CN208903139U - Liquid level detection device and system - Google Patents
Liquid level detection device and system Download PDFInfo
- Publication number
- CN208903139U CN208903139U CN201821536809.6U CN201821536809U CN208903139U CN 208903139 U CN208903139 U CN 208903139U CN 201821536809 U CN201821536809 U CN 201821536809U CN 208903139 U CN208903139 U CN 208903139U
- Authority
- CN
- China
- Prior art keywords
- liquid level
- module
- relay
- switch
- detection device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model provides a kind of liquid level detection device and system, it is related to the technical field of level sensing, including the first level sensing module, the second level sensing module, switch module and action module, switch module includes first switch and the second switch, action module includes the first action module and the second action module, first level sensing module, first switch and the first action module are sequentially connected and connect, and the second level sensing module, second switch and the second action module are sequentially connected and connect；First level sensing module, in the case where liquid level reaches default upper liquid level, controls corresponding first switch closure, so that the first action module issues the control signal of pumping operation for detecting to liquid level respectively；Second level sensing module, for being detected to liquid level, liquid level reach it is pre- set liquid level in the case where, corresponding second switch closure is controlled respectively, so that the second action module issues the control signal for the operation that discharges water, real-time detection liquid level, and corresponding extraction water operation is carried out in time.
Description
Technical field
The utility model relates to Technology of Level Detection fields, more particularly, to a kind of liquid level detection device and system.
Background technique
The detection of the liquid level information of the large size reservoir impoundment power generation equipment such as reservoir is particularly significant, is related to the behaviour that discharges water that timely draws water
Make, in order to avoid influence working effects and the work safetys such as hydroelectric generation work.
Liquid level monitoring in existing reservoir is more difficult, when liquid level is too high or too low, cannot accordingly be drawn water in time
Discharge water operation, is prone to accidents.
Utility model content
In view of this, the purpose of this utility model is to provide liquid level detection device and system, real-time detection liquid level, and and
The corresponding extraction water operation of Shi Jinhang.
In a first aspect, the utility model embodiment provides a kind of liquid level detection device, comprising: the first level sensing mould
Block, the second level sensing module, switch module and action module, the switch module include first switch and the second switch, institute
State action module include the first action module and the second action module, first level sensing module, the first switch and
First action module, which is sequentially connected, to be connect, second level sensing module, the second switch and the second movement mould
Block, which is sequentially connected, to be connect；
First level sensing module reaches the feelings of default upper liquid level in the liquid level for detecting to liquid level
Under condition, the corresponding first switch of control is closed respectively, so that first action module issues the control letter of pumping operation
Number；
Second level sensing module reaches the pre- feelings for setting liquid level in the liquid level for detecting to liquid level
Under condition, the corresponding second switch of control is closed respectively, so that second action module issues the control letter for the operation that discharges water
Number.
With reference to first aspect, the utility model embodiment provides the first possible embodiment of first aspect,
In, it further include the power module being connected with the level sensing module, the power module includes the transformer for decompression
With the diode for rectification, for providing electric energy.
With reference to first aspect, the utility model embodiment provides second of possible embodiment of first aspect,
In, first level sensing module includes upper liquid level sensor and the first relay control module；
One end of tongue tube in the upper liquid level sensor and the relay in first relay control module
Contact is connected, and the other end of the tongue tube is connected with the power module；
In the case where the liquid level of the upper liquid level sensor detection reaches the default upper liquid level, control described dry
Reed pipe closure so that the coil of the relay in first relay control module obtain it is electric.
With reference to first aspect, the utility model embodiment provides the third possible embodiment of first aspect,
In, second level sensing module includes lower liquid level sensor and the second relay control module；
One end of tongue tube in the lower liquid level sensor and the relay in second relay control module
Contact is connected, and the other end of the tongue tube is connected with the power module；
The liquid level of the lower liquid level sensor detection reach it is described it is pre- set liquid level in the case where, control described dry
Reed pipe closure so that the coil of the relay in second relay control module obtain it is electric.
With reference to first aspect, the utility model embodiment provides the 4th kind of possible embodiment of first aspect,
In, the relay control module include freewheeling diode, triode, protective resistance and the relay coil；
Power supply is accessed in one end of the coil of the cathode of the freewheeling diode and the relay, the freewheeling diode
It is positive to be connected with the other end of the coil with the collector of the triode, the base stage of the triode and protection electricity
One end of resistance is connected, and the other end of the protective resistance is connected with the tongue tube of the liquid level sensor, and described three
The emitter of pole pipe is grounded.
