CN117367548A - Device and method for calibrating length of detection scale rod of magnetic liquid level meter - Google Patents
Device and method for calibrating length of detection scale rod of magnetic liquid level meter Download PDFInfo
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- CN117367548A CN117367548A CN202311404149.1A CN202311404149A CN117367548A CN 117367548 A CN117367548 A CN 117367548A CN 202311404149 A CN202311404149 A CN 202311404149A CN 117367548 A CN117367548 A CN 117367548A
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- 238000001514 detection method Methods 0.000 title claims abstract description 127
- 239000007788 liquid Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000013519 translation Methods 0.000 claims abstract description 34
- 230000006698 induction Effects 0.000 claims abstract description 21
- 238000012937 correction Methods 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 3
- 238000013508 migration Methods 0.000 claims description 2
- 230000005012 migration Effects 0.000 claims description 2
- 239000000523 sample Substances 0.000 claims 1
- 238000013461 design Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
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- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention discloses a length calibration device and a length calibration method for a magnetic liquid level meter detection scale rod, wherein the length calibration device comprises a calibration frame, the calibrated liquid level meter detection scale rod is horizontally placed on the frame, a liquid level meter floater is sleeved on a detection scale rod, guide rails are respectively arranged on two sides of the calibration frame, a magnetic grating ruler is arranged between the guide rails on two sides, the detection scale rod is positioned beside the magnetic grating ruler and parallel to the magnetic grating ruler, a translation detection table is arranged across the magnetic grating ruler and the detection scale rod, the translation detection table is supported on the guide rails on two sides through two guide rail sliding blocks, the lower end of the translation detection table is close to the magnetic grating ruler and is provided with a magnetic induction reading head, the liquid level meter floater is fixedly connected with the translation detection table, the horizontal movement translation detection table drives the magnetic induction reading head and the liquid level meter floater to move at the same time, and the length calibration of the detection scale rod is realized by comparing the read distance data of the magnetic induction reading head moving on the magnetic grating ruler with the distance data of the floater induced by the detection scale rod moving on the detection scale rod.
Description
Technical Field
The invention relates to a length calibration device and method for a detection scale rod of a magnetic liquid level meter.
Background
Liquid levels in the pharmaceutical, chemical, storage tank, etc. industries are typically measured using a level gauge. The magnetostrictive liquid level meter is a main force product for liquid level measurement and liquid level control, and consists of an electronic transmitter, a detection rod and a floater. The float floats up and down along the detection rod along with the change of the liquid level. When the pulse current magnetic field in the detecting rod meets the magnetic ring magnetic field generated by the floater, the magnetic field around the floater changes, so that a wave guide wire made of magnetostrictive material generates a torsional wave pulse at the position of the floater, and the pulse is transmitted back along the wave guide wire at a fixed speed and detected by a detection mechanism. By measuring the time difference between the pulse current and the torsional wave, the position of the float, i.e. the liquid level, can be determined accurately.
The measurement precision of the magnetostrictive liquid level meter can reach within +/-1 mm. However, at present, a traditional length measurement positioning mode is adopted for the correction of the liquid level measurement scale, namely: the calibration float is measured to the position of the reference surface by using the graduations of the tape measure or the steel plate ruler, the manual movement is to the fixed graduations, and the visual reading method has low working efficiency. The tape measure or the steel plate rule has errors, the placement position of the measuring scale is measured, the reading errors are visually detected (even affected by light), and the accumulated measurement errors caused by the factors cannot fully ensure the detection precision of the magnetostrictive liquid level meter. In addition, the design of the measuring platform of the existing length measuring instruments does not accord with the Abbe length measuring principle. The secondary error caused by the dislocation of the three-dimensional space of the standard ruler and the measured object is ignored, and is erroneously understood as a standard value, so that the distortion error of the actual measured value is increased, and the measurement accuracy is reduced.
