CN101261169A - Crossbeam type oil pumping machine feed sensor calibration system and its calibration method - Google Patents
Crossbeam type oil pumping machine feed sensor calibration system and its calibration method Download PDFInfo
- Publication number
- CN101261169A CN101261169A CNA2008100158109A CN200810015810A CN101261169A CN 101261169 A CN101261169 A CN 101261169A CN A2008100158109 A CNA2008100158109 A CN A2008100158109A CN 200810015810 A CN200810015810 A CN 200810015810A CN 101261169 A CN101261169 A CN 101261169A
- Authority
- CN
- China
- Prior art keywords
- load sensor
- circuit
- output
- crossbeam
- sensor
- 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
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a crossbeam-typed oil pumping machine load sensor calibration system and a calibration method. Aiming at solving the problems that the existing oil filed pumping machine indicator diagram measurement system is affected by the operation and the measurement precision of the load sensor is poor, the crossbeam-typed oil pumping machine load sensor calibration system and the calibration method are provided so as to achieve the goal of long-term stable operation of the load sensor. The structure of the crossbeam-typed oil pumping machine load sensor comprises a load sensor, calibration equipment, a standard load sensor and data collecting equipment; wherein, the load sensor is arranged on the oil pumping machine crossbeam and is connected with the calibration equipment by cables; the calibration equipment is arranged just above the swing fulcrum of the oil pumping machine crossbeam and is connected with the data collecting equipment by the cables; the standard load sensor is arranged on a polished rod of the oil pumping machine horsehead and is connected with the data collecting equipment by the cables.
Description
Technical field
The present invention relates to the measuring system of means for oilfield oil pump indicating diagram, relate to a kind of crossbeam type oil pumping machine feed sensor calibration system and scaling method thereof by it.
Background technology
Calculate and draw means for oilfield oil pump indicating diagram and need measure the shift value of oil-extractor polish-rod and the load value of each shift value correspondence.At present, crossbeam type oil pumping machine feed is measured, and directly measures the pulling force of polished rod, and this measuring method is accurate.But, because the frequent operation of oil well (maintenance, down together), will remove polished rod in the process of operation, the operating personnel can not cause often damaging in the process of operation on the one hand it as a meticulous equipment, after each on the other hand end of job, because the technician is absent from the scene, can not in time recover, this has become the obstruction of oil well TT﹠C system operation steady in a long-term.In recent years, people measure load by the deformation of oil pumper crossbeam, but solve the consistance of installation and the accuracy of data all the time, and this mode can not actually be used.The present invention adopts technology and software algorithms such as computing machine, A/D, D/A, the establishing criteria load sensor is demarcated the beam load sensor, solved inconvenience and the inaccurate problem of data have been installed, realized on crossbeam, installing load sensor and carried out the target that load-position diagram is measured.
Summary of the invention
The present invention is directed to existing means for oilfield oil pump indicating diagram measuring system is subjected to operation to influence problem with cross beam type load sensor measuring accuracy difference, provide a kind of crossbeam type oil pumping machine feed sensor calibration system and scaling method thereof, to realize the target of load sensor operation steady in a long-term.
For achieving the above object, the present invention adopts following technical scheme:
A kind of crossbeam type oil pumping machine feed sensor calibration system, it comprises cross beam type load sensor, calibration facility, scale load sensor and data acquisition equipment, wherein the cross beam type load sensor is installed on the oil pumper crossbeam, and it is connected with calibration facility by cable; Calibration facility is installed in directly over the swing fulcrum of oil pumper crossbeam, and it is connected with data acquisition equipment by cable; The scale load sensor is installed on the polished rod of pumping unit horsehead, and it is connected with data acquisition equipment by cable.
The position that described load sensor is installed can be below oil pumper crossbeam front end be the horse head end the side or above; Also can be installed in oil pumper crossbeam rear end following or side or above.
Described load sensor is connected with load sensor by 4 core cables; Calibration facility is connected with data acquisition equipment by 5 core cables; The scale load sensor is connected with data acquisition equipment by 2 core cables.
Described calibration facility comprises the processing of scale load sensor and Acquisition Circuit, the processing of measurement load sensor and Acquisition Circuit, angular displacement processing and Acquisition Circuit, they all are connected with the CPU input end, the CPU output terminal is connected with output circuit with output circuit and displacement transducer conversion with the load sensor conversion respectively, simultaneously CPU also with 485 interface circuit two-way communications.
