阅读说明：本技术 液体传感器、液体传感器的破损检测装置及破损检测方法 (Liquid sensor, device for detecting breakage of liquid sensor, and method for detecting breakage of liquid sensor ) 是由 李树欣 华凯峰 汪丽艳 于 2020-11-18 设计创作，主要内容包括：本发明的实施例涉及一种传感器,特别涉及一种液体传感器、液体传感器的破损检测装置及破损检测方法,破损检测装置包括：内部电极、外部电极和测量电路；内部电极设置于液体传感器的外壳内,内部电极和外部电极均与测量电路电连接,测量电路与远程设备通讯连接；外部电极和内部电极被壳体隔绝断开,内部电极和外部电极均与测量电路电连接；测量电路用于实时检测外部电极与内部电极之间的电阻值和分压值,测量电路还用于根据检测到的电阻值和分压值变化,判断外壳是否破损,并在判定外壳破损后,向远程设备发出电信号。同现有技术相比,可对液体传感器的外壳是否破损实现不间断的实时监测,并可有效防止误判和漏判的现象。(Embodiments of the present invention relate to a sensor, and more particularly, to a liquid sensor, a damage detection device of the liquid sensor, and a damage detection method of the liquid sensor, the damage detection device including: an inner electrode, an outer electrode and a measurement circuit; the internal electrode is arranged in the shell of the liquid sensor, the internal electrode and the external electrode are both electrically connected with a measuring circuit, and the measuring circuit is in communication connection with remote equipment; the external electrode and the internal electrode are isolated and disconnected by the shell, and both the internal electrode and the external electrode are electrically connected with the measuring circuit; the measuring circuit is used for detecting the resistance value and the voltage dividing value between the external electrode and the internal electrode in real time, and the measuring circuit is also used for judging whether the shell is damaged or not according to the detected change of the resistance value and the voltage dividing value and sending an electric signal to the remote equipment after judging that the shell is damaged. Compared with the prior art, the device can realize uninterrupted real-time monitoring on whether the shell of the liquid sensor is damaged or not, and can effectively prevent the phenomena of misjudgment and missed judgment.)

1. A breakage detection device for a liquid sensor, comprising:

an internal electrode disposed within the housing of the liquid sensor;

an external electrode disposed outside a housing of the liquid sensor;

the measuring circuit is arranged in the shell of the liquid sensor and is in communication connection with the remote equipment;

wherein the outer electrode and the inner electrode are isolated and disconnected by the housing, and both the inner electrode and the outer electrode are electrically connected with the measurement circuit;

the measuring circuit is used for detecting the resistance value and the voltage dividing value between the external electrode and the internal electrode in real time, and the measuring circuit is also used for judging whether the shell is damaged or not according to the detected change of the resistance value and the voltage dividing value, and sending an electric signal to the remote equipment after judging that the shell is damaged.

2. A liquid sensor, comprising:

a housing, comprising: the device comprises a shell and a penetration device, wherein the shell is provided with a first cavity and a second cavity separated from the first cavity along a preset axis direction, and the shell is also provided with an opening communicated with the first cavity; the penetration device is arranged on the shell and closes the opening; the penetration device is used for allowing a target substance in the liquid to be detected to enter the first cavity;

the measuring electrode is arranged in the first cavity, is electrically connected with the measuring circuit and is electrically conducted with a target substance entering the first cavity;

the breakage detection device of claim 1, the internal electrode being disposed within the first cavity and the measurement circuit being disposed within the second cavity.

3. The liquid sensor of claim 2, wherein the housing comprises:

the top plate and the bottom plate are arranged opposite to each other along the preset axis direction;

the side plate is connected with the top plate and the bottom plate and surrounds the top plate and the bottom plate to form an inner cavity;

the partition plate is arranged between the top plate and the bottom plate and divides the inner cavity into the first cavity and the second cavity;

the top plate is provided with the opening communicated with the first cavity, and the penetrating device is arranged on the top plate and seals the opening.