Disclosure of Invention
The invention aims to provide a length calibration device and method for a detection scale rod of a magnetic liquid level meter, wherein correction equipment and a detected correction detection scale rod are arranged on a correction platform based on an Abbe principle, so that the detection efficiency is improved, a true detection value is restored, and the device and method for detecting the length of the magnetic liquid level meter are long-distance high-precision length according with the length measurement principle.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the utility model provides a magnetic level gauge surveys scale pole length calibration device, includes the calibration frame that sets up on the cement foundation, and the level gauge that is calibrated surveys the scale pole level and places on the frame, the level gauge float cover is on surveying the scale pole, calibration frame both sides are the level respectively and are provided with the guide rail, and both sides guide rail are parallel to each other, be provided with the magnetic grating chi base station between the both sides guide rail, be provided with the magnetic grating chi on the base station in parallel with both sides guide rail, survey the scale pole location and be on magnetic grating chi base station next door side and be on magnetic grating chi setting, it is provided with a translation detection platform to span magnetic grating chi and survey the scale pole, translation detection platform supports on both sides guide rail through two guide rail sliders, translation detection platform lower extreme is close to the magnetic grating chi and is provided with magnetic induction reading head, the level gauge float is connected fixedly through the link plate with translation detection platform, and the horizontal migration translation detection platform drives the reading head along the magnetic grating chi and removes, drives the level gauge float along the detection pole and removes, corrects the reference with the magnetic grating on the base station as length scale, through the distance to the reading head that reads on the magnetic grating scale moves on the magnetic grating scale and detects the scale pole and detects the distance of scale pole and carries out magnetic induction calibration data.
The scheme is further as follows: the side wall of the magnetic grid ruler base station is provided with a steel plate ruler in an attached mode, and the lower end of the translation detection station is provided with a pointer corresponding to scales of the steel plate ruler.
The scheme is further as follows: the central axes of the magnetic grating ruler and the detection ruler rod are positioned in a horizontal plane, and the horizontal distance between the magnetic grating ruler and the detection ruler rod is 120mm.
The scheme is further as follows: the guide rail is a double-shaft guide rail, and the guide rail sliding block is matched with the double-shaft guide rail.
The scheme is further as follows: the magnetic grating ruler base station is arranged on the calibration frame through horizontal calibration positioning by the whole 40mm square aluminum profile, grooves are longitudinally formed in the upper surface of the magnetic grating ruler base station, the width and the depth of the grooves are equal to those of the magnetic grating ruler, the magnetic grating ruler is stuck in the grooves, and the upper surface of the magnetic grating ruler is flush with the upper surface of the magnetic grating ruler base station to form a plane.
The scheme is further as follows: the calibration frame is formed by connecting 40mm square aluminum sections in a segmented mode, the length of the two guide rails is 4.5 meters, and the horizontal distance between the magnetic grating ruler and the detection scale rod is 120mm.
The calibration method based on the calibration device for the length of the detection scale rod of the magnetic liquid level meter comprises the steps of placing a calibration frame in a thermostatic chamber at 25+/-0.5 ℃ and horizontally correcting the calibration frame, wherein the method comprises the steps of determining the correction starting position and determining the reading accuracy of the moving distance of a floater along the detection scale rod:
the correction start position determination is: pushing the translation detection platform to move the liquid level meter floater to the root of the detection scale rod until the detection scale rod displays a position with the length of 0, wherein the liquid level meter floater is positioned at the initial position of the origin of the detection scale rod, namely the initial position is corrected, meanwhile, the position data of the magnetic induction reading head at the magnetic grid scale is read, and if the position data is not 0, the reading is adjusted to be 0;
the reading accuracy of the distance of the floater along the detection scale rod is as follows: moving a translation detection table from a starting position to the length direction of the detection scale rod, respectively reading the length data displayed by the detection scale rod and the length data displayed by the magnetic induction reading head at intervals until the longest length of the detection scale rod, calculating the error of the same interval data of the two, and determining the measurement precision of the detection scale rod according to the error; the correction is ended.
