Data recorder

Abstract

The invention discloses a data recorder, which integrates a memory, a main controller, a multi-channel analog-to-digital converter, a millivolt end, a common reference end, a voltage end and a voltage and current end into a whole, so that multiple monitoring modes are integrated into a whole. Tasks of multiple monitoring modes such as decoupler monitoring and potentiostat monitoring can be completed only through one device, the device purchase, maintenance and operation cost is reduced, and economic benefits are greatly improved. By virtue of the unique design of four wiring terminals (a millivolt terminal, a common reference terminal, a voltage terminal and a voltage and current terminal) and an optimized wiring mode, the equipment wiring process is greatly simplified; all monitoring data are ensured to be acquired and recorded in the same time frame in a unified data acquisition mode, a solid foundation is laid for subsequent accurate evaluation of the corrosion state of the pipeline, engineers are helped to accurately judge the operation condition of the pipeline cathode protection system, potential corrosion risks are found in time, and the safety management level of the pipeline is improved.

Description

Technical Field

[0001] The present application relates to the technical field of data processing, and in particular to a data recorder. Background Art

[0002] In the field of buried steel pipeline corrosion protection, corrosion problems mainly originate from microscopic galvanic cells and stray current interference corrosion. Microscopic galvanic cells form tiny electrochemical corrosion cells on the metal surface of the pipeline due to uneven materials of the pipeline itself or environmental factors, generating anode and cathode areas, causing local corrosion; stray current interference corrosion is the current generated by the external electrical system transmitted to the pipeline, causing electrochemical corrosion and accelerating pipeline damage.

[0003] In response to these corrosion problems, cathodic protection technology is often used to prevent corrosion caused by microscopic galvanic cells or DC stray current interference. External current or sacrificial anode is applied to maintain the negative potential of the pipeline. AC stray current interference is discharged by decoupling and isolating devices. To evaluate the corrosion protection effect, it is necessary to monitor the polarization potential of the pipeline, AC and DC current density, and the status of related facilities. Although existing instruments have measurement functions, they have many shortcomings.

[0004] Some existing recorders have single functions and cannot meet complex testing requirements; multiple devices are required to monitor the decoupler, the wiring is complicated, and it is difficult for workers to operate; it is impossible to monitor the voltage at the feedback end of the constant potentiostat; the input voltage range is large, and the current measurement accuracy through the shunt is low. These defects seriously restrict the efficient implementation of pipeline corrosion protection monitoring work.

[0005] It is understandable that the disadvantages of the prior art are:

[0006] (1) Using multiple devices leads to high costs:

[0007] In the prior art, in order to monitor the decoupler, two or more independent electrochemical test instruments are usually required, which significantly increases the purchase, maintenance and operation costs of the equipment and increases the overall cost of the project.

[0008] (2) Complex wiring and difficult on-site implementation:

[0009] The use of multiple devices requires complex wiring configuration. Workers need to connect multiple instruments to pipes and electrodes for each measurement. This complex wiring method makes on-site operations more difficult, especially in harsh construction environments. It is easy to cause wiring errors and affect the reliability of test results.

[0010] (3) Data time is difficult to synchronize and difficult to merge for analysis:

[0011] When different devices are collecting data, long-term operation will cause the time synchronization performance of data recording to deteriorate due to different clock sources, and the data cannot be effectively compared and analyzed, resulting in: when making a comprehensive assessment of the corrosion status, data is collected for a long time, but the data cannot be synchronized, which may lead to misjudgment or omission of important information generated by synchronization, affecting the judgment of the working status of the decoupler.

[0012] Therefore, a new device for recording cathodic protection data is urgently needed. Summary of the invention

[0013] The present application provides a data recorder, which can improve the cost-effectiveness of data recording, make the operation of data recording convenient and efficient, and the data accurate and reliable, effectively solve the problems of difficult time synchronization and combined analysis of data from different devices in the prior art, lay a solid foundation for the subsequent accurate assessment of pipeline corrosion status, help engineers accurately judge the operating status of the pipeline cathodic protection system, timely discover potential corrosion risks, and improve the level of pipeline safety management.

[0014] In a first aspect, the present application provides a data recorder, the data recorder comprising a memory, a main controller, a multi-channel analog-to-digital converter, a millivolt terminal, a common reference terminal, a voltage terminal, and a voltage-current terminal; wherein the memory is connected to the main controller, the main controller is connected to the multi-channel analog-to-digital converter, and the multi-channel analog-to-digital converter is respectively connected to the millivolt terminal, the common reference terminal, the voltage terminal, and the voltage-current terminal;

[0015] The main controller is used to configure the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal according to the target monitoring mode, and to collect data information of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal through the multi-channel analog-to-digital converter, store the data information in the memory, and generate a monitoring result corresponding to the target monitoring mode based on the data information;

[0016] The memory is used to store the data information and the monitoring results corresponding to the target monitoring mode;

[0017] The multi-channel analog-to-digital converter is used to collect data information of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal in the target monitoring mode; wherein the multi-channel analog-to-digital converter includes a plurality of analog front ends;

[0018] The millivolt terminal is used to collect voltage at the millivolt level;

[0019] The common reference terminal is used to connect to the ground point GND of each analog front end to form a reference loop of the multiple analog front ends;

[0020] The voltage terminal is used to collect the voltage of the volt level voltage;

[0021] The voltage and current terminal is used to measure current or voltage.

