CN109297640B - Device and method for improving accuracy of vacuum ionization halogen gas detector - Google Patents
Device and method for improving accuracy of vacuum ionization halogen gas detector Download PDFInfo
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- CN109297640B CN109297640B CN201811088286.8A CN201811088286A CN109297640B CN 109297640 B CN109297640 B CN 109297640B CN 201811088286 A CN201811088286 A CN 201811088286A CN 109297640 B CN109297640 B CN 109297640B
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- detector
- vacuum
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- halogen gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/007—Leak detector calibration, standard leaks
Abstract
The invention discloses a device and a method for improving the accuracy of a vacuum ionization halogen gas detector, wherein the diameter of the detector is adjusted, so that the vacuum degree value of a sensor of a leak detector is changed, the electric signal value generated in the sensor of the leak detector is changed, and the factory set value of the leak detector is recovered, and further, the problem of drift of measurement data caused by the performance change of elements such as a vacuum pump, the sensor and the like in the use process of the vacuum ionization halogen gas detector is solved, and the measurement accuracy is more accurate. The method provided by the invention has the advantages of simple steps, ingenious design, simple operation, low cost, good effect, time and labor saving, and can generate good economic benefit and social effect.
Description
Technical Field
The invention belongs to the technical field of gas detection instruments, and particularly relates to a device and a method for improving the accuracy of a vacuum ionization halogen gas detector.
Background
The halogen gas detector mainly performs concentration measurement by vacuum ionization of gas containing fluorine (F), chlorine (Cl), bromine (Br), iodine (I) and astatine (At). The sulfur hexafluoride gas is used for detecting the sulfur hexafluoride gas, belongs to inert gas, is mainly used in the industries of high-voltage switch manufacturing industry, power transmission and distribution power systems, precision casting and the like, and particularly is used in the high-voltage switch. Therefore, each high-voltage switch manufacturer uses sulfur hexafluoride gas leakage detection as a factory-required inspection item, and a power supply system uses a sulfur hexafluoride gas leakage detection test as a regular inspection item.
The existing sulfur hexafluoride gas quantitative leak detector generally measures the concentration at 10-6-10-4The concentration that needs to measure is lower, along with the use of equipment, reasons such as vacuum pump oil reduction, pipeline seal variation all can influence measuring result, take place occasionally to measure inaccurate phenomenon, are unfavorable for the accurate measurement to product inspection, cause the erroneous judgement of product qualification nature easily.
Disclosure of Invention
The invention aims to provide a device and a method for improving the accuracy of a vacuum ionization halogen gas detector, and solves the problem that the vacuum ionization halogen gas quantitative leak detector in the prior art is inaccurate in measurement.
The technical scheme adopted by the invention is as follows: the utility model provides a method for improving vacuum ionization halogen class gas detector degree of accuracy which characterized in that changes the pipe diameter of leak detector evacuation pipeline, changes the vacuum in the leak detector sensor, and then lets the signal of telecommunication that the gas under test produced resume to factory setting to improve the accuracy of testing result, specific method includes following step:
step 1: sucking gas to be detected with standard concentration by using a vacuum ionization halogen gas detector;
step 2: continuously adjusting the pipeline drift diameter of the vacuum ionized halogen gas detector by using a device for improving the accuracy of the vacuum ionized halogen gas detector until the concentration measured value of the gas measured by the leak detector is the same as a standard value;
and step 3: and after the adjustment is finished, the accuracy of the vacuum ionization halogen gas detector reaches a factory state, and normal measurement can be carried out.
The invention is also characterized in that:
the specific method for adjusting the vacuum ionized halogen gas detector in the step 2 comprises the following steps:
when the measured value of the sulfur hexafluoride concentration measured by the leak detector is lower than the standard gas concentration value, the regulating valve is used for reducing the drift diameter of the detector, and the electric signal generated by the sensor of the leak detector is increased.
The vacuum ionized halogen gas is sulfur hexafluoride gas, fluorine, chlorine, chloroform, freon F11, F12, F13, and F22.
The utility model provides an improve device of vacuum ionization halogen type gas detection appearance degree of accuracy, includes the handle, passes through threaded connection between handle and the fixed plate, and the handle passes the fixed plate and contacts with last briquetting, goes up the briquetting surface and is provided with the recess, the terminal joint of handle is in the recess of last briquetting, and the one side that goes up the briquetting and the fixed plate is opposite is provided with down the briquetting.
A vacuum ionization halogen gas detector mainly carries out concentration measurement by vacuum ionization of gas containing fluorine (F), chlorine (Cl), bromine (Br), iodine (I) and astatine (At), wherein fluorine-containing sulfur hexafluoride gas is widely applied in the power industry.
The pipe diameter of the pipeline of the leak detector can be changed in various ways, can be changed by applying external force to the pipeline, and can also be changed by connecting valves in series on the pipeline and adjusting the size of the drift diameter of the valves, and the method for changing the pipe diameter is only one of the methods.
