CN105624734A - Aluminum electrolysis cell anode distributed current precise measuring instrument with self-calibration function - Google Patents
Aluminum electrolysis cell anode distributed current precise measuring instrument with self-calibration function Download PDFInfo
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- CN105624734A CN105624734A CN201610170140.2A CN201610170140A CN105624734A CN 105624734 A CN105624734 A CN 105624734A CN 201610170140 A CN201610170140 A CN 201610170140A CN 105624734 A CN105624734 A CN 105624734A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/20—Automatic control or regulation of cells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The invention provides an aluminum electrolysis cell anode distributed current precise measuring instrument with the self-calibration function and belongs to the technical field of aluminum electrolysis anode current distribution detection. The measuring instrument comprises a microprocessor, a self-calibration module, an A/D conversion module, a temperature acquisition module, an RS-485 communication module, a data storage module, a power module and an isolation protection module. Processed voltage and temperature signals are further analyzed and calculated by the microprocessor and converted into an anode current signal which is transmitted to an upper computer in an industrial-grade RS-485 bus manner. The measuring instrument has the self-calibration function and is provided with the DC/DC isolation power module. All digital signals are isolated from the microprocessor through a digital isolation chip. Anode distributed current can be precisely monitored in real time. Measuring precision is high, reliability is high, data management is convenient, current of anode guide rods of an aluminum electrolysis cell can be finally acquired, and the changing situation of distribution of anode current of the electrolysis cell can be finally acquired.
Description
Technical field
The present invention relates to aluminium electrolysis anode distribution of current detection technique field, refer to a kind of aluminium cell anode distributed current accurate measurement instrument with self-calibration function especially.
Background technology
Electrolysis of aluminum is a complicated electrochemical reaction process, will be subject to the coupling of multiple physical fields such as electric field, magnetic field, Re Chang, flow field. Badly the causing of the complicacy of Aluminium Electrolysis condition and production environment lacks the method to aluminium electrolysis process on-line monitoring and equipment, and the anodic current data that to be in Aluminium Electrolysis very important, the multiple situation in it and Aluminium Electrolysis has close ties. Current distribution in anode changes, and can cause the change of current efficiency, liquid aluminum can be caused unstable, can produce effect, can affect anode work-ing life, energy consumption can be caused to increase.
At present, aluminium electrolytic industry scene still adopts the method for artificial off-line to measure anodic current, i.e. the artificial hand-held drill rod being tied with volt ohm-milliammeter, detects anode rod pressure drop one by one, judges that whether the contact of anode rod and anode large bus bar is good according to test data. This kind of traditional detection method labor strength is big, can not be measured by all anode rods, inefficiency simultaneously, and data are seriously delayed, it is very difficult to the change of reaction Current distribution in anode in time. In industry spot test process, owing to production process is had important meaning by the test data of various parameter in production, therefore various data testing accuracy is required higher. And for traditional sensor, output be generally the faint simulating signal of millivolt level, temperature profile is poor, and signal to noise ratio obviously reduces in transmitting procedure. Whenever envrionment temperature and operating voltage change, or when the working order of device changes the generations such as (such as input passage bridge), gain or digital filter sunken wave frequency variation, signal input range change, the precision of DATA REASONING can produce bigger impact, it is thus desirable to the simulating signal of input calibrated, thus eliminate biased and gain error.
The domestic on-line measurement to aluminium electrolysis anode guide rod electric current has also carried out big quantifier elimination, CN201220251734.3 adopts the equidistant voltage signal of the mode direct antianode guide rod of coding and decoding to transmit, and data are shown over the display by the process of central processing element. But DATA REASONING precision is low, the data of transmission are four significant digits only, and not temperature compensated device; CN105242098A has invented a kind of constant current source aluminium electrolysis anode current measuring instrument based on differential amplification, because its differential amplification module can make the voltage signal collected more clear, but the temperature drift caused for on-the-spot environmental change does not carry out error correction, does not reach the measuring accuracy of requirement; CN204714919U has invented a kind of aluminum cell anodic current distribution on-Line Monitor Device, although the simulating signal collected is carried out amplification filtering process, but not for the correct functioning of zero wander, precision cannot ensure.