[0022] Optionally, the multiple analog front ends include a first voltage analog front end, a second voltage analog front end, a third voltage analog front end and a current analog front end; the first voltage analog front end is connected to the millivolt end, the second voltage analog front end is connected to the voltage end, the third voltage analog front end and the current analog front end are both connected to the voltage and current ends through an analog switch, and the analog switch is used to switch the connection between the voltage and current ends and the third voltage analog front end and the current analog front end.

[0023] Optionally, the target monitoring mode is a test piece monitoring mode; the configuration of the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes:

[0024] Configure the millivolt terminal to be suspended;

[0025] Configuring the common reference terminal to connect to the test piece;

[0026] Configuring the voltage terminal to be connected to a reference electrode;

[0027] The voltage and current end is configured to be connected to the metal pipeline for transporting oil and gas to be tested; wherein, if the analog switch is connected to the current simulation front end, the voltage and current end measures the current between the test piece and the metal pipeline, and if the analog switch is connected to the third voltage simulation front end, the voltage and current end measures the voltage between the test piece and the metal pipeline, and uses the voltage as the voltage difference between the test piece and the reference electrode.

[0028] Optionally, the target monitoring mode is a dual-potential monitoring mode; the configuration of the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes:

[0029] Configure the millivolt terminal to be suspended;

[0030] Configuring the common reference terminal to be connected to a reference electrode;

[0031] Configuring the voltage terminal to connect to a first potential monitoring point of the object to be detected;

[0032] The voltage and current end is configured to be connected to a second potential monitoring point of the object to be detected; wherein the analog switch connects to the third voltage analog front end, and the voltage and current end measures the voltage between the first potential monitoring point and the second potential monitoring point.

[0033] Optionally, the target monitoring mode is a decoupler monitoring mode; the configuration of the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes:

[0034] The millivolt end is configured to be connected to one end of the decoupler connected to the pipeline; wherein one end of the decoupler is connected to the pipeline through a shunt, and the other end of the decoupler is connected to the ground bed; the shunt is used to convert the current into a millivolt voltage drop at both ends of the shunt, and then measure it through the millivolt end;

[0035] configuring the common reference end to be connected to the pipeline;

[0036] Configuring the voltage terminal to be connected to a reference electrode;

[0037] The voltage and current terminal is configured to be connected to the ground bed; wherein, when the analog switch is connected to the third voltage analog front end, the voltage and current terminal measures the voltage between the reference electrode and the ground bed.

[0038] Optionally, the target monitoring mode is a constant potential instrument monitoring mode; the configuration of the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes:

[0039] The millivolt end is configured to be connected to the cathode of the constant potential instrument and to be connected to the pipeline through a shunt; the shunt is used to convert the current into a millivolt voltage drop at both ends of the shunt, and then measure it through the millivolt end;

[0040] configuring the common reference end to be connected to the pipeline;

[0041] Configuring the voltage terminal to be connected to a reference electrode;

[0042] The voltage and current end is configured to be connected to the power-on point of the constant potential instrument, and the power-on point of the constant potential instrument is connected to the pipeline; wherein the analog switch connects to the third voltage analog front end, and the voltage and current end measures the voltage between the reference electrode and the power-on point relative to the pipeline.

[0043] Optionally, the target monitoring mode is a synchronous on-off mode; the configuration of the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes:

[0044] Configure the millivolt terminal to be suspended;

[0045] The common reference end is configured to be connected to a metal pipeline for transporting oil and gas to be tested;

[0046] Configuring the voltage terminal to be connected to a reference electrode;

[0047] Configure the voltage and current terminals to be left floating

[0048] The voltage of the reference electrode and the metal pipe is collected through Beidou satellite synchronous timing to monitor the potential.

[0049] Optionally, the target monitoring mode is a data line pattern recognition mode, and the data recorder further includes a data port; the configuration of the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal, and the voltage and current terminal includes:

[0050] The millivolt terminal, the common reference terminal connected to the test piece, the voltage terminal, the voltage and current terminal, and the data port are all connected to the in-line EEPROM of the single bus built into the data line to be tested;

[0051] The data port reads the contents of the in-line EEPROM in a single bus format, identifies the serial number and mode corresponding to the data line based on the contents, and implements mode and harness matching based on the serial number and mode corresponding to the data line.

[0052] Optionally, the target monitoring mode is an automatic calibration mode, and the data recorder further includes a data port; the configuration of the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal, and the voltage and current terminal includes:

[0053] The millivolt terminal, the common reference terminal connected to the test piece, the voltage terminal, the voltage and current terminal, and the data port are all connected to the calibration source through a connecting harness;

[0054] configuring the connection harness to perform single bus communication through the data port and identify a calibration source connection;

[0055] For each port in the data recorder, the calibration controller in the calibration source controls the connection status of the output voltage and current reference according to time; the calibration source controls the data recorder to enter a preset calibration mode, the calibration source outputs a reference voltage value or a reference current value, and notifies the data recorder to record the reference voltage value or the reference current value through the connecting harness and the data port, and automatically calibrates the port according to the voltage value or current value of the port and the reference voltage value or the reference current value.

