CN202372426U - Underground fluid density measuring device - Google Patents
Underground fluid density measuring device Download PDFInfo
- Publication number
- CN202372426U CN202372426U CN2011205426106U CN201120542610U CN202372426U CN 202372426 U CN202372426 U CN 202372426U CN 2011205426106 U CN2011205426106 U CN 2011205426106U CN 201120542610 U CN201120542610 U CN 201120542610U CN 202372426 U CN202372426 U CN 202372426U
- Authority
- CN
- China
- Prior art keywords
- mercury
- inductor
- electrode
- slug
- shaped
- 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.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model discloses an underground fluid density measuring device. Left and right mercury columns of a U-shaped mercury groove in the measuring device are respectively connected with an upper pressure sensor and a lower pressure sensor through an upper pressure sensor pressure delivery conduit, a lower pressure sensor pressure delivery conduit and a lower pressure sensor pressure delivery conduit; and the pressure sensor pressure delivery conduit is internally filled with a pressure delivery medium; and the outer walls of the left and the right mercury columns are respectively provided with a capacitance electrode or a resistance electrode. An electrode for connecting the mercury is arranged at the lower part of the U-shaped mercury groove; and a valve for switching on or off the mercury columns at the two sides is arranged at the inner bottom part of the U-shaped mercury groove. The measuring device, disclosed by the utility model, has the advantages of being high in safety, not easy to damage and good for improving reliability and working service life.
Description
Technical field
The utility model belongs to well measurement device technique field, is specifically related to a kind of downhole fluid density measuring equipment.The utility model can be used for the measurement of oil gas in-hole fluid density, mainly is adapted to perpendicular hole and inclined shaft.
Background technology
Radioactive density meter is mainly used in the measurement of present domestic oil gas well density.This densitometer has brought extra security protection problem because
radiographic source will be set in instrument.Market presses for the measurement that the method that adopts other realizes fluid density.
The differential fluid density meter of FDD003 shape that U.S. SONDEX company produces, have following characteristics: the elastic film differential pressure pick-up of a precision has been adopted in its inside.The deflection of film is decided by the pressure difference of both sides.The film both sides are provided with two capacitance electrodes, measure the deflection of diaphragm with capacitance method.Because the absolute pressure of underground survey point can reach 100MPa, and the pressure reduction of fluid density generation is all less than 0.01MPa, and absolute pressure exceeds measured value more than 10,000 times.In order to prevent the pressure reduction off-rating, the request for utilization of whole instrument is very numerous and diverse, and in use damages its accurate differential pressure pickup easily.
Summary of the invention
The technical matters that the utility model will solve provides a kind of downhole fluid density measuring equipment.The principle of the utility model is that the pressure differential and the tested pressure difference that utilize U-shaped mercury cell both sides mercury pressure difference to produce balance each other, and the principle of surveying human blood-pressure with mercurial sphygmomanometer is similar.
The downhole fluid density measuring equipment of the utility model is characterized in, described measurement mechanism comprises mercury cell assembly, pressure transmission conduit, inductor; Described mercury cell assembly contains U-shaped mercury cell I, electrode, in U-shaped mercury cell I, is marked with mercury; The left side mercury slug I pipe of U-shaped mercury cell I is connected with last inductor through last inductor pressure transmission conduit I; U-shaped mercury cell I right side mercury slug I pipe passes through down, and inductor pressure transmission conduit is connected with following inductor; In last inductor pressure transmission conduit, be filled with pressure transmitting medium I; Be filled with pressure transmitting medium II in the inductor pressure transmission conduit down, on the outer wall of left side mercury slug I and right side mercury slug I, be respectively arranged with inductor lateral capacitance electrode and following inductor lateral capacitance electrode; Be provided with the electrode I that connects mercury in the bottom of U-shaped mercury cell I, the bottom in the U-shaped mercury cell I also is provided with both sides mercury slug on-off valve I; The electrode I of last inductor lateral capacitance electrode, following inductor lateral capacitance electrode, connection mercury is connected with electric capacity difference change-over circuit respectively; Electric capacity difference change-over circuit is connected with transmission circuit, downhole transmitted cable, ground recording unit with digitizing successively.
It is described that upward inductor lateral capacitance electrode is identical with the length of following inductor lateral capacitance electrode.