The scheme is further as follows: the interval reading is to use a magnetic grating ruler as a length reading standard, and each interval is 10mm or 20mm to follow the length data displayed by the reading detection scale ruler.
The scheme is further as follows: the method is further as follows: the magnetic grating ruler is characterized in that a steel plate ruler is attached to the side wall of the magnetic grating ruler base station, a pointer corresponding to the scale of the steel plate ruler is arranged at the lower end of the translation detection station, the pointer corresponding to the scale of the steel plate ruler is firstly visually inspected before each reading, and whether the length data displayed by the detection ruler rod or the length data range displayed by the magnetic induction reading head are correct or not is determined by the length dimension of the steel plate ruler.
The scheme is further as follows: the horizontal correction to the calibration frame is the horizontal correction through laser range finder cooperation horizon rule, wherein: the upper end face of the frame is leveled by a leveling ruler, and the height of the upper end face of the frame is leveled by a laser range finder.
The beneficial effects of the invention are as follows: the magnetic grating ruler is arranged on the correction platform based on the Abbe principle to serve as length reading standard correction equipment and a detected correction detection scale rod, so that the detection efficiency is improved, and the true detection value is restored.
The present invention will be described in detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic structural view of a translation detecting stage according to the present invention.
Detailed Description
Example 1:
the utility model provides a length calibration device of magnetic level gauge detection scale pole for length calibration of long detection scale pole, as shown in fig. 1 and 2, length calibration device includes calibration frame 1 that sets up on the cement foundation, calibration frame 1 platform vertical one end is provided with by calibrated level gauge base 2, level gauge base 2 is connected with the digital display table 4 of level gauge detection scale pole 3, digital display table 4 shows the position that level gauge float 5 is located on detection scale pole 3, calibration frame 1 platform vertical other end is provided with the locating terminal 6 of detection scale pole 3, by calibrated level gauge detection scale pole 3 place on frame 1 through level gauge base 2 and locating terminal 6 level, level gauge float 5 cover is on detection scale pole 3, calibration frame 1 both sides are provided with guide rail 7 respectively horizontally each other, both sides guide rail 7 are parallel to each other, be provided with magnetic grid base 8 between the both sides guide rail 7, magnetic grid base 8 is provided with magnetic grid 9 in the 60mm of the partial inside of center axis between both sides guide rail 7, the base is provided with magnetic grid 9 in parallel to both sides guide rail on the base, detection scale pole 3 is located in parallel with magnetic grid base 8 and is provided with magnetic grid 9 next to magnetic grid base 8. The length calibration for the long detection scale rod is realized by the fact that a calibration frame is formed by connecting 40mm square aluminum sections in a segmented mode, the length of two guide rails is 4.5 meters, the horizontal distance between a magnetic grating ruler and the detection scale rod is 120mm, the installation mode is to follow abbe measurement rectangular layout, the standard line of the magnetic grating ruler 9 and the detected line of the detected liquid level meter detection scale rod 3 are longitudinally parallel along a frame body, the minimum equidistant distance is transversely kept by 120mm, the axis of the detection scale rod 3 and the magnetic grating ruler 9 are located in the same horizontal plane, the length measurement error is eliminated to the maximum extent, and the accuracy repeatability and the long-term stability of the length measurement are improved.
A translation detection table 10 is arranged across the magnetic grating ruler base 8, the magnetic grating ruler 9 and the detection scale rod 3, the translation detection table 10 is supported on the guide rails 7 on two sides through two guide rail sliding blocks 11, a magnetic induction reading head 13 is arranged at the lower end of the translation detection table 10, which is close to the magnetic grating ruler, through a reading head hanging plate 12, a reading display meter 1301 of the magnetic induction reading head 13 is fixed at the upper end of the translation detection table 10, the liquid level meter floater 5 is fixedly connected with the translation detection table 10 through a floater hanging plate 14, the horizontal movement translation detection table 10 drives the magnetic induction reading head 13 to move along the magnetic grating ruler 9, and simultaneously drives the liquid level meter floater 5 to move along the detection scale rod 3, the accuracy of the magnetic grating ruler 9 is +/-0.02 mm, and the detection accuracy of the detection rod 3 is +/-0.5 mm.
In the examples: a steel plate ruler 15 is attached to the side wall of the magnetic grid ruler base 8, and a pointer 16 corresponding to the scale of the steel plate ruler is arranged at the lower end of the translation detection table.
Wherein: the central axes of the magnetic grating ruler and the detection scale rod are positioned in a horizontal plane, and meanwhile, the horizontal distance between the magnetic grating ruler and the detection scale rod is 120mm; the space relative positions of the magnetic grating ruler and the detection ruler rod follow and accord with the Abbe length measurement design principle. In the embodiment, the guide rail is a double-shaft guide rail, and the guide rail sliding block is matched with the double-shaft guide rail, so that the moving precision of the translation detection table 10 is ensured.
In the examples: the magnetic grid ruler base 8 is formed by horizontally calibrating and positioning a whole square aluminum profile with the length of 5 meters and the length of 40mm on a calibration frame, wherein the linear thermal expansion coefficient of the aluminum profile is 23.5E-06, and the aluminum profile is placed in a constant temperature chamber (25+/-0.5 ℃), and the full-range thermal extension of 4.5 meters is +/-0.05 mm, so that the requirement of the device on measuring precision is met; the upper surface of the magnetic grid ruler base station is longitudinally provided with a groove, the width and the depth of the groove are equal to those of the magnetic grid ruler, the magnetic grid ruler is stuck in the groove, and the upper surface of the magnetic grid ruler is flush with the upper surface of the magnetic grid ruler base station to form a plane.
In the examples: at least three arc-shaped brackets 17 are arranged on the calibration frame 1 along the lower end of the detection scale rod 3 and are supported under the liquid level meter detection rod 3 in a segmented mode, the detection scale rod 3 is kept from falling down, the positions of the arc-shaped brackets 17 can be transversely shifted and adjusted, and the liquid level meter detection rod 3 is ensured to be transversely unbent. The tail end of the liquid level meter detection rod 3 is inserted into an end bearing hole of the positioning terminal 6 which is accurately matched, so that the liquid level meter detection scale rod 3 is ensured to be longitudinally straight.
Example 2:
the calibration method of the length calibration device based on the magnetic liquid level meter detection scale rod comprises the steps of placing a calibration frame in a thermostatic chamber at 25+/-0.5 ℃ to perform horizontal correction on the calibration frame, wherein the method comprises the steps of determining the correction starting position and determining the reading accuracy of the moving distance of a floater along the detection scale rod:
the correction start position determination is: pushing the translation detection platform to move the liquid level meter floater to the root of the detection scale rod until the detection scale rod shows a 0 position, wherein the liquid level meter floater is positioned at the initial position of the origin of the detection scale rod, namely the initial position is corrected, meanwhile, the position data of the magnetic induction reading head on the magnetic grid scale is read, and if the position data is not 0, the reading is adjusted to be 0;
the reading accuracy of the distance of the floater along the detection scale rod is as follows: moving a translation detection table from a starting position to the length direction of the detection scale rod, respectively reading the length data displayed by the detection scale rod and the length data displayed by the magnetic induction reading head at intervals until the longest length of the detection scale rod, calculating the error of the same interval data of the two, and determining the measurement precision of the detection scale rod according to the error; the correction is ended.
Wherein: the interval reading is to use a magnetic grating ruler as a length reading standard, and each interval is 10mm or 20mm to follow the length data displayed by the reading detection scale ruler.
The method is further as follows: the magnetic grating ruler is characterized in that a steel plate ruler is attached to the side wall of the magnetic grating ruler base station, a pointer corresponding to the scale of the steel plate ruler is arranged at the lower end of the translation detection station, the pointer corresponding to the scale of the steel plate ruler is firstly visually inspected before each reading, and whether the length data displayed by the detection ruler rod or the length data range displayed by the magnetic induction reading head are distorted correctly is determined by the length dimension of the steel plate ruler.
Wherein: the horizontal correction to the calibration frame is the horizontal correction through laser range finder cooperation horizon rule, wherein: the upper end face of the frame is leveled by a leveling ruler, and the height of the upper end face of the frame is leveled by a laser range finder.
Claims (10)
1. The utility model provides a magnetic level gauge surveys scale pole length calibration device, includes the calibration frame that sets up on the cement foundation, and the level gauge that is calibrated surveys the scale pole level and places on the frame, and the level gauge float cover is on surveying the scale pole, its characterized in that, calibration frame both sides are provided with the guide rail horizontally respectively, and both sides guide rail are parallel to each other, be provided with the magnetic grating chi base between the guide rail of both sides, be provided with the magnetic grating chi on the base parallel with both sides guide rail, it is parallel to the setting of magnetic grating chi base next door to survey the scale pole, and it is provided with a translation detection platform to span magnetic grating chi and survey the scale pole, and translation detection platform is provided with magnetic induction reading head through two guide rail slider supports on both sides guide rail, the level gauge float is connected fixedly through link plate and translation detection platform, and horizontal migration translation detection platform drives the magnetic induction reading head simultaneously and moves along the magnetic grating chi pole, drives the level gauge float and moves along the detection scale pole, and regards the magnetic grating chi as the length correction benchmark to realize the magnetic induction scale on the distance ratio detection scale pole through the data to the distance of reading head that detects the magnetic induction on the scale pole that moves.
2. The device for calibrating the length of the detection scale rod according to claim 1, wherein a steel plate scale is attached to the side wall of the magnetic grid scale base station, and a pointer corresponding to the scale of the steel plate scale is arranged at the lower end of the translation detection station.
3. A length calibration device for a detection scale bar according to claim 1, wherein the magnetic grating and the detection scale bar central axis are in a single horizontal plane, and the horizontal distance between the magnetic grating and the detection scale bar is 120mm.
4. The device of claim 1, wherein the rail is a dual-axis rail, and the rail slider is configured to mate with the dual-axis rail.
5. The length calibration device for the detection scale rod according to claim 1, wherein the magnetic grid scale base station is placed on the calibration frame through horizontal calibration positioning by a whole 40mm square aluminum profile, grooves are longitudinally formed in the upper surface of the magnetic grid scale base station, the width and depth of the grooves are equal to those of the magnetic grid scale, the magnetic grid scale is adhered to the grooves, and the upper surface of the magnetic grid scale is flush with the upper surface of the magnetic grid scale base station to form a plane.
6. The device for calibrating the length of a detection scale rod according to claim 1, wherein the calibration frame is formed by connecting 40mm square aluminum profiles in sections, and the length of the two guide rails is 4.5 meters.
7. A calibration method based on the calibration device of the length of the detection scale rod of the magnetic liquid level meter, which is characterized in that the calibration frame is placed in a thermostatic chamber with the temperature of 25+/-0.5 ℃ to carry out horizontal correction on the calibration frame, and the method comprises the steps of determining the correction starting position and determining the reading accuracy of the moving distance of a floater along the detection scale rod:
the correction start position determination is: pushing the translation detection platform to move the liquid level meter floater to the root of the detection scale rod until the detection scale rod shows a 0 position, wherein the liquid level meter floater is positioned at the initial position of the origin of the detection scale rod, namely the initial position is corrected, meanwhile, the position data of the magnetic induction reading head on the magnetic grid scale is read, and if the position data is not 0, the reading is adjusted to be 0;
the reading accuracy of the distance of the floater along the detection scale rod is as follows: moving a translation detection table from a starting position to the length direction of the detection scale rod, respectively reading the length data displayed by the detection scale rod and the length data displayed by the magnetic induction reading head at intervals until the longest length of the detection scale rod, calculating the error of the same interval data of the two, and determining the measurement precision of the detection scale rod according to the error; the correction is ended.