With reference to first aspect, the utility model embodiment provides the 5th kind of possible embodiment of first aspect,
In, the action module includes first resistor, third transistor, third relay and electrolytic capacitor；
One end of the first resistor is connected with the normally opened contact of relay described in the level sensing module respectively,
The other end of the first resistor is connected with the base stage of the third transistor, the collector of the third transistor with it is described
One end of the coil of third relay is connected, the other end of the coil of the third relay respectively with the electrolytic capacitor
Anode is connected with power supply, the cathode ground connection of the electrolytic capacitor.
With reference to first aspect, the utility model embodiment provides the 6th kind of possible embodiment of first aspect,
In, supply voltage is down to 24V from 220V by the transformer by the power module.
With reference to first aspect, the utility model embodiment provides the 7th kind of possible embodiment of first aspect,
In, the first switch and the second switch in the switch module is respectively first level sensing module and second liquid level
The relay normally open contact of relay described in detection module is connected with the coil of the corresponding relay respectively,
The coil of the relay obtain it is electric in the case where, relay normally open contact closure.
With reference to first aspect, the utility model embodiment provides the 8th kind of possible embodiment of first aspect,
In, power supply is accessed in one end of the switch module.
Second aspect, the utility model embodiment also provide a kind of liquid level detection system, including liquid level as described above inspection
Device is surveyed, further includes the actuating mechanism being connected with the liquid level detection device, the actuating mechanism is used for according to the liquid level
The control signal of detection device carries out the movement that discharges water of drawing water.
The utility model embodiment provides a kind of liquid level detection device and system, including the first level sensing module,
Two level sensing modules, switch module and action module, switch module include first switch and the second switch, and action module includes
First action module and the second action module, the first level sensing module, first switch and the first action module are sequentially connected and connect,
Second level sensing module, second switch and the second action module are sequentially connected and connect；First level sensing module, for liquid level
It is detected, in the case where liquid level reaches default upper liquid level, corresponding first switch closure is controlled respectively, so that the first movement
The control signal of module sending pumping operation；Second level sensing module reaches default in liquid level for detecting to liquid level
In the case where lower liquid level, corresponding second switch closure is controlled respectively, so that the second action module issues the control for the operation that discharges water
Signal respectively detects upper and lower liquid level by two liquid level sensors, and carries out corresponding extraction water operation in time, dual
Protection, reduces the generation of accident；
Other feature and advantage of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood and implementing the utility model.The purpose of this utility model and other advantages are illustrating
Specifically noted structure is achieved and obtained in book, claims and attached drawing.
To enable the above objects, features, and advantages of the utility model to be clearer and more comprehensible, preferred embodiment is cited below particularly, and
Cooperate appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of liquid level detection device provided by the embodiment of the utility model.
Icon: the first tongue tube of 2-；The second tongue tube of 3-；The first relay control module of 5-；The control of the second relay of 6-
Module.
Specific embodiment
To keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, below in conjunction with attached drawing to this
The technical solution of utility model is clearly and completely described, it is clear that described embodiment is that the utility model a part is real
Example is applied, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making
Every other embodiment obtained, fall within the protection scope of the utility model under the premise of creative work.
Liquid level monitoring in existing reservoir is more difficult, when liquid level is too high or too low, cannot accordingly be drawn water in time
Discharge water operation, is prone to accidents.
Based on this, a kind of liquid level detection device provided by the embodiment of the utility model and system, real-time detection liquid level, and and
The corresponding extraction water operation of Shi Jinhang.
It is described in detail below by embodiment.
Fig. 1 is a kind of structural schematic diagram of liquid level detection device provided by the embodiment of the utility model.
Referring to Fig.1, liquid level detection device include the first level sensing module, the second level sensing module, switch module and
Action module, switch module include first switch and the second switch, and action module includes the first action module and the second movement mould
Block, the first level sensing module, first switch and the first action module are sequentially connected and connect, and the second level sensing module, second open
It closes and the second action module is sequentially connected and connects；
First level sensing module, for being detected to liquid level, in the case where liquid level reaches default upper liquid level, respectively
Corresponding first switch closure is controlled, so that the first action module issues the control signal of pumping operation；
Second level sensing module, for being detected to liquid level, liquid level reach it is pre- set liquid level in the case where, respectively
Corresponding second switch closure is controlled, so that the second action module issues the control signal for the operation that discharges water.
Specifically, by two liquid level sensors, upper and lower liquid level is detected respectively, and carries out corresponding extraction water in time
Operation, duplicate protection reduce the generation of accident.