Described scale load sensor is handled with Acquisition Circuit and is comprised voltage/circuit conversion of being connected successively and holding circuit, low-pass filter, A/D converter; wherein voltage/circuit conversion is connected with the scale load sensor with the holding circuit input end, and the A/D converter output terminal then is connected with the CPU input end.
Described measurement load sensor is handled and is comprised analog adder, amplifying circuit, low-pass filter, the A/D converter that is connected successively with Acquisition Circuit, and wherein input amplifier is connected with load sensor, and the A/D converter output terminal is connected with the CPU input end.
The angular displacement processing comprises angular displacement sensor angle/voltage conversion circuit, low-pass filter and the A/D converter that is connected successively with Acquisition Circuit, and wherein the A/D converter output terminal is connected with the input end of CPU.
Described load sensor conversion and output circuit comprise D/A converter, it comprises one tunnel D/A converter that connects successively and voltage/current translation circuit, wherein the input end of D/A converter is connected with the output terminal of CPU, the load output of voltage/current translation circuit output 4-20mA;
Described displacement transducer conversion comprises D/A converter, the voltage/current translation circuit that another road is connected successively with output circuit, wherein the displacement output of voltage/current translation circuit output 4-20mA.
A kind of scaling method of crossbeam type oil pumping machine feed sensor fixed system, its step be,
A. timing signal is installed the accurate load sensor of a station symbol on oil-extractor polish-rod, and its form that is output as 4-20mA inserts the scale load input end of data acquisition equipment;
B. in the calibration facility, signal output part at cross beam type load sensor electric bridge, add a 300mV positive voltage with analog adder, then through sending into the A/D change-over circuit after amplification, the filtering, it can be in the one-period at a stroke of oil pumper, forms the digital signal input CPU of a variation;
C. the scale load sensor signal enters A/D converter after filtering after the current-voltage conversion, also exports the digital signal that changes in the stroke and enters CPU;
D.CPU sets up the corresponding relation of accurate load sensor and cross beam type load sensor in 1-2 stroke, method is: two load sensors are according to accuracy requirement, in a stroke, respectively gather 128 or 256 or more data, and in plane coordinates, form a curve, store in the EEPROM, this has just finished demarcation; After the scale load sensor is removed, be considered as between linear zone between CPU 2 that formation curve is adjacent, the cross beam type load sensor whenever collects data, fall on the original collection point, fall in 127 or 255 intervals, then, calculate actual load value on the current polished rod with linear gauge, and by D/A change-over circuit and voltage-to-current translation circuit, the current value of output correspondence is to data acquisition equipment;
E. the while is carried out synchronous A/D conversion, CPU processing and D/A conversion with the data of angular displacement sensor in calibration facility, makes calibrated load sensor output synchronous in time with angular displacement sensor output, and realization is demarcation accurately.Measuring load sensor among the present invention is installed on the oil pumper crossbeam, calibration facility is installed in directly over the swing fulcrum of oil pumper crossbeam, the scale load sensor is installed on the polished rod of horse head, calibration process is realized automatically by CPU, after demarcating end, the measurement of load is finished by the load sensor on the crossbeam, and its precision is consistent with the scale load sensor.Angular displacement sensor and treatment circuit are arranged in the calibration facility; Conversion of scale load sensor and treatment circuit; Measure load sensor and amplify and treatment circuit, add the 300mV offset voltage with analog adder, guarantee the linearity at the electric bridge output circuit of measuring load sensor; 3 road A/D change-over circuits are arranged, 2 road D/A change-over circuits; CPU is arranged; 485 interface circuits.The load sensor data and the angular displacement sensor that output to data acquisition equipment for assurance are synchronous, and load and angular displacement sensor are all handled and the D/A transfer process through A/D conversion, CPU.Load sensor and angular displacement sensor output signal also can be transferred to data acquisition equipment by 485 interface circuits.
The invention has the beneficial effects as follows: simple in structure, easy to use, need not remove load sensor during operation, more can not damage load sensor, only moved the oil pumper crossbeam and just need demarcate again once with the scale load sensor when operation, this situation just took place once in common about 5 years.Therefore, can realize the target of load sensor operation steady in a long-term.
Description of drawings
Fig. 1 is a mounting structure synoptic diagram of the present invention;
Fig. 2 is the calibration facility structured flowchart.