4. The liquid sensor according to claim 3, wherein the internal electrode is provided on a side of the top plate opposite to the bottom plate; alternatively, the first and second electrodes may be,

the internal electrode is disposed inside the side plate.

5. The liquid sensor of claim 4, wherein the inner electrode is disposed inside the side plate and adjacent to the top plate.

6. The liquid sensor according to claim 3, wherein the external electrode is embedded in the side plate;

alternatively, the external electrode is disposed outside the side plate.

7. The liquid sensor according to claim 6, wherein a trace channel for electrically connecting the external electrode with the measurement circuit is further formed in the side plate.

8. The liquid sensor according to claim 3, wherein the measuring electrode is disposed perpendicular to the partition, one end of the measuring electrode is connected to the partition, and the other end of the measuring electrode abuts against the permeation mechanism.

9. The fluid sensor according to any one of claims 1-8, wherein the permeation device is a semi-permeable membrane.

10. A liquid sensor, comprising:

a housing, comprising: the device comprises a shell and a penetration device, wherein the shell is provided with a first cavity and a second cavity separated from the first cavity along a preset axis direction, and the shell is also provided with an opening communicated with the first cavity; the penetration device is arranged on the shell and closes the opening; the penetration device is used for allowing a target substance in the liquid to be detected to enter the first cavity;

the breakage detection device of claim 1, wherein the internal electrode is disposed within the first cavity, the measurement circuit is disposed within the second cavity, and the internal electrode is further configured to be in electrical communication with a target substance entering the first cavity.

11. The liquid sensor of claim 10, wherein the housing comprises:

the top plate and the bottom plate are arranged opposite to each other along the preset axis direction;

the side plate is connected with the top plate and the bottom plate and surrounds the top plate and the bottom plate to form an inner cavity;

the partition plate is arranged between the top plate and the bottom plate and divides the inner cavity into the first cavity and the second cavity;

the top plate is provided with the opening communicated with the first cavity, and the penetrating device is arranged on the top plate and seals the opening.

12. The liquid sensor according to claim 11, wherein the internal electrode is disposed perpendicular to the partition, one end of the internal electrode is connected to the partition, and the other end of the internal electrode abuts against the permeation mechanism.

13. A method for detecting breakage of a liquid sensor, comprising the steps of:

detecting a resistance value and a partial pressure value between an internal electrode arranged in a shell of the liquid sensor and an external electrode arranged outside the shell of the liquid sensor; the outer electrode and the inner electrode are isolated and disconnected by the shell;

judging whether the shell is damaged or not according to the detected change of the resistance value and the detected change of the partial pressure value;

and if the shell is judged to be broken, sending an electric signal to the remote equipment.

14. The method of detecting breakage of a liquid sensor according to claim 13, wherein the step of determining whether or not the housing is broken based on the detected changes in the resistance value and the partial pressure value includes:

comparing the detected resistance value and the detected voltage division value with a preset resistance threshold range and a preset voltage division threshold range respectively in real time;

if the detected resistance value and the detected voltage division value are respectively in the resistance threshold range and the voltage division threshold range, judging that the shell is damaged;

and if the detected resistance value and the detected voltage division value are outside the resistance threshold range and outside the voltage division threshold range, judging that the shell is not damaged.

Technical Field

Embodiments of the present invention relate to a sensor, and more particularly, to a liquid sensor, a breakage detection device for a liquid sensor, and a breakage detection method for a liquid sensor.