[0056] Optionally, the multi-channel analog-to-digital converter is an 8-channel analog-to-digital converter.

[0057] Compared with the prior art, the present application provides a data recorder, which has the following beneficial effects:

[0058] Significant cost-effectiveness: This application integrates the memory, main controller, multi-channel analog-to-digital converter, millivolt terminal, common reference terminal, voltage terminal, and voltage-current terminal into one, realizing the integration of multiple monitoring modes into one. Only one device is needed to complete the tasks of multiple monitoring modes such as decoupler monitoring and constant potentiostat monitoring, which changes the previous situation of requiring multiple independent electrochemical testing instruments, greatly reduces equipment procurement, maintenance and operation costs, greatly improves economic benefits, and provides an effective means for enterprises to reduce pipeline corrosion protection monitoring costs;

[0059] Convenient and efficient operation: With the unique four-terminal design (i.e., millivolt terminal, common reference terminal, voltage terminal, voltage and current terminal) and optimized wiring method, the voltage and current terminals are equipped with analog switches to switch the working mode, which greatly simplifies the equipment wiring process. The difficulty of operation for on-site workers is significantly reduced, effectively avoiding errors caused by complex wiring, improving installation and testing efficiency, ensuring the smooth progress of monitoring work, and reducing downtime and resource waste caused by operational errors;

[0060] Accurate and reliable data: A unified data collection method is adopted to ensure that all monitoring data are acquired and recorded within the same time frame, which effectively solves the problems of time synchronization and combined analysis of data from different devices in the existing technology, laying a solid foundation for the subsequent accurate assessment of pipeline corrosion status, helping engineers to accurately judge the operating status of the pipeline cathodic protection system, timely discover potential corrosion risks, and improve the level of pipeline safety management.

[0061] The further effects of the above-mentioned non-conventional preferred manner will be described below in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the embodiments of the present application or the existing technical solutions, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0063] Figure 1 A schematic diagram of the structure of a data recorder provided in one embodiment of the present application;

[0064] Figure 2 A connection diagram of a data recorder in a test piece monitoring mode provided by an embodiment of the present application;

[0065] Figure 3 A connection diagram of a data recorder in a dual potential monitoring mode provided by an embodiment of the present application;

[0066] Figure 4A connection diagram of a data recorder in a decoupler monitoring mode provided by an embodiment of the present application;

[0067] Figure 5 A connection diagram of a data recorder in a constant potential instrument monitoring mode provided by an embodiment of the present application;

[0068] Figure 6 A connection diagram of a data recorder in a synchronous on-off mode provided by an embodiment of the present application;

[0069] Figure 7 A connection diagram of a data recorder in a data line pattern recognition mode provided by an embodiment of the present application;

[0070] Figure 8 A connection diagram of a data recorder in automatic calibration mode provided by an embodiment of the present application. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0072] Various non-limiting implementations of the present application are described in detail below in conjunction with the accompanying drawings.

[0073] In the prior art, monitoring the decoupler in the pipeline cathodic protection system usually requires the use of multiple independent electrochemical test instruments, such as one for dual potential monitoring and another for current monitoring. This multi-device solution not only increases the equipment investment cost, but also makes wiring and operation complicated, making it difficult for on-site workers to implement. When using two devices, merging the data of the two devices is also a problem. Among them, if there is a time difference between the two devices, the credibility of the data will be greatly reduced.

[0074] The decoupler in the pipeline cathodic protection system is a key component to ensure the normal operation of the system, and its performance needs to be monitored in real time. However, the existing multi-device monitoring solution not only increases the difficulty of operation, but also may affect the continuity and accuracy of monitoring due to coordination problems between devices.

[0075] To solve the above problems, this application proposes a miniaturized multifunctional data recorder that integrates test piece monitoring, dual potential monitoring, decoupler monitoring, constant potential instrument monitoring, synchronous on-off measurement and other functions. Through the innovation of wiring method, it can complete the comprehensive monitoring of pipeline cathodic protection system through a single device and four wiring terminals. This not only simplifies the wiring method and operation process, but also ensures the continuity of monitoring data and improves the convenience and reliability of detection.

[0076] See also Figure 1 , shows a data recorder in an embodiment of the present application, the data recorder includes a memory, a main controller, a multi-channel analog-to-digital converter (for example, the multi-channel analog-to-digital converter can be an 8-channel analog-to-digital converter, i.e., 8CHADC), a millivolt terminal, a common reference terminal, a voltage terminal, and a voltage-current terminal; wherein the memory is connected to the main controller, the main controller is connected to the multi-channel analog-to-digital converter, and the multi-channel analog-to-digital converter is respectively connected to the millivolt terminal, the common reference terminal, the voltage terminal, and the voltage-current terminal.