Wherein, 1. calibration facility, 101. voltage/current conversion and holding circuits; 102. low-pass filter, 103.A/D converter, 104. amplifying circuits; 105. angular displacement sensor, 106. angles/voltage conversion circuit, 107.CPU; 108.485 interface circuit, 109.D/A converter, 110. voltage/current translation circuits; 111. analog adder; 2. load sensor, 3. data acquisition equipment, 4. scale load sensor.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Among Fig. 1, a cross beam type load sensor 2 is installed on the oil pumper crossbeam, the position of installing can be below oil pumper crossbeam front end (horse head end), the side and above, or rear end (gear-box end) below, the side and above, one cover calibration facility 1 is installed directly over the swing fulcrum of oil pumper crossbeam, its block scheme as shown in Figure 2, calibration facility 1 comprises processing of scale load sensor and Acquisition Circuit, measuring load sensor handles and Acquisition Circuit, angular displacement processing and Acquisition Circuit, they are connected with the CPU107 input end, the CPU107 output terminal is connected with output circuit with output circuit and displacement transducer conversion with the load sensor conversion respectively, simultaneously CPU107 also with 108 two-way communications of 485 interface circuits.Cross beam type load sensor 2 models are BR-8; Scale load sensor 4 models are BR-2; Data acquisition equipment 3 models are GN500.
Described scale load sensor is handled with Acquisition Circuit and is comprised voltage/circuit conversion of being connected successively and holding circuit 101, low-pass filter 102, A/D converter 103; wherein voltage/circuit conversion is connected with scale load sensor 4 with holding circuit 101 input ends, and A/D converter 103 output terminals then are connected with the CPU107 input end.
Described measurement load sensor is handled and is comprised analog adder 111, amplifying circuit 104, low-pass filter 102, the A/D converter 103 that is connected successively with Acquisition Circuit, wherein amplifying circuit 104 input ends are connected with load sensor 2, and A/D converter 103 output terminals are connected with the CPU107 input end.
Described angular displacement processing comprises angular displacement sensor 105, angle/voltage conversion circuit 106, low-pass filter 102 and the A/D converter 103 that is connected successively with Acquisition Circuit, and wherein A/D converter 103 output terminals are connected with the input end of CPU107.
Described load sensor conversion comprises one tunnel D/A converter that is connected successively 109 and voltage/current translation circuit 110 with output circuit, wherein the input end of D/A converter 109 is connected with the output terminal of CPU107, the load output of voltage/current translation circuit 110 output 4-20mA;
Described displacement transducer conversion comprises D/A converter 109, the voltage/current translation circuit 110 that another road is connected successively with output circuit, wherein the displacement output of voltage/current translation circuit 110 output 4-20mA.
485 interface circuits 108 are used for load and displacement are exported to the data acquisition equipment of 485 interfaces simultaneously.
Calibration facility 1 inserts data acquisition equipment 3,5 core cables by one 5 core cable and is respectively+24V,, load output and displacement output (this two core also can the output of 485 forms), scale load input;
One 4 core cable of calibration facility 1 usefulness is connected with load sensor 2; One 2 core cable of data acquisition equipment 3 usefulness is connected with scale load sensor 4.
Scaling method of the present invention is:
Timing signal is installed an open type scale load sensor on polished rod, its form that is output as 4-20mA inserts the scale load input end of data acquisition equipment.In the calibration facility, at the signal output part of measuring the load sensor electric bridge, add a positive voltage (300mV with the analog addition circuit, in order to avoid not exporting negative voltage at that time, the installation of measurement load sensor do not destroy linearity), then through sending into the A/D change-over circuit after amplification, the filtering, it can form the digital signal input CPU of a variation in a stroke (one-period) of oil pumper; The scale load sensor also can be after the current-voltage conversion, after filtering, enter A/D converter, also can export the digital signal that changes in the stroke and enter CPU, CPU will set up both corresponding relations rapidly in 1-2 stroke, method for building up is as follows: two load sensors are according to accuracy requirement, can in a stroke, respectively gather 128 or 256 or more data, and in plane coordinates, form a curve, store in the EEPROM, this has just finished demarcation, after the scale load sensor is removed, be considered as between linear zone between CPU 2 that formation curve is adjacent, the cross beam type load sensor whenever collects data, or falls on the original collection point, or falls in 127 or 255 intervals, then, calculate actual load value on the current polished rod with linear gauge, and by D/A change-over circuit and voltage-to-current translation circuit, the corresponding current value of output is to data acquisition equipment.After demarcating, under the situation of not dismounting of oil pumper crossbeam, the value that calibration facility is measured according to the beam load sensor, the corresponding current value of output actual load.
