CN219326841U - Marine environment protected cathode service performance monitoring alarm device - Google Patents
Marine environment protected cathode service performance monitoring alarm device Download PDFInfo
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- CN219326841U CN219326841U CN202320459109.6U CN202320459109U CN219326841U CN 219326841 U CN219326841 U CN 219326841U CN 202320459109 U CN202320459109 U CN 202320459109U CN 219326841 U CN219326841 U CN 219326841U
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Abstract
The utility model provides a marine environment protected cathode service performance monitoring alarm device which comprises a sampling resistor, a voltage sampling device, a temperature sensor, a control module and an alarm, wherein the sampling resistor is connected in series between a sacrificial anode and a protected cathode, and the voltage sampling device is connected with two ends of the sampling resistor in parallel; the temperature sensor is arranged close to the sampling resistor and is used for detecting the temperature T of the surrounding environment of the sampling resistor; the voltage sampling device and the temperature sensor are both connected with the control module through electrical signals, and the control module is connected with the alarm through signals; the control module is used for calculating the actual resistance R of the sampling resistor according to the temperature value measured by the temperature sensor and calculating the actual resistance of the sampling resistor according to the actual resistance of the sampling resistorR calculates the protection current I and the critical current value I when the protection current I and the protected cathode are pitted min And thus controls whether the alarm gives alarm information or not.
Description
Technical Field
The utility model relates to the technical field of cathodic protection and corrosion prevention, in particular to a monitoring and alarming device for service performance of a cathode protected in a marine environment.
Background
In recent years, with the progress of ocean engineering technology in China, ocean platform, submarine pipeline, ocean steel pile and other sea tools are more and more provided, and the sea tools are easy to corrode due to long-term existence in severe ocean environments, so that the corrosion prevention problem of the sea tools is a long-term research hot spot.
The cathodic protection technology is an effective means of corrosion control, and is divided into a sacrificial anode protection technology (namely, a cathodic protection method of a sacrificial anode) and an impressed current protection technology. Among them, the sacrificial anode protection technique is to connect a protected metal (i.e., a protected cathode) with another metal or alloy having a lower electrode potential (i.e., a sacrificial anode), so that the metal or alloy having a low potential is preferentially consumed as an anode, and the protected metal is protected by obtaining a cathode current.
During the process of being consumed, the sacrificial anode generates current, namely protection current, between the protected cathode and the sacrificial anode. When the protected cathode is pitted (also called pitting corrosion), the protection current becomes large, so that by monitoring the magnitude of the protection current, whether the protected cathode is corroded or not can be judged. In order to monitor the magnitude of the protection current, a high-precision sampling resistor is generally connected in series between the protected cathode and the sacrificial anode, the voltage (namely, the partial pressure) at two ends of the sampling resistor is measured through a voltage sampling device, and the ratio of the voltage at two ends of the sampling resistor to the resistance value of the sampling resistor is calculated, so that the magnitude of the protection current is obtained.
Because the sampling resistor is in the marine environment, the temperature change of the external environment is larger, and the change of the environmental temperature has great influence on the actual resistance value of the sampling resistor, thereby influencing the accuracy of the calculated protection current (the protection current is generally calculated by adopting the rated resistance value of the sampling resistor at present), and the corrosion state of the protected cathode cannot be truly reflected.
Disclosure of Invention
The utility model aims to provide a marine environment protected cathode service performance monitoring alarm device which can calculate the actual resistance value of a sampling resistor according to the change of the environmental temperature, so as to obtain an accurate protection current value and avoid the problem of inaccurate measured protection current caused by inaccurate resistance value of the sampling resistor when the external environmental temperature changes.
The utility model provides a marine environment protected cathode service performance monitoring alarm device which is used for detecting protection current I generated between a sacrificial anode and a protected cathode, wherein the sacrificial anode is electrically connected with the protected cathode; the marine environment protected cathode service performance monitoring alarm device comprises a sampling resistor, a voltage sampling device, a temperature sensor, a control module and an alarm, wherein the sampling resistor is used for being connected in series between the sacrificial anode and the protected cathode, the voltage sampling device is connected with two ends of the sampling resistor in parallel, and the voltage sampling device is used for detecting the voltage U at two ends of the sampling resistor; the temperature sensor is arranged close to the sampling resistor and is not in contact with the sampling resistor, and the temperature sensor is used for detecting the temperature T of the surrounding environment of the sampling resistor; the voltage sampling device and the temperature sensor are both connected with the control module through electrical signals, and the control module is connected with the alarm through signals; the control module is used for calculating the actual resistance R of the sampling resistor according to the temperature value measured by the temperature sensor, calculating the protection current I according to the actual resistance R of the sampling resistor, and carrying out pitting corrosion on the protection current I and the protected cathode to obtain a critical current value I min And thus controls whether the alarm gives alarm information or not.