In sum, it is necessary to improve the monitoring level of aluminum cell anodic current distribution further, thus improve the level of control of electrolysis production further.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of aluminium cell anode distributed current accurate measurement instrument with self-calibration function, with solve existing metering system can not automatically correcting measuring signal and measuring accuracy difference etc. problem.
This survey meter comprises self calibration module, A/D changes module, microprocessor, temperature collect module, RS-485 communication module, data memory module, power supply module and isolation protection module, wherein, self calibration module is changed module with A/D and is electrically connected, A/D changes module and is electrically connected with microprocessor, A/D changes and arranges isolation protection module between module and microprocessor, temperature collect module is electrically connected with microprocessor, isolation protection module is set between temperature collect module and microprocessor, RS-485 communication module is electrically connected with microprocessor, isolation protection module is set between RS-485 communication module and microprocessor, data memory module is electrically connected with microprocessor, isolation protection module is set between data memory module and microprocessor, power supply module is self calibration module, A/D changes module, microprocessor, temperature collect module, RS-485 communication module and data memory module are powered.
Self calibration module mainly comprises self-calibration circuit, amplifies circuit and filtering circuit, can effectively calibrate input signal, and suppress common mode signal disturbing, reduces input noise, ensures measuring accuracy. Wherein self-calibration circuit selects the MAX4932 multichannel device switch I C of MaximIntegrated company, this multi-way switch is triple channel, by microprocessor directly by two digits signal control channel selecting, wherein 01,10,11 control passage one, passage two, passage three respectively. Power on and it is defaulted as 00, be i.e. high resistance state, to prevent equipment is caused damage by overcurrent. Concrete calibration process is: first carry out zero degree demarcation, namely selects a passage to make it be shorted to ground, to obtain determining the zero standard degree point of calibration factor, equation one, is wherein zero standard degree input value and output value respectively, and a is function coefficients, and b is constant; Then carry out full degree to demarcate, namely select the 2nd passage access standard signal source, obtain equation two, be wherein full scale input value and output value respectively, the 10mV standard source that standard signal source is provided by the ADR4525 chip of AnalogDevices company; According to linear proximity theory between above-mentioned two ranges, calculate coefficient a and the value of constant b, select the 3rd passage i.e. actual measure analog signals so that it is reasonably carry out auto modification zero error and gain error partially fast.
The equidistant pressure drop signal theoretical calculation value of anode rod is 0.761mV��2.173mV, in order to so little voltage signal is amplified to the appreciable level of A/D, it is necessary to use amplification circuit it to be processed. Select the INA129 precision instrument amplifier of TI company, this amplifier adopts differential type structure, three amplifiers are integrated in a chip, ensure that the structural complete symmetry of difference amplifier, there is the advantages such as low maladjustment voltage, ultralow Low-bias Current, ultralow temperature drift, high cmrr. Only need a gain resistor R and adjustable magnification scope from 1��10000 change, adopt high-precision metal membrane resistance as the gain setting resistor of amplifier.
In order to prevent aliasing effect and filter away high frequency noise effectively, the design arranges anti-aliased low-pass filter (LPF) between circuit and A/D converter amplifying. According to documents and materials and on-site experience introduction, the change frequency of anodic current is about 0.5Hz, in order to better filtering high frequency interference and more complete reproduction anodic current signal, the limiting frequency arranging wave filter is 10Hz. Design two grades, three rank Bart and irrigate this (Butterworth) active low-pass filter circuit, and increase bypass electric capacity when circuit layout at connection power supply place, isolate the exchange noise of power supply.
The simulating signal that filtering circuit exports is input to A/D through limiting circuit and changes module, owing to equidistant pressure drop signal lower (about 2mV), measuring accuracy require high, calculate by 0.5 class precision, the resolving power of the A/D conversion module then needed is at least 12, considering redundancy and the cost performance of system, the design adopts the A/D conversion chip of 16. Synthesise various factor, selects the AD7705 chip of AnalogDevices company. This chip is high speed, low-power consumption, successive approximation A/D converter, can meet the sampling rate requirement of 20Hz, uses ��-�� technology can realize 16 without error performance. A/D changes and adopts digital isolator to isolate between module and microprocessor.