Because A/D conversion, CPU handle and the D/A conversion all needs the time, just poor if having time if angular displacement sensor is not correspondingly processed with load sensor output, make the load-position diagram distortion of making.Therefore, in calibration facility, the data of angular displacement sensor are carried out synchronous A/D conversion, CPU processing and D/A conversion, make calibrated load sensor output synchronous in time, realize accurately demarcation with angular displacement sensor output.
The present invention not detailed description is known technology, repeats no more.
Claims (9)
1. crossbeam type oil pumping machine feed sensor calibration system, it is characterized in that: it comprises cross beam type load sensor, calibration facility, scale load sensor and data acquisition equipment, wherein the cross beam type load sensor is installed on the oil pumper crossbeam, and it is connected with calibration facility by cable; Calibration facility is installed in directly over the swing fulcrum of oil pumper crossbeam, and it is connected with data acquisition equipment by cable; The scale load sensor is installed on the polished rod of pumping unit horsehead, and it is connected with data acquisition equipment by cable.
2. crossbeam type oil pumping machine feed sensor calibration system according to claim 1 is characterized in that: the position that described load sensor is installed can be below oil pumper crossbeam front end be the horse head end the side or above; Also can be installed in oil pumper crossbeam rear end following or side or above.
3. crossbeam type oil pumping machine feed sensor calibration system according to claim 1 is characterized in that: described load sensor is connected with load sensor by 4 core cables; Calibration facility is connected with data acquisition equipment by 5 core cables; The scale load sensor is connected with data acquisition equipment by 2 core cables.
4. crossbeam type oil pumping machine feed sensor calibration system according to claim 1, it is characterized in that: described calibration facility comprises the processing of scale load sensor and Acquisition Circuit, the processing of measurement load sensor and Acquisition Circuit, angular displacement processing and Acquisition Circuit, they all are connected with the CPU input end, the CPU output terminal is connected with output circuit with output circuit and displacement transducer conversion with the load sensor conversion respectively, simultaneously CPU also with 485 interface circuit two-way communications.
5. crossbeam type oil pumping machine feed sensor calibration system according to claim 4; it is characterized in that: described scale load sensor is handled with Acquisition Circuit and is comprised voltage/circuit conversion of being connected successively and holding circuit, low-pass filter, A/D converter; wherein voltage/circuit conversion is connected with the scale load sensor with the holding circuit input end, and the A/D converter output terminal then is connected with the CPU input end.
6. crossbeam type oil pumping machine feed sensor calibration system according to claim 4, it is characterized in that: described measurement load sensor is handled and is comprised analog adder, amplifying circuit, low-pass filter, the A/D converter that is connected successively with Acquisition Circuit, wherein input amplifier is connected with load sensor, and the A/D converter output terminal is connected with the CPU input end.
7. crossbeam type oil pumping machine feed sensor calibration system according to claim 4, it is characterized in that: the angular displacement processing comprises angular displacement sensor angle/voltage conversion circuit, low-pass filter and the A/D converter that is connected successively with Acquisition Circuit, and wherein the A/D converter output terminal is connected with the input end of CPU.
8. crossbeam type oil pumping machine feed sensor calibration system according to claim 4, it is characterized in that: described load sensor conversion and output circuit comprise D/A converter, it comprises one tunnel D/A converter that connects successively and voltage/current translation circuit, wherein the input end of D/A converter is connected with the output terminal of CPU, the load output of voltage/current translation circuit output 4-20mA;
Described displacement transducer conversion comprises D/A converter, the voltage/current translation circuit that another road is connected successively with output circuit, wherein the displacement output of voltage/current translation circuit output 4-20mA.
9. scaling method that adopts the described crossbeam type oil pumping machine feed sensor fixed system of claim 1 is characterized in that: its step is,
A. timing signal is installed the accurate load sensor of a station symbol on oil-extractor polish-rod, and its form that is output as 4-20mA inserts the scale load input end of data acquisition equipment;
B. in the calibration facility, signal output part at cross beam type load sensor electric bridge, add a 300mV positive voltage with analog adder, then through sending into the A/D change-over circuit after amplification, the filtering, it can be in the one-period at a stroke of oil pumper, forms the digital signal input CPU of a variation;
C. the scale load sensor signal enters A/D converter after filtering after the current-voltage conversion, also exports the digital signal that changes in the stroke and enters CPU;
D.CPU sets up the corresponding relation of accurate load sensor and cross beam type load sensor in 1-2 stroke, method is: two load sensors are according to accuracy requirement, in a stroke, respectively gather 128 or 256 or more data, and in plane coordinates, form a curve, store in the EEPROM, this has just finished demarcation; After the scale load sensor is removed, be considered as between linear zone between CPU 2 that formation curve is adjacent, the cross beam type load sensor whenever collects data, fall on the original collection point, fall in 127 or 255 intervals, then, calculate actual load value on the current polished rod with linear gauge, and by D/A change-over circuit and voltage-to-current translation circuit, the current value of output correspondence is to data acquisition equipment;
E. the while is carried out synchronous A/D conversion, CPU processing and D/A conversion with the data of angular displacement sensor in calibration facility, makes calibrated load sensor output synchronous in time with angular displacement sensor output, and realization is demarcation accurately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100158109A CN100573076C (en) | 2008-04-21 | 2008-04-21 | A kind of crossbeam type oil pumping machine feed sensor calibration system and scaling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100158109A CN100573076C (en) | 2008-04-21 | 2008-04-21 | A kind of crossbeam type oil pumping machine feed sensor calibration system and scaling method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101261169A true CN101261169A (en) | 2008-09-10 |
| CN100573076C CN100573076C (en) | 2009-12-23 |
Family
ID=39961767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2008100158109A Expired - Fee Related CN100573076C (en) | 2008-04-21 | 2008-04-21 | A kind of crossbeam type oil pumping machine feed sensor calibration system and scaling method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100573076C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102455238A (en) * | 2011-10-14 | 2012-05-16 | 贵州航天凯山石油仪器有限公司 | Online calibration method of indicator diagram test equipment and connection structure thereof |
| CN103344221A (en) * | 2013-07-19 | 2013-10-09 | 江西飞尚科技有限公司 | Cassette-inclinometer-based monitoring method of equilibrium state of pumping unit |
| CN106052836A (en) * | 2016-08-22 | 2016-10-26 | 蚌埠日月仪器研究所有限公司 | Method for carrying out online calibration on load sensor on oil pumping machine |
| CN107575211A (en) * | 2017-09-11 | 2018-01-12 | 北京安控科技股份有限公司 | A kind of online calibration method of pump unit dynamometer |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4973226A (en) * | 1987-04-29 | 1990-11-27 | Delta-X Corporation | Method and apparatus for controlling a well pumping unit |
| US5064349A (en) * | 1990-02-22 | 1991-11-12 | Barton Industries, Inc. | Method of monitoring and controlling a pumped well |
| US5182946A (en) * | 1991-11-08 | 1993-02-02 | Amerada Hess Corporation | Portable well analyzer |
| US5251696A (en) * | 1992-04-06 | 1993-10-12 | Boone James R | Method and apparatus for variable speed control of oil well pumping units |
| US5252031A (en) * | 1992-04-21 | 1993-10-12 | Gibbs Sam G | Monitoring and pump-off control with downhole pump cards |
| CN2368029Y (en) * | 1997-11-05 | 2000-03-08 | 泰和电气(襄樊)有限公司 | Ergogram test device for permanent set oil-pump for oil field |
| CN101038218A (en) * | 2006-03-17 | 2007-09-19 | 许楠 | Small cantilever beam type walking beam micro-deformation measuring device |
| CN201184835Y (en) * | 2008-04-21 | 2009-01-21 | 济南新吉纳远程测控有限公司 | Calibration system for load sensor of crossbeam type oil pumping machine |
-
2008
- 2008-04-21 CN CNB2008100158109A patent/CN100573076C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102455238A (en) * | 2011-10-14 | 2012-05-16 | 贵州航天凯山石油仪器有限公司 | Online calibration method of indicator diagram test equipment and connection structure thereof |
