charactron L17, charactron L18, pilot lamp L4～L16 and button S1～S12.
Also comprise the power panel circuit in the circuit of the said motherboard of the utility model; The power panel interface through power lead respectively with mainboard with digital power, mainboard with analog power, CAN bus with insulating power supply DC/DC and filter circuit, solenoid valve isolate output control circuit, electricity lead with isolate digital power, electricity is led with corresponding point on the circuit of isolating analog power and is connected, for motherboard provides separately simulation insulating power supply and digital insulating power supply respectively; First is connected with CAN bus isolated drive circuit, liquid crystal touch screen I/O communication interface circuit, display board communication interface circuit corresponding point respectively through data communication line at chip system; First is connected with the simulating signal limiter protection circuit through analog signal line at chip system; First isolates through switch signal line and built-in function circuit, solenoid valve at chip system that output control circuit, switching signal buffer circuit, conductance measurement are led the trip stop transmission circuit with self calibration commutation circuit, electricity, measuring resistance switching array circuit is connected, first chip system also through 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 chip system, simulating signal limited amplitude protection switch switching circuit corresponding point with analog power, first with mainboard with digital power with mainboard respectively with the digital power line through the analog power line with power circuit at chip system, the analog power and the digital power of high-quality is provided for the system core.
The said active crystal oscillation of the utility model is connected with switching signal buffer circuit, precision voltage source circuit and signal filtering driving circuit corresponding point through power lead, signal wire respectively with exiting signal generating circuit; Conductance measurement is led between trip stop transmission circuit and the measuring resistance switching array circuit with self calibration commutation circuit, electricity and is connected through signal wire; Electricity is led the trip stop transmission circuit and is led with electricity respectively through signal wire and detect interface, electricity and lead and exchanges the commentaries on classics direct current and buffer circuit is connected; Temperature becomes send buffer circuit to be connected with the temperature detection interface through signal wire; Electricity is led and exchange to be changeed direct current and buffer circuit, temperature and become and send buffer circuit to be connected with simulating signal limited amplitude protection switch switching circuit through signal wire respectively; Electricity is led the detection interface and is connect the external electric conductive electrode through twin-concentric cable; The temperature detection interface is through the accurate platinum sensor of the external four-wire system of cable.
Analog power and digital power on the said mainboard of the utility model 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 display board communication interface circuit uses is provided with digital power by mainboard; Motherboard is led through electricity and is used the isolation digital power as switching signal buffer circuit and precision voltage source circuit power supply to be provided; Motherboard is led to use through electricity and is isolated analog power and lead trip stop transmission circuit, measuring resistance switching array circuit, electricity as signal filtering driving circuit, conductance measurement and self calibration commutation circuit, electricity and lead and exchanges commentaries on classics direct current and buffer circuit and temperature change and send buffer circuit that the isolation analog power is provided; The isolation digital power that CAN bus isolated drive circuit uses is provided with insulating power supply DC/DC and filter circuit by the CAN bus.
In the circuit of the said display board of the utility model, the display power supply filtering circuit is connected with motherboard with the motherboard interface through display board, obtains power supply and also refers to supply power with the pilot lamp control circuit in chip system circuit, charactron and action button to second; Second at the chip system circuit through display board and motherboard interface and motherboard communications exchange data; And be connected through inner synchronous serial line with the pilot lamp control circuit with action button with charactron, button is scanned and encodes, is used to refresh charactron and pilot lamp to output data.
The said action button of the utility model comprises that button, parameter are set to be increased button, the fast button of parameter, parameter and subtract button, SR, 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 ∏ button; Said 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 ∏ pilot lamp, tracking measurement pilot lamp, internal calibration pilot lamp, μ S pilot lamp, mS pilot lamp and alarm lamp.