[0077] The main controller is used to configure the monitoring connection mode of the millivolt end, the common reference end, the voltage end and the voltage-current end according to the target monitoring mode, and to collect data information of the millivolt end, the common reference end, the voltage end and the voltage-current end through the multi-channel analog-to-digital converter, store the data information in the memory, and generate the monitoring result corresponding to the target monitoring mode based on the data information. It should be noted that the data information of the millivolt end, the common reference end, the voltage end and the voltage-current end collected by the multi-channel analog-to-digital converter is cathodic protection data, that is, the data recorder of the present application is a data recorder for recording cathodic protection data; cathodic protection data generally refers to cathodic protection data. Cathodic protection is an electrochemical protection technology that prevents metals from corroding in an electrolyte environment. It is widely used in the anti-corrosion of metal pipelines, storage tanks, docks and other facilities in the fields of petroleum, natural gas, chemical industry, marine engineering, municipal engineering, etc., and cathodic protection data is all kinds of monitoring and recording data involved in the cathodic protection process.

[0078] The memory is used to store the data information and the monitoring results corresponding to the target monitoring mode. The multi-channel analog-to-digital converter is used to collect data information of the millivolt end, the common reference end, the voltage end and the voltage-current end under the target monitoring mode. Wherein, the multi-channel analog-to-digital converter includes multiple analog front ends. The millivolt end is used to collect voltage quantities at the millivolt level. The common reference end is used to connect to the ground point GND of each analog front end to form a reference loop of the multiple analog front ends. The voltage end is used to collect voltage quantities at the volt level. The voltage-current end is used to measure current or voltage.

[0079] In one implementation, Figure 1 As shown, the multiple analog front ends include a first voltage analog front end (i.e., voltage analog front end 1), a second voltage analog front end (i.e., voltage analog front end 2), a third voltage analog front end (i.e., voltage analog front end 3) and a current analog front end; the first voltage analog front end is connected to the millivolt end, the second voltage analog front end is connected to the voltage end, the third voltage analog front end and the current analog front end are both connected to the voltage and current end through an analog switch, and the analog switch is used to switch the connection between the voltage and current end and the third voltage analog front end and the current analog front end.

[0080] It is understandable that the data recorder of the present application has four terminals, wherein the terminals are defined as follows: ① millivolt terminal (mV), ② common reference terminal (Ref), ③ voltage terminal 1 (V1), and ④ voltage and current terminal 2 (VA2).

[0081] Figure 1 The overall structure of the recorder and the connection relationship between each functional module mainly include the following parts: Memory: used to store recorded data. Main controller: responsible for the control of the entire system, including ADC readout and data storage, workflow control, etc. It should be noted that the recorder has a clock source inside. According to the clock source and the configuration before acquisition, the recorder can get a workflow. For example, one cycle is every 10s, in which the current value is collected in the first second, and two voltage values ​​are collected in the second second, and the rest of the time is not working. Under this workflow, the recorder will collect data in a preset configuration and store it in the memory. 8CHADC: 8-channel analog-to-digital converter, which can read 8 analog quantities at the same time.

[0082] Voltage analog front end 1: millivolt voltage input, dedicated to monitoring millivolt voltage. The millivolt terminal is equivalent to the millivolt terminal on a multimeter. This terminal can collect millivolt voltage, for example, it can be used to measure the voltage drop of a shunt.

[0083] Voltage analog front end 2, 3: Voltage input, used to monitor volt-level voltage. The voltage terminal is equivalent to the V terminal on the multimeter, which can measure the V-level voltage. Among them, the voltage value such as the pipe-to-ground potential can reach tens of volts, so it is necessary to use the V-level voltage terminal to connect the target to be measured to collect the voltage.

[0084] The common reference terminal is equivalent to GND, which is the 0-level reference of each analog front end. Each voltage or current value uses this terminal as the zero reference, so this terminal is the reference loop of each analog front end and is connected to the GND of each analog front end.

[0085] Current analog front end: mA current input, dedicated to monitoring mA-level current.

[0086] Analog switch: used to switch the working mode of terminal ④, that is, to switch the analog switch to input current or input voltage, specifically, to measure current or voltage. Figure 1 As shown, when the upper part of the switch is turned on, that is, when the voltage analog front end is connected, the terminal can measure the voltage value. When the lower part of the switch is turned on, that is, when the current analog front end is connected, the terminal can measure the current value and no longer measure the voltage value.

[0087] Among them, by controlling the timing through the main controller, the ADC can simultaneously collect the effective values ​​of the DC voltage and AC voltage output by each analog front end, a total of eight data, and save them in the memory. Specifically, the main controller can read the measurement data from the 8CHADC through a certain protocol. Among them, according to the engineer's configuration, if the cycle is 10s, the voltage is read in the first second, the current is read in the second second, and the rest does not work. Then the main controller will save the voltage value after reading it in the first second. After reading it in the second second, save the current value.