For on-the-spot variation of ambient temperature, skew and gain drift are calibrated by the present invention by AD7705. The design is in self-calibration mode, and analog to digital converter determines inner setting point. The register that arranges of AD7705 is an eight bit register, and which kind of calibration of concrete selection can be programmed by MD1 and the MD0 position arranging register. When making MD1MD0=01, chip carries out self calibration. The zero standard degree point being used for determining calibration factor is with the input terminus of Differential Input pair in device inside short circuit, i.e. AIN1 (+)=AIN1 (-)=internal bias voltage V2; Full scale standard handovers completes under the standard signal source 2.5V voltage provided by ADR4525 chip. In this calibration pattern, determined by chip logic output pin to change and when terminate and the translation data of analog input can be used. It is high level during calibration initialize, until just turning into lower level when the conversion result of external analog input is available.
The high-performance technical grade microprocessor STM32F103 of ST company selected by microprocessor, and this chip core is 32 Cortex-M3 treaters of ARM company. Microprocessor mainly completes the collection of relevant data, process and the communication function with upper computer. Pass through software design, it is possible to realize upper computer when it is carried out initialize, school, a series of operation such as optimum configurations, parameter query, control command. Microprocessor can by the data packets of the much informations such as free for band, electric current, guide rod numbering to upper computer.
Temperature collect module mainly comprises temperature sensor and processes temperature signal module, and the design adopts PT100 temperature sensor as temperature survey element. Being arranged on fixture by PT100 temperature sensor and be close to anode rod surface, its signal gathered is the input of numerary signal as microprocessor through processes temperature signal module converts, and the calculating for antianode guide rod resistance value carries out temperature compensation. Temperature Treatment module selects MAX31865 chip, and the ADC of inner integrated 15, the resistance signal of RTD directly can be converted to the numerary signal that microprocessor can identify by it.
RS-485 communication module is transfer module, and in order to the data packet of the much informations such as free for band, electric current, guide rod numbering is real-time transmitted to upper computer, and the control command sent by upper computer and parameters are sent to microprocessor. Data corresponding adopts the technical grade RS-485 of daisy chain type bus mode to transmit. The signal exported from microprocessor is TTL level, it is necessary to be converted into the difference signal meeting 485 communication standards by electrical level transferring chip, the design selects the ADM2687E chip of AnalogDevices company, and data speed can reach 16Mbps.
In order to ensure the safety of data, the present invention devises data memory module, the various information datas exported in order to temporary microprocessor, the loss of data when avoiding communicating fault. Storage chip employing storage capacity is the SST25VF032B chip of 32Mb, and the clock requency of this chip reaches as high as 80MHz, and storage speed is fast; Convenient erasing, can select the erasing of sector erasing, 32kB or 64kB block, full wafer to wipe four kinds of erase mode; Storage capacity is big, is the image data of 0.05s for the sampling period, can Coutinuous store 9 hours.
Power supply is the key of the normal operation of whole system, therefore, and the performance of the direct influential system of the quality of power supply design and stability thereof. The voltage range needed due to system is more; and system to the performance requriements of power supply compared with high and want that cube is little, weight is light; therefore; adopt the form of high performance switch power supply; according to power demands and the environmental factors considering scene; add the DC/DC insulating power supply module (inner 1500V isolation) that Jin Shengyang Science and Technology Ltd. produces; security and the reliability of system can be improved, it is to increase the characteristic of EMC (Electromagneticcompatibility electromagnetic compatibility) also protects secondary side. The inventive design feed circuit of three kinds of grades, every grade all through insulating power supply module. The program is well positioned to meet the demand of low-tension circuit.
In order to be protected by microcontroller, devise isolation protection module in micro-process and A/D conversion between module, temperature collect module, data memory module, RS-485 communication module, the main digital isolating chip adopting Si8662 model. The operating temperature range of Si86622 digital isolator is wide, can bear the high temperature of on-the-spot about 80 DEG C of electrolysis of aluminum; Transfer speed 150Mbps is the level that current industry is the highest; Comparing with like product, jitter performance is minimum, can ensure to have minimum data transmission fault and the error rate; Immunity from interference is the strongest, and anti-electric jamming ability is 300V/m, and diamagnetic field interference performance is 1000A/m.