It further, further include the power module being connected with level sensing module, power module includes for decompression
Transformer T1 and diode D4, diode D5 for rectification, for providing electric energy.
Further, supply voltage is down to operating voltage 24V from alternating current 220V by transformer by power module, is more pacified
It is complete reliable；
Wherein, the first siding ring of transformer is connected with alternating current, the both ends of second siding ring respectively with diode D4, two
The anode of pole pipe D5 is connected, diode D4, diode D5 cathode respectively with power supply VCC, the first tongue tube 2, the second dry spring
Pipe 3 is connected, the middle ground of second siding ring；
Further, the first level sensing module includes upper liquid level sensor and the first relay control module 5；
One end of tongue tube in upper liquid level sensor is connected with the contact of the relay in the first relay control module 5
It connects, the other end of tongue tube is connected with the power supply module；
In the case where the liquid level of upper liquid level sensor detection reaches default upper liquid level, control tongue tube closure, so that the
The coil of relay in one relay control module 5 obtains electric.
Wherein, the first level sensing module includes upper liquid level sensor and the first relay control module 5, upper level sensing
Device detects liquid level by the first floating ball, when liquid level reaches default upper liquid level, the first tongue tube S1 movement of upper liquid level sensor
Closure so that the first relay control module 5 is enabled, triode Q2 triggering and conducting, the first relay coil KM2 obtain it is electric, first
Relay normally open contact K1 closure；
Further, the second level sensing module includes lower liquid level sensor and the second relay control module 6；
One end of tongue tube in lower liquid level sensor is connected with the contact of the relay in the second relay control module 6
It connects, the other end of tongue tube is connected with the power supply module；
The liquid level of lower liquid level sensor detection reach it is pre- set liquid level in the case where, control tongue tube closure, so that the
The coil of relay in two relay control modules 6 obtains electric.
Further, the first switch K1 in switch module and second switch K2 is respectively the first level sensing module and
The relay normally open contact of relay in two level sensing modules, is connected with the coil of corresponding relay respectively, after
The coil of electric appliance obtain it is electric in the case where, relay normally open contact closure.
Wherein, the second level sensing module includes lower liquid level sensor and the second relay control module 6, lower level sensing
Device detects liquid level by the second floating ball, when liquid level, which reaches, sets liquid level in advance, the second tongue tube S2 movement of lower liquid level sensor
Closure so that the second relay control module 6 is enabled, triode Q3 triggering and conducting, the second relay coil KM3 obtain it is electric, second
Relay normally open contact K2 closure；
Further, relay control module includes the coil of freewheeling diode, triode, protective resistance and relay；
Power supply, anode and the coil of freewheeling diode are accessed in one end of the coil of the cathode and relay of freewheeling diode
The other end is connected with the collector of triode, and the base stage of triode is connected with one end of protective resistance, protective resistance it is another
One end is connected with the tongue tube of liquid level sensor, the emitter ground connection of triode.
Here, the first relay control module 5 includes sustained diode 2, triode Q2, protective resistance R3 and relay
Coil KM2；
Power supply, the anode of sustained diode 2 are accessed in one end of the coil KM2 of the cathode and relay of sustained diode 2
It is connected with the other end of coil KM2 with the collector of triode Q2, the base stage and one end phase of protective resistance R3 of triode Q2
Connection, the other end of protective resistance R3 are connected with the tongue tube S1 of liquid level sensor, the emitter ground connection of triode Q2；
Wherein, the second relay control module 6 includes sustained diode 3, triode Q3, protective resistance R4 and relay
Coil KM3；
Power supply, the anode of sustained diode 3 are accessed in one end of the coil KM3 of the cathode and relay of sustained diode 3
It is connected with the other end of coil KM3 with the collector of triode Q3, the base stage and one end phase of protective resistance R4 of triode Q3
Connection, the other end of protective resistance R4 are connected with the tongue tube S2 of liquid level sensor, the emitter ground connection of triode Q3；
Further, action module includes first resistor, third transistor, third relay and electrolytic capacitor；
One end of first resistor is connected with the normally opened contact of relay in level sensing module respectively, first resistor it is another
One end is connected with the base stage of third transistor, and the collector of third transistor is connected with one end of the coil of third relay
It connects, the other end of the coil of third relay is connected with the anode and power supply of electrolytic capacitor respectively, and the cathode of electrolytic capacitor connects
Ground.
