CN208012710U - A kind of low-consumption wireless level measuring terminal - Google Patents
A kind of low-consumption wireless level measuring terminal Download PDFInfo
- Publication number
- CN208012710U CN208012710U CN201820165206.3U CN201820165206U CN208012710U CN 208012710 U CN208012710 U CN 208012710U CN 201820165206 U CN201820165206 U CN 201820165206U CN 208012710 U CN208012710 U CN 208012710U
- Authority
- CN
- China
- Prior art keywords
- module
- pins
- capacitance
- power supply
- signal
- 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.)
- Expired - Fee Related
Links
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model discloses a kind of low-consumption wireless level measuring terminals.The data acquisition and transmission plan that existing float-ball type level measurement device uses cause its power consumption larger, cannot be satisfied battery powered demand for a long time.The utility model includes signal acquisition module, signal processing module, the first power module and second power supply module.First power module is that signal acquisition module and signal processing module are powered.The second power supply module is wireless communication module power supply.The signal acquisition module acquires the corresponding analog signal of water level information and is transferred to signal processing module；The analog signal that signal acquisition module transmits is converted to digital signal by the signal processing module.The utility model only can need to carry out certain modification to the runner position of original device, can be achieved with the low-power consumption measurement of water level and the wireless upload of data under the premise of not changing existing level measurement device.
Description
Technical field
The utility model belongs to internet of things field, and in particular to a kind of low-consumption wireless level measuring terminal.
Background technology
The size and its situation of change of water level, be Study of The Underground water seepage flow and flood control flood control etc. occasions need it is important according to
According to.Current most popular level measurement device is float-ball type level measurement device, utilizes the movement of floating ball and counter weight
Pulley rotation is driven, by recording the movement angle of pulley with the encoder of pulley coaxle, and then gets corresponding water level value,
And the device completes the data transmission with superior platforms by the way of GSM, the safe and reliable, working life with working method
The advantages that long.As level measuring website is laid with more older more, distribution site is more and more remote, and battery powered is because of its cost
It is cheap, it safeguards the advantages that simple, new resolving ideas is provided for the power supply facilities of level measurement device.But existing float-ball type
The data acquisition and transmission plan that level measurement device uses cause its power consumption larger, cannot be satisfied battery powered need for a long time
It asks.
Invention content
To solve the problems, such as that existing float-ball type level measurement device power consumption is big, the utility model provide a kind of low-power consumption without
Line level measuring terminal.
The utility model includes signal acquisition module, signal processing module, the first power module and second power supply module.Institute
The first power module stated is that signal acquisition module and signal processing module are powered.The second power supply module is wireless communication
Module for power supply.The signal acquisition module acquires the corresponding analog signal of water level information and is transferred to signal processing module；It is described
Signal processing module the analog signal that signal acquisition module transmits is converted into digital signal.
The signal acquisition module includes signal acquisition disk, Hall sensor, pulley, magnet steel, counter weight, floating ball and company
Wiring.The pulley constitutes revolute pair with signal acquisition disk.The both ends of the connecting line are fixed respectively with counter weight, floating ball.
The middle part of the connecting line bypasses pulley.The signal acquisition disk is fixed with to be passed along n circumferentially uniformly distributed Hall of pulley axis
Sensor, 3≤n≤50.There are three magnet steel for the pulley fixation.Three magnet steel are in the 360 °/n angular regions of pulley axis circumferential direction
It is uniformly distributed.The spacing of magnet steel to pulley axis is equal to Hall sensor to the spacing of pulley axis.
Further, the utility model further includes wireless communication module.The wireless communication module uses model
The wireless communication module of BC95B5.Wireless communication module puts down signal processing module processing gained digital data transmission to higher level
Platform.
Further, the signal processing module includes that reference voltage provides circuit, control circuit and storage circuit.Institute
The reference voltage stated provides circuit, and by LC filter circuits, circuit provides reference voltage in order to control.The storage circuit is by depositing
Storage chip is to store through control circuit treated water level information.