Described pressure transmitting medium I and pressure transmitting medium II adopt insulating oil.
The left side mercury slug I tube wall of described U-shaped mercury cell I and right side mercury slug tube wall adopt insulating material to process, and the internal diameter of mercury column jecket is 3mm～6mm, and the wall thickness of mercury column jecket is 1mm～3mm.
The described length that goes up inductor lateral capacitance electrode and following inductor lateral capacitance electrode is 5cm～10cm.
The second kind of structure and the above-mentioned measurement mechanism of a kind of downhole fluid density measuring equipment of the utility model are basic identical; Difference is; The described inductor lateral capacitance electrode of going up replaces with inductor side resistance electrode and following inductor side resistance electrode respectively with following inductor lateral capacitance electrode; Be respectively arranged with inductor side resistance electrode and following inductor side resistance electrode on the top of the left side of U-shaped mercury cell II mercury slug II and right side mercury slug II, last inductor side resistance electrode contacts with pressure transmitting medium III, pressure transmitting medium IV respectively with following inductor side resistance electrode.Described pressure transmitting medium III, pressure transmitting medium IV adopt conducting electrolyte solution respectively.The left side mercury slug II of described U-shaped mercury cell II and the tube wall of right side mercury slug II all adopt insulating material to process, and its internal diameter is 3mm～6mm.The utility model will be provided with a bath resistance rate measurement column as the temperature effect correction again in second structure.
The downhole fluid density measuring equipment that the utility model proposes has the following advantages: 1. compare with radioactive density meter, can save the radioactive source in the instrument, reduced the difficulty of equipment placement and transportation, improved security.2. compare with the differential fluid density meter that external (U.S. FDD003 of SONDEX company shape) adopts and have following characteristics: the 1. sensor of deformation of thin membrane principle; The maximum differential pressure value of measuring because of the working pressure value ratio of down-hole exceeds more than 10,000 times, so the film of sensor is fragile.And the deformation element of mercury column pressure force balance type sensor is a mercury.It is not fragile, helps improving its reliability and mission life.2. column pressure balanced type sensor is compared with the external accurate elastic film sensor that adopts, and manufacture process requirement is lower, is easy to produce and popularizing action.
Description of drawings
Fig. 1 is the schematic diagram of the downhole fluid density measuring equipment of the utility model.
Fig. 2 is the diagrammatic cross-section of downhole fluid density measuring equipment first embodiment of the utility model.
Fig. 3 is the metering circuit block diagram of downhole fluid density measuring equipment first embodiment of the utility model.
Fig. 4 is the diagrammatic cross-section of second embodiment of the utility model.
Fig. 5 is the section of structure of bath resistance rate measurement column among second embodiment of the utility model.
Among the figure, 1. go up on the inductor 2. on electrode I 14. both sides mercury slug on-off valve I 18. left side mercury slug II 19. right side mercury slug II 21. electric capacity difference change-over circuits 22. digitizings that 12. times inductor lateral capacitances of inductor lateral capacitance electrode electrode 13. on 5. times inductor pressure transmissions of 4. times inductors of inductor pressure transmission conduit 3. pressure transmitting medium I conduit, 6. pressure transmitting medium II, 8. left side mercury slug I, the 9. right side mercury slug I 11. connects mercurys and the transmission circuit 23. downhole transmitted cables 24. ground recording units 31. 32. times inductor side resistances of inductor side resistance electrode electrode, 33. bath resistance rates and measure the electrode II 44 both sides mercury slug on-off valve II 15.U shape mercury cell I 16. U-shaped mercury cell II that top electrode 34. bath resistance rate measurement columns 35. bath resistance rates measurement bottom electrode 36. pressure transmitting medium IV 37. pressure transmitting medium III 43. are connected mercury.
Embodiment
According to accompanying drawing invention is done below and described in further detail.
Fig. 1 is the schematic diagram of the downhole fluid density measuring equipment of the utility model.Among Fig. 1; The principle of work of the downhole fluid density measuring equipment of the utility model is; The last inductor 1 of mercury absolute pressure balance sensor part is sent to U-shaped mercury cell left side mercury slug I 8 upper surfaces in the mercury cell assembly of below through last inductor pressure transmission conduit 2 and last inductor pressure transmitting medium I 3 with pressure.Following inductor 4 is through right side mercury slug I 9 upper surfaces of the U-shaped mercury cell in the mercury cell assembly below inductor pressure transmission conduit 5 is sent to pressure with following inductor pressure transmitting medium II 6 down.Pressure reduction between two pressure-sensitive mouths changes the respective change that will cause U-shaped mercury cell both sides mercury pressure.Measure the difference in height of both sides mercury slug, just can directly calculate the pressure difference between the pressure taps of both sides.When instrument is in vertical position, seen following formula from U-shaped mercury cell internal pressure balance:
In the formula:
P: the pressure differential of two pressure-sensitive mouths up and down.
ρ (Jie): the density of both sides pressure transmitting medium.
ρ (mercury): the density of mercury.
G: acceleration of gravity
Because the pressure difference between upper and lower inductor is produced under action of gravity by in-hole fluid density, and following balanced type is arranged:
ρ in the formula (fluid) is a detected fluid density in the well.
By 1., 2. two formulas solve:
In a surveying instrument; ρ (Jie), ρ (mercury),
H are known; Measure the discrepancy in elevation
h of mercury slug, just can obtain the density of in-hole fluid.
Among Fig. 1, the function of two inductors is that pressure with in-hole fluid is directly delivered on the inner pressure transmitting medium of inductor up and down, and the inductor shell is made up of rubber film or plastic sheeting, and film thickness is between 0.05 to 0.2 millimeter.Require the deflection big (greater than 1 cubic centimetre) of inductor volume, and inside and outside differential pressure as far as possible little (less than 0.0001MPa).Two inductors directly contact through the perforate of tool housing and the in-hole fluid of outside; The sensitivity of the mounting distance of upper and lower two inductors
H and density measure is relevant, generally elects 0.3 to 1 meter as.The selection of pressure transmission tube material is relevant with being provided with of measurement mechanism, also can use metal catheter, and resistance measurement should be adopted insulated conduit.The selection of pressure transmitting medium is also relevant with being provided with of measurement mechanism.
Embodiment 1
Fig. 2 is the diagrammatic cross-section of downhole fluid density measuring equipment first embodiment of the utility model.Fig. 3 is the metering circuit block diagram of the downhole fluid density measuring equipment of the utility model.In Fig. 2, Fig. 3, a kind of downhole fluid density measuring equipment of the utility model the utility model comprises mercury cell assembly, pressure transmission conduit, inductor; Described mercury cell assembly contains U-shaped mercury cell I 15, electrode, in U-shaped mercury cell I 15, is marked with mercury; Left side mercury slug I 8 pipes of U-shaped mercury cell I 15 are connected with last inductor 1 through last inductor pressure transmission conduit I 2; U-shaped mercury cell I 15 right side mercury slug I 9 pipes pass through down, and inductor pressure transmission conduit 5 is connected with following inductor 4; In last inductor pressure transmission conduit 2, be filled with pressure transmitting medium I3; Be filled with pressure transmitting medium II6 in the inductor pressure transmission conduit 5 down, on the outer wall of left side mercury slug I 8 and right side mercury slug I 9, be respectively arranged with inductor lateral capacitance electrode 11 and following inductor lateral capacitance electrode 12; Be provided with the electrode I 13 that connects mercury in the bottom of U-shaped mercury cell I 15, the bottom in the U-shaped mercury cell I 15 also is provided with both sides mercury slug on-off valve I 14; Last inductor lateral capacitance electrode 11, inductor lateral capacitance electrode 12, the electrode I 13 that connects mercury are connected with electric capacity difference change-over circuit 21 respectively down; Electric capacity difference change-over circuit 21 is connected with transmission circuit 22, downhole transmitted cable 23, ground recording unit 24 with digitizing successively.
Described upward inductor lateral capacitance electrode 11 is identical with the length of following inductor lateral capacitance electrode 12, is 6mm.
Described pressure transmitting medium I3 and pressure transmitting medium II6 adopt insulating oil.
Left side mercury slug I 8 tube walls of described U-shaped mercury cell I 15 and right side mercury slug I 9 tube walls adopt insulating material to process, and the internal diameter of mercury column jecket is 4mm, and the wall thickness of mercury column jecket is 2mm.
Among Fig. 2, U-shaped mercury cell I 15 housings are made up of resistant to elevated temperatures insulating material, and pressure transmitting medium adopts insulating oil.Both sides mercury slug outer wall is a cylindrical insulator, and pressure-sensitive lateral capacitance cylindrical metal sleeve is inserted in as external electrode in the outside, promptly goes up inductor lateral capacitance electrode 11 and following inductor lateral capacitance electrode 12, and mercury slug is interior electrode.The height of left side mercury slug can be measured with the capacitance between the electrode I 13 that is connected mercury through last inductor lateral capacitance electrode 11.The height of right side mercury slug can be measured with the capacitance between the electrode I 13 that is connected mercury through following inductor lateral capacitance electrode 12.
Last inductor lateral capacitance electrode 11 is isometric with following inductor lateral capacitance electrode 12; Its length is decided by spacing
H of fluid density range for measuring and upper and lower inductor, generally between 5 to 10 centimetres.Because the mercury slug liquid level of (0-1.3 gram/
㎝ 3 usually) lower sensor side on average is higher than the mercury slug liquid level of upper sensor side in whole fluid density measurement range; following inductor lateral capacitance electrode 12 can be higher than inductor lateral capacitance electrode 11 to be installed, and suitably improves 0 to 3 centimetre.
The electrode I 13 that connects mercury is installed in the side-lower or the bottom of U-shaped mercury cell I.Both sides mercury slug on-off valve I 14 also is equipped with in the bottom of U-shaped mercury cell I 15.Both sides mercury is communicated as one during measurement.Before the instrument horizontal positioned and in the communications and transportation, all should close this valve, to prevent mutual the flowing of both sides pressure transmitting medium.
Fig. 3 is the metering circuit block diagram of downhole fluid density measuring equipment first embodiment of the utility model.As shown in Figure 3.The difference of the cylindrical electric capacity in U-shaped mercury cell I 15 both sides converts magnitude of voltage into by electric capacity difference change-over circuit 21, delivers to ground recording unit 24 through digitizing and transmission circuit 22, downhole transmitted cable 23 again.This partial circuit also can be designed to the downhole data storage, and formula is read on later stage ground.
Two cylindrical outer electrodes among Fig. 2 and as the last inductor lateral capacitance electrode 11 of coaxial electrode, inductor lateral capacitance electrode 12 mercury slug constitute two coaxial capacitances down; Its electric capacity and the mercury slug significant height in electrode is directly proportional, thereby the variation of the reflection in-hole fluid density that the difference of two electric capacity can be linear.In order to realize the measurement of capacitance, as the last inductor lateral capacitance electrode 11 of coaxial electrode, inductor lateral capacitance electrode 12 all must externally be wrapped insulating material with the electrode that is connected mercury 13 down, make the interior fluid of they and well isolated.One preferably solution be that whole U-shaped mercury cell I is installed in one section oil-overflow packoff nipple.
Embodiment 2
Fig. 4 is the diagrammatic cross-section of second embodiment of the utility model.Fig. 5 is the section of structure of bath resistance rate measurement column among second embodiment of the utility model.In Fig. 4, Fig. 5; Be second kind of structure of the downhole fluid density measuring equipment of the utility model; Present embodiment is identical with the basic structure of embodiment 1; Difference is; The described inductor lateral capacitance electrode 11 of going up replaces with inductor side resistance electrode 31 and following inductor side resistance electrode 32 respectively with following inductor lateral capacitance electrode 12, and the top of mercury slug II 18 and right side mercury slug II 19 is respectively arranged with inductor side resistance electrode 31 and following inductor side resistance electrode 32 in the left side of U-shaped mercury cell II 16, and last inductor side resistance electrode 31 contacts with pressure transmitting medium III 37, pressure transmitting medium IV 36 respectively with following inductor side resistance electrode 32.Described pressure transmitting medium III 37, pressure transmitting medium IV 36 adopt respectively and lead electrolyte solution.The left side mercury slug II 18 of described U-shaped mercury cell II 16 and the tube wall of right side mercury slug II 19 all adopt insulating material to process, and its internal diameter is 3mm.
Among Fig. 4, Fig. 5; U-shaped mercury cell II 16 integral body still are made up of high-temperature insulation material; The pressure transmitting medium III 37 pressure transmitting medium IV 36 of top adopt the electrolyte solution of conduction, on the top of 16 liang of arms of U-shaped mercury cell II two ring electrodes are set, and its electrode inboard and electrolyte contact.
Below U-shaped mercury cell II 16, be provided with the electrode II 43 and both sides mercury slug on-off valve II 44 that connect mercury.The resistivity of mercury is than electrolytical resistivity low 10
4Doubly, can disregard.Resistance R 1 in the measurement between inductor side resistance electrode 31 and the electrode II 43 that is connected mercury can be confirmed the height of left side mercury face.Measure the resistance R 2 between the inductor side resistance electrode 32 and the electrode II 43 that is connected mercury down, can confirm the height of right side mercury liquid level.Because electrolytical change in resistance receives Influence of Temperature bigger; Bath resistance rate measurement column 34 as the temperature effect correction is set again, and bath resistance rate measurement column 34 is provided with the bath resistance rate and measures top electrode 33 and bath resistance rate measurement bottom electrode 35.Measure the bath resistance rate and measure the resistance R 3 between top electrode 33 and the bath resistance rate measurement bottom electrode 35.While measure R 1, R2, R3 just can confirm left and right sides mercury face height, calculate the difference in height of mercury cylinder, thereby draw density of liquid value in the well.The advantage of present embodiment is that the metering circuit of resistance value is simpler, is not subject to external interference, reliable operation.Shortcoming is that bath resistance rate temperature influence is bigger, must revise with bath resistance rate measurement column 34 measurement data in the data processing.
Resistance measurement Data Acquisition process is similar with embodiment 1 in the present embodiment, just capacitance measurement circuit is changed and does the resistance measurement circuit, has added the measurement and the data correction of bath resistance rate simultaneously.
Described in Fig. 4, Fig. 5 in the resistance measurement inboard of inductor side resistance electrode 31 and following inductor side resistance electrode 32 be directly contacted with electrolyte solution.Because electrolytical resistivity is bigger with temperature variation, thereby a bath resistance rate measurement column 34 as the resistivity correction will be set, remake data correction after measuring simultaneously.Also the concentration with solute is relevant owing to electrolytical resistivity, so go up the pressure transmitting medium IV 36 of inductor in the present embodiment, the concentration of the medium in pressure transmitting medium III 37 and the bath resistance rate measurement column 34 of inductor will guarantee consistent down.
Claims (8)
1. a downhole fluid density measuring equipment is characterized in that, described measurement mechanism comprises mercury cell assembly, pressure transmission conduit, inductor; Described mercury cell assembly contains U-shaped mercury cell I (15), electrode, in U-shaped mercury cell I, is marked with mercury; Left side mercury slug I (8) pipe of U-shaped mercury cell I (15) is connected with last inductor (1) through last inductor pressure transmission conduit I (2); U-shaped mercury cell I (15) right side mercury slug I (9) pipe passes through down, and inductor pressure transmission conduit (5) is connected with following inductor (4); In last inductor pressure transmission conduit (2), be filled with pressure transmitting medium I (3); Being filled with pressure transmitting medium II (6) in the inductor pressure transmission conduit (5) down, on the outer wall of left side mercury slug I (8) and right side mercury slug I (9), be respectively arranged with inductor lateral capacitance electrode (11) and following inductor lateral capacitance electrode (12); Be provided with the electrode I (13) that connects mercury in the bottom of U-shaped mercury cell I (15), the bottom in the U-shaped mercury cell I (15) also is provided with both sides mercury slug on-off valve I (14); The electrode I (13) of last inductor lateral capacitance electrode (11), following inductor lateral capacitance electrode (12), connection mercury is connected with electric capacity difference change-over circuit (21) respectively; Electric capacity difference change-over circuit (21) is connected with transmission circuit (22), downhole transmitted cable (23), ground recording unit (24) with digitizing successively.
2. measurement mechanism according to claim 2 is characterized in that, described upward inductor lateral capacitance electrode (11) is identical with the length of following inductor lateral capacitance electrode (12).
3. measurement mechanism according to claim 1 is characterized in that, described pressure transmitting medium I (3) and pressure transmitting medium II (6) adopt insulating oil.