[0088] In one implementation, Figure 2 As shown, the target monitoring mode is a test piece monitoring mode; the monitoring connection mode of configuring the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes:

[0089] Configure the millivolt terminal to be suspended;

[0090] Configuring the common reference terminal to connect to the test piece;

[0091] Configuring the voltage terminal to be connected to a reference electrode;

[0092] The voltage and current end is configured to be connected to the metal pipeline for transporting oil and gas to be tested; wherein, if the analog switch is connected to the current simulation front end, the voltage and current end measures the current between the test piece and the metal pipeline, and if the analog switch is connected to the third voltage simulation front end, the voltage and current end measures the voltage between the test piece and the metal pipeline, and uses the voltage as the voltage difference between the test piece and the reference electrode.

[0093] For this connection method, the millivolt end is suspended, the common reference end is connected to the test piece, the voltage end 1 is connected to the reference electrode, and the voltage and current end 2 is connected to the pipeline (i.e., the pipeline end to be tested in the project, specifically, the metal pipeline for transporting oil and gas). It can be understood that the common reference end is equivalent to the reference loop of ends 1-3, which is internally connected to the ground of each analog front end. At this time, if the analog switch is connected to the current end, the current between the test piece and the pipeline is measured. If the analog switch is connected to the voltage end 3 (i.e., the third voltage analog front end), the voltage from the test piece to the pipeline can be measured, and then the voltage of the test piece to the reference can be obtained. The voltage of the test piece to the reference is the voltage difference between the two, which can also be understood as the reading of the voltmeter with the positive pole connected to the test piece and the negative pole connected to the reference.

[0094] In one implementation, Figure 3 As shown, the target monitoring mode is a dual-potential monitoring mode; the monitoring connection mode of configuring the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes:

[0095] Configure the millivolt terminal to be suspended;

[0096] Configuring the common reference terminal to be connected to a reference electrode;

[0097] Configuring the voltage terminal to connect to a first potential monitoring point of the object to be detected;

[0098] The voltage and current end is configured to be connected to a second potential monitoring point of the object to be detected; wherein the analog switch connects to the third voltage analog front end, and the voltage and current end measures the voltage between the first potential monitoring point and the second potential monitoring point.

[0099] For this connection method, the millivolt end is left floating, the common reference end is connected to the reference electrode, and the analog switch is switched to the voltage end, so that two potential monitoring inputs can be recorded simultaneously. The two channels are potential monitoring point 1 and potential monitoring point 2. The dual potential monitoring points record two potential values ​​at the same time, so as to compare the voltages at both ends. If the voltages at both ends that should be insulated are measured at the same time, there should be obvious differences in the voltage changes at both ends. If they have the same trend, it can be considered that the insulation has failed or the effect is not good.

[0100] In one implementation, Figure 4 As shown, the target monitoring mode is a decoupler monitoring mode; the monitoring connection mode of configuring the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes:

[0101] The millivolt end is configured to be connected to one end of the decoupler connected to the pipeline (i.e., the end of the pipeline to be measured in the project, specifically, a metal pipeline for transporting oil and gas); wherein one end of the decoupler is connected to the pipeline through a shunt, and the other end of the decoupler is connected to the ground bed; the shunt is used to convert the current into a millivolt voltage drop at both ends of the shunt, and then measure it through the millivolt end;

[0102] configuring the common reference end to be connected to the pipeline;

[0103] Configuring the voltage terminal to be connected to a reference electrode;

[0104] The voltage and current terminal is configured to be connected to the ground bed; wherein, when the analog switch is connected to the third voltage analog front end, the voltage and current terminal measures the voltage between the reference electrode and the ground bed.

[0105] For this connection method, the millivolt end is connected to the terminal of the decoupler facing the pipeline, the common reference end is connected to the pipeline, and a shunt device is connected in series in the middle. The decoupler is set between the pipeline and the drainage bed. The shunt can convert a large current (generally an ampere-level current, such as 1A 3A 30A) into a millivolt-level voltage drop at both ends of the shunt, and measure it through the millivolt end of the instrument, that is, it can be converted into a millivolt-level voltage drop through the shunt. At the same time, the voltage terminal 1 is connected to the reference electrode, and the voltage and current terminal 2 is connected to the bed. At this time, the analog switch is switched to the voltage terminal (that is, the third voltage analog front end), which is equivalent to measuring the potential of the reference electrode and the bed at the same time. This connection method reduces the number of pins used for decoupler monitoring, is simple to connect, and can synchronously collect data from each channel.

[0106] In one implementation, Figure 5 As shown, the target monitoring mode is a constant potential instrument monitoring mode; the monitoring connection mode of configuring the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes:

[0107] The millivolt end is configured to be connected to the cathode of the constant potential instrument and to be connected to the pipeline (i.e., the pipeline end to be measured in the project, specifically, the metal pipeline for transporting oil and gas) through a shunt; the shunt is used to convert the current into a millivolt voltage drop at both ends of the shunt, and then measure it through the millivolt end;

[0108] configuring the common reference end to be connected to the pipeline;

[0109] Configuring the voltage terminal to be connected to a reference electrode;

[0110] The voltage and current end is configured to be connected to the power-on point (i.e., zero position) of the constant potential instrument, and the power-on point of the constant potential instrument is connected to the pipeline; wherein the analog switch connects to the third voltage analog front end, and the voltage and current end measures the voltage between the reference electrode and the power-on point relative to the pipeline.

