CN115265724A - Liquid level meter field calibration device and method for obtaining calibration result - Google Patents
Liquid level meter field calibration device and method for obtaining calibration result Download PDFInfo
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- CN115265724A CN115265724A CN202210916642.0A CN202210916642A CN115265724A CN 115265724 A CN115265724 A CN 115265724A CN 202210916642 A CN202210916642 A CN 202210916642A CN 115265724 A CN115265724 A CN 115265724A
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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
Abstract
The invention relates to a liquid level meter on-site calibration device and a method for obtaining a calibration result; the technical problems that in the prior art, in the use process of the liquid level meter, the use environment of the liquid level meter may have different conditions with the laboratory calibration, so that the field measurement data has larger errors, and a special device used in a laboratory is not suitable to be brought to the field for measurement are solved; the calibration device comprises a liquid level control assembly, a standard device and a liquid discharge pipeline; the liquid level control assembly is communicated with the detected liquid level meter; one end of the liquid discharge pipeline is communicated with the lower end of the detected liquid level meter, and the other end of the liquid discharge pipeline is communicated with external equipment; the standard device is communicated with the lower end of the liquid level meter to be detected and is used for realizing the measurement and display of the pressure at the bottom end of the liquid level meter to be detected, the input and display of external information, the calculation and display of the liquid level h of the liquid level meter to be detected and the data zero clearing function; the invention also provides a method for obtaining the calibration result on site.
Description
Technical Field
The invention relates to a liquid level meter calibration device and a method, in particular to a liquid level meter on-site calibration device and a method for obtaining a calibration result.
Background
The existing liquid level meter calibration method is shown in JJG971-2019 liquid level meter calibration regulations, main standard instruments are 1, 2, 3 and 4 items of 7.1.1, wherein 4 items of 7.1.1 are only suitable for a pressure type liquid level meter, other items of 7.1.1 are selected in a matched mode according to actual requirements, and the specific calibration method is introduced in 7.3.
The device and the verification method provided by the JJG971-2019 liquid level meter verification procedure are suitable for a laboratory environment, namely, after a liquid level meter to be used is detached, a special device is used in a laboratory for metrological verification/calibration, but in the using process of the liquid level meter, the using environment of the liquid level meter may have the condition different from that of the laboratory verification/calibration, so that although a measuring instrument is qualified, the accuracy of a final output result is questioned, even a larger error exists, in addition, after the liquid level meter is transported, the error of field measurement data is easily caused, and the special device used in the laboratory is usually large in size, high in cost and not suitable for being brought to a field for measurement. In order to realize the idea of strengthening industrial metering work vigorously in China and ensure the requirement of accurate and reliable final output data of a metering device, the requirement of adopting field/in-situ metering is more urgent.
Disclosure of Invention
The invention aims to solve the technical problems that in the use process of a liquid level meter in the prior art, the use environment of the liquid level meter may have different conditions with the laboratory calibration, the accuracy of an output result is questionable, even larger errors exist in field measurement data, and a special device used in a laboratory is large in size, high in cost and not suitable for being brought to the field for measurement, so that the liquid level meter field calibration device and the method for obtaining the calibration result are provided.
The technical scheme adopted by the invention is as follows:
the field calibration device for the liquid level meter is characterized in that:
the device comprises a liquid level control assembly, a standard device and a liquid drainage pipeline;
the liquid level control assembly is communicated with the detected liquid level meter and is used for injecting liquid into the detected liquid level meter and controlling the liquid level of the detected liquid level meter;
one end of the liquid discharge pipeline is communicated with the lower end of the liquid level meter to be detected, and the other end of the liquid discharge pipeline is communicated with external equipment and used for discharging liquid in the liquid level meter to be detected;
the standard device is communicated with the lower end of the detected liquid level meter and is used for measuring and displaying the pressure applied to the bottom end of the detected liquid level meter, inputting and displaying external information, calculating and displaying the liquid level h of the detected liquid level meter and clearing data, wherein the data comprise pressure, the external information and the liquid level h, the external information comprises liquid density rho and gravity acceleration g, and the calculation formula of the liquid level h is h = p/(rho g).
Further, the standard is a digital pressure gauge;
the digital pressure gauge comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the processor realizes the functions of measuring and displaying pressure, inputting and displaying external information, calculating and displaying the liquid level h of the liquid level gauge to be detected and clearing data when executing the computer program, wherein the data comprises the pressure, the external information and the liquid level h, the external information comprises the liquid density rho and the gravity acceleration g of the location, and the calculation formula of the liquid level h is h = p/(rho g).