4. measurement mechanism according to claim 1; It is characterized in that; Left side mercury slug I (8) tube wall of described U-shaped mercury cell I (15) and right side mercury slug I (9) tube wall adopt insulating material to process, and the internal diameter of mercury column jecket is 3mm～6mm, and the wall thickness of mercury column jecket is 1mm～3mm.
5. measurement mechanism according to claim 1 is characterized in that, the described length that goes up inductor lateral capacitance electrode (11) and following inductor lateral capacitance electrode (12) is 5cm～10cm.
6. measurement mechanism according to claim 1; It is characterized in that; Described upward inductor lateral capacitance electrode (11) and following inductor lateral capacitance electrode (12) replace with inductor side resistance electrode (31) and following inductor side resistance electrode (32) respectively; Be respectively arranged with inductor side resistance electrode (31) and following inductor side resistance electrode (32) on the top of the left side of U-shaped mercury cell II (16) mercury slug II (18) and right side mercury slug II (19), last inductor side resistance electrode (31), following inductor side resistance electrode (32) contact with pressure transmitting medium III (37), pressure transmitting medium IV (36) respectively.
7. measurement mechanism according to claim 6 is characterized in that, described pressure transmitting medium III (37), pressure transmitting medium IV (36) adopt conducting electrolyte solution respectively.
8. measurement mechanism according to claim 6 is characterized in that, the left side mercury slug II (18) of described U-shaped mercury cell II (16) and the tube wall of right side mercury slug II (19) all adopt insulating material to process, and its internal diameter is 3mm～6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205426106U CN202372426U (en) | 2011-12-22 | 2011-12-22 | Underground fluid density measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205426106U CN202372426U (en) | 2011-12-22 | 2011-12-22 | Underground fluid density measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202372426U true CN202372426U (en) | 2012-08-08 |
Family
ID=46596123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205426106U Withdrawn - After Issue CN202372426U (en) | 2011-12-22 | 2011-12-22 | Underground fluid density measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202372426U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435534B (en) * | 2011-12-22 | 2017-04-12 | 四川省科学城久利电子有限责任公司 | Underground fluid density measuring device |
-
2011
- 2011-12-22 CN CN2011205426106U patent/CN202372426U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435534B (en) * | 2011-12-22 | 2017-04-12 | 四川省科学城久利电子有限责任公司 | Underground fluid density measuring device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102356307B (en) | Capacitive gage pressure sensor with vacuum dielectric | |
| CN201488834U (en) | Liquid level and liquid temperature measuring device | |
| CN110553763B (en) | Coplanar suspension type full-isolation sensor | |
| CN103292947A (en) | Novel capacitance plate suspension structure of differential motion metal capacitance diaphragm capsule | |
| CN207649818U (en) | A kind of intelligent transducer | |
| CN202372426U (en) | Underground fluid density measuring device | |
| CN101782417A (en) | Method and device for automatically measuring water-level variation | |
| CN205317300U (en) | Built -in liquid level measurement device | |
| CN202583323U (en) | Clamp holder for semi-permeable partition board method to jointly detect capillary pressure resistivity | |
| CN201679496U (en) | Underground liquid level monitor for gas storage well | |
| CN102435534A (en) | Underground fluid density measuring device | |
| CN206192571U (en) | Type of falling U pipe differential gauge | |
| CN105569653A (en) | Plumb shaft underground wet steam flow dryness measurement device and method | |
| CN201047788Y (en) | OEM pressure sensor | |
| CN103175509B (en) | Measuring cable and the system of measurement | |
| CN105021325A (en) | Capacitive pressure sensor | |
| CN204881935U (en) | Capacitanc pressure sensing device | |
| CN205138942U (en) | Liquid density on - line measuring device | |
| CN201731915U (en) | Liquid level detection device | |
| CN111551232A (en) | Vacuum tube type temp. difference liquid level meter | |
| CN105486376A (en) | Built-in type liquid level measurement device and working method thereof | |
| CN201716069U (en) | Device for measuring water-level fluctuation automatically | |
| CN102589795B (en) | Wind pressure sensor | |
| CN2570749Y (en) | Oil tank level electrode detecting apparatus | |
| CN104215294A (en) | Integrated type liquid-level transmitter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120808 Effective date of abandoning: 20170412 |
|
| AV01 | Patent right actively abandoned |