[0111] For this connection method, the millivolt end is connected to the output terminal of the potentiostat (i.e., cathode), the common reference end is connected to the pipeline, and a shunt device is connected in series in the middle. The shunt can convert the large current into a millivolt voltage drop at both ends of the shunt, and measure it through the millivolt end of the instrument. At the same time, the voltage end 1 is connected to the reference electrode, and the voltage and current end 2 measures the potential of the power-on point. At this time, the analog switch is switched to the voltage end, which is equivalent to measuring the potential of the reference electrode and the power-on point to the pipeline at the same time. This connection method can directly monitor the working status of the constant potential instrument.

[0112] In one implementation, Figure 6 As shown, the target monitoring mode is a synchronous on-off mode; the configuration of the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes:

[0113] Configure the millivolt terminal to be suspended;

[0114] The common reference end is configured to be connected to a metal pipeline for transporting oil and gas to be tested;

[0115] Configuring the voltage terminal to be connected to a reference electrode;

[0116] Configure the voltage and current terminals to be left floating

[0117] The voltage of the reference electrode and the metal pipe is collected through Beidou satellite synchronous timing to monitor the potential.

[0118] For this connection method, the voltage of the reference and pipeline can be collected through Beidou satellite synchronization timing to monitor the potential of the pipeline. Using the above connection method, the data recorder can collect multiple data simultaneously. Different connection methods can expand the function of the recorder to meet various needs in the field of cathodic protection.

[0119] In one implementation, Figure 7 As shown, the target monitoring mode is a data line pattern recognition mode, and the data recorder also includes a data port; the monitoring connection mode of configuring the millivolt terminal, the common reference terminal, the voltage terminal, and the voltage and current terminal includes:

[0120] The millivolt terminal, the common reference terminal connected to the test piece, the voltage terminal, the voltage and current terminal, and the data port are all connected to the in-line EEPROM of the single bus built into the data line to be tested;

[0121] The data port reads the contents of the in-line EEPROM in a single bus format, identifies the serial number and mode corresponding to the data line based on the contents, and implements mode and harness matching based on the serial number and mode corresponding to the data line.

[0122] It should be noted that the data recorder has a variety of connection lines for different measurement modes. The model and corresponding mode of the connection line can be automatically identified. This function is realized by a newly added data terminal (i.e., data port). The test line has a built-in single-bus EEPROM. The data recorder can detect the connection of the cable and turn it on. After turning on, the content of the EEPROM in the line can be read through the D0 terminal (i.e., data port) in a single-bus form, so as to identify the serial number and mode corresponding to this line, and then achieve mode and harness matching. If the test line corresponding to mode 1 is inserted, there are three final lead-out terminals, marked with test piece, reference, and pipeline respectively. Therefore, it not only reduces the connection burden of field engineers during application, but also effectively prevents equipment damage caused by wrong connection.

[0123] In one implementation, Figure 8 As shown, the target monitoring mode is an automatic calibration mode, and the data recorder also includes a data port; the monitoring connection mode of configuring the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes:

[0124] The millivolt terminal, the common reference terminal connected to the test piece, the voltage terminal, the voltage and current terminal, and the data port are all connected to the calibration source through a connecting harness;

[0125] configuring the connection harness to perform single bus communication through the data port and identify a calibration source connection;

[0126] For each port in the data recorder, the calibration controller in the calibration source controls the connection status of the output voltage and current reference according to time; the calibration source controls the data recorder to enter a preset calibration mode, the calibration source outputs a reference voltage value or a reference current value, and notifies the data recorder to record the reference voltage value or the reference current value through the connecting harness and the data port, and automatically calibrates the port according to the voltage value or current value of the port and the reference voltage value or the reference current value.

[0127] It should be noted that the recorder can be automatically calibrated through the calibration source connection line. Among them, the connection harness communicates via the D0 port on a single bus to identify the calibration source connection. At this time, the calibration controller controls whether the output reference is connected or not according to time. Among them, the calibration source can control the recorder to enter a specific calibration mode. At this time, the calibration source outputs a reference voltage or current value, and tells the recorder to record the reference value through the bus. By traversing each port according to this reference source output, the automatic calibration of the new recorder can be achieved. Because the accuracy of the instrument will drift over time, this automatic calibration function is very meaningful for new recorder equipment used in long-term projects. For example, calibration does not have to be returned to the factory every time, and it no longer requires professional operation, which can greatly improve the efficiency of equipment use.

[0128] In summary, the present application proposes a miniaturized and multifunctional data recorder having four terminals: ① millivolt terminal (mV), ② common reference terminal (Ref), ③ voltage terminal 1 (V1), and ④ voltage and current terminal 2 (VA2). Among them, terminal ④ is the multiplexing of voltage terminal 2 and current terminal. At the same time, by switching the analog switch inside the machine, four data can be collected synchronously. With the innovation of the wiring method, the following functions are realized: test piece monitoring mode, dual potential monitoring mode, decoupler monitoring mode, constant potentiostat monitoring, synchronous on-off mode and other functions. While ensuring the test accuracy, single-machine measurement, miniaturization and multi-functional integration are realized.