In one implementation manner, the method for calculating the actual resistance R of the sampling resistor includes:
detecting the temperature T of the surrounding environment of the sampling resistor by using the temperature sensor;
when |T-T R When the I is less than M, the actual resistance value R=Ra of the sampling resistor; wherein Ra is the rated resistance value of the sampling resistor, T is R For determination ofThe rated temperature corresponding to the rated resistance value of the sampling resistor is the temperature deviation;
when |T-T R When the I is more than or equal to M, the actual resistance value R=Rb of the sampling resistor; wherein, the Rb= (a) 0 +3.2*10 -6 )+(a 1 -1.6*10 -6 )*(T-T R )+(a 2 -0.5*10 -6 )*(T-T R ) 2 ；a 0 、a 1 And a 2 Are all temperature difference coefficients.
In one implementation, the T R 20℃and M4 ℃.
In one implementation manner, the method for calculating the actual resistance R of the sampling resistor includes:
a data mapping table related to the actual resistance value R of the sampling resistor and the ambient temperature is preset in the control module;
and detecting the temperature T of the surrounding environment of the sampling resistor by using the temperature sensor, and obtaining the actual resistance value R of the sampling resistor corresponding to the temperature sensor by inquiring the data mapping table.
In one implementation, the protection current I is less than a critical current value I at which pitting of the protected cathode occurs min When the alarm sends out alarm information, the alarm sends out alarm information; critical current value I when the protection current I is greater than or equal to the protected cathode pitting min And when the alarm sends out corresponding alarm information.
In one implementation, the sampling resistor is configured to be disposed in seawater, the temperature sensor is configured to be disposed in seawater proximate to the sampling resistor, and the temperature sensor is configured to detect a temperature of the seawater surrounding the sampling resistor.
In an implementation manner, the marine environment protected cathode service performance monitoring and alarming device further comprises a sealed box body, wherein the sampling resistor and the temperature sensor are arranged in the box body, and the temperature sensor is used for detecting the temperature inside the box body.
In one possible way, what isThe rated resistance of the sampling resistor is less than or equal to 2.5 x 10 -6 Small resistance of Ω.
In an implementation manner, the marine environment protected cathode service performance monitoring and alarming device further comprises a communication module, wherein the communication module is in electric signal connection with the control module, and the communication module is in wireless communication connection with the alarm.
In one implementation, the alarm includes a display screen for displaying alarm information, and the control module is connected with the display screen in a wireless communication manner through the communication module.
In one implementation, the number of temperature sensors is one; or the number of the temperature sensors is a plurality, and the temperature sensors are arranged at intervals around the sampling resistor.
According to the marine environment protected cathode service performance monitoring and alarming device, the temperature sensor is arranged, the temperature sensor is utilized to detect the temperature T of the surrounding environment of the sampling resistor, the control module calculates the actual resistance value R of the sampling resistor according to the temperature value detected by the temperature sensor, then calculates the protection current I according to the actual resistance value R of the sampling resistor, and carries out pitting corrosion on the protection current I and the critical current value I of the protected cathode min And thus controls whether the alarm gives alarm information or not. The monitoring and alarming device for the service performance of the marine environment protected cathode can calculate the actual resistance value of the sampling resistor according to the change of the environmental temperature, so that an accurate protection current value is obtained, the problem that the measured protection current I is inaccurate due to the inaccurate resistance value of the sampling resistor when the external environment temperature changes is avoided, the control precision of a system is improved, and whether the protected cathode is corroded or not can be accurately fed back.
Drawings
FIG. 1 is a schematic diagram of the connection relationship between a sampling resistor and a sacrificial anode, a protected cathode and a voltage sampling device according to an embodiment of the present utility model.
Fig. 2 is a schematic diagram of a relative positional relationship between a temperature sensor and a sampling resistor according to an embodiment of the present utility model.