The invention has the beneficial effects that:
the device and the method for improving the accuracy of the vacuum ionization halogen gas detector solve the problem of drift of measurement data caused by performance change of elements such as a vacuum pump, a sensor and the like in the long-term use process of the vacuum ionization halogen gas detector, and enable the measurement precision to be more accurate.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for improving the accuracy of a vacuum ionized halogen gas detector according to the present invention;
FIG. 2 is a graph showing a standard relationship between gas concentration and electrical signal in the method for improving the accuracy of the vacuum ionized halogen gas detector of the present invention.
In the figure, 1 is a handle, 2 is a fixing plate, 3 is an upper pressing block, 4 is a lower pressing block, 5 is a leak detector pipeline.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a method for improving the accuracy of a vacuum ionization halogen gas detector, which is characterized in that the vacuum degree in a sensor of a leak detector is changed by changing the pipe diameter of a vacuumizing pipeline of the leak detector, and further an electric signal generated by the detected gas is restored to factory setting so as to improve the accuracy of a detection result, and the method specifically comprises the following steps:
step 1: sucking gas to be detected with standard concentration by using a vacuum ionization halogen gas detector;
step 2: continuously adjusting the pipeline drift diameter of the vacuum ionized halogen gas detector by using a device for improving the accuracy of the vacuum ionized halogen gas detector until the concentration measured value of the gas measured by the leak detector is the same as a standard value;
and step 3: and after the adjustment is finished, the accuracy of the vacuum ionization halogen gas detector reaches a factory state, and normal measurement can be carried out.
The specific method for adjusting the vacuum ionized halogen gas detector in the step 2 comprises the following steps:
when the concentration measurement value of the sulfur hexafluoride measured by the leak detector is higher than the concentration value of the standard gas, the drift diameter of the detector is increased by using the regulating valve, the vacuum value in the sensor of the leak detector is reduced along with the decrease of the vacuum value, and the measurement electric signal generated by the sensor of the leak detector is reduced along with the decrease of the vacuum value until the concentration measurement value of the sulfur hexafluoride measured by the leak detector is equal to the standard value; finishing the adjustment; when the concentration measurement value of the sulfur hexafluoride gas measured by the leak detector is lower than the concentration value of the standard gas, the drift diameter of the detector is reduced by using the regulating valve, the vacuum value in the sensor of the leak detector is increased along with the change of the vacuum value, the electric signal generated by the sensor of the leak detector is increased along with the change of the vacuum value until the concentration measurement value of the sulfur hexafluoride gas measured by the leak detector is the same as the standard value, and the regulation is finished;
the vacuum ionized halogen gas is sulfur hexafluoride gas, fluorine, chlorine, chloroform, freon F11, F12, F13, and F22.
A device for improving the accuracy of a vacuum ionization halogen gas detector is shown in figure 1 and comprises a handle 1, wherein the handle 1 is assembled on a fixed plate 2 through threads, the handle 1 penetrates through the fixed plate 2 to be propped against an upper pressing block 3, and the upper pressing block 3 and a lower pressing block 4 are respectively fixed above and below an instrument pipeline 5. The using method of the device specifically comprises the steps that the upper pressing block 3 is pressed downwards by rotating the handle 1 clockwise, the distance between the upper pressing block 3 and the lower pressing block 4 becomes small, the drift diameter of the instrument pipeline 5 (made of silicone tubes) becomes small, the handle 1 is rotated anticlockwise, the pressure on the upper pressing block 3 is reduced, the pressure on the instrument pipeline 5 is reduced, the pipeline returns to the original state, and the drift diameter of the pipeline is increased.
The invention relates to a method for improving the accuracy of a vacuum ionization halogen gas detector, which has the following principle:
the invention relates to a quantitative leak detector for vacuum ionization halogen gas, which ionizes the gas to be detected under a certain vacuum degree and measures the gas concentration by capturing the number of electrons. Taking sulfur hexafluoride gas as an example, in the manufacturing process of the leak detector, the sulfur hexafluoride quantitative leak detector is used for measuring standard gas with different concentrations, and values of electric signals generated by the sensor corresponding to different concentrations are recorded, as shown in fig. 2, a smooth measurement curve is drawn and used as a detection basis in the using process of the leak detector. When the leak detector is used, the sensor generates different electric signals according to different concentrations, the electric signals are compared with the measurement curve, the concentration value corresponding to the gas to be detected can be obtained,
the following are several sets of experimental data of the invention using a quantitative sulfur hexafluoride leak detector as an example:
| concentration (ppm) | 0 | 1 | 5 | 10 | 20 | 40 | 60 | 80 | 100 |
| Factory calibration value | 273 | 585 | 1006 | 1289 | 1563 | 1758 | 1806 | 1855 | 1895 |
| |
254 | 527 | 898 | 1152 | 1426 | 1641 | 1680 | 1758 | 1797 |
| |
273 | 580 | 1006 | 1290 | 1560 | 1760 | 1800 | 1860 | 1896 |
| |
293 | 645 | 1055 | 1387 | 1660 | 1855 | 1891 | 1930 | 1953 |
| |
273 | 590 | 1006 | 1286 | 1565 | 1751 | 1805 | 1854 | 1894 |
| |
313 | 684 | 1133 | 1426 | 1690 | 1892 | 1934 | 1968 | 1992 |
| |
273 | 585 | 1006 | 1291 | 1569 | 1755 | 1804 | 1853 | 1893 |
The unit of concentration of the table is 10-6(volume ratio), factory calibration value, deviation and calibration unit are millivolts
When the leak detector deviates along with use, the second row of the table refers to a calibration value of the leak detector when the leak detector leaves a factory, the measured value of the third row is smaller than the standard value, and the measured values of the fifth row and the seventh row are larger than the standard value. After 5ppm standard concentration sulfur hexafluoride gas is adjusted by the steps 1, 2 and 3, the electric signal value of the sensor at 5ppm is restored to the set value when leaving the factory, and the electric signal values of the sensors at other concentrations are also close to the set value when leaving the factory.