[0129] That is to say, firstly, by integrating multiple monitoring functions into one, one device can meet the monitoring needs of different scenarios, greatly reducing the equipment investment cost. Compared with the existing technology that requires the use of multiple independent instruments, the stand-alone solution of the present invention significantly improves the economic efficiency.

[0130] Secondly, this application reduces the number of wiring terminals to only 4 by optimizing the wiring design, and uses analog switches and different wiring design forms to switch different working modes. This simplified wiring method makes it easier for on-site workers to install and operate the equipment, greatly reducing the testing risks caused by wiring errors and improving work efficiency.

[0131] In addition, this application uses a unified data acquisition instrument to ensure that all monitoring data are collected and recorded within the same time frame. This synchronous acquisition mechanism effectively solves the problem of difficulty in merging and analyzing data between different devices in the prior art, and provides reliable data support for the subsequent comprehensive evaluation of the pipeline corrosion status.

[0132] In summary, the present application has significant advantages in reducing costs, simplifying wiring, improving data synchronization, etc., and effectively solves the shortcomings of the prior art.

[0133] Therefore, compared with the prior art, the data recorder provided by the present application has the following beneficial effects:

[0134] Significant cost-effectiveness: This application integrates the memory, main controller, multi-channel analog-to-digital converter, millivolt terminal, common reference terminal, voltage terminal, and voltage-current terminal into one, realizing the integration of multiple monitoring modes into one. Only one device is needed to complete the tasks of multiple monitoring modes such as decoupler monitoring and constant potentiostat monitoring, which changes the previous situation of requiring multiple independent electrochemical testing instruments, greatly reduces equipment procurement, maintenance and operation costs, greatly improves economic benefits, and provides an effective means for enterprises to reduce pipeline corrosion protection monitoring costs;

[0135] Convenient and efficient operation: With the unique four-terminal design (i.e., millivolt terminal, common reference terminal, voltage terminal, voltage and current terminal) and optimized wiring method, the voltage and current terminals are equipped with analog switches to switch the working mode, which greatly simplifies the equipment wiring process. The difficulty of operation for on-site workers is significantly reduced, effectively avoiding errors caused by complex wiring, improving installation and testing efficiency, ensuring the smooth progress of monitoring work, and reducing downtime and resource waste caused by operational errors;

[0136] Accurate and reliable data: A unified data collection method is adopted to ensure that all monitoring data are acquired and recorded within the same time frame, which effectively solves the problems of time synchronization and combined analysis of data from different devices in the existing technology, laying a solid foundation for the subsequent accurate assessment of pipeline corrosion status, helping engineers to accurately judge the operating status of the pipeline cathodic protection system, timely discover potential corrosion risks, and improve the level of pipeline safety management.

[0137] In other words, this application can achieve the following technical effects:

[0138] Reduce costs: By integrating multiple monitoring modes, users only need to purchase one device to meet multiple monitoring needs, significantly reducing equipment investment costs.

[0139] Simplify wiring and improve on-site implementation efficiency: By optimizing the device structure and interface design, the complexity of wiring is reduced, making it easier for on-site workers to install and operate the equipment, and reducing the risk of testing caused by wiring errors.

[0140] Realize synchronous data collection to facilitate combined analysis: Ensure that all monitoring data are collected and recorded within the same time frame to facilitate subsequent data analysis and comprehensive evaluation, thereby improving the accuracy of judgment on pipeline corrosion status.

[0141] In summary, this application can effectively improve the efficiency and accuracy of pipeline cathodic protection monitoring and meet the industry's demand for high-performance monitoring equipment.

[0142] Each embodiment in this application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the system embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiment.

[0143] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, system, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, system, commodity or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, system, commodity or device including the elements.

[0144] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A data recorder, characterized in that: The data recorder includes a memory, a main controller, a multi-channel analog-to-digital converter, a millivolt terminal, a common reference terminal, a voltage terminal, and a voltage-current terminal; wherein the memory is connected to the main controller, the main controller is connected to the multi-channel analog-to-digital converter, and the multi-channel analog-to-digital converter is respectively connected to the millivolt terminal, the common reference terminal, the voltage terminal, and the voltage-current terminal; The main controller is used to configure the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal according to the target monitoring mode, and to collect data information of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal through the multi-channel analog-to-digital converter, store the data information in the memory, and generate a monitoring result corresponding to the target monitoring mode based on the data information; The memory is used to store the data information and the monitoring results corresponding to the target monitoring mode; The multi-channel analog-to-digital converter is used to collect data information of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal in the target monitoring mode; wherein the multi-channel analog-to-digital converter includes a plurality of analog front ends; The millivolt terminal is used to collect voltage at the millivolt level; The common reference terminal is used to connect to the ground point GND of each analog front end to form a reference loop of the multiple analog front ends; The voltage terminal is used to collect the voltage of the volt level voltage; The voltage and current terminal is used to measure current or voltage.

2. The data recorder according to claim 1, characterized in that The multiple analog front ends include a first voltage analog front end, a second voltage analog front end, a third voltage analog front end and a current analog front end; the first voltage analog front end is connected to the millivolt end, the second voltage analog front end is connected to the voltage end, the third voltage analog front end and the current analog front end are both connected to the voltage and current end through an analog switch, and the analog switch is used to switch the connection between the voltage and current end and the third voltage analog front end and the current analog front end.