FIG. 3 is a block diagram of a marine environment protected cathode service performance monitoring and alarming device in an embodiment of the utility model.
FIG. 4 is a schematic diagram showing a relative positional relationship between a temperature sensor and a sampling resistor according to another embodiment of the present utility model.
FIG. 5 is a schematic diagram showing a relative positional relationship between a temperature sensor and a sampling resistor according to another embodiment of the present utility model.
FIG. 6 is a schematic diagram of the workflow of the marine environment protected cathode service performance monitoring and alarming device in an embodiment of the utility model.
Detailed Description
The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.
The terms upper, lower, left, right, front, rear, top, bottom and the like (if any) in the description and in the claims are used for descriptive purposes and not necessarily for describing relative positions of structures in the figures and in describing relative positions of structures. It should be understood that the use of directional terms should not be construed to limit the scope of the application as claimed.
As shown in fig. 1 to 3, an embodiment of the present utility model provides a marine environment protected cathode service performance monitoring alarm device for detecting a protection current I generated between a sacrificial anode 91 and a protected cathode 92, wherein the sacrificial anode 91 is electrically connected with the protected cathode 92. The protected cathode 92 can be a marine equipment such as an ocean platform, a submarine pipeline, a marine steel pile and the like, and the protected cathode 92 is at least partially positioned in seawater, the sacrificial anode 91 is arranged in the seawater, and a primary cell loop is formed between the protected cathode 92 and the sacrificial anode 91 through the seawater environment, so that current, namely protection current I, can be generated between the protected cathode 92 and the sacrificial anode 91 in the consumed process of the sacrificial anode 91.
The marine environment protected cathode service performance monitoring alarm device comprises a sampling resistor 1, a voltage sampling device 2, a temperature sensor 3, a control module 4 and an alarm 5. The sampling resistor 1 is used to be connected in series between the sacrificial anode 91 and the protected cathode 92, the voltage sampling device 2 is connected in parallel with two ends of the sampling resistor 1 (i.e. a first end of the voltage sampling device 2 is connected with the first end of the sampling resistor 1, a second end of the voltage sampling device 2 is connected with the second end of the sampling resistor 1), and the voltage sampling device 2 is used to detect the voltage U across the sampling resistor 1 (i.e. the voltage division of the sampling resistor 1). The temperature sensor 3 is disposed near the sampling resistor 1, and the temperature sensor 3 is not in contact with the sampling resistor 1 (to avoid affecting the resistance of the sampling resistor 1), and the temperature sensor 3 is used for detecting the temperature T of the surrounding environment of the sampling resistor 1.
The voltage sampling device 2 and the temperature sensor 3 are both in electrical signal connection with the control module 4, and the control module 4 is in signal connection with the alarm 5; the control module 4 is used for calculating the actual resistance R of the sampling resistor 1 according to the temperature value measured by the temperature sensor 3, calculating the protection current I according to the actual resistance R of the sampling resistor 1, and calculating the critical current value I when the protection current I and the protected cathode 92 are pitted min (critical current value I) min And can be obtained through engineering simulation test) so as to control whether the alarm 5 sends alarm information or not.
Specifically, according to practical engineering experience, when pitting (also called pitting) occurs in the protected cathode 92, the protection current I becomes large; so that when the protected cathode 92 is about to be pitted, a critical current I exists between the protected cathode 92 and the sacrificial anode 91 min (i.e., the minimum current value at which pitting of the protected cathode 92 will occur), the critical current value I min Can be obtained through engineering simulation test. By monitoring the magnitude of the protection current I and comparing the protection current I with the critical current value I min The comparison is performed so as to judge whether the protected cathode is corroded or not, and whether the alarm 5 sends out alarm information or not is controlled according to the judgment result.
According to the marine environment protected cathode service performance monitoring and alarming device provided by the embodiment of the utility model, the temperature sensor 3 is arranged, the temperature sensor 3 is utilized to detect the temperature T of the surrounding environment of the sampling resistor 1, the control module 4 calculates the actual resistance R of the sampling resistor 1 according to the temperature value measured by the temperature sensor 3, then calculates the protection current I according to the actual resistance R of the sampling resistor 1, and carries out pitting corrosion on the protection current I and the critical current value I when the protected cathode 92 is pitted min To control whether the alarm 5 emits alarm information. The monitoring and alarming device for the service performance of the marine environment protected cathode can calculate the actual resistance value of the sampling resistor 1 according to the change of the environmental temperature, so that an accurate protection current value is obtained, the problem that the measured protection current I is inaccurate due to the inaccurate resistance value of the sampling resistor 1 when the external environmental temperature changes is avoided, the control precision of a system is improved, and whether the protected cathode 92 is corroded or not can be accurately fed back.