The principle of work of the utility model is following:
(1) the temperature millivolt signal is held in the excitation constant current by four-wire system RTD subsidiary on the electrode and produces, and millivolt signal connects on the motherboard through cable connector;
(2) it is following 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; After low-pass filter filtering, remove high-frequency harmonic and amplify and drive; This signal is used to encourage tested electricity to lead; The electric current that electricity is led big more generation is just big more, and current amplifier amplifies, after the filtering, gets into ac/dc effective value converter and produce with electricity and leads the linear DC voltage of size this electric current subsequently; After the simulating signal limiter protection circuit is isolated, send into main frame again, realize measuring the redirect of gear through the size of controlled change current feedback resistance;
(3) temperature signal and the conductance signal that produce respectively through said process get into 16 accuracy A of two-way/D transducer ports, and entering is carried out calculation process at the chip system circuit;
(4) after treatment each signal; First via signal is sent to display board on second in the internal RAM of chip system circuit at chip system with the mode of communicating interrupt by first; Second refreshes charactron and pilot lamp at the chip system circuit according to digital coding successively then; Promptly refresh conductivity display window, parameter value display window, calibration pilot lamp, temperature indicator, penalty coefficient lamp, electrode constant lamp, the fast pilot lamp of parameter in real time, preserve pilot lamp, single measurement pilot lamp, lock I pilot lamp, lock ∏ pilot lamp, tracking measurement pilot lamp, internal calibration pilot lamp, μ S pilot lamp, mS pilot lamp, alarm lamp, and realize sound and light alarm through external alarm;
(5) the be provided with button, parameter on the display board increases button, the fast button of parameter, parameter and subtract button, code and increase button, code value and increase button, code value and subtract button, parameter save button, one-shot switch, lock I button, lock ∏ button and behind scanning of chip system circuit and coding, also be sent to first at chip system with the mode of communicating interrupt by second: the SR on the display board is provided with separately and is connected on other circuit board; Except that monitor code and code value with the mode that combines, all above-mentioned I/O data are all carried out data in real time exchange at chip system with the 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 chip system in the EEPROM, and the computing variable is temporarily stored in first the RAM in chip system; Part is remembered parameter and is stored in and extends out in RAM and the battery protecting circuit;
(7) during internal control, can watch and adjust related parameter is respectively arranged; During peripheral operation; Each parameter is presented on the parameter value in real time, and is corresponding indicated value according to calibration pilot lamp, temperature indicator, penalty coefficient pilot lamp, its parameter value of electrode constant pilot lamp prompting, and the handoff functionality between the pilot lamp is realized by button is set; Can make indicator light cycle move to each corresponding point; Its respective value can increase button through parameter, parameter subtracts button adjustment, through 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 corresponding parameters quickly;
(8) first carry out the communication between corresponding interface and agreement at chip system through CAN bus isolated drive circuit, and the switch of solenoid valve is isolated output control circuit through solenoid valve and connected the 24V switch electromagnetic valve again and accomplish; The unit of conductivity is represented that by μ S pilot lamp, mS pilot lamp when last 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; When pushing the internal calibration button, the internal calibration pilot lamp is bright, and conductivity measurements remains unchanged; Conductivity detection alarm appearance inside is connected on the 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;
When (9) normally measuring, the tracking measurement pilot lamp is bright, and the single measurement pilot lamp goes out; Machine is accomplished the measurement of trip stopping automatically; After pushing one-shot switch, the tracking measurement pilot lamp goes out, and the single measurement pilot lamp is bright; Machine is accomplished detailed measurement, and obtains the capacitance and the pure conductivity of detected solution and electrode system;
(10) when system need adjust the internal control parameter; Difference pressing lock I button, lock ∏ button; Make lock I pilot lamp simultaneously bright with lock ∏ pilot lamp; At this moment, conductivity display window and parameter value display window change into and show internal code value and corresponding code thereof, increase button, code value through code and increase that button, code value subtract button, the fast button of parameter can accurately be adjusted each inner parameter; In any case, push the parameter save button, it is bright to preserve pilot lamp, and all parameters obtain preserving; When system occurs all can pushing SR when undesired, make machine warm start again, with enabling.