3. The data recorder according to claim 2, characterized in that: The target monitoring mode is a test piece monitoring mode; The configuration of the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes: Configure the millivolt terminal to be suspended; Configuring the common reference terminal to connect to the test piece; Configuring the voltage terminal to be connected to a reference electrode; The voltage and current end is configured to be connected to the metal pipeline for transporting oil and gas to be tested; wherein, if the analog switch is connected to the current simulation front end, the voltage and current end measures the current between the test piece and the metal pipeline, and if the analog switch is connected to the third voltage simulation front end, the voltage and current end measures the voltage between the test piece and the metal pipeline, and uses the voltage as the voltage difference between the test piece and the reference electrode.

4. The data recorder according to claim 2, characterized in that: The target monitoring mode is a dual potential monitoring mode; The configuration of the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes: Configure the millivolt terminal to be suspended; Configuring the common reference terminal to be connected to a reference electrode; Configuring the voltage terminal to connect to a first potential monitoring point of the object to be detected; The voltage and current end is configured to be connected to a second potential monitoring point of the object to be detected; wherein the analog switch connects to the third voltage analog front end, and the voltage and current end measures the voltage between the first potential monitoring point and the second potential monitoring point.

5. The data recorder according to claim 2, characterized in that: The target monitoring mode is a decoupler monitoring mode; the configuration of the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes: The millivolt end is configured to be connected to one end of the decoupler connected to the pipeline; wherein one end of the decoupler is connected to the pipeline through a shunt, and the other end of the decoupler is connected to the ground bed; the shunt is used to convert the current into a millivolt voltage drop at both ends of the shunt, and then measure it through the millivolt end; configuring the common reference end to be connected to the pipeline; Configuring the voltage terminal to be connected to a reference electrode; The voltage and current terminal is configured to be connected to the ground bed; wherein, when the analog switch is connected to the third voltage analog front end, the voltage and current terminal measures the voltage between the reference electrode and the ground bed.

6. The data recorder according to claim 2, characterized in that: The target monitoring mode is a constant potential instrument monitoring mode; The configuration of the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes: The millivolt end is configured to be connected to the cathode of the constant potential instrument and to be connected to the pipeline through a shunt; the shunt is used to convert the current into a millivolt voltage drop at both ends of the shunt, and then measure it through the millivolt end; configuring the common reference end to be connected to the pipeline; Configuring the voltage terminal to be connected to a reference electrode; The voltage and current end is configured to be connected to the power-on point of the constant potential instrument, and the power-on point of the constant potential instrument is connected to the pipeline; wherein the analog switch connects to the third voltage analog front end, and the voltage and current end measures the voltage between the reference electrode and the power-on point relative to the pipeline.

7. The data recorder according to claim 2, characterized in that: The target monitoring mode is a synchronous on-off mode; The configuration of the monitoring connection mode of the millivolt terminal, the common reference terminal, the voltage terminal and the voltage and current terminal includes: Configure the millivolt terminal to be suspended; The common reference end is configured to be connected to a metal pipeline for transporting oil and gas to be tested; Configuring the voltage terminal to be connected to a reference electrode; Configure the voltage and current terminals to be left floating The voltage of the reference electrode and the metal pipe is collected through Beidou satellite synchronous timing to monitor the potential.

8. The data recorder according to claim 2, characterized in that: The target monitoring mode is a data line pattern recognition mode, and the data recorder further includes a data port; the monitoring connection mode of configuring the millivolt terminal, the common reference terminal, the voltage terminal, and the voltage and current terminal includes: The millivolt terminal, the common reference terminal connected to the test piece, the voltage terminal, the voltage and current terminal, and the data port are all connected to the in-line EEPROM of the single bus built into the data line to be tested; The data port reads the contents of the in-line EEPROM in a single bus format, identifies the serial number and mode corresponding to the data line based on the contents, and implements mode and harness matching based on the serial number and mode corresponding to the data line.

9. The data recorder according to claim 2, characterized in that: The target monitoring mode is an automatic calibration mode, and the data recorder further includes a data port; the monitoring connection mode of configuring the millivolt terminal, the common reference terminal, the voltage terminal, and the voltage and current terminal includes: The millivolt terminal, the common reference terminal connected to the test piece, the voltage terminal, the voltage and current terminal, and the data port are all connected to the calibration source through a connecting harness; configuring the connection harness to perform single bus communication through the data port and identify a calibration source connection; For each port in the data recorder, the calibration controller in the calibration source controls the connection status of the output voltage and current reference according to time; the calibration source controls the data recorder to enter a preset calibration mode, the calibration source outputs a reference voltage value or a reference current value, and notifies the data recorder to record the reference voltage value or the reference current value through the connecting harness and the data port, and automatically calibrates the port according to the voltage value or current value of the port and the reference voltage value or the reference current value.

10. The data recorder according to claim 2, characterized in that: The multi-channel analog-to-digital converter is an 8-channel analog-to-digital converter.

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