The useful effect of the technique scheme of the present invention is as follows:
(1) the design adopts equidistant pressure drop method to measure anodic current, and with self-calibration function, can eliminating biased and gain error, utilize the software filtering algorithm of microprocessor and ratio regression algorithm take off data to be processed simultaneously, measuring accuracy is up to 0.32%.
(2) the design adopts 485 bus transfer technology, supports infinite expanding, and signal communication is stablized. When survey meter can be carried out initialize, school by upper computer, a series of operation such as optimum configurations, parameter query, control command, it is achieved to the Real-Time Monitoring of all anodic currents, the data delay being sent to upper computer is no more than 48 seconds.
(3) the design adopts AD7705 data calibration function, when on-the-spot test environment changes, realizes data calibration by calibration automatically, with the internal error of abatement device, skew and gain and sensor drift error.
(4) it is equipped with numeral isolation module between the anode distribution all modules of electric current accurate measurement instrument of the design and microprocessor, effectively can protect microprocessor and maintain the stability of signal.
(5) the anode distribution electric current accurate measurement instrument structure of the design is simple, and reliable, measuring accuracy height, cost is low, is adapted at industry spot large-area applications.
Accompanying drawing explanation
Fig. 1 is the structural representation of the aluminium cell anode distributed current accurate measurement instrument with self-calibration function of the present invention;
Fig. 2 is the self calibration module circuit diagram of this survey meter;
Fig. 3 is the self calibration schema of this survey meter;
The A/D that Fig. 4 is this survey meter changes module circuit diagram;
Fig. 5 is the AD7705 reading data flow journey figure that this survey meter adopts;
Fig. 6 is the power supply function structure chart of this survey meter;
Fig. 7 is the isolation protection module schematic circuit of this survey meter;
Fig. 8 is the distributed architecture schematic diagram during application of this survey meter.
Wherein: 1-self calibration module; 2-A/D changes module; 3-microprocessor; 4-temperature collect module; 5-RS-485 communication module; 6-data memory module; 7-power supply module; 8-isolates protection module; 1-1-self-calibration circuit; 1-2-amplifies circuit; 1-3-filtering circuit; 9-anode distribution electric current accurate measurement instrument; 10-anode rod; 11-electrolyzer; 12-concentrator; 13-upper computer.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, it is described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The present invention is directed to existing metering system can not automatically correcting measuring signal and measuring accuracy difference etc. problem, it is provided that a kind of aluminium cell anode distributed current accurate measurement instrument with self-calibration function.
As shown in Figure 1, this survey meter comprises self calibration module 1, A/D changes module 2, microprocessor 3, temperature collect module 4, RS-485 communication module 5, data memory module 6, power supply module 7 and isolation protection module 8, wherein, self calibration module 1 is changed module 2 with A/D and is electrically connected, A/D changes module 2 and is electrically connected with microprocessor 3, A/D changes and arranges isolation protection module 8 between module 2 and microprocessor 3, temperature collect module 4 is electrically connected with microprocessor 3, isolation protection module 8 is set between temperature collect module 4 and microprocessor 3, RS-485 communication module 5 is electrically connected with microprocessor 3, isolation protection module 8 is set between RS-485 communication module 5 and microprocessor 3, data memory module 6 is electrically connected with microprocessor 3, isolation protection module 8 is set between data memory module 6 and microprocessor 3, power supply module 7 is self calibration module 1, A/D changes module 2, microprocessor 3, temperature collect module 4, RS-485 communication module 5 and data memory module 6 are powered.
As shown in Figure 2, the self calibration module 1 of this survey meter comprises self-calibration circuit 1-1, amplifies circuit 1-2 and filtering circuit 1-3, self-calibration circuit 1-1, amplification circuit 1-2 and filtering circuit 1-3 connect successively, filtering circuit 1-3 and A/D changes module 2 and is connected, amplifying circuit 1-2 adopts high-precision metal membrane resistance as gain setting resistor, and the limiting frequency of filtering circuit 1-3 is 10Hz; Self-calibration circuit 1-1 adopts the MAX4932 multichannel device switch I C of MaximIntegrated company, amplifies the INA129 precision meter that circuit 1-2 adopts TI company, and filtering circuit 1-3 adopts anti-aliased low-pass filter.