Further, it includes inductance L1 that the reference voltage, which provides circuit,.First capacitance of termination of the inductance L1
The power supply output end of C1, the second capacitance C2, one end of third capacitance C3 and the first power module, the 4th capacitance C4 of another termination and
One end of 5th capacitance C5.First capacitance C1, the second capacitance C2, third capacitance C3, the 4th capacitance C4 and the 5th capacitance C5 it is another
One end is grounded.That end of power supply output ends of the inductance L1 far from the first power module provides the reference of circuit as the reference voltage
Voltage output end.
Further, the control circuit includes controller.The model STM8L152C6T6 of the controller；Control
10 pins and 13 pins of device connect the power supply output end of the first power module, and 11 pins and 12 pins connect reference voltage offer
The reference voltage output terminal of circuit, 9 pins and 40 pins are grounded, the first digital-to-analogue conversion pin to the n-th digital-to-analogue conversion pin and n
The signal output end of a Hall sensor is respectively connected with, and 48 pins connect one end of first resistor R1.The other end of first resistor R1
Connect the anode of the first light emitting diode.The cathode of first light emitting diode is grounded.46 pins of controller connect second resistance R2's
One end.The anode of the second light emitting diode of another termination of second resistance R2.The cathode of second light emitting diode is grounded.Controller
44 pins connect one end of crystal oscillator and the 7th capacitance C7,45 pins connect one end of the 6th capacitance C6 and the other end of crystal oscillator.6th
The other end of capacitance C6 and the 7th capacitance C7 are grounded.38 pins of controller connect tongue tube, capacitance C8 and 3rd resistor R3's
One end.The power supply output end of the first power module of another termination of 3rd resistor R3.The other end of tongue tube and capacitance C8 connect
Ground.42 pins of controller connect the data receiver of wireless communication module, and 41 pins connect the data sending terminal of wireless communication module.
IIC communication clock interface of 20 pins of controller as control circuit 22, IIC communication data of 21 pins as control circuit
Interface.
Further, the storage circuit includes storage chip.The model 24C08 of the storage chip.Store core
1 pin, 2 pins, 3 pins and 4 pins of piece are grounded, the IIC communication datas interface and the 5th resistance of 5 pin connection control circuits
One end of R5, the IIC communication clocks interface of 6 pin connection control circuits and one end of the 4th resistance R4,7 pins and the one of capacitance C9
End is connected and is grounded, and 8 pins are connected with the other end of the 5th resistance R5, the 4th resistance R4 and capacitance C9 and connect the first power module
Power supply output end.
Further, the periphery setting of the pulley is fluted.
Further, first power module uses the decompression chip of model HT7533；The second source
Module is depressured chip using the switching mode of model TPS62150.
Further, the Hall sensor uses the Hall sensor of model A3212ELHLTT.N Hall passes
Sensor is connected with the power supply output end of the first power module for electric connection terminal.
The utility model has the beneficial effects that：
1, the utility model can be under the premise of not changing existing level measurement device, only need to be to the pulley of original device
Position carries out certain modification, can be achieved with the low-power consumption measurement of water level and the wireless upload of data,
2, the design that the utility model passes through three magnet steel so that the triggering of Hall sensor is divided into single triggering and two
Two kinds of triggering simultaneously so that acquisition precision is doubled.
Description of the drawings
Fig. 1 is the system block diagram of the utility model；
Fig. 2 is the schematic diagram of first side of signal acquisition module in the utility model；
Fig. 3 is the schematic diagram of second side of signal acquisition module in the utility model；
Fig. 4 is the operating diagram of Hall sensor in the utility model；
Fig. 5 is the system block diagram of signal processing module in the utility model；
Fig. 6 provides the circuit diagram of circuit for reference voltage in the utility model；
Fig. 7 is the circuit diagram of control circuit in the utility model；
Fig. 8 is the circuit diagram of storage circuit in the utility model.
Specific implementation mode
Below in conjunction with attached drawing, the invention will be further described.