Further, the liquid level control assembly comprises a tank body, a first pipeline, a second pipeline and two first stop valves respectively arranged on the first pipeline and the second pipeline;
one end of the first pipeline is communicated with the upper end of the tank body, and the other end of the first pipeline is communicated with the upper end of the detected liquid level meter;
one end of the second pipeline is communicated with the lower end of the tank body, and the other end of the second pipeline is communicated with the lower end of the detected liquid level meter;
liquid is filled in the tank body.
Further, the liquid level control assembly comprises a pressure generator, a third pipeline and a second stop valve arranged on the third pipeline;
one end of the third pipeline is communicated with the lower end of the liquid level meter to be detected, and the other end of the third pipeline is communicated with the pressure generator;
the cavity of the pressure generator is filled with liquid.
Further, a densitometer is included for measuring the density of the liquid in the tank or in the pressure-generating chamber.
Further, the processor can also realize the pressure measuring range usage display function when executing the computer program.
The invention also provides a method for acquiring the calibration result of the liquid level meter on site, which is characterized in that the liquid level meter on-site calibration device comprises the following steps:
step 1: acquiring the density rho of the liquid and the gravity acceleration g of the use area of the liquid level meter to be detected, and inputting the gravity acceleration g and the density rho of the liquid into a standard device;
the measuring range of the detected liquid level meter is divided evenly to obtain i liquid level values, wherein i is larger than or equal to 3, the first liquid level value is 0, and the ith liquid level value is a full-scale value;
and 2, step: data measurement
2.1 injecting liquid into the detected liquid level meter to make the liquid level of the liquid in the detected liquid level meter rise from 0 to full range, recording the height value H measured by the detected liquid level meter at each liquid level point value in the rising process si And the height value h calculated by the standard si ；
2.2 opening the drainage pipeline to reduce the liquid level of the liquid in the detected liquid level meter to 0 from the full range, and recording the height value H measured by the detected liquid level meter at each liquid level value in the reduction process xi And the height value h calculated by the standard xi ；
2.3: repeating the steps 2.1-2.2 at least once to obtain a height value H measured by the detected liquid level meter at each liquid level point value when at least one group of new liquid levels are increased si And the height value h obtained by calculation of the standard si And a height value H measured by the liquid level meter at each level value when the liquid level is lowered xi And the height value h calculated by the standard xi ；
And step 3: based on multiple groups H in step 2 si And h si 、H xi And h xi Calculating the indicating error of each liquid level point value when the liquid level rises and falls during each measurement, and averaging all the indicating errors at each liquid level point value to obtain the average value of the indicating errors at each liquid level point value;
and 4, carrying out uncertainty analysis on the indication error average value of each liquid level point value to obtain the extended uncertainty of each liquid level point value of the detected liquid level meter, wherein the indication error average value and the extended uncertainty of each liquid level point value of the detected liquid level meter are calibration results of the detected liquid level meter.
Further, in step 1, the liquid density ρ is obtained by:
if the liquid is a standard solution, the density rho of the liquid is the density of the standard solution;
and if the liquid is not the standard solution, taking out a certain amount of liquid, and measuring by using a densimeter, wherein the density rho of the liquid is the measured value of the densimeter.
Further, the standard solution is pure water, and the density p is known to be fixed.
The beneficial effects of the invention are:
1. the invention uses the liquid level control component to inject liquid into the liquid level meter and control the liquid level of the liquid level meter, uses the standard device to measure the pressure of the lower end of the liquid level meter when the liquid level of the liquid in the liquid level meter changes, and uses the liquid density and the gravity acceleration of the location to calculate the liquid level of the liquid in the liquid level meter, so it can compare the liquid level measured by the liquid level meter and the accurate standard liquid level obtained by calculation, and obtains the calibration result of the liquid level meter after data processing.
2. The scheme provided by the invention can be used for carrying out the calibration work of the pressure type liquid level meter specified in JJG971-2019 liquid level meter calibration procedures, and simultaneously has the advantages of carrying out the field calibration work of all liquid level meters such as a union type liquid level meter, a buoyancy type liquid level meter, a reflection type liquid level meter, an electrical characteristic type liquid level meter and the like, and has strong universality.
3. In the invention, the digital pressure gauge realizes the input and display of external information, the calculation and display of the liquid level h in the liquid level gauge to be detected and the data zero clearing function, thereby reducing the research and development cost of the whole device and being suitable for large-scale popularization.