The utility model 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 through adopting symmetrical compensation electric wire and the method that per mille precision resistance combines, the electricity that has solved the self calibration generation is well led the precision problem of correction card; Temperature measurement accuracy is high, has adopted the accurate RTD 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 promptly 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; Through the certain resistance of outer electrode serial connection, can guard amplifier avoid short circuit and destroy, can adapt to electrode constant again and be respectively 10.0,1.0,0.1,0.01 etc. different electrodes; Except that traditional excitation frequency that low all 70Hz, high all 1100Hz are provided; Superelevation week 10KHz, two kinds of frequencies of superelevation week 100KHz also are provided, install every kind of frequency is built table separately, start or reset after call in this conductivity table automatically;
(3) function is many, through the adjustment of electrode constant, can connect various standards and off-gauge conductance electrode and use; 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 the switch ultrasonic cleaner cleans electrode when also having one the tunnel to be used for manual switching measurement/cleaning state;
(5) workability is reliably high, adopts comprehensive Anti-Jamming Technique, and electricity is led driving power and adopted the OPA552 amplifier; Has self-protection function; Electricity is led and is detected input stage employing OPA627 amplifier, and 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 parameter setting changes by button or touch-screen to be adjusted, and be retained in the 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; When breaking down like communication isolation drive module, 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 accomplished by the technician; Peripheral operation does regularly by the workman that adjustment get final product, and the operator is according to process conditions, alerting signal and recording curve, in time adjusts conductivity warning upper and lower limit and do regularly to electrode that cleaning gets final product; The menu Chinese character prompting is arranged on the liquid crystal touch screen, and all data all can increase or reduce intuitively;
(7) automaticity is high; Owing to adopted inside and outside symmetrical compensation lead; 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, again temperature and electric capacity are compensated and obtain various conductivity;
(8) intelligent degree is high, and inner parameter all has default value, is adjusted in internal control by the technician to get final product, and multinomial warning function is arranged, and is convenient to help the reason of failure judgement and the position at place;
(9) available simple connector or stub cable connect between the circuit board of the utility model, manufacturing, easy to maintenance, and cost is low; Cabinet in the employing, the complete machine radiating condition is good, and cabinet is hermetically sealed; Can exempt dust, moisture intrusion; Adopt traditional high bright charactron, pilot lamp and gently melt type button and modern liquid crystal touch screen duplex and usefulness, good looking appearance, easy to operate;
(10) anti-deadlock function, the every place that circulation is arranged and possibly cause deadlock of native system program, inside adds counter, ultra scope is jumped out automatically, the system design surplus is bigger, can be in 220V ± 30% scope operate as normal.
Description of drawings
Fig. 1 is the contour structures synoptic diagram of the detection alarm appearance of the utility model.
Fig. 2 is the motherboard electrical block diagram of the detection alarm appearance of the utility model.
Fig. 3 is the display board circuit structural representation of the detection alarm appearance of the utility model.
Fig. 4 for first in the motherboard circuit of the detection alarm appearance of the utility model chip system, chip system with power circuit, extend out the schematic diagram of RAM and battery protecting circuit, crystal oscillation and reset circuit.
Fig. 5 is the schematic diagram that simulating signal limiter protection circuit and the solenoid valve in the motherboard circuit of detection alarm appearance of the utility model isolated output control circuit.
Fig. 6 is the schematic diagram of the CAN bus isolated drive circuit in the motherboard circuit of detection alarm appearance of the utility model.
Fig. 7 is built-in function circuit, the liquid crystal touch screen I/O communication interface circuit in the motherboard circuit of detection alarm appearance of the utility model, 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 circuit of detection alarm appearance of the utility model, the schematic diagram of precision voltage source circuit.
Fig. 9 is the schematic diagram of the signal filtering driving circuit in the motherboard circuit of detection alarm appearance of the utility model.
Figure 10 for the electricity in the motherboard circuit of the detection alarm appearance of the utility model lead trip stop transmission circuit, conductance measurement lead with self calibration commutation circuit, electricity detect interface, electricity is led the schematic diagram that exchanges commentaries on classics direct current and buffer circuit.
Figure 11 is the schematic diagram of the measuring resistance switching array circuit in the motherboard circuit of detection alarm appearance of the utility model.
Figure 12 becomes the schematic diagram that send buffer circuit for the temperature in the motherboard circuit of the detection alarm appearance of the utility model.
Figure 13 for the CAN bus in the motherboard circuit of the detection alarm appearance of the utility model with insulating power supply DC/DC and filter circuit, mainboard with digital power circuit, mainboard with analog power circuit, electricity lead with isolate the digital power circuit, electricity is led and is used isolation to simulate the schematic diagram of power circuit.
Figure 14 is display board and motherboard interface, second schematic diagram at chip system circuit, display power supply filtering circuit in the display board circuit of detection alarm appearance of the utility model.
Figure 15 is charactron and the schematic diagram of action button and pilot lamp control circuit in the display board circuit of detection alarm appearance of the utility model.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the utility model is done further to specify, but the utility model is not limited in this.
As shown in Figure 1; The utility model 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 is installed on the heat radiator with the insulating material isolation, is fixed on the cabinet rear portion again.
By computing machine self routing system motherboard circuit:
As shown in Figure 4, in the motherboard circuit, the power panel interface is made up of external 24V Switching Power Supply; First is electrically connected jointly by integrated circuit U5 and UK1, connector J1, resistance R 3, resistance R K1, resistance R 6, capacitor C 6～C24 and capacitor C K1 at chip system and constitutes; Be electrically connected jointly with R2, capacitor C 1～C5 and 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 at chip system and constitute; Extending out RAM and battery protecting circuit is electrically connected jointly by integrated chip U2 and U3 and constitutes; Crystal oscillation and reset circuit are electrically connected with R5, capacitor C 25～C28, button U6 by crystal oscillator U7, resistance R 4 jointly to be formed; As shown in Figure 5, the simulating signal limiter protection circuit is electrically connected jointly by amplifier U8 and U9, voltage stabilizing chip U10, limited amplitude protection chip U11, resistance R X1～RX7, capacitor C X1～CX5 and light emitting diode L1 and constitutes; Solenoid valve isolation output control circuit is electrically connected jointly by relay U12 and U13, triode N1 and N2, diode D7 and D8, resistance R 7, resistance R 8 and connector CAN1 and constitutes; As shown in Figure 6, CAN bus isolated drive circuit is electrically connected jointly by integrated circuit U14, high speed photo coupling U15 and U16, resistance R 9～R15, capacitor C 29～C35, connector CAN2 and constitutes; As shown in Figure 7, the built-in function circuit is electrically connected jointly by toggle switch NBJ1 and resistance R 20 and constitutes; Liquid crystal touch screen I/O communication interface circuit is electrically connected jointly by connector P2, resistance R 16～R17 and constitutes; Display board communication interface circuit is electrically connected jointly by connector P1, resistance R 16～R19, capacitor C 36 and constitutes; As shown in Figure 8, the switching signal buffer circuit is electrically connected jointly by high speed photo coupling U17～U20, resistance R 21～R25, capacitor C 38～C40 and constitutes; Active crystal oscillation and exiting signal generating circuit are electrically connected jointly with C43 by active crystal oscillator Y1, signal generator U21, resistance R 26～R30, magnetic bead RL1～RL3, capacitor C 42 and constitute; The precision voltage source circuit is electrically connected jointly by voltage stabilizer U22, diode D9, capacitor C 41, capacitor C 44～C46, short-circuiting device CB1 and constitutes; As shown in Figure 9, said signal filtering driving circuit is electrically connected jointly with L3 by amplifier U23 and U24, resistance R 31～R35, capacitor C 47～C58, inductance L 2 and constitutes; Shown in figure 10, electricity is led the trip stop transmission circuit and is electrically connected jointly with R51, resistance R A1, diode D10～D14, amplifier U30 and U33, capacitor C A1 and CA2, capacitor C 59～C62 by relay U25～U29, triode N3～N7, resistance R 36～R48, resistance R 50 and constitutes; Conductance measurement and self calibration commutation circuit are electrically connected jointly by relay U34, triode N8, resistance R 55, diode D15, connector ADIANDAOBO1 and ADIANDAOBI1 and constitute; Electricity is led the detection interface and is made up of connector ADIANDAO1; Electricity is led and exchange to be changeed direct current and buffer circuit and be electrically connected jointly by integrated circuit U31, amplifier U30, optocoupler U32, resistance R 49, resistance R 52～R54, capacitor C 63～C69 and constitute; Shown in figure 11, measuring resistance switching array circuit is electrically connected jointly by relay UMD1～UMD5, relay UUP1～UUP5, relay U35, triode N9～N11, resistance R A2～RA23, resistance R 56～R59, diode D16～D18, amplifier U23 and constitutes; Shown in figure 12, temperature becomes to be sent buffer circuit to be electrically connected jointly by amplifier U37, optocoupler U38, constant current tube U36, resistance R 60～R70, capacitor C 70～C73 to constitute; The temperature detection interface is made up of connector JPTAX1.