As shown in Figure 1, a kind of low-consumption wireless level measuring terminal, including signal acquisition module 1, signal processing module 2,
Wireless communication module 3, the first power module 5 and second power supply module 4.Wireless communication module 3 uses the nothing of model BC95-B5
Line communication module, the module are based on NB_IoT technologies, can complete the wireless data transmission demand of low-power consumption.First power module
5 power for signal acquisition module 1 and signal processing module 2.Second power supply module 4 is powered for wireless communication module 3.Second source
The enabled pin of module 4 is connected with signal processing module 2 so that when wireless communication module 3 needs work, second power supply module 4
Just start power supply.Signal acquisition module 1 acquires the corresponding analog signal of water level information and is transferred to signal processing module 2；Signal
The analog signal that signal acquisition module 1 transmits is converted to digital signal to processing module 2 and module 3 is transferred to by radio communication
Superior platforms.In addition, signal processing module 2 also realizes the service logic control of entire terminal, it is the core of entire terminal.
First power module 5 is using the low-power consumption linear voltage decreasing chip of model HT7533, and second power supply module 4 is using type
Number for TPS62150 switching mode be depressured chip, the first power module 5 and second power supply module 4 are designed with and flow through protection circuit
And overvoltage crowbar, to increase the reliability of terminal.
As shown in Figures 2 and 3, signal acquisition module 1 includes signal acquisition disk 1-1, Hall sensor 1-2, pulley 1-3, magnetic
Steel 1-4, counter weight 1-5, floating ball 1-6 and connecting line 1-7.Hall sensor 1-2 uses the low work(of model A3212ELHLT-T
Consume Hall sensor.Pulley 1-3 is constituted with signal acquisition disk 1-1 using pulley axis as the revolute pair of common axis.Pulley 1-3's
Periphery setting is fluted.The both ends of connecting line 1-7 are fixed respectively with counter weight 1-5, floating ball 1-6.The middle part of connecting line 1-7 bypasses
Pulley 1-3 (to indicate clear in diagram, therefore connecting line is shortened).Floating ball 1-6 is suspended on the water surface in tested waters.Work as the water surface
It rises or falls, floating ball 1-6 can rise or fall accordingly, so that connecting line 1-7 band movable pulley 1-3 rotations.Signal is adopted
Catch basin 1-1 is fixed on the side of pulley 1-3 along eight circumferentially uniformly distributed Hall sensor 1-2 of pulley 1-3 axis.Eight
Hall sensor 1-2's is connected with the power supply output end of the first power module for electric connection terminal.
It is fixed on the side of pulley 1-3 divergence signals acquisition disk 1-1 that there are three magnet steel 1-4.Three magnet steel 1-4 are in pulley 1-
It is uniformly distributed within the scope of the 45° angle of 3 axis circumferential direction that (two i.e. adjacent magnet steel 1-4 are set along the circumferentially-spaced 22.5 ° of angles of pulley 1-3 axis
It sets).The spacing of magnet steel 1-4 to pulley 1-3 axis is equal to Hall sensor 1-2 to the spacing of pulley 1-3 axis.As pulley 1-3
When rotation, magnet steel 1-4 can trigger Hall sensor 1-2 and generate signal.
Since two adjacent magnet steel 1-4 are equal to two adjacent Hall sensors along the angle of pulley 1-3 axis circumferential directions
Halfs of the 1-2 along the angle of pulley 1-3 axis circumferential directions.Therefore the Hall sensor 1-2 being distributed on signal acquisition disk 1-1 has
Two kinds of triggering states as shown in Figure 4：1. is triggered simultaneously there are two adjacent Hall sensor 1-2.2. only there are one suddenly by
Your sensor 1-2 is triggered.The triggering mode of this kind of difference is compared to the case where only there are one magnet steel, by the accuracy of detection of angle
It is doubled, to which the resolution ratio of water level signal be doubled.
As shown in figure 5, signal processing module 2, which includes reference voltage, provides circuit 2-1, control circuit 2-2 and storage circuit
2-3.Reference voltage provides circuit 2-1LC filter circuits (inductance capacitor filtering circuit), and circuit 2-2 provides digital-to-analogue conversion in order to control
When the reference voltage that needs.Storage circuit 2-3 is for storing through control circuit 2-2 treated water level informations.
As shown in fig. 6, it includes inductance L1 that reference voltage, which provides circuit 2-1,.A first capacitance C1 of termination of inductance L1, second
Power supply the output end VCC_MCU, the 4th capacitance C4 of another termination of capacitance C2, one end of third capacitance C3 and the first power module and
One end of 5th capacitance C5.First capacitance C1, the second capacitance C2, third capacitance C3, the 4th capacitance C4 and the 5th capacitance C5 it is another
One end is grounded.That end of power supply output end VCC_MCUs of the inductance L1 far from the first power module provides electricity as the reference voltage
The reference voltage output terminal VDDA of road 2-1.