As one embodiment, the protection current I is less than the critical current value I at which pitting of the protected cathode 92 occurs min If the cathode 92 is not pitted, the alarm 5 does not send out alarm information; critical current value I when protection current I is greater than or equal to that at which pitting of protected cathode 92 occurs min When the protected cathode 92 is considered to have pitted or is about to pitted, the control module 4 controls the alarm 5 to send out corresponding alarm information.
As one embodiment, the method for calculating the actual resistance R of the sampling resistor 1 includes:
detecting the temperature T of the surrounding environment of the sampling resistor 1 by using a temperature sensor 3;
when |T-T R When the I is less than M, the actual resistance value R=Ra of the sampling resistor 1; wherein Ra is the rated resistance value of the sampling resistor 1, T R For determining the rated temperature corresponding to the rated resistance of the sampling resistor 1 (i.e. the rated resistance of the sampling resistor 1 is at the rated temperature T R Ra and T, measured as follows R Related to the selected model of the sampling resistor 1), M is the temperature deviation. I.e. when the temperature T of the surrounding environment of the sampling resistor 1 is equal to the rated temperature T R Differences betweenWhen the value is smaller, the rated resistance Ra of the sampling resistor 1 can be taken as the actual resistance R;
when |T-T R When the I is not less than M, the actual resistance value R=Rb of the sampling resistor 1; wherein, the Rb= (a) 0 +3.2*10 -6 )+(a 1 -1.6*10 -6 )*(T-T R )+(a 2 -0.5*10 -6 )*(T-T R ) 2 ；a 0 、a 1 And a 2 Are all temperature difference coefficients. I.e. when the temperature T of the surrounding environment of the sampling resistor 1 is equal to the rated temperature T R When the difference is large, the actual resistance R of the sampling resistor 1 is greatly different from the rated resistance Ra thereof, so that the value of R needs to be calculated by the calculation formula of Rb to reduce the error.
The Rb calculation formula is obtained by combining a Chebyshev approximation method and engineering simulation data, and can reduce the influence of the ambient temperature on the calculation of the resistance value of the sampling resistor 1. Wherein a is as defined above 0 、a 1 And a 2 Can be calculated from actual engineering simulation data, for example: testing two or more groups of Rb and T related data, and substituting into the Rb calculation formula to calculate to obtain a 0 、a 1 And a 2 Is a value of (2).
As one embodiment, the T is R 20 ℃, and M is 4 ℃, namely:
when |T-20| < 4, the actual resistance value R=Ra of the sampling resistor 1;
when the absolute value T-20 is more than or equal to 4, the actual resistance value R=Rb of the sampling resistor 1; the rb= (a) 0 +3.2*10 -6 )+(a 1 -1.6*10 -6 )*(T-20)+(a 2 -0.5*10 -6 )*(T-20) 2 。
Of course, in other embodiments, T R And M can be other values, which can be adjusted according to the actual situation.
As another embodiment, the method for calculating the actual resistance R of the sampling resistor 1 includes:
a data mapping table (for example, corresponding data of R and temperature in a temperature range of 0-40 ℃) of the actual resistance value R of the sampling resistor 1 and the ambient temperature is preset in the control module 4;
the temperature sensor 3 detects the temperature T of the surrounding environment of the sampling resistor 1, and the actual resistance R of the sampling resistor 1 corresponding to the temperature T is obtained by inquiring the data mapping table. Compared with the formula calculation mode, the calculation result of the lookup table is more accurate, but a large amount of data is required to be measured in advance.
As an embodiment, the data mapping table may be, for example (taking the corresponding data relationship between R and T in the temperature range of 0-40 ℃ as an example; of course, in other examples, the temperature range may be reduced or expanded as required):
as one embodiment, the sampling resistor 1 has a rated resistance value of less than or equal to 2.5×10 -6 The small-resistance resistor of omega reduces the influence of the sampling resistor 1 on the protection current I as much as possible, and avoids the influence on the protection effect of the protected cathode 92 caused by the reduction of the protection current I due to the overlarge resistance value of the sampling resistor 1.