| CN103344221A (en) * | 2013-07-19 | 2013-10-09 | 江西飞尚科技有限公司 | Cassette-inclinometer-based monitoring method of equilibrium state of pumping unit |
| CN103344221B (en) * | 2013-07-19 | 2015-03-25 | 江西飞尚科技有限公司 | Cassette-inclinometer-based monitoring method of equilibrium state of pumping unit |
| CN106052836A (en) * | 2016-08-22 | 2016-10-26 | 蚌埠日月仪器研究所有限公司 | Method for carrying out online calibration on load sensor on oil pumping machine |
| CN107575211A (en) * | 2017-09-11 | 2018-01-12 | 北京安控科技股份有限公司 | A kind of online calibration method of pump unit dynamometer |
| CN107575211B (en) * | 2017-09-11 | 2020-05-05 | 北京安控科技股份有限公司 | Online calibration method of pumping unit indicator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100573076C (en) | 2009-12-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100573076C (en) | A kind of crossbeam type oil pumping machine feed sensor calibration system and scaling method thereof | |
| CN201184835Y (en) | Calibration system for load sensor of crossbeam type oil pumping machine | |
| CN102410824B (en) | Device and method for detecting thickness of steel plate | |
| CN103712669A (en) | Flow gauge online calibration device | |
| CN108151721B (en) | Ship lock deformation automatic monitoring system based on water level working condition identification and measuring and weather correcting method thereof | |
| CN101029639A (en) | Method for measuring pumping-unit workdone graphic in oil field | |
| CN115378305A (en) | Permanent magnet synchronous linear motor control method and control system | |
| CN103353356A (en) | Highly-precise temperature-measuring method and system employing same | |
| CN205958171U (en) | Pressure transmitter with current -limiting protection | |
| CN103424082B (en) | A kind of contactless reinforcing bar deformation measuring device and measuring method | |
| CN103438960A (en) | Differential pressure type high sensitivity liquid level flow measuring device | |
| CN108919063B (en) | Electric field telemetry system and method based on capacitance correction principle | |
| CN111457834A (en) | Photovoltaic support deformation detection device | |
| CN102455238A (en) | Online calibration method of indicator diagram test equipment and connection structure thereof | |
| CN105090084A (en) | Draught fan online monitoring system and method | |
| CN104932037A (en) | Rainfall sensor | |
| CN105203079A (en) | Settlement monitoring system based on piezoresistive level gauge and control method of settlement monitoring system | |
| CN204758095U (en) | Coil of strip automatic measurement device | |
| CN103266880B (en) | A kind of oil well load measurement method | |
| CN204855057U (en) | Distribution network overhauls electric machine hand torque testing device | |
| CN201110893Y (en) | High voltage potential transformer secondary circuit pressure-drop electric energy metering error real time monitoring device | |
| CN110793712A (en) | Union type pressure sensor high-frequency sampling device | |
| CN205861274U (en) | A kind of OG converter cleaning system differential pressure measuring installation | |
| CN107870140B (en) | Device and method for calculating concentration of magnetic suspension in round steel magnetic powder flaw detection | |
| CN205958172U (en) | Wireless pressure transmitter of high accuracy |
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 | ||
| C56 | Change in the name or address of the patentee |
Owner name: JINAN NEW GIGANANO LONG-DISTANCE MEASURING + CONTR Free format text: FORMER NAME: XINJINA LONG-RANGE SURVEY + CONTROL CO., LTD., JINAN |
|
| CP03 | Change of name, title or address |
Address after: 250101 Shandong city of Ji'nan province high tech Zone Shun Road No. 2000 Shun Tai Plaza Building 8, room 1-805 Patentee after: JINAN NEW GIGANANO LONG-DISTANCE MEASURING & CONTROL Co.,Ltd. Address before: Room A507 No. 750 University Science and Technology Park Xinyu Road, Ji'nan hi tech Development Zone of Shandong province 250101 Patentee before: Jinan Xinjina Long Distance Measuring And Control Co.,Ltd. |
|
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 250101 Shandong city of Ji'nan province high tech Zone Shun Road No. 2000 Shun Tai Plaza 8 Building 8 floor Patentee after: JINAN NEW GIGANANO LONG-DISTANCE MEASURING & CONTROL Co.,Ltd. Address before: 250101 Shandong city of Ji'nan province high tech Zone Shun Road No. 2000 Shun Tai Plaza Building 8, room 1-805 Patentee before: JINAN NEW GIGANANO LONG-DISTANCE MEASURING & CONTROL Co.,Ltd. |
|
| 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: 20091223 |