Background

The liquid sensor is an electronic sensor capable of measuring physical or chemical properties of liquid, and can convert the physical or chemical properties of the liquid into electrical signals and measure the electrical signals through an electronic device, such as dissolved oxygen, pH value and the like in a water body. The liquid sensor is commonly used for measuring the electrochemical characteristics of water, such as the dissolved oxygen content, ammonia nitrogen ion content and the like of the water, and is widely applied to the fields of environmental protection, aquaculture, sewage treatment and the like. Since liquid sensors are often used in important production and living environments, the reliability of the sensors is very important, but such sensors are often deployed in unattended environments, and often need to work stably for a long time. When the shell of the liquid sensor is damaged, the measurement result of the shell is seriously deviated from the normal value, if the fault cannot be detected, the wrong data can cause serious production accidents.

At present, the housing of a liquid sensor is composed of a metal or plastic shell and a semipermeable membrane. The shell is used for protecting components in the sensor from directly contacting with the measured target liquid, so that interference of physical and chemical factors irrelevant to the measured target is avoided, and the measurement stability and accuracy are improved. The semi-permeable membrane is used for allowing a target substance to enter the inside of the shell of the sensor, and has the characteristics of only allowing a substance equivalent to a target molecule to be measured to enter and isolating a target liquid from directly entering the inside of the shell of the sensor. The liquid sensor has the key point of preventing the measured liquid from directly entering the shell of the sensor in order to keep the accuracy and stability of the measuring result, but in the actual use process, the shell and the semipermeable membrane are likely to be damaged due to the influence of external force or material aging, the measured liquid enters the sensor after being damaged, and the effectiveness of measurement is seriously influenced by the introduced impurities.

The first solution is to continuously track the measurement data of the sensor and process the measurement data, after the measured liquid is infiltrated, the measurement data will sometimes have fluctuation and noise with certain amplitude, and the noise in the measurement data is extracted through digital signal processing, and when the noise exceeds a certain threshold value, the sensor can be considered to be damaged. Although the method does not need to additionally increase a hardware mechanism, a control unit with stronger computing capability is needed, and the method has the advantage of lower hardware cost. However, the phenomenon caused after the measured liquid enters the sensor is uncertain, for example, the waveforms shown after the liquid permeates into the sensor under different water quality environments are different, and sometimes the waveforms are completely indistinguishable from the waveforms measured by a normal sensor, so the scheme has the main defects of poor detection reliability and easy occurrence of misjudgment and missing judgment.

Second, the sensor is calibrated and calibrated after production is complete to determine the measurement results of the sensor in a standard environment, e.g., a dissolved oxygen sensor measures readings in a zero-oxygen environment and a saturated oxygen environment, and the response speed. Another method for determining whether the sensor is damaged is to place the sensor in a standard test environment, calibrate the sensor parameters again, and if the measurement reading of the sensor in the standard environment deviates significantly from the initial value calibrated at the factory, the sensor may be considered to be damaged. However, the method is frequently used in production, but needs a large amount of manual operation, cannot detect faults in real time, can only be found after manual detection in the regular inspection process, cannot monitor in real time, has high requirements on the capability and test conditions of operators, and often needs professional test equipment, so that the implementation cost of the scheme is too high, and the method is difficult to popularize in the field of common production.

Disclosure of Invention

An object of embodiments of the present invention is to provide a liquid sensor, a breakage detection apparatus for the liquid sensor, and a breakage detection method, which can monitor whether a casing of the liquid sensor is broken or not in real time, and can effectively prevent erroneous determination and erroneous determination.

In order to solve the above technical problem, an embodiment of the present invention provides a breakage detection device for a liquid sensor, including:

an internal electrode disposed within the housing of the liquid sensor;

an external electrode disposed outside a housing of the liquid sensor;

the measuring circuit is arranged in the shell of the liquid sensor and is in communication connection with the remote equipment;

wherein the outer electrode and the inner electrode are isolated and disconnected by the housing, and both the inner electrode and the outer electrode are electrically connected with the measurement circuit;

the measuring circuit is used for detecting the resistance value and the voltage dividing value between the external electrode and the internal electrode in real time, and the measuring circuit is also used for judging whether the shell is damaged or not according to the detected change of the resistance value and the voltage dividing value, and sending an electric signal to the remote equipment after judging that the shell is damaged.