Shown in figure 13, the CAN bus is electrically connected jointly by 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 and constitutes; Mainboard is electrically connected jointly by DC/DC power module U44, resistance R 102, capacitor C 76, wave filter U45 with digital power and constitutes; Mainboard is electrically connected jointly with LED2, resistance R 104～R113, capacitor C 78～C86 and inductance L 22 by 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 and constitutes; Electricity is led with isolating digital power and is electrically connected jointly by integration module U54, resistance R 124, capacitor C 96～C97, inductance L 26～L28 and constitutes; Electricity is led with isolating analog power and is electrically connected jointly by DC/DC power module U51, voltage stabilizing chip U52 and U53, diode D21 and D22, LED 3 and LED4, resistance R 114～R123, capacitor C 87～C195, inductance L 23～L25 and constitutes;
Wherein, the optional C8051F060 of U5, the optional 74HC573 of U2, the optional 62LV1024/2568 of U3; U1, U4, U10, the optional AS1117 series of U22, the optional K9F1208 of UK1, the optional TLV2454 of U9; U8, the optional TLE2024 of U37, the optional TL7726 of U11, U43, U45, the optional IA2405 of U54; U48, the optional IA2415KS of U51, U46, the optional LM317T of U52; U49, the optional LM337T of U53, the optional 6N137 of U15～U20, the optional TJA1040 of U14; Photoisolator U32, the optional TLP521-2 series of 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 system display board circuit:
Shown in figure 14, in the circuit of display board, display board and motherboard interface are electrically connected by connector P3, button RESET1, resistance R 71, resistance R 74, resistance R 75 and capacitor C D1 and constitute; Second is electrically connected by integrated chip U39, connector J2, resistance R 72 and resistance R 73 at the chip system circuit and constitutes; The display power supply filtering circuit is electrically connected and is constituted by voltage stabilizer U40, capacitor C D2～CD8; Shown in figure 15, said charactron and action button and pilot lamp control circuit are electrically connected and are constituted by integrated U41, integrated U42, resistance R 76～R100, charactron L17, charactron L18, pilot lamp L4～L16 and button S1～S12;
Wherein, U41, the optional CH451 series of 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 the embodiment of the utility model are following: (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% (on a large scale); (7) the trip stop maximum detects retardation time :≤10 seconds.
The utility model connects alternating current 220V voltage, outside Switching Power Supply, conductance electrode (with the platinum temperature sensor), the electromagnetic valve actuating gear of connecting earlier in use, and the concrete job 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.
First use the complete machine calibration: 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 let first to deliver to original canonical parameter in the power down protection RAM at chip system; Dialling back sign indicating number then just can accurate adjustment inner parameter to customer parameter adjustment position; The lock I button of opening, lock ∏ button make its corresponding pilot lamp bright; Push code and increase button to calculating capacitance interval time position automatically; Push that the code value button increases, the fast button of code value, code value subtract button and calculate the capacitance interval time with adjustment; Its code, code value temporarily are presented in conductivity display window, the parameter value display window; In like manner, adjustable excitation frequency, capacitance, electricity are led constant, temperature compensation coefficient, electricity and are led zeroing, electricity and lead millivolt, 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, upper limit of concentration alarming value, concentration limit alarming value, electricity and lead to revise to lead at zero point, electricity and revise slope, route resistance, inner self calibration lock, electric capacity and calculate lock, conductivity and revise lock, filtrate conductivity ripple switch lock, crosstalk resistance switch lock, electrode protection resistance value, temperature lock, internal conductance rate and preserve and lock; Top monitoring parameter is arranged on the 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; Once more toggle switch is put normal bit (or closing 4 locks on the liquid crystal touch screen), recover normal function, arrive this, the complete machine adjustment finishes; Peripheral operation is done regular, suitable adjustment by the workman and is got final product.