8. The method of claim 7, wherein the interval reading is based on a magnetic grid ruler as a length reading standard, and each interval of 10mm or 20mm follows the length data displayed by the reading probe ruler.
9. The method according to claim 7, characterized in that the method is further: the magnetic grating ruler is characterized in that a steel plate ruler is attached to the side wall of the magnetic grating ruler base station, a pointer corresponding to the scale of the steel plate ruler is arranged at the lower end of the translation detection station, the pointer corresponding to the scale of the steel plate ruler is firstly visually inspected before each reading, and whether the length data displayed by the detection ruler rod or the length data range displayed by the magnetic induction reading head are correct or not is determined by the length dimension of the steel plate ruler.
10. The method of claim 7, wherein the leveling of the calibration frame is by a laser rangefinder in combination with a level, wherein: the upper end face of the frame is leveled by a leveling ruler, and the height of the upper end face of the frame is leveled by a laser range finder.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311404149.1A CN117367548A (en) | 2023-10-27 | 2023-10-27 | Device and method for calibrating length of detection scale rod of magnetic liquid level meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311404149.1A CN117367548A (en) | 2023-10-27 | 2023-10-27 | Device and method for calibrating length of detection scale rod of magnetic liquid level meter |
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| CN117367548A true CN117367548A (en) | 2024-01-09 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010121507A1 (en) * | 2009-04-24 | 2010-10-28 | 广州市诺信数字测控设备有限公司 | Supporting plate structure for magnetoscale |
| DE102011000486A1 (en) * | 2011-02-03 | 2012-08-09 | Tr Electronic Gmbh | Coded magnetostrictive absolute position measuring system, particularly length measuring system for determining position of two objects, comprises magnetic code carrier which is arranged at object |
| CN203893917U (en) * | 2014-06-17 | 2014-10-22 | 北京航天时空科技有限公司 | Magnetostriction liquid level instrument calibration device |
| CN105136253A (en) * | 2015-09-07 | 2015-12-09 | 丹东通博电器(集团)有限公司 | Magnetostrictive liquid level meter detection device |
| CN207456570U (en) * | 2017-11-08 | 2018-06-05 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of vertical magnetostriction liquidometer testing calibration device |
| CN116447961A (en) * | 2023-06-16 | 2023-07-18 | 广东润宇传感器股份有限公司 | Magnetic scale positioning calibration test system |
| CN116519101A (en) * | 2023-01-13 | 2023-08-01 | 潍坊亚峰化工仪表有限公司 | Automatic detection, calibration and correction system for wide-range liquid level meter |
-
2023
- 2023-10-27 CN CN202311404149.1A patent/CN117367548A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010121507A1 (en) * | 2009-04-24 | 2010-10-28 | 广州市诺信数字测控设备有限公司 | Supporting plate structure for magnetoscale |
| DE102011000486A1 (en) * | 2011-02-03 | 2012-08-09 | Tr Electronic Gmbh | Coded magnetostrictive absolute position measuring system, particularly length measuring system for determining position of two objects, comprises magnetic code carrier which is arranged at object |
| CN203893917U (en) * | 2014-06-17 | 2014-10-22 | 北京航天时空科技有限公司 | Magnetostriction liquid level instrument calibration device |
| CN105136253A (en) * | 2015-09-07 | 2015-12-09 | 丹东通博电器(集团)有限公司 | Magnetostrictive liquid level meter detection device |
| CN207456570U (en) * | 2017-11-08 | 2018-06-05 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of vertical magnetostriction liquidometer testing calibration device |
| CN116519101A (en) * | 2023-01-13 | 2023-08-01 | 潍坊亚峰化工仪表有限公司 | Automatic detection, calibration and correction system for wide-range liquid level meter |
| CN116447961A (en) * | 2023-06-16 | 2023-07-18 | 广东润宇传感器股份有限公司 | Magnetic scale positioning calibration test system |
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