In addition, an embodiment of the present invention also provides a liquid sensor including:

a housing, comprising: the device comprises a shell and a penetration device, wherein the shell is provided with a first cavity and a second cavity separated from the first cavity along a preset axis direction, and the shell is also provided with an opening communicated with the first cavity; the penetration device is arranged on the shell and closes the opening; the penetration device is used for allowing a target substance in the liquid to be detected to enter the first cavity;

the measuring electrode is arranged in the first cavity, is electrically connected with the measuring circuit and is electrically conducted with a target substance entering the first cavity;

in the above mentioned breakage detection device, the internal electrode is disposed in the first cavity, and the measurement circuit is disposed in the second cavity.

In addition, an embodiment of the present invention also provides a liquid sensor including:

a housing, comprising: the device comprises a shell and a penetration device, wherein the shell is provided with a first cavity and a second cavity separated from the first cavity along a preset axis direction, and the shell is also provided with an opening communicated with the first cavity; the penetration device is arranged on the shell and closes the opening; the penetration device is used for allowing a target substance in the liquid to be detected to enter the first cavity;

the breakage detection device of claim 1, wherein the internal electrode is disposed within the first cavity, the measurement circuit is disposed within the second cavity, and the internal electrode is further configured to be in electrical communication with a target substance entering the first cavity.

In addition, an embodiment of the present invention further provides a method for detecting breakage of a liquid sensor, including the steps of:

detecting a resistance value and a partial pressure value between an internal electrode arranged in a shell of the liquid sensor and an external electrode arranged outside the shell of the liquid sensor; the outer electrode and the inner electrode are isolated and disconnected by the shell;

judging whether the shell is damaged or not according to the detected change of the resistance value and the detected change of the partial pressure value;

and if the shell is judged to be broken, sending an electric signal to the remote equipment.

Compared with the prior art, the embodiment of the invention has the advantages that the inner electrode and the measuring circuit are arranged inside the shell of the sensor, the outer electrode is arranged outside the shell, the inner electrode and the outer electrode are both electrically connected with the measuring circuit, and the measuring circuit is also in communication connection with the remote equipment, so that in practical application, by means of the conductive property of the liquid to be detected, the resistance value and the partial pressure value between the inner electrode and the outer electrode can be detected by the measuring circuit in real time, whether the shell of the liquid sensor is damaged or not can be judged according to the detected resistance value and the detected partial pressure value, namely, when the shell of the liquid sensor is damaged, the inner electrode and the outer electrode can be electrically conducted by means of the liquid to be detected, the resistance value detected by the detecting circuit can be close to the resistance value of the liquid to be detected, namely, the loop impedance is reduced, and the detected, therefore, the detection circuit can easily realize real-time monitoring on whether the shell of the liquid sensor is damaged or not, and can effectively prevent the phenomena of misjudgment and missed judgment.

In addition, the internal electrode is arranged on one side of the top plate opposite to the bottom plate; alternatively, the first and second electrodes may be,

the internal electrode is disposed inside the side plate.

Or the internal electrode is perpendicular to the partition plate, one end of the internal electrode is connected with the partition plate, and the other end of the internal electrode is abutted to the permeation device.

In addition, the internal electrode is disposed inside the side plate and adjacent to the top plate.

In addition, the external electrode is embedded in the side plate;

alternatively, the external electrode is disposed outside the side plate.

In addition, a wiring channel electrically connected with the external electrode and the measuring circuit is formed in the side plate.

In addition, the measuring electrode is perpendicular to the partition plate, one end of the measuring electrode is connected with the partition plate, and the other end of the measuring electrode is abutted to the penetrating device.

Additionally, the osmotic engine is a semipermeable membrane.

In the step of determining whether the housing is damaged or not according to the detected change in the resistance value and the voltage division value, the method specifically includes:

comparing the detected resistance value and the detected voltage division value with a preset resistance threshold range and a preset voltage division threshold range respectively in real time;

if the detected resistance value and the detected voltage division value are respectively in the resistance threshold range and the voltage division threshold range, judging that the shell is damaged;

and if the detected resistance value and the detected voltage division value are respectively outside the resistance threshold range and outside the voltage division threshold range, judging that the shell is not damaged.

Drawings

Fig. 1 is a schematic structural view of a breakage detection device for a liquid sensor according to a first embodiment of the present invention;

FIG. 2 is a block diagram of a circuit module according to a first embodiment of the present invention;

FIG. 3 is a schematic structural view of a liquid sensor according to a second embodiment of the present invention;

FIG. 4 is a block diagram of a circuit module of a liquid sensor according to a second embodiment of the present invention;

FIG. 5 is a schematic structural view of a liquid sensor according to a third embodiment of the present invention;

FIG. 6 is a block diagram of a circuit module of a liquid sensor according to a third embodiment of the present invention;

fig. 7 is a schematic flow chart illustrating a method for detecting breakage of a liquid sensor according to a fourth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.

A first embodiment of the present invention relates to a breakage detection device for a liquid sensor, as shown in fig. 1, including: an inner electrode 1, an outer electrode 2 and a measuring circuit 3.

In the present embodiment, as shown in fig. 1, the internal electrode 1 is provided inside the housing 4 of the liquid sensor, and the external electrode 2 and the measurement circuit 3 are provided outside the housing 4 of the liquid sensor. Meanwhile, as shown in fig. 2, the internal electrode 1 and the external electrode 2 are both electrically connected to the measurement circuit 3, and in addition, the measurement circuit 3 is also communicatively connected to a remote device.

Further, in the present embodiment, as shown in fig. 1, the external electrode 2 and the internal electrode 1 are isolated and disconnected by the case 4, and as shown in conjunction with fig. 2, both the internal electrode 1 and the external electrode 2 are electrically connected to the measurement circuit 3.

In addition, in practical applications, as shown in fig. 1 and 2, the measuring circuit 3 is configured to detect a resistance value and a voltage division value between the external electrode 2 and the internal electrode 1 in real time, and the measuring circuit 3 is further configured to determine whether the housing 4 is damaged or not according to changes in the detected resistance value and voltage division value, and to send an electrical signal to a remote device after determining that the housing 4 is damaged.

It can be seen from the above that, because the inner electrode 1 and the measuring circuit 3 are disposed inside the housing 4 of the sensor, the outer electrode 2 is disposed outside the housing 4, and the inner electrode 1 and the outer electrode 2 are both electrically connected to the measuring circuit 3, and the measuring circuit 3 is also in communication connection with a remote device, in practical application, by means of the conductive property of the liquid to be measured, the resistance value and the voltage division value between the inner electrode 1 and the outer electrode 2 can be detected by the measuring circuit 3 in real time, and whether the housing 4 of the liquid sensor is damaged or not can be determined according to the detected resistance value and voltage division value changes, that is, when the housing 4 of the liquid sensor is damaged, the inner electrode 1 and the outer electrode 2 can be electrically conducted by the liquid to be measured, so that the resistance value detected by the detecting circuit 3 can approach the resistance value of the liquid to be measured, that the loop impedance at, meanwhile, the detected partial pressure value is reduced, so that the detection circuit 3 can easily realize real-time monitoring on whether the shell 4 of the liquid sensor is damaged or not, and can effectively prevent the phenomena of misjudgment and missed judgment.

A second embodiment of the present invention relates to a liquid sensor, as shown in fig. 3, including: a housing 4, a measuring electrode 5, and a breakage detection device of the first embodiment.

As shown in fig. 3, in the present embodiment, the housing 4 includes: a housing 41 and a permeation device 42. Wherein, the housing 41 has, along the preset axis direction: a first cavity 411, a second cavity 412 separated from the first cavity 411, and an opening 413 communicated with the first cavity 411 is further formed on the housing 41. The penetration means 42 is arranged on the casing 41 and closes the opening 413; the permeation mechanism 42 can be used to allow the target substance in the liquid to be detected to enter the first chamber 411.

Next, as shown in fig. 3 and 4, the measuring electrode 5 is disposed in the first cavity 411 and electrically connected to the measuring circuit 3, and the measuring electrode 5 is also used for electrically connecting to the target substance entering the first cavity, so as to upload the electrochemical characteristic data of the target substance to the measuring circuit 3.

In addition, the internal electrode 1 of the breakage detection device is disposed in the first cavity 411, and the measurement circuit 3 is disposed in the second cavity.

It can be seen from the above that, because the inner electrode 1 and the measuring circuit 3 are disposed inside the housing 4 of the sensor, the outer electrode 2 is disposed outside the housing 4, and the inner electrode 1 and the outer electrode 2 are both electrically connected to the measuring circuit 3, and the measuring circuit 3 is also in communication connection with a remote device, in practical application, the resistance value and the voltage division value between the inner electrode 1 and the outer electrode 2 can be detected by the measuring circuit 3 in real time by virtue of the conductive characteristics of the liquid to be detected, and whether the housing 41 or the penetrating device 42 of the liquid sensor is damaged or not is determined according to the detected resistance value and voltage division value changes, that is, when the housing 41 or the penetrating device 42 of the liquid sensor is damaged and the liquid to be detected flows into the housing 41, the inner electrode 1 and the outer electrode 2 can be electrically conducted by virtue of the liquid to be detected, so that the resistance value detected by the detecting circuit 3 can be close to, that is, the loop impedance is reduced at this time, and the detected partial pressure value is also reduced, so that the detection circuit 3 can easily monitor whether the housing 41 or the permeation mechanism 42 of the liquid sensor is damaged or not in real time, and can effectively prevent the phenomena of erroneous judgment and missing judgment.

Specifically, in the present embodiment, as shown in fig. 3, the housing 41 includes: a top plate 414, a bottom plate 415, side plates 416, and a partition 417. Wherein the top plate 414 and the bottom plate 415 are disposed opposite to each other along a predetermined axial direction, the side plate 416 connects the top plate 414 and the bottom plate 415, and the side plate 416 forms an inner cavity (not shown) between the top plate 414 and the bottom plate 415, and meanwhile, the partition 417 is disposed between the top plate 414 and the bottom plate 415 to divide the inner cavity into the first cavity 411 and the second cavity 412. In addition, an opening 413 communicated with the first cavity 411 is formed in the top plate 414, and the penetration device 42 is arranged on the top plate 414. And closes opening 413. Note that, in the present embodiment, the permeation device 42 is a permeation membrane as shown in fig. 3, but it is needless to say that other permeation mechanisms may be adopted as the permeation device 42 in actual use, and the specific type of the permeation device 42 is not limited in the present embodiment.

In addition, in order to enable the damage to the housing 41 or the permeation mechanism 42 and the liquid to be detected to be flushed into the first cavity 411 to be detected by the internal electrode 1 and the external electrode 2 in time, in the present embodiment, as shown in fig. 3, the internal electrode 1 may be disposed inside the side plate 416, and the external electrode 2 is embedded in the side plate 416. Therefore, when the casing 41 or the penetrating device 42 of the liquid sensor is damaged to cause the liquid to be detected to flow into the casing 41, the internal electrode 1 and the external electrode 2 can be electrically conducted by the liquid to be detected, so that the resistance value detected by the detection circuit 3 can be infinitely close to the resistance value of the liquid to be detected, that is, the loop impedance is reduced, meanwhile, the detected partial pressure value is reduced, and at this time, the detection circuit 3 can send an electric signal to a remote device. And when internal electrode 1 and external electrode 2 were not switched on by the electrical property, the resistance value that detection circuitry 3 detected tended to infinity, and detection circuitry 3 can not send the signal of telecommunication to remote equipment this moment promptly, through this kind of arrangement mode of internal electrode 1 and external electrode 2, can make detection circuitry 3 accessible internal electrode 1 and external electrode 2 easily to casing 41 and whether the infiltration device 42 damaged realization detects.

Also, as a preferable aspect, the internal electrode 1 may be disposed adjacent to the top plate 414, so that the internal electrode 1 may be away from the partition 417, so that the measuring electrode 5 of the liquid sensor of the present embodiment may avoid the influence of the target substance on the internal electrode 1 when detecting the target substance gushing into the permeation mechanism 42. In addition, in practical applications, the internal electrode 1 may be disposed on the side of the top plate 414 opposite to the bottom plate 415, and the external electrode 2 may be disposed directly outside the side plate, and in the present embodiment, the position of the internal electrode 1 in the first cavity 411 and the position of the external electrode 2 outside the housing 41 are not specifically limited.

In addition, it is worth mentioning that a wiring channel (not labeled in the figure) for electrically connecting the external electrode 2 and the measurement circuit 3 is further formed in the side plate 416, and the wiring between the external electrode 2 and the measurement circuit 3 can be facilitated through the wiring channel formed in the side plate 416. In addition, in order to facilitate the detection of the electrochemical characteristics of the target substance by the measuring electrode 5, as shown in fig. 3, the measuring electrode 5 is disposed perpendicular to the partition 417, one end of the measuring electrode 5 is connected to the partition 417, and the other end of the measuring electrode 5 abuts against the permeation device 42, so that the measuring electrode 5 can facilitate the measurement of the electrophysical and chemical parameters of the target substance entering the first cavity 411.

A third embodiment of the present invention relates to a liquid sensor, as shown in fig. 5, including: the housing 4 is the same as the breakage detection device of the first embodiment.

As shown in fig. 5, in the present embodiment, the housing 4 includes: a housing 41 and a permeation device 42. Wherein, the housing 41 has, along the preset axis direction: a first cavity 411, a second cavity 412 separated from the first cavity 411, and an opening 413 communicated with the first cavity 411 is further formed on the housing 41. The penetration means 42 is arranged on the casing 41 and closes the opening 413; the permeation mechanism 42 can be used to allow the target substance in the liquid to be detected to enter the first chamber 411.

Next, as shown in fig. 5 and fig. 6, the internal electrode 1 is disposed in the first cavity 411 and electrically connected to the measurement circuit 3, and the internal electrode 5 is also used for electrically communicating with the target substance entering the first cavity, so as to upload the electrochemical characteristic data of the target substance to the measurement circuit 3.

Specifically, in the present embodiment, as shown in fig. 5, the structure of the housing 41 may be the same as that of the second embodiment, and specifically, the housing 41 may include: a top plate 414, a bottom plate 415, side plates 416, and a partition 417. Wherein the top plate 414 and the bottom plate 415 are disposed opposite to each other along a predetermined axial direction, the side plate 416 connects the top plate 414 and the bottom plate 415, and the side plate 416 forms an inner cavity (not shown) between the top plate 414 and the bottom plate 415, and meanwhile, the partition 417 is disposed between the top plate 414 and the bottom plate 415 to divide the inner cavity into the first cavity 411 and the second cavity 412. In addition, an opening 413 communicated with the first cavity 411 is formed in the top plate 414, and the penetration device 42 is arranged on the top plate 414. And closes opening 413. Note that, in the present embodiment, the permeation device 42 is a permeation membrane as shown in fig. 3, but it is needless to say that other permeation mechanisms may be adopted as the permeation device 42 in actual use, and the specific type of the permeation device 42 is not limited in the present embodiment.

In addition, in order to enable the casing 41 or the permeation device 42 to be damaged and to be detected by the internal electrode 1 and the external electrode 2 in time when the liquid to be detected flows into the first cavity 411, the internal electrode 1 and the target substance entering the first cavity can be electrically conducted. In the present embodiment, as shown in fig. 3, the external electrode 2, the measurement circuit 3 and the housing 41 are connected in the same manner as in the first embodiment, and the corresponding internal electrode 1 is disposed perpendicular to the partition 417, and one end of the internal electrode 1 is connected to the partition 417, and the other end of the internal electrode 1 abuts against the permeation mechanism 42.

As is apparent from the above description, the present embodiment is substantially the same as the second embodiment, and is mainly different in that the measuring electrode in the second embodiment is omitted, and the inner electrode 1 is used as the measuring electrode in the second embodiment. That is, under normal conditions, the electrochemical characteristic data of the target substance can be uploaded to the measuring circuit 3 by the internal electrode 1, and when the casing 41 or the permeation device 42 is damaged, the resistance value detected by the detecting circuit 3 can approach the resistance value of the liquid to be detected, so that the loop impedance is reduced, and the partial pressure value detected by the detecting circuit 3 is reduced accordingly. In this way, the detection circuit 3 can easily monitor whether the housing 41 or the permeation mechanism 42 of the liquid sensor is damaged in real time, and can effectively prevent erroneous judgment and missing judgment.

A fourth embodiment of the present invention relates to a method for detecting breakage of a liquid sensor, as shown in fig. 7, including the steps of:

step 710, detecting a resistance value and a partial pressure value between an internal electrode disposed inside a housing of the liquid sensor and an external electrode disposed outside the housing of the liquid sensor. Wherein the outer electrode and the inner electrode are isolated and disconnected by the housing.

And 720, judging whether the shell is damaged or not according to the detected change of the resistance value and the partial pressure value.

Step 730, after determining that the housing is broken, sends an electrical signal to the remote device, and if determining that the housing is broken, returns to step 720.

It should be noted that, in the step of determining whether the housing is damaged or not according to the detected changes in the resistance value and the voltage division value, that is, step 720, specifically includes:

and comparing the detected resistance and the detected voltage division value with a preset resistance threshold range and a preset voltage division threshold range respectively in real time.

And if the detected resistance value and the detected voltage division value are respectively in the resistance threshold range and the voltage division threshold range, judging that the shell is damaged.

And if the detected resistance value and the detected voltage division value are respectively outside the resistance threshold range and outside the voltage division threshold range, judging that the shell is not damaged.

Specifically, when the casing 41 or the penetrating device 42 of the liquid sensor is damaged to cause the liquid to be detected to flow into the casing 41, the internal electrode 1 and the external electrode 2 can be electrically conducted by the liquid to be detected, so that the resistance value detected by the detection circuit 3 can be infinitely close to the resistance value of the liquid to be detected, and at this time, the detection circuit 3 can send an electrical signal to a remote device. And when internal electrode 1 and external electrode 2 do not switched on by the electrical property, the resistance value that detection circuitry 3 detected tends to infinity, or the resistance value after internal motor 1 and external motor 2 electrical property switched on is great, indicate that casing 41 and penetrant unit 42 at this moment do not appear damaged promptly, detection circuitry 3 can not send the signal of telecommunication to remote equipment this moment promptly, through this kind of arrangement mode of internal electrode 1 and external electrode 2, can make detection circuitry 3 accessible internal electrode 1 and external electrode 2 easily realize detecting whether damaged casing 41 and penetrant unit 42 are damaged.

As is apparent from the above description, the present embodiment is an example of the breakage detection method corresponding to the first, second, and third embodiments, and can be implemented in cooperation with the first, second, and third embodiments. The related technical details mentioned in the first embodiment, the second embodiment and the third embodiment are still valid in the present embodiment, and are not described herein again in order to reduce the repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment, the second embodiment, and the third embodiment.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.