As shown in fig. 2, as an embodiment, the sampling resistor 1 is used to be disposed in the sea water, the temperature sensor 3 is used to be disposed in the sea water near the sampling resistor 1, and the temperature sensor 3 is used to detect the sea water temperature around the sampling resistor 1, that is, both the sampling resistor 1 and the temperature sensor 3 are exposed to the sea water. The arrangement mode is simpler, but the sampling resistor 1 and the temperature sensor 3 are required to have good corrosion resistance and other performances. Meanwhile, the temperature sensor 3 can be arranged in the seawater in a concurrent or top flow mode, so that side flow arrangement is avoided, the impact force of the seawater received by the temperature sensor 3 is reduced, and the stability of the seawater is ensured.
As shown in fig. 4, as another embodiment, the marine environment protected cathode service performance monitoring and alarming device further comprises a sealed box body 7, wherein the sampling resistor 1 and the temperature sensor 3 are arranged in the box body 7, and the temperature sensor 3 is used for detecting the temperature inside the box body 7. Because sampling resistor 1 and temperature sensor 3 all set up in sealed box 7, can reduce the sea water corruption that sampling resistor 1 and temperature sensor 3 received and the adhesion of marine microorganism, improve its detection accuracy to prolong its life.
As shown in fig. 2, the number of temperature sensors 3 is one as one embodiment.
As shown in fig. 5, as another embodiment, the number of the temperature sensors 3 is plural (two are shown in the figure, and more temperature sensors may be actually provided), the plural temperature sensors 3 are disposed at intervals around the sampling resistor 1, and the plural temperature sensors 3 are electrically connected to the control module 4. By providing a plurality of temperature sensors 3, it is possible to avoid the problem of failure in reading data due to failure of one of the temperature sensors 3, and to improve accuracy of temperature detection (for example, taking an average value of readings of several temperature sensors 3); the setting mode can be used for monitoring the protection object with emphasis.
As shown in fig. 3, as an implementation manner, the marine environment protected cathode service performance monitoring and alarming device further comprises a communication module 6, wherein the communication module 6 is in electrical signal connection with the control module 4, the communication module 6 is in wireless communication connection with the alarm 5, i.e. the control module 4 is in wireless communication connection with the alarm 5 through the communication module 6.
Specifically, since the alarm 5 is generally disposed in a monitoring room on land, the alarm signal can be remotely transmitted to the alarm 5 by disposing the communication module 6, thereby realizing the function of remote monitoring.
As an embodiment, the alarm 5 includes a display screen (not shown) for displaying alarm information, and the control module 4 is connected to the display screen in a wireless communication manner through the communication module 6. Of course, the alarm 5 may also be an audible and visual alarm device, etc.
As shown in fig. 3, as an implementation manner, the cathode service performance monitoring and alarming device for marine environment protection further comprises an industrial tablet computer 8, the control module 4 is connected with the industrial tablet computer 8 through the communication module 6 in a wireless communication manner, and a user can view, modify, store monitoring data, set values and the like through the industrial tablet computer 8.
As shown in fig. 6, as an implementation manner, the working flow of the marine environment protected cathode service performance monitoring and alarming device is as follows:
1. the voltage U at two ends of the sampling resistor 1 is detected by a voltage sampling device 2, and the temperature T of the surrounding environment of the sampling resistor 1 is detected by a temperature sensor 3;
2. according to the ambient temperature T detected by the temperature sensor 3, calculating the actual resistance R of the sampling resistor 1 by the formula method or the table look-up method;
3. calculating a protection current I according to a formula U/R, and then comparing the protection current I with a critical current value I min Comparing the sizes of the two; if the protection current I is smaller than the critical current value I min The alarm 5 does not send out alarm information; if the protection current I is greater than or equal to the critical current value I min The alarm 5 sends out corresponding alarm information.
According to the marine environment protected cathode service performance monitoring and alarming device provided by the embodiment of the utility model, the temperature sensor 3 is arranged, the temperature sensor 3 is utilized to detect the temperature T of the surrounding environment of the sampling resistor 1, the control module 4 calculates the actual resistance R of the sampling resistor 1 according to the temperature value measured by the temperature sensor 3, then calculates the protection current I according to the actual resistance R of the sampling resistor 1, and carries out pitting corrosion on the protection current I and the critical current value I when the protected cathode 92 is pitted min To control whether the alarm 5 emits alarm information. The monitoring and alarming device for the service performance of the marine environment protected cathode can calculate the actual resistance value of the sampling resistor 1 according to the change of the environmental temperature, so that an accurate protection current value is obtained, the problem that the measured protection current I is inaccurate due to the inaccurate resistance value of the sampling resistor 1 when the external environmental temperature changes is avoided, the control precision of a system is improved, and whether the protected cathode 92 is corroded or not can be accurately fed back.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims (8)
1. The marine environment protected cathode service performance monitoring alarm device is used for detecting a protection current I generated between a sacrificial anode (91) and a protected cathode (92), wherein the sacrificial anode (91) is electrically connected with the protected cathode (92), and is characterized by comprising a sampling resistor (1), a voltage sampling device (2), a temperature sensor (3), a control module (4) and an alarm (5), the sampling resistor (1) is used for being connected in series between the sacrificial anode (91) and the protected cathode (92), the voltage sampling device (2) is connected with two ends of the sampling resistor (1) in parallel, and the voltage sampling device (2) is used for detecting the voltage U at two ends of the sampling resistor (1); the temperature sensor (3) is arranged close to the sampling resistor (1), the temperature sensor (3) is not in contact with the sampling resistor (1), and the temperature sensor (3) is used for detecting the temperature T of the surrounding environment of the sampling resistor (1); the voltage sampling device (2) and the temperature sensor (3) are both connected with the control module (4) through electrical signals, and the control module (4) is connected with the alarm (5) through signals; the control module (4) is used for calculating the actual resistance value R of the sampling resistor (1) according to the temperature value measured by the temperature sensor (3), calculating the protection current I according to the actual resistance value R of the sampling resistor (1), and calculating the critical current value I when the protection current I and the protected cathode (92) are subjected to pitting corrosion min To control whether the alarm (5) gives an alarm message.
2. The marine environment protected cathode service performance monitoring alarm device of claim 1, wherein the protection current I is less than a critical current value I when pitting of the protected cathode (92) occurs min When the alarm device (5) does not send out alarm information; critical current value I when the protection current I is greater than or equal to the pitting corrosion of the protected cathode (92) min And when the alarm device (5) sends out corresponding alarm information.
3. Marine environment protected cathode service performance monitoring alarm device according to claim 1, characterized in that the sampling resistor (1) is arranged in sea water, the temperature sensor (3) is arranged in sea water close to the sampling resistor (1), and the temperature sensor (3) is arranged to detect the sea water temperature around the sampling resistor (1).
4. The marine environment protected cathode service performance monitoring and alarming device according to claim 1, further comprising a sealed box body (7), wherein the sampling resistor (1) and the temperature sensor (3) are both arranged in the box body (7), and the temperature sensor (3) is used for detecting the temperature inside the box body (7).
5. The marine environment protected cathode service performance monitoring and alarming device according to claim 1, wherein the sampling resistor (1) has a rated resistance value of less than or equal to 2.5 x 10 -6 Small resistance of Ω.
6. The marine environment protected cathode service performance monitoring and alarming device according to claim 1, further comprising a communication module (6), wherein the communication module (6) is electrically connected with the control module (4), and the communication module (6) is in wireless communication connection with the alarm (5).
7. The marine environment protected cathode service performance monitoring alarm device according to claim 6, wherein the alarm (5) comprises a display screen for displaying alarm information, and the control module (4) is in wireless communication connection with the display screen through the communication module (6).
8. Marine environment protected cathode service performance monitoring alarm device according to claim 1, characterized in that the number of temperature sensors (3) is one; alternatively, the number of the temperature sensors (3) is plural, and the plurality of the temperature sensors (3) are arranged at intervals around the outer periphery of the sampling resistor (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320459109.6U CN219326841U (en) | 2023-03-12 | 2023-03-12 | Marine environment protected cathode service performance monitoring alarm device |
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| CN202320459109.6U CN219326841U (en) | 2023-03-12 | 2023-03-12 | Marine environment protected cathode service performance monitoring alarm device |
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