The invention relates to a method for improving the accuracy of a vacuum ionization halogen gas leak detector, which can calibrate the leak detector by sucking a certain standard gas and adjusting the diameter of a pipe, can calibrate the deviation of the whole measurement curve, and not only calibrates the deviation only aiming at a certain specific concentration.
According to the device and the method for improving the accuracy of the vacuum ionization halogen gas detector, the pipe diameter of the detector is adjusted, so that the vacuum degree value of a sensor of a leak detector is changed, an electric signal value generated in the sensor of the leak detector is changed, and a factory set value of the leak detector is recovered, the problem of drift of measurement data caused by performance changes of elements such as a vacuum pump and the sensor in the use process of the vacuum ionization halogen gas detector is solved, and the measurement accuracy is more accurate. The method provided by the invention has the advantages of simple steps, ingenious design, low cost, favorable effect, time and labor saving, and can generate good economic benefit and social effect.
Claims (2)
1. The utility model provides a method for improving vacuum ionization halogen class gas detector degree of accuracy which characterized in that changes the pipe diameter of leak detector evacuation pipeline, changes the vacuum in the leak detector sensor, and then lets the signal of telecommunication that the gas under test produced resume to factory setting to improve the accuracy of testing result, specific method includes following step:
step 1: sucking gas to be detected with standard concentration by using a vacuum ionization halogen gas detector;
step 2: continuously adjusting the pipeline drift diameter of the vacuum ionized halogen gas detector by using a device for improving the accuracy of the vacuum ionized halogen gas detector until the concentration measured value of the gas measured by the leak detector is the same as a standard value;
and step 3: after the adjustment is finished, the accuracy of the vacuum ionization halogen gas detector reaches a factory state, and normal measurement can be carried out;
the specific method for adjusting the vacuum ionized halogen gas detector in the step 2 comprises the following steps:
when the measured value of the concentration of the sulfur hexafluoride gas measured by the leak detector is lower than the concentration value of the standard gas, the regulating valve is used for reducing the drift diameter of the detector, and the electric signal generated by the sensor of the leak detector is increased.
2. The method as claimed in claim 1, wherein the vacuum ionized halogen gas detector is selected from the group consisting of sulfur hexafluoride gas, fluorine, chlorine, chloroform, freon F11, F12, F13, and F22.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811088286.8A CN109297640B (en) | 2018-09-18 | 2018-09-18 | Device and method for improving accuracy of vacuum ionization halogen gas detector |
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| CN201811088286.8A CN109297640B (en) | 2018-09-18 | 2018-09-18 | Device and method for improving accuracy of vacuum ionization halogen gas detector |
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| CN109297640B true CN109297640B (en) | 2021-03-05 |
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| CN102287547A (en) * | 2010-06-17 | 2011-12-21 | 励土峰 | Flexible pipe valve device |
| CN102494852B (en) * | 2011-12-06 | 2014-05-28 | 中国航天科技集团公司第五研究院第五一〇研究所 | Method for calibrating helium mass spectrometer leak detector |
| CN102589803A (en) * | 2012-02-06 | 2012-07-18 | 江苏东方航天校准检测有限公司 | Portable multifunctional vacuum calibration system and method |
| CN102538916A (en) * | 2012-02-06 | 2012-07-04 | 江苏东方航天校准检测有限公司 | Portable gas micro-flow calibration system and method thereof |
| CN104280199A (en) * | 2014-09-12 | 2015-01-14 | 兰州空间技术物理研究所 | Mass spectrograph linear section testing method |
| CN107543661B (en) * | 2016-07-22 | 2019-11-26 | 北京卫星环境工程研究所 | The adjustable vacuum leak hunting automated system of sensitivity |
| CN106768686A (en) * | 2016-12-05 | 2017-05-31 | 安徽皖仪科技股份有限公司 | A kind of method for improving helium mass spectrometer leak detector sensitivity |
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