Drawings
FIG. 1 is a schematic view of the structure of embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of embodiment 2 of the present invention;
in the figure, 1, a standard; 2. a drainage line; 3. a tank body; 4. a first pipeline; 5. a second pipeline; 6. a pressure generator; 7. a third pipeline; 8. a densitometer; 9. a liquid level meter.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The design idea of the invention is as follows:
because it is inconvenient to use the appointed equipment in the laboratory to calibrate the level gauge 9 on the spot, in order to carry conveniently, design a level gauge on-the-spot calibrating device, through the quantity of the liquid in the control level gauge 9, realize the change of the pressure in the level gauge 9, then calculate the liquid level of the level gauge 9 through formula h = p/(ρ g), then ask processing such as the difference with the liquid level that calculates with the liquid level that the level gauge 9 measures, obtain the calibration result of the level gauge 9.
Based on the above design concept, when calibrating the liquid level meter 9, the calibrator 1 is needed, in the present invention, a modified digital pressure gauge with a high accuracy level (0.05 level and above accuracy level) is selected as the calibrator 1, the digital pressure gauge can perform pressure measurement, but when calculating the liquid level, the liquid density and the gravitational acceleration are also needed, in order to save cost, the present invention can be directly modified on the existing digital pressure gauge with a high accuracy level, that is, a memory, a processor and a computer program stored in the memory and capable of running on the processor are arranged on the digital pressure gauge, the processor implements the functions of pressure measurement and display, external information input and display, calculation and display of the liquid level h in the liquid level meter 9 to be tested, and data zero clearing, wherein the data includes pressure, external information and the liquid level h, the external information includes the liquid density ρ and the gravitational acceleration g of the location, and the calculation formula of the liquid level h is h = p/(ρ g).
In order to ensure that the output of the digital pressure gauge has overload prompt and that the digital pressure gauge is not damaged by overload, the processor also has a pressure range usage display function when executing a computer program.
Example 1:
the invention provides a liquid level meter on-site calibration device, which comprises a liquid level control assembly, a digital pressure meter, a liquid discharge pipeline 2 and a third stop valve arranged on the liquid discharge pipeline 2, wherein the liquid level control assembly is connected with the digital pressure meter;
wherein, the liquid level control subassembly includes jar body 3, first pipeline 4, second pipeline 5 and sets up two first stop valves on first pipeline 4 and second pipeline 5 respectively, and the filling has liquid in jar body 3.
The concrete connection mode of each part is as follows:
the lower extreme and the 5 one end intercommunication of second pipeline of the jar body 3, the other end of second pipeline 5 and the lower extreme intercommunication of the level gauge 9 of being examined, the upper end and the one end intercommunication of first pipeline 4 of the jar body 3, the other end of first pipeline 4 and the upper end intercommunication of the level gauge 9 of being examined, digital pressure gauge passes through the fourth pipeline and communicates with the lower extreme of the level gauge 9 of being examined, be provided with the fourth stop valve on the fourth pipeline, 2 one ends of drain pipe way communicate with the lower extreme of the level gauge 9 of being examined, the other end is connected with external equipment.
If the liquid meets the requirement of environmental safety, the other end of the liquid discharge pipeline 2 can be directly connected with the atmosphere and directly discharged.
If the tank body 3 is filled with standard liquid, such as purified water, the density meter 8 does not need to be carried, and if the tank body is not filled with the standard liquid, the density meter 8 needs to be carried, so that the density of the liquid is measured on site.
The range of the digital pressure gauge is selected in the following mode: according to the liquid level range of the liquid level meter 9 to be detected, the maximum pressure required by the liquid level meter 9 to be detected can be obtained by combining the density rho of the liquid for verification and the field gravity acceleration g through the formula p = rho gh, the pressure is 40% -70% of the full range of the digital pressure gauge, and the uncertainty of the calibration result can be ensured to be small.
The accuracy grade of the digital pressure gauge is selected according to actual requirements, and can be an accuracy grade of 0.05 grade, 0.02 grade or 0.01 grade.
The modified digital pressure gauge traces to the source of the metering standard of the digital pressure gauge before modification, and the accuracy of the pressure output of the modified digital pressure gauge is ensured according to the requirement of the calibration procedure of the digital pressure gauge before modification.
Example 2:
as shown in fig. 2, embodiment 2 differs from embodiment 1 in that: the liquid level control components have different structures;
in this embodiment, the liquid level control assembly includes a pressure generator 6 and a third pipeline 7, one end of the third pipeline 7 is communicated with the lower end of the liquid level meter 9 to be detected, the other end is communicated with the pressure generator 6, and a cavity of the pressure generator 6 is filled with liquid; and a second stop valve is arranged on the third pipeline 7.
Based on the device, the invention also provides a method for obtaining the calibration result on site by the calibration device, which comprises the following steps:
step 1: obtaining the density rho of the liquid and the gravity acceleration g of the area where the liquid level meter 9 to be detected is located, and inputting the gravity acceleration g and the density rho of the liquid into a digital pressure gauge;
if the liquid is a standard solution, such as purified water, the density ρ of the liquid is the density of the standard solution; if the liquid is not the standard solution, taking out a certain amount of liquid, and measuring by using a densimeter 8, wherein the density rho of the liquid is the measured value of the densimeter 8;
selecting the value of the gravity acceleration g in an appendix of the calibration procedure of the piston type pressure gauge, or carrying out field measurement;
the measuring range of the detected liquid level meter 9 is divided equally to obtain i liquid level point values, wherein i is larger than or equal to 3, namely the measuring range is divided equally into at least two equal parts, for example, the measuring range of the liquid level meter 9 with the measuring range of 1m is divided equally into five equal parts to obtain 6 liquid level point values which are respectively 0m, 0.2m, 0.4m, 0.6m, 0.8m and 1m;
step 2: data measurement
2.1 open two first stop valves, liquid in the jar body 3 enters into in being examined level gauge 9, or open second stop valve and pressure creating ware 6, liquid in the pressure creating ware 6 cavity enters into being examined level gauge 9 for the liquid level of liquid in being examined level gauge 9 risees to the full scale from 0, and the record risees the in-process, and every liquid level point value department is examined the liquid levelHeight value H measured by meter 9 si And the height value h calculated by the digital pressure gauge si ；
2.2 opening the third stop valve to reduce the liquid level of the liquid in the liquid level meter 9 to be detected from the full range to 0, and recording the height value H measured by the liquid level meter 9 at each liquid level point value in the reduction process xi And the height value h calculated by the digital pressure gauge xi ；
2.3: repeating the steps 2.1-2.2 once to obtain a new set of height values H measured by the detected liquid level meter 9 at each liquid level point when the liquid level rises si And the height value h obtained by calculation of the digital manometer si And a height value H measured by the liquid level meter 9 at each level point value when the liquid level is lowered xi And the height value h obtained by calculation of the digital manometer xi ；
And 3, step 3: based on two groups H in step 2 si And h si 、H xi And h xi Calculating the indicating error of each liquid level point value when the liquid level rises and falls during each measurement, and averaging all the indicating errors at each liquid level point value to obtain the average value of the indicating errors at each liquid level point value;
step 4, carrying out uncertainty analysis on the indication error average value at each liquid level point value to obtain the extended uncertainty of each liquid level point value of the detected liquid level meter 9, wherein the indication error average value and the extended uncertainty of each liquid level point value of the detected liquid level meter 9 are calibration results of the detected liquid level meter 9, and the extended uncertainty of the detected liquid level meter 9 can also be the maximum value of the extended uncertainties of all the liquid level point values;
and issuing a calibration report according to the calibration result, and selecting the liquid level meter for use according to the calibration report each time.
Claims (9)
1. The utility model provides a level gauge field calibration device which characterized in that:
the device comprises a liquid level control assembly, a standard device (1) and a liquid drainage pipeline (2);
the liquid level control assembly is communicated with the detected liquid level meter (9) and is used for injecting liquid into the detected liquid level meter (9) and controlling the liquid level of the detected liquid level meter (9);
one end of the liquid discharge pipeline (2) is communicated with the lower end of the liquid level meter (9) to be detected, and the other end of the liquid discharge pipeline is communicated with external equipment and used for discharging liquid in the liquid level meter (9) to be detected;
the standard device (1) is communicated with the lower end of the liquid level meter (9) to be detected and is used for measuring and displaying the pressure applied to the bottom end of the liquid level meter (9) to be detected, inputting and displaying external information, calculating and displaying the liquid level h of the liquid level meter (9) to be detected and realizing the data zero clearing function, wherein the data comprises pressure, the external information and the liquid level h, the external information comprises liquid density rho and gravity acceleration g, and the calculation formula of the liquid level h is h = p/(rho g).
2. The in situ calibration device for a liquid level meter of claim 1, wherein:
the standard device (1) is a digital pressure gauge;
the digital pressure gauge comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the processor realizes the functions of measuring and displaying pressure, inputting and displaying external information, calculating and displaying the liquid level h of a liquid level meter (9) to be detected and clearing data when executing the computer program, wherein the data comprises pressure, the external information and the liquid level h, the external information comprises liquid density rho and the gravity acceleration g of the location, and the calculation formula of the liquid level h is h = p/(rho g).
3. The on-site calibration device for the liquid level meter, according to claim 2, is characterized in that:
the liquid level control assembly comprises a tank body (3), a first pipeline (4), a second pipeline (5) and two first stop valves respectively arranged on the first pipeline (4) and the second pipeline (5);
one end of the first pipeline (4) is communicated with the upper end of the tank body (3), and the other end of the first pipeline is communicated with the upper end of the detected liquid level meter (9);
one end of the second pipeline (5) is communicated with the lower end of the tank body (3), and the other end of the second pipeline is communicated with the lower end of the liquid level meter (9) to be detected;
liquid is filled in the tank body (3).
4. The in situ calibration device for a liquid level meter of claim 2, wherein:
the liquid level control assembly comprises a pressure generator (6), a third pipeline (7) and a second stop valve arranged on the third pipeline (7);
one end of the third pipeline (7) is communicated with the lower end of the liquid level meter (9) to be detected, and the other end of the third pipeline is communicated with the pressure generator (6);
the cavity of the pressure generator (6) is filled with liquid.
5. The in-situ calibration device for the liquid level meter according to claim 3 or 4, wherein:
the device also comprises a densimeter (8) for measuring the density of the liquid in the tank (3) or the liquid in the cavity of the pressure generator (6).
6. The on-site calibration device for the liquid level meter, according to claim 5, is characterized in that:
the processor can also realize the pressure range usage display function when executing the computer program.
7. A method for obtaining calibration results on site of a gauge, characterized in that it uses a gauge calibration device on site as claimed in any one of claims 1 to 6, comprising the following steps:
step 1: obtaining the density rho of the liquid and the gravity acceleration g of the use area of the liquid level meter (9) to be detected, and inputting the gravity acceleration g and the density rho of the liquid into the standard device (1);
the measuring range of the detected liquid level meter (9) is divided equally to obtain i liquid level values, wherein i is more than or equal to 3, the first liquid level value is 0, and the ith liquid level value is a full-range value;
and 2, step: data measurement
2.1 injecting liquid into the liquid level meter (9) to be detected, so that the liquid level of the liquid in the liquid level meter (9) to be detected is increased from 0At full scale, recording the height H measured by the liquid level meter (9) at each liquid level point during the lifting process si And the height value h obtained by calculation of the standard device (1) si ；
2.2 opening the liquid discharge pipeline (2) to reduce the liquid level of the liquid in the detected liquid level meter (9) from the full range to 0, and recording the height value H measured by the detected liquid level meter (9) at each liquid level point value in the reduction process xi And the height value h obtained by calculation of the standard device (1) xi ；
2.3 repeating the steps 2.1-2.2 at least once to obtain at least one new set of height values H measured by the liquid level meter (9) at each liquid level point value when the liquid level rises si And the height value h obtained by calculation of the standard device (1) si And a height value H measured by the liquid level meter (9) at each level point value when the liquid level is lowered xi And the height value h obtained by the calculation of the standard device (1) xi ；
And step 3: based on multiple groups H in step 2 si And h si 、H xi And h xi Calculating the indicating error of each liquid level point value when the liquid level rises and falls during each measurement, and calculating the average value of all the indicating errors at each liquid level point value to obtain the average value of the indicating errors at each liquid level point value;
and 4, carrying out uncertainty analysis on the indication error average value of each liquid level point value to obtain the extended uncertainty of each liquid level point value of the detected liquid level meter (9), wherein the indication error average value and the extended uncertainty of each liquid level point value of the detected liquid level meter (9) are the calibration result of the detected liquid level meter (9).
8. The method for obtaining calibration results on site of a liquid level meter according to claim 7, wherein:
in step 1, the liquid density ρ is obtained by:
if the liquid is a standard solution, the density rho of the liquid is the density of the standard solution;
if the liquid is not a standard solution, a certain amount of liquid is taken out and measured by using a densimeter (8), and the density rho of the liquid is the measured value of the densimeter (8).
9. The method for obtaining calibration results on site of a liquid level meter according to claim 8, wherein:
the standard solution is pure water, and the density rho is a known fixed value.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115727929A (en) * | 2023-01-10 | 2023-03-03 | 新创碳谷集团有限公司 | Magnetostrictive sensor calibration method and device |
| CN116164881A (en) * | 2022-12-17 | 2023-05-26 | 廊坊西波尔钻石技术有限公司 | Calibration system and calibration method of barometric instrument |
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2022
- 2022-08-01 CN CN202210916642.0A patent/CN115265724A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116164881A (en) * | 2022-12-17 | 2023-05-26 | 廊坊西波尔钻石技术有限公司 | Calibration system and calibration method of barometric instrument |
| CN115727929A (en) * | 2023-01-10 | 2023-03-03 | 新创碳谷集团有限公司 | Magnetostrictive sensor calibration method and device |
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