Claims (9)
1. be with the accurate conductivity detection alarm of the self-compensating single channel of symmetrical lead appearance for one kind, comprise display device and internal circuit board, it is characterized in that said display device comprises liquid crystal touch screen, conductivity display window, parameter value display window, action button and pilot lamp; Said internal circuit board comprises motherboard and display board, and said motherboard is electrically connected through simple connector or stub cable with display board mutually; Said motherboard is outside to be connected with conductance electrode through symmetrical cable, and the inner symmetrical cable that passes through is connected with the measuring resistance array; Said symmetrical cable is a twin-concentric cable; Liquid crystal touch screen is connected with the main frame corresponding point through stub cable; Carry out data communication; Conductivity display window, parameter value display window, action button and pilot lamp are fixed on the display board; And carry out button scanning and coding, charactron and pilot lamp refresh at chip system through second on the display board, and second is electrically connected through simple connector or stub cable and motherboard corresponding point at chip system, and wherein SR is connected with the motherboard corresponding point through the reset signal cable;
The circuit of said motherboard is by the general supply interface; First at chip system; Mainboard is used the digital power circuit; Mainboard is used the analog power circuit; Use the power circuit circuit at chip system; The simulating signal limiter protection circuit; The CAN bus is with insulating power supply DC/DC and filter circuit; CAN bus isolated drive circuit; Solenoid valve is isolated 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; Display board communication interface circuit; Electricity is led with isolating the digital power circuit; Electricity is led with isolating the 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 changes direct current and buffer circuit; Temperature becomes send buffer circuit; The temperature detection interface is electrically connected composition jointly;
The circuit of said display board is electrically connected at chip system circuit, display power supply filtering circuit, charactron and action button and pilot lamp control circuit by display board and motherboard interface, second jointly to be formed.
2. conductivity detection alarm appearance according to claim 1 is characterized in that, in the said motherboard circuit, the power panel interface is made up of external 24V Switching Power Supply; First is electrically connected jointly by integrated circuit U5 and UK1, connector J1, resistance R 3, resistance R K1, resistance R 6, capacitor C 6～C24 and capacitor C K1 at chip system and constitutes; Be electrically connected jointly with R2, capacitor C 1～C5 and 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 at chip system and constitute; Extending out RAM and battery protecting circuit is electrically connected jointly by integrated chip U2 and U3 and constitutes; Crystal oscillation and reset circuit are electrically connected with R5, capacitor C 25～C28, button U6 by crystal oscillator U7, resistance R 4 jointly to be formed; The simulating signal limiter protection circuit is electrically connected jointly by amplifier U8 and U9, voltage stabilizing chip U10, limited amplitude protection chip U11, resistance R X1～RX7, capacitor C X1～CX5 and light emitting diode L1 and constitutes; Solenoid valve isolation output control circuit is electrically connected jointly by relay U12 and U13, triode N1 and N2, diode D7 and D8, resistance R 7, resistance R 8 and connector CAN1 and constitutes; CAN bus isolated drive circuit is electrically connected jointly by integrated circuit U14, high speed photo coupling U15 and U16, resistance R 9～R15, capacitor C 29～C35, connector CAN2 and constitutes; The built-in function circuit is electrically connected jointly by toggle switch NBJ1 and resistance R 20 and constitutes; Liquid crystal touch screen I/O communication interface circuit is electrically connected jointly by connector P2, resistance R 16～R17 and constitutes; Display board communication interface circuit is electrically connected jointly by connector P1, resistance R 16～R19, capacitor C 36 and constitutes; The switching signal buffer circuit is electrically connected jointly by high speed photo coupling U17～U20, resistance R 21～R25, capacitor C 38～C40 and constitutes; Active crystal oscillation and exiting signal generating circuit are electrically connected jointly with C43 by active crystal oscillator Y1, signal generator U21, resistance R 26～R30, magnetic bead RL1～RL3, capacitor C 42 and constitute; The precision voltage source circuit is electrically connected jointly by voltage stabilizer U22, diode D9, capacitor C 41, capacitor C 44～C46, short-circuiting device CB1 and constitutes; The signal filtering driving circuit is electrically connected jointly with L3 by amplifier U23 and U24, resistance R 31～R35, capacitor C 47～C58, inductance L 2 and constitutes; Electricity is led the trip stop transmission circuit and is electrically connected jointly with R51, resistance R A1, diode D10～D14, amplifier U30 and U33, capacitor C A1 and CA2, capacitor C 59～C62 by relay U25～U29, triode N3～N7, resistance R 36～R48, resistance R 50 and constitutes; Conductance measurement and self calibration commutation circuit are electrically connected jointly by relay U34, triode N8, resistance R 55, diode D15, connector ADIANDAOBO1 and ADIANDAOBI1 and constitute; Electricity is led the detection interface and is made up of connector ADIANDAO1; Electricity is led and exchange to be changeed direct current and buffer circuit and be electrically connected jointly by integrated circuit U31, amplifier U30, optocoupler U32, resistance R 49, resistance R 52～R54, capacitor C 63～C69 and constitute; Measuring resistance switching array circuit is electrically connected jointly by relay UMD1～UMD5, relay UUP1～UUP5, relay U35, triode N9～N11, resistance R A2～RA23, resistance R 56～R59, diode D16～D18, amplifier U23 and constitutes; Temperature becomes to be sent buffer circuit to be electrically connected jointly by amplifier U37, optocoupler U38, constant current tube U36, resistance R 60～R70, capacitor C 70～C73 to constitute; The temperature detection interface is made up of connector JPTAX1.
3. conductivity detection alarm appearance according to claim 2; It is characterized in that said CAN bus is electrically connected jointly by 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 and constitutes; Mainboard is electrically connected jointly by DC/DC power module U44, resistance R 102, capacitor C 76, wave filter U45 with the digital power circuit and constitutes; Mainboard is electrically connected jointly with LED2, resistance R 104～R113, capacitor C 78～C86 and inductance L 22 by 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 and constitutes; Electricity is led with isolating the digital power circuit and is electrically connected jointly by integration module U54, resistance R 124, capacitor C 96～C97, inductance L 26～L28 and constitutes; Electricity is led with isolating the simulation power circuit and is electrically connected jointly by DC/DC power module U51, voltage stabilizing chip U52 and U53, diode D21 and D22, LED 3 and LED4, resistance R 114～R123, capacitor C 87～C195, inductance L 23～L25 and constitutes.
4. conductivity detection alarm appearance according to claim 2 is characterized in that, in the circuit of said display board, display board and motherboard interface are electrically connected by connector P3, button RESET1, resistance R 71, resistance R 74, resistance R 75 and capacitor C D1 and constitute; Second is electrically connected by integrated chip U39, connector J2, resistance R 72 and resistance R 73 at the chip system circuit and constitutes; The display power supply filtering circuit is electrically connected and is constituted by voltage stabilizer U40, capacitor C D2～CD8; Shown in figure 15, said charactron and action button and pilot lamp control circuit are electrically connected and are constituted by integrated U41, integrated U42, resistance R 76～R100, charactron L17, charactron L18, pilot lamp L4～L16 and button S1～S12.
5. according to claim 3 or 4 described conductivity detection alarm appearance; It is characterized in that; Also comprise the power panel circuit in the circuit of said motherboard; Wherein, The power panel interface through power lead respectively with mainboard with digital power, mainboard with analog power, CAN bus with insulating power supply DC/DC and filter circuit, solenoid valve isolate output control circuit, electricity lead with isolate digital power, electricity is led with corresponding point on the circuit of isolating analog power and is connected, for motherboard provides simulation insulating power supply and digital insulating power supply separately respectively; First is connected with CAN bus isolated drive circuit, liquid crystal touch screen I/O communication interface circuit, display board communication interface circuit corresponding point respectively through data communication line at chip system; Said first is connected with the simulating signal limiter protection circuit through analog signal line at chip system; First isolates through switch signal line and built-in function circuit, solenoid valve at chip system that output control circuit, switching signal buffer circuit, conductance measurement are led the trip stop transmission circuit with self calibration commutation circuit, electricity, measuring resistance switching array circuit is connected, first chip system also through 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 chip system, simulating signal limited amplitude protection switch switching circuit corresponding point with analog power, first with mainboard with digital power with mainboard respectively with the digital power line through the analog power line with power circuit at chip system, the analog power and the digital power of high-quality is provided for the system core.
6. conductivity detection alarm appearance according to claim 5; It is characterized in that said active crystal oscillation is connected with switching signal buffer circuit, precision voltage source circuit and signal filtering driving circuit corresponding point through power lead, signal wire respectively with exiting signal generating circuit; Said conductance measurement is led between trip stop transmission circuit and the measuring resistance switching array circuit with self calibration commutation circuit, electricity and is connected through signal wire; Said electricity is led the trip stop transmission circuit and is led with electricity respectively through signal wire and detect interface, electricity and lead and exchanges the commentaries on classics direct current and buffer circuit is connected; Temperature becomes send buffer circuit to be connected with the temperature detection interface through signal wire; Electricity is led and exchange to be changeed direct current and buffer circuit, temperature and become and send buffer circuit to be connected with simulating signal limited amplitude protection switch switching circuit through signal wire respectively; Said electricity is led the detection interface and is connect the external electric conductive electrode through twin-concentric cable; The temperature detection interface is through the accurate platinum sensor of the external four-wire system of cable.
7. conductivity detection alarm appearance according to claim 6 is characterized in that analog power on the said mainboard 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; Said motherboard is led through electricity and is used the isolation digital power as switching signal buffer circuit and precision voltage source circuit power supply to be provided; Said motherboard is led to use through electricity and is isolated analog power and lead trip stop transmission circuit, measuring resistance switching array circuit, electricity as signal filtering driving circuit, conductance measurement and self calibration commutation circuit, electricity and lead and exchanges commentaries on classics direct current and buffer circuit and temperature change and send buffer circuit that the isolation analog power is provided; The isolation digital power that CAN bus isolated drive circuit uses is provided with insulating power supply DC/DC and filter circuit by the CAN bus.
8. conductivity detection alarm appearance according to claim 7; It is characterized in that; In the circuit of said display board; The display power supply filtering circuit is connected with motherboard with the motherboard interface through display board, obtains power supply and also refers to supply power with the pilot lamp control circuit in chip system circuit, charactron and action button to second; Second at the chip system circuit through display board and motherboard interface and motherboard communications exchange data; And be connected through inner synchronous serial line with the pilot lamp control circuit with action button with charactron, button is scanned and encodes, is used to refresh charactron and pilot lamp to output data.
9. conductivity detection alarm appearance according to claim 8; It is characterized in that said action button comprises that button, parameter are set to be increased button, the fast button of parameter, parameter and subtract button, SR, 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 ∏ button; Said 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 ∏ pilot lamp, tracking measurement pilot lamp, internal calibration pilot lamp, μ S pilot lamp, mS pilot lamp and alarm lamp.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120218819U CN202133719U (en) | 2011-06-24 | 2011-06-24 | Single-channel precision conductivity detection alarm instrument with symmetrical lead self-compensating function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120218819U CN202133719U (en) | 2011-06-24 | 2011-06-24 | Single-channel precision conductivity detection alarm instrument with symmetrical lead self-compensating function |
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| CN202133719U true CN202133719U (en) | 2012-02-01 |
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| CN201120218819U Expired - Fee Related CN202133719U (en) | 2011-06-24 | 2011-06-24 | Single-channel precision conductivity detection alarm instrument with symmetrical lead self-compensating function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279319A (en) * | 2011-06-24 | 2011-12-14 | 华南理工大学 | Self-compensating single-way precise conductivity detection alarm with symmetrical leads |
| CN104977322A (en) * | 2015-07-28 | 2015-10-14 | 华南理工大学 | Single-path seven-electrode conductivity detection monitor |
| CN105116939A (en) * | 2015-07-14 | 2015-12-02 | 华南理工大学 | Aluminum profile passivation process conductivity detection control device |
-
2011
- 2011-06-24 CN CN201120218819U patent/CN202133719U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279319A (en) * | 2011-06-24 | 2011-12-14 | 华南理工大学 | Self-compensating single-way precise conductivity detection alarm with symmetrical leads |
| CN102279319B (en) * | 2011-06-24 | 2013-11-13 | 华南理工大学 | Self-compensating single-way precise conductivity detection alarm with symmetrical leads |
| CN105116939A (en) * | 2015-07-14 | 2015-12-02 | 华南理工大学 | Aluminum profile passivation process conductivity detection control device |
| CN105116939B (en) * | 2015-07-14 | 2017-06-06 | 华南理工大学 | A kind of aluminium section bar passivating process electrical conductivity detection control apparatus |
| CN104977322A (en) * | 2015-07-28 | 2015-10-14 | 华南理工大学 | Single-path seven-electrode conductivity detection monitor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120201 Termination date: 20140624 |
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| EXPY | Termination of patent right or utility model |