Wherein, the first action module include first resistor R1, third transistor Q4, third relay SRD coil L1 and
Electrolytic capacitor C1；
One end of first resistor R1 is connected with one end of first switch K1, the other end of first resistor R1 and the three or three pole
The base stage of pipe Q4 is connected, and the collector of third transistor Q4 is connected with one end of the coil L1 of third relay SRD, third
The other end of the coil L1 of relay SRD is connected with the anode and power supply VCC of electrolytic capacitor C1 respectively, and electrolytic capacitor C1's is negative
Pole ground connection, the emitter ground connection of the 4th triode Q4.
Wherein, the second action module include second resistance R2, third transistor Q5, third relay SRD coil L2 and
Electrolytic capacitor C2；
One end of first resistor R2 is connected with one end of first switch K2, the other end of first resistor R21 and the three or three
The base stage of pole pipe Q5 is connected, and the collector of third transistor Q5 is connected with one end of the coil L2 of third relay SRD, the
The other end of the coil L2 of three relay SRD is connected with the anode and power supply VCC of electrolytic capacitor C2 respectively, electrolytic capacitor C2's
Cathode ground connection, the emitter ground connection of third transistor Q5.
Further, power supply, i.e. a termination power of first switch K1 and second switch K2 are accessed in one end of switch module
VDD。
Further, the utility model embodiment also provides a kind of liquid level detection system, including liquid level as described above inspection
Device is surveyed, further includes the actuating mechanism being connected with liquid level detection device, actuating mechanism is used for the control according to liquid level detection device
Signal processed carries out the movement that discharges water of drawing water.
Here, upper liquid level and lower liquid level are detected according to liquid level detection device, respectively reaches default liquid level up and down in liquid level
In the case of, corresponding control signal is issued, the movement so that actuating mechanism is drawn water and discharged water further reduces failure generation
Possibility；
Liquid level detection system provided by the embodiment of the utility model has with liquid level detection device provided by the above embodiment
Identical technical characteristic reaches identical technical effect so also can solve identical technical problem.
In the description of the utility model embodiment unless specifically defined or limited otherwise, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in utility model.
It is in the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific
Orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.In addition, term " the
One ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.The apparatus embodiments described above are merely exemplary, for example, the division of the unit,
Only a kind of logical function partition, there may be another division manner in actual implementation, in another example, multiple units or components can
To combine or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or beg for
The mutual coupling, direct-coupling or communication connection of opinion can be through some communication interfaces, device or unit it is indirect
Coupling or communication connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the utility model can integrate in one processing unit,
It can be each unit to physically exist alone, can also be integrated in one unit with two or more units.
Finally, it should be noted that embodiment described above, only specific embodiment of the present utility model, to illustrate this
The technical solution of utility model, rather than its limitations, the protection scope of the utility model is not limited thereto, although referring to aforementioned
The utility model is described in detail in embodiment, those skilled in the art should understand that: it is any to be familiar with this skill
The technical staff in art field within the technical scope disclosed by the utility model, still can be to skill documented by previous embodiment
Art scheme modify or can readily occur in variation or equivalent replacement of some of the technical features；And these modifications,
Variation or replacement, the spirit and model of the utility model embodiment technical solution that it does not separate the essence of the corresponding technical solution
It encloses, should be covered within the scope of the utility model.Therefore, the protection scope of the utility model is answered described is wanted with right
Subject to the protection scope asked.
Claims (10)
1. a kind of liquid level detection device characterized by comprising the first level sensing module, the second level sensing module, switch
Module and action module, the switch module include first switch and the second switch, and the action module includes the first movement mould
Block and the second action module, first level sensing module, the first switch and first action module are sequentially connected
It connects, second level sensing module, the second switch and second action module are sequentially connected and connect；
First level sensing module, for being detected to liquid level, in the case where the liquid level reaches default upper liquid level,
The corresponding first switch closure of control respectively, so that first action module issues the control signal of pumping operation；
Second level sensing module, for being detected to liquid level, the liquid level reach it is pre- set liquid level in the case where,
The corresponding second switch closure of control respectively, so that second action module issues the control signal for the operation that discharges water.
2. liquid level detection device according to claim 1, which is characterized in that further include being connected with the level sensing module
The power module connect, the power module includes the transformer for decompression and the diode for rectification, for providing electric energy.
3. liquid level detection device according to claim 2, which is characterized in that first level sensing module includes upper liquid
Level sensor and the first relay control module；
The contact of relay in one end of tongue tube in the upper liquid level sensor and first relay control module
It is connected, the other end of the tongue tube is connected with the power module；
In the case where the liquid level of the upper liquid level sensor detection reaches the default upper liquid level, the tongue tube is controlled
Closure so that the coil of the relay in first relay control module obtain it is electric.
4. liquid level detection device according to claim 2, which is characterized in that second level sensing module includes lower liquid
Level sensor and the second relay control module；
The contact of relay in one end of tongue tube in the lower liquid level sensor and second relay control module
It is connected, the other end of the tongue tube is connected with the power module；
The liquid level of the lower liquid level sensor detection reach it is described it is pre- set liquid level in the case where, control the tongue tube
Closure so that the coil of the relay in second relay control module obtain it is electric.
5. liquid level detection device according to claim 3 or 4, which is characterized in that the relay control module includes continuous
Flow diode, triode, protective resistance and the relay coil；
Power supply, the anode of the freewheeling diode are accessed in one end of the coil of the cathode of the freewheeling diode and the relay
It is connected with the other end of the coil with the collector of the triode, the base stage of the triode and the protective resistance
One end is connected, and the other end of the protective resistance is connected with the tongue tube of the liquid level sensor, the triode
Emitter ground connection.
6. liquid level detection device according to claim 1, which is characterized in that the action module includes first resistor,
Three triodes, third relay and electrolytic capacitor；
One end of the first resistor is connected with the normally opened contact of relay described in the level sensing module respectively, described
The other end of first resistor is connected with the base stage of the third transistor, the collector of the third transistor and the third
One end of the coil of relay is connected, the other end of the coil of the third relay anode with the electrolytic capacitor respectively
It is connected with power supply, the cathode ground connection of the electrolytic capacitor.
7. liquid level detection device according to claim 2, which is characterized in that the power module will by the transformer
Supply voltage is down to 24V from 220V.
8. liquid level detection device according to claim 3 or 4, which is characterized in that the first switch in the switch module
It is respectively the relay of relay described in first level sensing module and second level sensing module with second switch
Device normally opened contact is connected with the coil of the corresponding relay respectively, electric situation is obtained in the coil of the relay
Under, the relay normally open contact closure.
9. liquid level detection device according to claim 1, which is characterized in that power supply is accessed in one end of the switch module.
10. a kind of liquid level detection system, which is characterized in that including liquid level detection device of any of claims 1-9,
It further include the actuating mechanism being connected with the liquid level detection device, the actuating mechanism is used for according to the liquid level detection device
Control signal carry out the movement that discharges water of drawing water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821536809.6U CN208903139U (en) | 2018-09-19 | 2018-09-19 | Liquid level detection device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821536809.6U CN208903139U (en) | 2018-09-19 | 2018-09-19 | Liquid level detection device and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208903139U true CN208903139U (en) | 2019-05-24 |
Family
ID=66573009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821536809.6U Active CN208903139U (en) | 2018-09-19 | 2018-09-19 | Liquid level detection device and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208903139U (en) |
-
2018
- 2018-09-19 CN CN201821536809.6U patent/CN208903139U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204576796U (en) | Self-cleaning radar meter | |
| CN105756128B (en) | A kind of intelligent air water machine based on Internet of Things | |
| CN208907828U (en) | Liquid level calibrating installation and system | |
| CN208903139U (en) | Liquid level detection device and system | |
| CN208907826U (en) | Level monitoring device and system | |
| CN206074204U (en) | A kind of tank and its turnover water route leak water detdction structure | |
| CN208054943U (en) | Water-shortage protection device and water purifier | |
| CN204166400U (en) | A kind of low-power consumption level alarm for water | |
| CN206441115U (en) | Starting key circuit and electronic equipment | |
| CN206096493U (en) | Ground magnetic induction device and detection terminal | |
| CN104196087A (en) | Water supply device with fault detection function | |
| CN205881149U (en) | Portable multi -functional intelligent display wireless controller | |
| CN204988421U (en) | Electronic type water level alarm | |
| CN209818268U (en) | PCS pump control system | |
| CN208953074U (en) | Novel sewage elevator pump water level monitoring system based on air pressure and level electrode | |
| CN208092205U (en) | A kind of closed-loop detection circuit for detecting relay output state | |
| CN203250192U (en) | Intelligent control system for high-temperature industrial television | |
| CN207380519U (en) | A kind of split controls formula water purifier | |
| CN207764922U (en) | A kind of system of electric power terminal device instruction operation troubles | |
| CN207611102U (en) | A kind of multifunctional electric meter with Temperature and Humidity function | |
| CN207248303U (en) | Grou1ndwater irrigation water level monitoring system | |
| CN206038773U (en) | Earth mat ground resistance tester | |
| CN206113929U (en) | Server alarm device | |
| CN109471462A (en) | A kind of liquid level intelligent monitoring device | |
| CN205280807U (en) | Circuit arrangement with electrification of ground wire detects function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |