CN103018780A - Probe-type high-frequency-response liquid metal leakage detector - Google Patents
Probe-type high-frequency-response liquid metal leakage detector Download PDFInfo
- Publication number
- CN103018780A CN103018780A CN2012105916195A CN201210591619A CN103018780A CN 103018780 A CN103018780 A CN 103018780A CN 2012105916195 A CN2012105916195 A CN 2012105916195A CN 201210591619 A CN201210591619 A CN 201210591619A CN 103018780 A CN103018780 A CN 103018780A
- Authority
- CN
- China
- Prior art keywords
- probe
- output
- liquid metal
- main control
- input
- 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.)
- Granted
Links
Images
Abstract
The invention provides a probe-type high-frequency-response liquid metal leakage detector. The probe-type high-frequency-response liquid metal leakage detector comprises an output probe, an input probe, an output probe fixing clamp, an input probe fixing clamp, a 24V direct-current power supply, a main control circuit board and a connecting terminal, wherein the connecting terminal led out by the main control circuit board is connected with the output probe and the input probe, and the output probe and the input probe are fixed at liquid metal leakage positions by the fixing clamps. When liquid metal leaks, the output probe and the input probe can be conducted, the main control circuit board can be triggered during conduction, and the main control circuit board outputs conduction signals for use of other detection equipment. Besides, the main control circuit board can cut off output signals of the output probe within 10 microseconds, so that the problem that operation of other sensors contacting with the liquid metal or a pipeline is affected due to electrification of the whole liquid metal and a pipeline thereof caused by the signals of the output probe is prevented. The probe-type high-frequency-response liquid metal leakage detector is capable of rapidly detecting leakage, outputting leakage signals and timely cutting off output of the probe signals generated due to liquid metal conduction.
Description
Technical field
The invention belongs to liquid metal leakage measuring instrumentation technical field, be specifically related to a kind of probe-type, high frequency sound liquid metal leakage measuring instrumentation device.
Background technology
Liquid metal is the metal of high conductivity, and its leakage measuring instrumentation method mainly contains gravity pallet and two kinds of methods of probe at present.
The principle that the gravity pallet detects the liquid metal leakage is: after leaking appears in liquid metal, it can drop on the gravity pallet under Action of Gravity Field, this moment, the quality of pallet can increase, thereby the output corresponding signal just can obtain the signal that liquid metal leaks to checkout equipment.Whether its advantage is: can adapt to the request for utilization of rugged surroundings, and have liquid metal to leak in can detecting on a large scale.But there is following shortcoming in it:
(1) online dynamic responding speed is slow, because this kind detection method only drops on the gravity pallet at liquid metal and can detect leakage signal, drop to pallet and need the regular hour and leak into from liquid metal, thereby can not detect liquid metal the very first time leaks;
Whether (2) can not obtain accurately the leakage point position, have liquid metal to leak in a certain scope and the zone because this kind detection method normally detects, the liquid metal that can not accurately detect a certain position leaks.
The principle that traditional probe-type detects the liquid metal leakage is: probe is arranged in position that leakage easily occurs for some, when having liquid metal to leak, two electrodes of meeting conducting probe, thus the output corresponding signal just can obtain the signal of liquid metal to checkout equipment.Its advantage is: can detect accurately a certain position and liquid metal leakage, rapid dynamic response speed whether occur.But traditional probe-type detects the method for liquid metal leakage exists following shortcoming:
(1) after the probe conducting, can make liquid metal or pipeline charged, arrange superincumbent working sensor thereby affect other.This be because, when liquid metal leaks two electrodes of conducting probe, at this moment, whole pipeline is also thereupon charged, though can be zero with these current potential pincers by the mode of ground connection, but because pipeline or the distributed capacitance of metal itself and the existence of internal resistance can make it still with certain voltage, this voltage signal can have influence on other working sensor that directly is arranged in its pipeline top;
(2) the fixing comparatively trouble of probe, will make on the one hand probe can detect timely liquid metal leaks, this just requires the probe can not be too far away apart from leakage point or pipeline, probe will be guaranteed on the other hand in the situation that vibration or fluctuation appear in pipeline, can not depart from former point of fixity, in case terminate in tube contacts or probe two electrode contacts, thereby cause false triggering.Arrangement requirement two probe electrodes of probe namely can not too far again can not be too near as can be known by above 2, and it is cumbersome installing like this.
To sum up, the drawbacks limit of above measuring method its usable range.Device of the present invention also is to utilize the probe-type liquid metal to leak, but it has overcome the shortcoming of conventional probe formula liquid metal Leak Detection, makes its scope of application wider, safeguard convenient, and can integrated multiple spot liquid metal leak detecting device.
Summary of the invention
The object of the invention is to design a kind of simple in structure, easy for installation, high frequency response and have the probe-type liquid metal leakage device of automatic cut-out probe electrode.
The present invention is to provide a kind of probe-type and detect the device that liquid metal leaks, it comprises: output probe, output probe fixed fastener, input probe fixed fastener, input probe, connection terminal, checkout equipment, main control board and 24V direct supply.Its relativeness is: the 24V direct supply is connected to main control board, the output port of main control board is connected to connection terminal, output probe and input probe are connected to respectively on the connection terminal, the output probe is fixed on the output probe fixed fastener, the input probe is fixed on the input probe fixed fastener, output probe fixed fastener and input probe fixed fastener are fixed on the tested pipeline, and wherein liquid metal is in pipeline.
Its course of work is: 24V direct supply output 24V direct current is for main control board, the connection terminal of main control board is connected to the output probe, the output probe is an output+24V electrode, at this moment, do not have conducting to form the closed-loop path between output probe and the input probe, when having liquid metal to leak, liquid metal can be flowed through under Action of Gravity Field and be exported probe and input probe, cause output probe and the conducting of input probe, form the closed-loop path.And input probe one end is connected to connection terminal, leakage signal can be transferred to main control board.Main control board record leakage signal is also exported leakage signal to other checkout equipment, simultaneously, main control board can be at the output voltage signal of 10 μ s internal cutting ofves output probe, guarantee that liquid metal or pipeline are in electroless state, thereby can not affect the normal use that other is installed in the sensor on the pipeline.
What need further replenish is: export the probe fixed fastener and input the pipeline that the probe fixed fastener can adapt to the 16mm-120mm caliber, and can be flexible be fixed on the pipeline, easy for installation, be convenient to regulate.
Described main control board can be in without liquid metal leakage situation, give the output probe for the 24V direct current, when having liquid metal to leak conducting output probe and input probe, obtain the metal leakage signal and export this signal to checkout equipment, simultaneously, can be at the voltage signal of 10 μ s internal cutting ofves output probe, thus avoid affecting because liquid metal or pipeline are charged other be installed in pipeline or with the direct contacted working sensor of liquid metal.
In sum, the advantage compared with existing liquid metal leakage device of apparatus of the present invention is:
1), the probe fixed fastener of apparatus of the present invention can use the caliber of pipeline to carry out suitable adjusting according to reality, just can satisfy the fixing demand of probe, thereby guarantee the reliability and stability that probe is fixing, reduced a large amount of artificial peace processes.
2), apparatus of the present invention have the function of automatic cut-out electrode signal, can be in without liquid metal leakage situation, supply the 24V direct current to probe, when having liquid metal to leak two probes of conducting, but device automatic acquisition metal leakage signal is also exported this signal to checkout equipment, simultaneously, can be at the voltage signal of 10 μ s internal cutting off probes, thereby avoid affecting because liquid metal or pipeline are charged other be installed in pipeline or with the direct contacted working sensor of liquid metal, guaranteed the reliability and stability of measuring system.
Description of drawings
Fig. 1 liquid metal leak detecting device pie graph;
Fig. 2 fixed fastener structural representation;
Fig. 3 main control board theory diagram;
Fig. 4 system monitoring sequential schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Fig. 1 represents liquid metal leak detecting device pie graph.It mainly comprises: output probe 1, output probe fixed fastener 2, input probe fixed fastener 3, input probe 4, connection terminal 6, checkout equipment 7, main control board 8 and 24V direct supply 9.Its relativeness is: 24V direct supply 9 is connected to main control board 8, the output port of main control board 8 is connected to connection terminal 6, output probe 1 and input probe 4 are connected to respectively on the connection terminal 6, output probe 1 is fixed on the output probe fixed fastener 2, input probe 4 is fixed on the input probe fixed fastener 3, output probe fixed fastener 2 and input probe fixed fastener 3 are fixed on the tested pipeline 5, and wherein liquid metal is in pipeline 5.
Its concrete implementation process be following some:
1, civil power 220V is converted to the 24V direct supply for whole contrive equipment after 24V direct supply 9AC-DC conversion, and the power of direct supply 9 is 65W, is single output 24V direct current.Direct supply 9 is placed nearby with main control board 8, and between adding isolation and shield device, prevents the normal operation of the electromagnetic interference influence main control board 8 in the AC-DC transfer process.
2, the 24V direct current is after the DC-DC of main control board 8 conversion, and output 5V direct current is for the electronic devices and components work of main control board 8.Output probe 1 is connected on the output wiring terminal 6 of main control board 8, output 24V direct current, and at this moment, output probe 1 is as an electrode.When having liquid metal to leak, just can conducting export probe 1 and input probe 4, this moment, the 24V direct current just inputed to the input wires terminal 6 of main control board through input probe 4, collect corresponding 24V direct current signal by main control board, after this signal is processed, 24V direct current on 10 μ s internal cutting ofves output probe 1, simultaneously, dispensing liquid metal leakage signal is to relevant monitoring equipment 7.
3, need supplementary notes be, the distance between output probe 1 and the input probe 4 is by adjusting in the engineering construction process, its spacing is 2～3mm usually.Output probe 1 and input probe are fixed on the tested pipeline 5 by output probe fastener 2 and input probe fastener 3.
What Fig. 2 represented is the fixed fastener structural representation.Fixed fastener comprises output probe fixed fastener 1 and input probe fixed fastener 4, and its structure is the same.Include: gib screw 2A, fixed dam 2B, V-arrangement pickup groove 2C and gib screw 2D.The top angle of V-arrangement pickup groove 2C is 60 degree, and when the pipeline that is fixed was put into to V-arrangement pickup groove 2C, its external diameter that can put into pipeline just can be extrapolated, and was specific as follows:
1, the outer diameter tube that is fixed of minimum
Fixed dam 2B is to the top distance H 0+H1 of V-arrangement pickup groove 2C, and is fixing when this distance value is structural design, and its value is 412mm.H1 is the ultimate range that gib screw 2A can extend, and is 376mm, gets the pipeline radius according to relevant geometric relationship like this:
Wherein, R1 is the radius of pipeline, H0 be the gib screw top to the distance on V-arrangement pickup groove top, after related data brought into, calculate the outer diameter tube that minimum is fixed and be:
R1＝16mm
2, the outer diameter tube that is fixed of maximum
According to top calculated relationship, can obtain the outer diameter tube R2 that maximum is fixed and be:
Wherein, H3 be the gib screw top to the distance on V-arrangement pickup groove top, its value is for 52mm, the substitution following formula calculates the outer diameter tube that maximum is fixed and is:
R2＝120mm
It is pointed out that after fixed fastener is fixing, also need output probe 2 and input probe 3 are fixed on the corresponding fixed fastener, and suitable adjustment two output probes 2 and the distance between the input probe 3, distance namely can not be too large, also can not be too small.Distance cross conference may conducting when causing liquid metal to leak not two probes, distance can cause pipe vibration when too near and mislead two probes.The mounting distance that the present invention implements is 2～3mm.
What Fig. 3 represented is the main control board theory diagram.It comprises: voltage conversion unit, STC12C5A60S2 single-chip microcomputer, triode converting unit W1 and triode converting unit W2, field effect transistor unit U1 and U2 and photoelectricity isolated location.Its specific implementation process is:
1, after the 24V direct current is changed through voltage conversion unit, be converted to the direct current of 5V, the direct current of 5V is for main control board 8 other component units.Wherein, the voltage transitions chip of voltage conversion unit is LM2596, this chip changing voltage of high support is 37V, the direct current that is converted to 5V that in the present invention can the 24V direct current is steady, simultaneously, this chip has also configured bypass and filter capacitor and inductance, guarantees that the ripple of output voltage is less.
2, main control chip STC12C5A60S2 single-chip microcomputer is through triode converting unit W1 controlling filed effect pipe unit U1, and at this moment, field effect transistor unit U1 is in the saturation conduction state, and its output signal is the 24V direct current, and exports on the output probe 1 through connection terminal 6.When having liquid metal to leak, liquid metal can be flowed through under Action of Gravity Field and be exported probe 1 and input probe 4, thus conducting two probes.At this moment, the 24V dc signal just can transfer to main control board through input probe 4, by the photoelectricity isolated location this signal is isolated, and its input voltage is down to 5V from 24V, thereby input to main control chip STC12C5A60S2 single-chip microcomputer and trigger single-chip microcomputer.After this trigger pip was processed, STC12C5A60S2 can input a low level to triode unit W1, thereby made field effect transistor unit U1 cut-off, and at this moment, the 24V d. c. voltage signal that is added on the input probe 1 just is cut off.On the other hand, can export a high level signal after the STC12C5A60S2 single-chip microcomputer is triggered to triode unit W2, thereby conducting field effect transistor unit U2 finally exports the 24V direct current to monitoring equipment.
3, main control board 8 can continue to keep dispensing liquid metal leakage signal to monitoring equipment, until the liquid metal leakage signal is disengaged or artificial restarts main control board 8.
Fig. 4 represents system monitoring sequential schematic diagram.The related measurement and control signal of liquid metal leakage monitoring system of the present invention comprises: input probe monitor signal, control output probe signals and system's output leakage signal.In implementation process, its concrete sequential relationship is as follows:
1, after output probe 1 and the 4 quilt liquid metal conducting of leaking of input probe, can be from 24V d. c. voltage signal of input probe output, simultaneously, this signal can trigger main control chip STC12C5A60S2 single-chip microcomputer and cut off the 24V d. c. voltage signal that is added on the output probe 1, monitoring the 24V d. c. voltage signal from the input probe is t1 to exporting the time-delay of probe signals between being cut off, and the time of this time-delay is in 1 μ s.Shutoff signal action time is t2, and its duration is about 5 μ s in the present invention.As from the foregoing, monitoring signal from the input probe in whole observation process is cut off duration and is no more than 10 μ s to being added in the signal of output on the probe.
2, meeting dispensing liquid metal leakage signal was to other monitoring equipment after main control chip STC12C5A60S2 was triggered, this process realizes by main control chip I/O pin output signal control triode and field effect transistor unit, monitoring leakage signal to the time-delay between the main control chip output leakage signal from the input probe is t3, in the present invention, its value is about 15 μ s.This signal demand continue to keep a period of time t4, is collected and responds by other monitoring equipment fully guaranteeing.Among the present invention, this retention time is the shortest to be 1s.
Apparatus of the present invention have overcome the shortcoming of conventional probe formula liquid metal Leak Detection, make its scope of application wider, safeguard convenient, and can integrated multiple spot liquid metal leak detecting device.
The part that the present invention does not elaborate belongs to techniques well known.
Although the above is described the illustrative embodiment of the present invention; so that the technician of present technique neck understands the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and the spirit and scope of the present invention determined in, these variations are apparent, all utilize innovation and creation that the present invention conceives all at the row of protection.
Claims (3)
1. probe-type high frequency sound liquid metal leak detecting device, it is characterized in that: this device comprises: output probe (1), output probe fixed fastener (2), input probe fixed fastener (3), input probe (4), connection terminal (6), checkout equipment (7), main control board (8) and 24V direct supply (9); 24V direct supply (9) is connected to main control board (8), the output port of main control board (8) is connected to connection terminal (6), output probe (1) and input probe (4) are connected to respectively on the connection terminal (6), output probe (1) is fixed on the output probe fixed fastener (2), input probe (4) is fixed on the input probe fixed fastener (3), output probe fixed fastener (2) and input probe fixed fastener (3) are fixed on the tested pipeline (5), and wherein liquid metal is in pipeline (5); Its course of work is as follows: 24V direct supply (9) output 24V direct current is for main control board (8), the connection terminal of main control board (6) is connected to output probe (1), output probe (1) is an output+24V electrode, at this moment, there is not conducting to form the closed-loop path between output probe (1) and the input probe (4), when having liquid metal to leak, liquid metal can be flowed through under Action of Gravity Field and be exported probe (1) and input probe (4), cause output probe (1) and the conducting of input probe (4), form the closed-loop path; And input probe (4) one ends are connected to connection terminal (6), leakage signal can be transferred to main control board (8); Main control board (8) record leakage signal is also exported leakage signal to other checkout equipment (7), simultaneously, main control board (8) can be at the output voltage signal of 10 μ s internal cutting ofves output probes (1), guarantee that liquid metal or pipeline are in electroless state, thereby can not affect the normal use that other is installed in the sensor on the pipeline (5).
2. described probe-type high frequency sound liquid metal leak detecting device according to claim 1, it is characterized in that, described output probe fixed fastener (2) can adapt to the fixedly requirement of different pipelines (5) caliber with input probe fixed fastener (3), suitable conduit caliber scope is: 16mm-120mm, it is flexible for installation, is convenient to dismounting and maintenance.
3. described probe-type high frequency sound liquid metal leak detecting device according to claim 1, it is characterized in that, described main control board (8) can be in without liquid metal leakage situation, give output probe (1) for the 24V direct current, when having liquid metal to leak conducting output probe (1) and input probe (4), obtain the metal leakage signal and export this signal to checkout equipment (7), simultaneously, can be at the voltage signal of 10 μ s internal cutting ofves output probes (1), thus avoid affecting because liquid metal or pipeline are charged other be installed in pipeline (5) or with the direct contacted working sensor of liquid metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210591619.5A CN103018780B (en) | 2012-12-31 | 2012-12-31 | A kind of Probe-type high-frequency-respoliquid liquid metal leakage detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210591619.5A CN103018780B (en) | 2012-12-31 | 2012-12-31 | A kind of Probe-type high-frequency-respoliquid liquid metal leakage detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103018780A true CN103018780A (en) | 2013-04-03 |
| CN103018780B CN103018780B (en) | 2015-11-04 |
Family
ID=47967592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210591619.5A Expired - Fee Related CN103018780B (en) | 2012-12-31 | 2012-12-31 | A kind of Probe-type high-frequency-respoliquid liquid metal leakage detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103018780B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644458A (en) * | 2013-11-08 | 2014-03-19 | 上海华力微电子有限公司 | Leaked liquid detection device |
| CN106323564A (en) * | 2016-08-25 | 2017-01-11 | 中国科学院合肥物质科学研究院 | Lead matrix liquid metal leakage detection and locating method |
| CN107741302A (en) * | 2017-08-11 | 2018-02-27 | 昆明品启科技有限公司 | A kind of apparatus and method leaked using Six Degrees vibration detection liquid metal |
| CN107884832A (en) * | 2016-09-29 | 2018-04-06 | 宝钢新日铁汽车板有限公司 | A kind of zinc pot leaks zinc detector |
| CN116928604A (en) * | 2023-07-31 | 2023-10-24 | 浙江昊阔物联科技有限公司 | Automatic water pipe water leakage detection device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6295438A (en) * | 1985-10-23 | 1987-05-01 | Hitachi Ltd | Water leak detector |
| CN1657895A (en) * | 2005-03-17 | 2005-08-24 | 大连理工大学 | On-line monitoring alarm device for leakage of water cooler |
| CN101718608A (en) * | 2009-11-03 | 2010-06-02 | 重庆山外山科技有限公司 | Electromagnetic valve leak detection system for blood purification |
| CN101836060A (en) * | 2007-10-23 | 2010-09-15 | 大金工业株式会社 | Fluid sensor, refrigerant leakage detection device, refrigeration device, and refrigerant leakage detection method |
| CN102290788A (en) * | 2011-08-08 | 2011-12-21 | 深圳市亚特尔科技有限公司 | Measurement protective device of submersible pump motor |
-
2012
- 2012-12-31 CN CN201210591619.5A patent/CN103018780B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6295438A (en) * | 1985-10-23 | 1987-05-01 | Hitachi Ltd | Water leak detector |
| CN1657895A (en) * | 2005-03-17 | 2005-08-24 | 大连理工大学 | On-line monitoring alarm device for leakage of water cooler |
| CN101836060A (en) * | 2007-10-23 | 2010-09-15 | 大金工业株式会社 | Fluid sensor, refrigerant leakage detection device, refrigeration device, and refrigerant leakage detection method |
| CN101718608A (en) * | 2009-11-03 | 2010-06-02 | 重庆山外山科技有限公司 | Electromagnetic valve leak detection system for blood purification |
| CN102290788A (en) * | 2011-08-08 | 2011-12-21 | 深圳市亚特尔科技有限公司 | Measurement protective device of submersible pump motor |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644458A (en) * | 2013-11-08 | 2014-03-19 | 上海华力微电子有限公司 | Leaked liquid detection device |
| CN103644458B (en) * | 2013-11-08 | 2016-01-27 | 上海华力微电子有限公司 | Liquid leakage detection device |
| CN106323564A (en) * | 2016-08-25 | 2017-01-11 | 中国科学院合肥物质科学研究院 | Lead matrix liquid metal leakage detection and locating method |
| CN106323564B (en) * | 2016-08-25 | 2018-09-04 | 中国科学院合肥物质科学研究院 | A kind of matrix of wires liquid metal leak detection and localization method |
| CN107884832A (en) * | 2016-09-29 | 2018-04-06 | 宝钢新日铁汽车板有限公司 | A kind of zinc pot leaks zinc detector |
| CN107741302A (en) * | 2017-08-11 | 2018-02-27 | 昆明品启科技有限公司 | A kind of apparatus and method leaked using Six Degrees vibration detection liquid metal |
| CN116928604A (en) * | 2023-07-31 | 2023-10-24 | 浙江昊阔物联科技有限公司 | Automatic water pipe water leakage detection device |
| CN116928604B (en) * | 2023-07-31 | 2024-01-02 | 浙江昊阔物联科技有限公司 | Automatic water pipe water leakage detection device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103018780B (en) | 2015-11-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103018780B (en) | A kind of Probe-type high-frequency-respoliquid liquid metal leakage detector | |
| GB2472363A (en) | High temperature and pressure oxidation-reduction potential measuring and monitoring device for hot water systems | |
| CN204667117U (en) | A kind of based on the adaptive analog quantity detecting device of general A/D sensing range | |
| CN101975603B (en) | Liquid level detector | |
| CN104267273A (en) | Quick detection circuit and method for mains fluctuation | |
| CN106908750A (en) | A kind of electric energy meter pulse error detection method and device | |
| CN203365603U (en) | Portable direct-current system ground fault locating device | |
| CN203310903U (en) | Transformer iron core earth current online monitor | |
| CN204495940U (en) | Dynamic hit detection instrument | |
| CN102288257A (en) | Device for detecting liquid level by using square signal | |
| CN205120740U (en) | Motor rotational speed comprehensive testing system | |
| CN207502554U (en) | A kind of transient state oil stream velocity measuring device during transformer short-circuit impact | |
| CN103149545A (en) | Testing method, testing device, testing equipment and testing system of very fast transient overvoltage (VFTO) sensor | |
| CN103033386A (en) | Thermostat dynamic lift testing device and testing method | |
| CN205679340U (en) | Transformer temperature loop fault detector | |
| CN206420432U (en) | A kind of nondestructive testing instrument of the protective layer thickness based on C8051 single-chip microcomputers | |
| CN204302353U (en) | A kind of power detection system based on Hall element | |
| CN104407017B (en) | Portable soil pollutant monitoring device | |
| CN103728527A (en) | System for monitoring fault of loop on multi-bus section of direct current system | |
| CN104135405B (en) | A kind of special communication module method of testing of special change III of automatic calibration system | |
| CN105785109A (en) | Integrated device for current measurement, acquisition and energy obtaining for parallelly connected capacitors | |
| CN203984098U (en) | A kind of device for quick testing of powerline network | |
| CN103033702B (en) | Multifunctional hand-held lightning arrester tester | |
| CN202956357U (en) | Device for detecting moisture content of grains on line | |
| CN202974355U (en) | Ultrasonic flow measurement device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151104 Termination date: 20171231 |