CN111556456A - Wireless temperature measuring system and wireless temperature measuring method for electrolytic bath liquid - Google Patents
Wireless temperature measuring system and wireless temperature measuring method for electrolytic bath liquid Download PDFInfo
- Publication number
- CN111556456A CN111556456A CN202010334186.XA CN202010334186A CN111556456A CN 111556456 A CN111556456 A CN 111556456A CN 202010334186 A CN202010334186 A CN 202010334186A CN 111556456 A CN111556456 A CN 111556456A
- Authority
- CN
- China
- Prior art keywords
- module
- wireless
- temperature
- electrolytic bath
- data
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention provides an electrolytic bath liquid wireless temperature measurement system and a wireless temperature measurement method thereof, wherein the system comprises a temperature detection module, a data conversion module, a wireless data transmission module and a sealing module, wherein: the temperature detection module is used for detecting the temperature of the electrolytic bath; the data conversion module converts the temperature data detected by the temperature detection module into a communication protocol signal; the wireless data transmission module sends out the communication protocol signal and can receive the signal; the sealing module seals the data conversion module and the wireless data transmission module. The present invention supports a variety of temperature sensors. The invention provides an RS232 interface, which is convenient to configure; the invention has low power consumption and realizes the maintenance-free function.
Description
Technical Field
The invention relates to the field of metal smelting, in particular to an electrolytic bath liquid wireless temperature measurement system and a wireless temperature measurement method thereof.
Background
In the non-ferrous metal smelting process, the direct current power consumption of electrolysis is in direct proportion to the bath voltage, and the bath temperature of the electrolysis bath directly influences the bath voltage, so whether the bath temperature is controlled properly or not is directly related to the direct current power consumption of the product, and influences the precipitation quality of the product and the service life of the cathode plate and the anode plate. The electrolytic plant environment is poor and is reflected in three aspects: firstly, the air humidity is high; secondly, strong corrosive gas exists; thirdly, the electromagnetic interference is serious. The general electronic products are unstable in operation and have a service life of not more than 3 months. By adopting the traditional scheme of power supply and wired network transmission, the power supply, the switch and the cable are troublesome to install, and the equipment is seriously corroded, so that the service life of the equipment is short and the failure rate is high; the infrared temperature point detector is used for inspection manually, influences on the health of workers and large temperature detection errors are caused. Thus, there has been no suitable solution throughout the industry until the cell temperature of the potroom is detected.
In order to solve the problem of detecting the temperature of the bath solution in an electrolysis workshop, the invention aims to solve the following technical problems:
1. the equipment can reliably work for a long time in high-temperature, high-humidity and strong-corrosion environment. Even if common electronic equipment is coated with three-proofing paint, the common electronic equipment cannot be guaranteed not to be corroded.
2. Low power consumption. The power consumption of the sensor, the transmitter and the wireless communication equipment is not small, and the sensor, the transmitter and the wireless communication equipment can only work for 3 months generally if the low-power-consumption design is not adopted.
4. Problems with configuration settings. If the setting interface is left, the sealing performance cannot be ensured. If a totally-enclosed outer cover is adopted, how to modify the equipment parameters is a problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a wireless temperature measuring system and a wireless temperature measuring method for electrolytic bath liquid.
The invention provides a wireless temperature measurement system for electrolytic bath liquid, which comprises a temperature detection module, a data conversion module, a wireless data transmission module and a sealing module, wherein:
the temperature detection module is used for detecting the temperature of the electrolytic bath;
the data conversion module converts the temperature data detected by the temperature detection module into a communication protocol signal;
the wireless data transmission module sends out the communication protocol signal and can receive the signal;
the sealing module seals the data conversion module and the wireless data transmission module.
Preferably, the temperature detection module comprises a temperature sensor.
Preferably, the data conversion module comprises a temperature transmitter.
Preferably, the data transmission module comprises a wireless communication terminal.
Preferably, the wireless communication terminal comprises a processor module, a radio frequency module, a low noise amplifier module, a power amplifier module and a power supply module, wherein:
the power supply module supplies power to the processor module, the radio frequency module, the low-noise amplifier module and the power amplifier module;
the processor module controls the radio frequency module;
the radio frequency module realizes the receiving and sending of data;
the power amplification module amplifies the signal sent by the radio frequency module and sends the amplified signal outwards;
the low-noise amplifier module amplifies the received signals and sends the amplified signals to the radio frequency module.
Preferably, the sealing module comprises a sealing box, the upper cover of the sealing box is a hinge, and the upper cover of the sealing box is sealed by the hinge when in use.
Preferably, the sealing box is made of plastic acid-resistant materials.
The invention also provides a wireless temperature measurement method based on the wireless temperature measurement system for the electrolytic bath solution, which comprises the following steps:
the method comprises the following initial steps: electrifying the wireless temperature measuring system of the electrolytic bath solution and completing initialization;
a judging step: judging whether external input exists or not, and if not, entering a temperature detection step; if the judgment result is yes, entering a mode switching step;
a mode switching step: judging whether the mode is switched or not, and if so, entering a temperature detection step; if the judgment result is negative, entering an AT mode step;
a temperature detection step: the temperature detection module acquires temperature data, packages the data through the data conversion module, and transmits the data through the wireless data transmission module;
an AT mode step: and judging whether an AT command is input or not, if so, executing the AT command and exiting the AT mode, and if not, directly exiting the AT mode.
Preferably, in the determining step, it is determined whether the time for the external input is 3 s.
The invention also provides a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method as described above.
Compared with the prior art, the invention has the following beneficial effects:
1. the present invention supports a variety of temperature sensors. The hardware of the invention provides various connections, two-wire systems, three-wire systems and four-wire systems supporting PT100 on the aspect of hardware design, corresponds to different measurement precisions, further corresponds to the precision requirements of different application scenes, can be flexibly applied to various scenes with low, medium and high precision requirements on temperature measurement, and can be connected with more various temperature probes;
2. the invention is convenient to configure, and provides an RS232 interface for upgrading firmware or connecting an upper computer to configure various working parameters;
3. the invention has low power consumption, and adopts LPWAN narrowband low-power consumption wireless communication protocol. The invention adopts the LPWAN radio frequency module, greatly reduces the power consumption of the equipment and enables the battery to supply power for more than 1 year.
4. The invention realizes the maintenance-free function, and all detection end equipment of the invention is totally enclosed in a sealing box with high protection level, so that the invention is not afraid of the invasion of corrosive liquid and gas and realizes good protection for electronic equipment.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic system diagram of a wireless temperature measurement system for an electrolytic bath solution provided by the present invention;
FIG. 2 is a schematic view of the internal structure of the wireless temperature measurement system for the electrolytic bath solution provided by the present invention;
FIG. 3 is a flow chart of the steps of the wireless temperature measurement method for the electrolytic bath solution provided by the invention.
The figures show that:
Transmitting antenna 5
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Basic embodiment:
as shown in fig. 1 to 3, the wireless temperature measurement system and the wireless temperature measurement method for the electrolytic bath solution provided by the invention combine the LPWAN wireless communication technology, the low power consumption data acquisition technology and the high protection level anti-corrosion sealing technology, and provide a reliable, accurate, easy-to-deploy and maintenance-free solution for measuring temperature of the electrolytic bath solution for the electrolysis industry. The invention adopts a mode of remotely setting parameters, and all configuration settings are remotely set in a wireless communication mode. The invention comprises a temperature detection module, a data conversion module, a wireless data transmission module and a sealing module, wherein: the temperature detection module is used for detecting the temperature of the electrolytic bath; the data conversion module converts the temperature data detected by the temperature detection module into a communication protocol signal; the wireless data transmission module sends out the communication protocol signal and can receive the signal; the sealing module seals the data conversion module and the wireless data transmission module.
The preferred embodiment is as follows:
preferably, the wireless temperature measurement system for the electrolytic cell provided by the invention comprises a temperature sensor, a temperature transmitter, a wireless communication terminal, a battery, a transmitting antenna and a sealing box, wherein: the temperature sensor adopts a platinum resistor PT100 thermal resistor as a temperature measuring element, and is packaged in a full-sealed way by using 316 stainless steel + PTFT (polytetrafluoroethylene) materials, and the materials have the characteristics of acid resistance, alkali resistance and various organic solvents resistance and are almost insoluble in all solvents. The temperature transmitter and the wireless communication terminal are integrated on a circuit board and comprise a microprocessor unit (MCU), an LPWAN Radio Frequency (RF) unit, a Low Noise Amplifier (LNA), a Power Amplifier (PA), a radio frequency switch (RFswitch), a Power module (Power), a Power Plug (Power _ In Plug), a Power socket (Power _ In Jack), RS232 and a temperature probe interface. The microprocessor unit is internally provided with a communication protocol stack, a transparent transmission program and a peripheral driving program, and the microprocessor is provided with a storage space. The microprocessor is used for controlling data receiving and transmitting of the LPWAN radio frequency unit, packaging data input by the port into a communication protocol format at the transmitting end, unpacking the protocol data at the receiving end, reducing the protocol data into original data and outputting the original data through the port. The LPWAN radio frequency unit is used for processing radio frequency data receiving and transmitting, modulating protocol data sent by the microprocessor unit into radio frequency signals in a transmitting channel, and transmitting the radio frequency signals through a radio frequency circuit at the rear end; and the receiving path is responsible for demodulating and restoring the data received by the radio frequency path into protocol data, and sending the protocol data to the microcontroller unit for further processing. A power amplifier module is connected to a transmitting path at the rear end of the LPWAN radio frequency, and the signal is amplified and then sent to an antenna switch; and the low-noise amplifier module amplifies the weak signal from the antenna in a receiving path so as to process the LPWAN radio frequency circuit at the later stage. The low-noise amplifier and the power amplifier module are connected to the antenna switch module, the antenna switch is responsible for switching of radio frequency transmitting and receiving paths and is also used for switching of different frequency bands, and the antenna switch is connected with the antenna. The power module is responsible for supplying power to all units in the equipment, and comprises a microprocessor unit, an LPWAN radio frequency unit, a low noise amplifier, a power amplifier unit and the like. The interface module comprises an RS232 and a temperature probe which supports a two-wire, three-wire and four-wire mode of the PT100 so as to be used by users in different industries. The sealed box adopts the acid-proof material totally enclosed box, and temperature sensor upper end, changer, wireless communication terminal, battery, antenna are all encapsulated in the sealed box, stop corrosive gas and liquid invasion. The upper cover of the sealing box is a hinge which can be turned over and opened. It is sealed with silica gel during normal use.
The invention also designs a protocol stack supporting LPWAN communication and realizes the automatic multi-point temperature reading. And in the microcontroller, the received and transmitted data is encapsulated and unpacked, and the data encapsulation, the unpackaging and the data verification in the wireless receiving and transmitting process are automatically completed. On the communication protocol, the control of the transmission rate, the power control, the setting of the radio frequency factor, the equipment coding and the like are automatically completed, technicians do not need to learn the complex control protocol of the radio frequency equipment, and the use is very simple and convenient. The method comprises the following specific steps: after the device is powered on, system initialization is completed first, and the state of each register, port and the like are set. The system then waits for about 3 seconds for an external input. If no external input exists, the temperature detection mode is entered by default, the temperature data is read at regular time according to the set parameters, and the temperature data is reported to the server. If the external input is available, judging whether the input symbol is a mode switching command. If no external input exists and the time exceeds 3 seconds, the system automatically enters a temperature detection mode. In the temperature detection mode, whether the temperature probe is normal or not is judged, if the temperature probe is abnormal, the temperature detection is stopped, if the temperature probe is normal, the temperature data is read, the temperature data is packaged through the temperature conversion module, and the temperature data is reported wirelessly. If the AT command is not the mode switching command, the AT mode is entered, whether the AT command is input or not is judged, if the judgment result is yes, the AT command is executed, and if the judgment result is no, the AT mode is directly exited.
The hardware of the invention provides various connections, two-wire systems, three-wire systems and four-wire systems supporting PT100 on the aspect of hardware design, corresponds to different measurement precisions, further corresponds to the precision requirements of different application scenes, can be flexibly applied to various scenes with low, medium and high precision requirements on temperature measurement, and can be connected with more various temperature probes; in addition, an RS232 interface is provided for upgrading the firmware or connecting the upper computer to carry out the configuration of various working parameters. In the aspect of radio frequency, the LPWAN radio frequency module is adopted, so that the power consumption of the equipment is greatly reduced, in addition, the wireless transmission distance is greatly expanded, wireless data transmission of more than several kilometers can be easily carried out, the performance of the wireless transmission technology far exceeds that of Zigbee, WIFI and the like, and the LPWAN radio frequency module is very suitable for being used in the industrial field with serious interference. Traffic charges are also saved as communication is not performed through the operator network. In software design, a series of works such as starting, closing, transmitting, receiving, power control, parameter setting, data encapsulation and the like of communication equipment are automatically completed through a communication protocol program, and for a user, development work is greatly simplified. The temperature probe with corresponding precision can be flexibly applied to industrial temperature measurement sites under various conditions only by being connected, the application is very convenient, and the development period is greatly shortened. And a low-power-consumption circuit and dormancy strategy is adopted, the equipment enters a dormant state in a non-acquisition period, and is automatically awakened at a set time interval to complete a round of temperature detection. Therefore, the problem of ensuring the endurance working time of more than one year under the condition of battery power supply is solved. In addition, the wireless transmission distance is greatly extended, wireless data transmission of more than several kilometers can be easily carried out, the performance of the wireless transmission technology far exceeds that of Zigbee, WIFI and the like, and the method and the device are very suitable for being used in the industrial field with serious interference. Traffic charges are also saved as communication is not performed through the operator network.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. The utility model provides a wireless temperature measurement system of electrolysis trough liquid which characterized in that, includes temperature detection module, data conversion module, wireless data transmission module and sealed module, wherein:
the temperature detection module is used for detecting the temperature of the electrolytic bath;
the data conversion module converts the temperature data detected by the temperature detection module into a communication protocol signal;
the wireless data transmission module sends out the communication protocol signal and can receive the signal;
the sealing module seals the data conversion module and the wireless data transmission module.
2. The wireless temperature measurement system for electrolytic bath liquid according to claim 1, wherein said temperature detection module comprises a temperature sensor.
3. The wireless temperature measurement system for electrolytic bath solution according to claim 1, wherein the data conversion module comprises a temperature transmitter.
4. The wireless temperature measurement system for electrolytic bath liquid according to claim 1, wherein the data transmission module comprises a wireless communication terminal.
5. The wireless temperature measurement system for electrolytic bath liquid according to claim 4, wherein the wireless communication terminal comprises a processor module, a radio frequency module, a low noise amplifier module, a power amplifier module and a power supply module, wherein:
the power supply module supplies power to the processor module, the radio frequency module, the low-noise amplifier module and the power amplifier module;
the processor module controls the radio frequency module;
the radio frequency module realizes the receiving and sending of data;
the power amplification module amplifies the signal sent by the radio frequency module and sends the amplified signal outwards;
the low-noise amplifier module amplifies the received signals and sends the amplified signals to the radio frequency module.
6. The wireless temperature measurement system for electrolytic bath liquid according to claim 1, wherein the sealing module comprises a sealing box, an upper cover of the sealing box is a hinge, and the upper cover of the sealing box is sealed by the hinge when in use.
7. The wireless temperature measurement system for electrolytic bath liquid according to claim 6, wherein said sealed box is made of plastic acid-resistant material.
8. A wireless temperature measurement method based on the wireless temperature measurement system of the electrolytic bath liquid as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
the method comprises the following initial steps: electrifying the wireless temperature measuring system of the electrolytic bath solution and completing initialization;
a judging step: judging whether external input exists or not, and if not, entering a temperature detection step; if the judgment result is yes, entering a mode switching step;
a mode switching step: judging whether the mode is switched or not, and if so, entering a temperature detection step; if the judgment result is negative, entering an AT mode step;
a temperature detection step: the temperature detection module acquires temperature data, packages the data through the data conversion module, and transmits the data through the wireless data transmission module;
an AT mode step: and judging whether an AT command is input or not, if so, executing the AT command and exiting the AT mode, and if not, directly exiting the AT mode.
9. The wireless temperature measurement method according to claim 8, wherein the determining step determines whether the time for which the external input is made is 3 seconds.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method as claimed in claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010334186.XA CN111556456A (en) | 2020-04-24 | 2020-04-24 | Wireless temperature measuring system and wireless temperature measuring method for electrolytic bath liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010334186.XA CN111556456A (en) | 2020-04-24 | 2020-04-24 | Wireless temperature measuring system and wireless temperature measuring method for electrolytic bath liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111556456A true CN111556456A (en) | 2020-08-18 |
Family
ID=72005898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010334186.XA Pending CN111556456A (en) | 2020-04-24 | 2020-04-24 | Wireless temperature measuring system and wireless temperature measuring method for electrolytic bath liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111556456A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767496A (en) * | 2009-01-05 | 2010-07-07 | 黄杰醒 | Device and method for packaging loosen-leaves |
| CN207689030U (en) * | 2017-12-15 | 2018-08-03 | 中国石油天然气股份有限公司 | Temperature transmitter and temperature acquisition system |
| CN108494816A (en) * | 2018-02-06 | 2018-09-04 | 伦图科技（广州）有限公司 | Data transmission method, system, equipment based on LPWAN and readable storage medium storing program for executing |
-
2020
- 2020-04-24 CN CN202010334186.XA patent/CN111556456A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767496A (en) * | 2009-01-05 | 2010-07-07 | 黄杰醒 | Device and method for packaging loosen-leaves |
| CN207689030U (en) * | 2017-12-15 | 2018-08-03 | 中国石油天然气股份有限公司 | Temperature transmitter and temperature acquisition system |
| CN108494816A (en) * | 2018-02-06 | 2018-09-04 | 伦图科技（广州）有限公司 | Data transmission method, system, equipment based on LPWAN and readable storage medium storing program for executing |
Non-Patent Citations (1)
| Title |
|---|
| 高虹: "纳米碳粉制备过程中电解液温度信号检测系统设计", 《中小企业管理与科技(上旬刊)》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102253024B (en) | Optical dissolved oxygen sensor | |
| CN201903403U (en) | Industrial wireless temperature transmitter | |
| CN203376656U (en) | Intelligent integrated control system for grain depot | |
| CN101358947A (en) | Intelligent SF6 gas sensor | |
| CN208239436U (en) | A kind of Water quality ammonia nitrogen detection system | |
| CN111220202A (en) | Dangerous chemical solution safety early warning remote monitoring system and method based on Internet of things | |
| CN103606000A (en) | RFID temperature and humidity sensor tag | |
| CN202710109U (en) | Warehouse temperature and humidity intelligent monitoring system | |
| CN115236135B (en) | Baseline calibration method for gas sensor, control device and gas sensor | |
| CN108382729B (en) | Packaging box with NFC chip and control method thereof | |
| CN111556456A (en) | Wireless temperature measuring system and wireless temperature measuring method for electrolytic bath liquid | |
| CN204259555U (en) | A kind of bean sprout growing machine | |
| CN113110211A (en) | Distributed water quality remote monitoring system and monitoring method for aquaculture fishery | |
| CN109638942B (en) | Passive wireless hydrogen sensing label and system | |
| CN113709594B (en) | Power saving method and system for NB-Iot intelligent water meter and NB-Iot intelligent water meter | |
| CN201269864Y (en) | Intelligent SF6 gas sensor | |
| CN103969413B (en) | For the pilot system of Water Test Kits accelerated life test | |
| CN208888611U (en) | A kind of super low-power consumption control system based on wireless bidirectional communication | |
| CN219612038U (en) | Wireless environment data acquisition terminal | |
| CN202026467U (en) | Soil multi-layer temperature monitoring instrument based on global system for mobile communication | |
| CN217587020U (en) | Soil oxygen content sensor | |
| CN201749098U (en) | Wall body heat resistance multi-point wireless in-site measuring instrument | |
| CN219084811U (en) | Calibration-free gas sensor and calibration-free gas sensor detection system | |
| CN211425509U (en) | Container monitoring terminal | |
| CN216248131U (en) | Current detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200818 |