Self calibration module carries out self calibration according to flow process shown in Fig. 3.
As shown in Figure 4, A/D changes the AD7705 chip that module selects AnalogDevices company. This chip is high speed, low-power consumption, successive approximation A/D converter, can meet the sampling rate requirement of 20Hz, uses ��-�� technology can realize 16 without error performance.
For on-the-spot variation of ambient temperature, skew and gain drift are calibrated by this survey meter by AD7705. AD7705 reading data flow journey figure is as shown in Figure 5.
As shown in Figure 6; power supply module adopts the form of high performance switch power supply; according to power demands and the environmental factors considering scene; add the DC/DC insulating power supply module (inner 1500V isolation) that Jin Shengyang Science and Technology Ltd. produces; security and the reliability of system can be improved, it is to increase the characteristic of EMC (Electromagneticcompatibility electromagnetic compatibility) also protects secondary side. The inventive design feed circuit of three kinds of grades, every grade all through insulating power supply module. The program is well positioned to meet the demand of low-tension circuit. Power supply object in figure is self calibration module 1, A/D conversion module 2, microprocessor 3, temperature collect module 4, RS-485 communication module 5 and data memory module 6.
Isolation protection module mainly adopts the digital isolating chip of Si8662 model, and schematic circuit is as shown in Figure 7.
In addition, microprocessor 3 adopts the high-performance technical grade microprocessor STM32F103 of ST company. Temperature collect module 4 comprises temperature sensor and processes temperature signal module, and temperature sensor is PT100 temperature sensor.
This survey meter is in actual applications as shown in Figure 8, the anode distribution electric current accurate measurement instrument 9 of the present invention is directly installed in measured material, measured material is arranged on anode rod 10, and every root anode rod of electrolyzer 11 is all provided with an anode distribution electric current accurate measurement instrument 9. In order to reduce the space of measured material as far as possible, distance between two measuring heads is set as 10cm��15cm, the equidistant pressure drop signal theoretical calculation value of anode rod 10 is 0.761mV��2.173mV, in order to so little voltage signal is amplified to appreciable level, it is necessary to use and amplify circuit 1-2. After amplification, filtering, change module 2 through limiting circuit with A/D from equidistant drop measurement head extraction voltage signal to be connected, it is contemplated that adopt the AD7705 conversion chip of 16 to redundancy and cost performance the present invention. A/D changes and adopts isolation protection module 8 to isolate between module 2 and microprocessor 3, changes after the digital voltage signal after module 2 conversion flows through isolation protection module 8 being input to microprocessor 3 through A/D.
When adopting equidistant pressure drop method to measure guide rod electric current, what microprocessor 3 received is voltage signal, need anode rod 10 resistance value calculated between corresponding measuring head, anode rod 10 temperatures as high about 100 degree when electrolyzer 11 works, can antianode guide rod 10 resistance value have an impact, therefore it is provided with guide rod surface temperature acquisition module 4, does temperature compensation in order to antianode guide rod 10 resistance value. Temperature acquisition front end adopts PT100 temperature sensor, and the temperature signal gathered by temperature sensor is sent to the temperature collect module 4 of anode distribution electric current accurate measurement instrument 9, is input to microprocessor 3 after data processing.
The output terminal of microprocessor 3 is RS-485 communication module 5 and data memory module 6. Each electrolyzer 11 is provided with a concentrator 12, and the data that microprocessor 3 exports first are sent to the concentrator 12 of this electrolyzer 11 through RS-485 communication module 5, through concentrator 12 process, concentrate after be sent to upper computer 13. Various operation can be carried out, when comprising initialize, school, optimum configurations, parameter query, control command etc. by upper computer 13 antianode distributed current accurate measurement instrument 9. The data of the information such as when having sampled, microprocessor 3 is free by band every time, terminal address, anodic current send concentrator 12 to, and data are stored in data memory module 6.
Whole anode distribution electric current accurate measurement instrument 9 electricity consumption adopts power frequency 220V, and for different components is powered after switch power supply and voltage transitions circuit conversion, 220V voltage is directly drawn from manipulation electromechanical source, and power taking is convenient, it is not necessary to often change battery.
The above is the preferred embodiment of the present invention; it is noted that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also making some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. one kind has the aluminium cell anode distributed current accurate measurement instrument of self-calibration function, it is characterized in that: comprise self calibration module (1), A/D changes module (2), microprocessor (3), temperature collect module (4), RS-485 communication module (5), data memory module (6), power supply module (7) and isolation protection module (8), wherein, self calibration module (1) is changed module (2) with A/D and is electrically connected, A/D changes module (2) and is electrically connected with microprocessor (3), A/D changes and arranges isolation protection module (8) between module (2) and microprocessor (3), temperature collect module (4) is electrically connected with microprocessor (3), isolation protection module (8) is set between temperature collect module (4) and microprocessor (3), RS-485 communication module (5) is electrically connected with microprocessor (3), isolation protection module (8) is set between RS-485 communication module (5) and microprocessor (3), data memory module (6) is electrically connected with microprocessor (3), isolation protection module (8) is set between data memory module (6) and microprocessor (3), power supply module (7) is self calibration module (1), A/D changes module (2), microprocessor (3), temperature collect module (4), RS-485 communication module (5) and data memory module (6) power supply.
2. the aluminium cell anode distributed current accurate measurement instrument with self-calibration function according to claim 1, it is characterized in that: described self calibration module (1) comprises self-calibration circuit (1-1), amplify circuit (1-2) and filtering circuit (1-3), self-calibration circuit (1-1), amplification circuit (1-2) and filtering circuit (1-3) are connected successively, filtering circuit (1-3) is changed module (2) with A/D and is connected, amplifying circuit (1-2) adopts high-precision metal membrane resistance as gain setting resistor, the limiting frequency of filtering circuit (1-3) is 10Hz.
3. the aluminium cell anode distributed current accurate measurement instrument with self-calibration function according to claim 1 and 2, it is characterized in that: described self-calibration circuit (1-1) adopts the MAX4932 multichannel device switch I C of MaximIntegrated company, described amplification circuit (1-2) adopts the INA129 precision meter of TI company, and described filtering circuit (1-3) adopts anti-aliased low-pass filter.
4. the aluminium cell anode distributed current accurate measurement instrument with self-calibration function according to claim 1, it is characterised in that: the resolving power that described A/D changes module (2) is no less than 12.
5. the aluminium cell anode distributed current accurate measurement instrument with self-calibration function according to claim 1, it is characterised in that: described microprocessor (3) adopts the high-performance technical grade microprocessor STM32F103 of ST company.
6. the aluminium cell anode distributed current accurate measurement instrument with self-calibration function according to claim 1, it is characterized in that: described temperature collect module (4) comprises temperature sensor and processes temperature signal module, temperature sensor is PT100 temperature sensor.
7. the aluminium cell anode distributed current accurate measurement instrument with self-calibration function according to claim 1, it is characterised in that: described power supply module (7) is DC/DC insulating power supply module.
8. the aluminium cell anode distributed current accurate measurement instrument with self-calibration function according to claim 1, it is characterised in that: described isolation protection module (8) adopts the digital isolating chip of Si8662 model.
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| CN112731254A (en) * | 2021-03-31 | 2021-04-30 | 北京齐碳科技有限公司 | Method, device, system and equipment for determining calibration parameters of current measurement circuit |
| CN113049875A (en) * | 2021-04-02 | 2021-06-29 | 贵州创新轻金属工艺装备工程技术研究中心有限公司 | Device suitable for multi-path weak voltage signal acquisition of aluminum electrolytic cell anode current distribution |
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| CN112731254B (en) * | 2021-03-31 | 2021-07-13 | 北京齐碳科技有限公司 | Method, device, system and equipment for determining calibration parameters of current measurement circuit |
| CN113049875A (en) * | 2021-04-02 | 2021-06-29 | 贵州创新轻金属工艺装备工程技术研究中心有限公司 | Device suitable for multi-path weak voltage signal acquisition of aluminum electrolytic cell anode current distribution |
| CN113917225A (en) * | 2021-09-28 | 2022-01-11 | 紫光展讯通信(惠州)有限公司 | Monitoring device of instrument |
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Application publication date: 20160601 |