As shown in fig. 7, control circuit 2-2 includes controller U1.The model STM8L152C6T6 of controller U1；Controller
10 pins and 13 pins of U1 meet the power supply output end VCC_MCU of the first power module, and 11 pins and 12 pins connect reference
The reference voltage output terminal VDDA of circuit for providing voltage 2-1,9 pins and 40 pins are grounded, 24 pins to 31 pins and eight
The signal output end of Hall sensor 1-2 is respectively connected with, and 48 pins connect one end of first resistor R1.The other end of first resistor R1
Connect the anode of the first Light-emitting diode LED 1.The cathode of first Light-emitting diode LED 1 is grounded.46 pins of controller U1 connect
One end of two resistance R2.The anode of the second Light-emitting diode LED of another termination 2 of second resistance R2.Second light emitting diode
The cathode of LED2 is grounded.44 pins of controller U1 connect one end of crystal oscillator Y1 and the 7th capacitance C7, and 45 pins meet the 6th capacitance C6
One end and crystal oscillator Y1 the other end.The other end of 6th capacitance C6 and the 7th capacitance C7 is grounded.38 pins of controller U1
Connect one end of tongue tube k1, capacitance C8 and 3rd resistor R3.The power supply of the first power module of another termination of 3rd resistor R3 is defeated
Outlet VCC_MCU.The other end of tongue tube k1 and capacitance C8 are grounded.Tongue tube is contactless for being provided for installation personnel
Arousal function is triggered, facilitates and carries out installation and debugging work.42 pins of controller U1 connect the data receiver of wireless communication module 3
End, 41 pins connect the data sending terminal of wireless communication module 3.20 pins of controller U1 are communicated as the IIC of control circuit 2-2
Clock interface IIC_SCL, IIC communication data interface IIC_SDA of 21 pins as control circuit 2-2.
As shown in figure 8, storage circuit 2-3 includes storage chip U2.The model 24C08 of storage chip U2.Storage chip
1 pin, 2 pins, 3 pins and 4 pins of U2 are grounded, the IIC communication data interfaces IIC_SDA of 5 pin connection control circuit 2-2
And the 5th resistance R5 one end, the one of IIC the communication clock interface IIC_SCL and the 4th resistance R4 of 6 pin connection control circuit 2-2
End, 7 pins are connected and are grounded with one end of capacitance C9, the other end of 8 pins and the 5th resistance R5, the 4th resistance R4 and capacitance C9
It is connected and connects the power supply output end VCC_MCU of the first power module.
The operation principle of the low-consumption wireless level measuring terminal：
When water level changes, floating ball 1-6 can rise or fall accordingly, so that connecting line 1-7 band movable pulleys 1-3
Rotation.Three magnet steel on pulley trigger Hall sensor during rotation and generate signal, and then obtain pulley rotation
Angle.When water level rises, the rotation direction of pulley is to rotate forward, and when water level decreasing, the rotation direction of pulley is reversion.
After only i-th of Hall sensor is triggered, i-th and j-th of Hall sensor are triggered, then are considered as cunning
Wheel rotates forward 22.5 °；After i-th and j-th of Hall sensor are triggered, only j-th of Hall sensor is triggered, then regards
22.5 ° are rotated forward for pulley；If i < 8, j=i+1；If i=8, j=1.
After only i-th of Hall sensor is triggered, i-th and k-th of Hall sensor are triggered, then are considered as cunning
22.5 ° of wheel reversion；After i-th and k-th of Hall sensor are triggered, only k-th of Hall sensor is triggered, then regards
22.5 ° are inverted for pulley；If i > 1, k=i-1；If i=1, k=8.
Determine that the variation delta h of water level, pulley rotate forward then θ > 0 according to the rotational angle θ of pulley, pulley inverts then θ < 0.
θ/360 Δ h=2 π r.
Claims (9)
1. a kind of low-consumption wireless level measuring terminal, including signal acquisition module, signal processing module, the first power module and
Second power supply module；It is characterized in that：First power module is that signal acquisition module and signal processing module are powered；Institute
The second power supply module stated is wireless communication module power supply；The signal acquisition module acquires the corresponding analog signal of water level information
And it is transferred to signal processing module；The analog signal that signal acquisition module transmits is converted to number by the signal processing module
Signal；
The signal acquisition module includes signal acquisition disk, Hall sensor, pulley, magnet steel, counter weight, floating ball and connection
Line；The pulley constitutes revolute pair with signal acquisition disk；The both ends of the connecting line are fixed respectively with counter weight, floating ball；Institute
The middle part for stating connecting line bypasses pulley；The signal acquisition disk is fixed with along n circumferentially uniformly distributed hall sensing of pulley axis
Device, 3≤n≤50；There are three magnet steel for the pulley fixation；Three magnet steel are equal in the 360 °/n angular regions of pulley axis circumferential direction
Cloth；The spacing of magnet steel to pulley axis is equal to Hall sensor to the spacing of pulley axis.
2. a kind of low-consumption wireless level measuring terminal according to claim 1, it is characterised in that：It further include wireless communication
Module；The wireless communication module uses the wireless communication module of model BC95B5；Wireless communication module is by signal processing
Digital data transmission is to superior platforms obtained by resume module.
3. a kind of low-consumption wireless level measuring terminal according to claim 2, it is characterised in that：The signal processing
Module includes that reference voltage provides circuit, control circuit and storage circuit；The reference voltage provides circuit and is filtered by LC
Circuit provides reference voltage to circuit in order to control；The storage circuit is to store after control circuit is handled by storage chip
Water level information.
4. a kind of low-consumption wireless level measuring terminal according to claim 3, it is characterised in that：The reference voltage
It includes inductance L1 to provide circuit；The inductance L1 one termination the first capacitance C1, the second capacitance C2, third capacitance C3 one end and
The power supply output end of first power module, one end of another termination the 4th capacitance C4 and the 5th the 5th capacitance C5；First capacitance C1,
Second capacitance C2, third capacitance C3, the 4th capacitance C4 and the 5th the 5th capacitance C5 the other end be grounded；Inductance L1 is far from first
That end of the power supply output end of power module provides the reference voltage output terminal of circuit as the reference voltage.
5. a kind of low-consumption wireless level measuring terminal according to claim 3, it is characterised in that：The control circuit
Including controller；The model STM8L152C6T6 of the controller；10 pins and 13 pins of controller connect the first power supply
The power supply output end of module, 11 pins and 12 pins connect the reference voltage output terminal that reference voltage provides circuit, 9 pins and 40
Pin is grounded, and the first digital-to-analogue conversion pin to the n-th digital-to-analogue conversion pin and the signal output end of n Hall sensor distinguish phase
Even, 48 pins connect one end of first resistor R1；The anode of the first light emitting diode of another termination of first resistor R1；First shines
The cathode of diode is grounded；46 pins of controller connect one end of second resistance R2；Another termination second of second resistance R2 is sent out
The anode of optical diode；The cathode of second light emitting diode is grounded；44 pins of controller connect the one of crystal oscillator and the 7th capacitance C7
End, 45 pins connect one end of the 6th capacitance C6 and the other end of crystal oscillator；The other end of 6th capacitance C6 and the 7th capacitance C7 connects
Ground；38 pins of controller connect one end of tongue tube, the 8th capacitance C8 and 3rd resistor R3；Another termination of 3rd resistor R3
The power supply output end of one power module；The other end of tongue tube and the 5th the 8th capacitance C8 are grounded；42 pins of controller connect
The data receiver of wireless communication module, 41 pins connect the data sending terminal of wireless communication module；20 pin conducts of controller
The IIC communication clock interfaces of control circuit 22, IIC communication data interface of 21 pins as control circuit.
6. a kind of low-consumption wireless level measuring terminal according to claim 3, it is characterised in that：The storage circuit
Including storage chip；The model 24C08 of the storage chip；1 pin, 2 pins, 3 pins and 4 pins of storage chip connect
The IIC of ground, the IIC communication datas interface of 5 pin connection control circuits and one end of the 5th resistance R5,6 pin connection control circuits is logical
Believe that clock interface and one end of the 4th resistance R4,7 pins are connected and are grounded with one end of the 9th capacitance C9,8 pins and the 5th electricity
The other end of resistance R5, the 4th resistance R4 and the 9th capacitance C9 are connected and connect the power supply output end of the first power module.
7. a kind of low-consumption wireless level measuring terminal according to claim 1, it is characterised in that：The periphery of the pulley
It is arranged fluted.
8. a kind of low-consumption wireless level measuring terminal according to claim 1, it is characterised in that：First power supply
Module uses the decompression chip of model HT7533；The second power supply module is dropped using the switching mode of model TPS62150
Press chip.
9. a kind of low-consumption wireless level measuring terminal according to claim 1, it is characterised in that：The hall sensing
Device uses the Hall sensor of model A3212ELHLTT；N Hall sensor for electric connection terminal with the first power module
Power supply output end be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820165206.3U CN208012710U (en) | 2018-01-31 | 2018-01-31 | A kind of low-consumption wireless level measuring terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820165206.3U CN208012710U (en) | 2018-01-31 | 2018-01-31 | A kind of low-consumption wireless level measuring terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208012710U true CN208012710U (en) | 2018-10-26 |
Family
ID=63884936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820165206.3U Expired - Fee Related CN208012710U (en) | 2018-01-31 | 2018-01-31 | A kind of low-consumption wireless level measuring terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208012710U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044445A (en) * | 2019-06-04 | 2019-07-23 | 深圳市协润科技有限公司 | A kind of water level monitoring method |
| CN117091673A (en) * | 2023-10-17 | 2023-11-21 | 江苏多维科技有限公司 | Counter weight type liquid level measurement system |
-
2018
- 2018-01-31 CN CN201820165206.3U patent/CN208012710U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044445A (en) * | 2019-06-04 | 2019-07-23 | 深圳市协润科技有限公司 | A kind of water level monitoring method |
| CN117091673A (en) * | 2023-10-17 | 2023-11-21 | 江苏多维科技有限公司 | Counter weight type liquid level measurement system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202066529U (en) | Waterpower and water quality integrative measuring device of water supply pipeline | |
| CN208012710U (en) | A kind of low-consumption wireless level measuring terminal | |
| US20140361908A1 (en) | Wireless utility metering devices, systems, and methods | |
| CN104410164B (en) | Ii type electric energy efficiency management terminal and system | |
| CN103940457B (en) | A kind of low-power consumption of electronic type encoder meter circle realize method | |
| CN103344295A (en) | Electronic water meter | |
| CN107655399A (en) | A kind of multi-turn absolute value encoder and method for detecting position | |
| CN203422127U (en) | Photoelectricity direct reading water meter | |
| CN205726592U (en) | A kind of street lamp control system | |
| CN205300580U (en) | Electric power tower inclination detector | |
| CN204388869U (en) | A kind of magneto-electric absolute value encoder | |
| CN104007320A (en) | Digital RLC tester | |
| CN104142408A (en) | Photoelectric type wind direction and wind speed measuring device | |
| CN204202625U (en) | Electronics multi-turn absolute value encoder | |
| CN207036200U (en) | A kind of instrument character wheel device | |
| CN102128353A (en) | Novel ground marker for detecting flux leakage corrosion of pipeline | |
| CN205679190U (en) | A kind of sensor measuring tower crane rotation angle | |
| CN212518694U (en) | Multi-circle encoder and motor | |
| CN211824560U (en) | Building intelligence pulse measurement water gauge device based on BIM | |
| CN2566226Y (en) | Digital direct-reading device for batching counter | |
| CN107941247A (en) | A kind of passive wake-up formula encoder and method of work | |
| CN204301802U (en) | A kind of intellectual water meter opto-electrical direct reader | |
| CN101520336B (en) | Nanoampere-level micro power-consumption gauge head data acquisition unit | |
| CN202329653U (en) | Novel magnetic motor encoder | |
| CN201034677Y (en) | Ultra-insignificance power consumption combined gas meter data acquisition unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181026 Termination date: 20190131 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |