CN112857513A - Measuring error compensation method and device for drop-in type liquid level meter - Google Patents
Measuring error compensation method and device for drop-in type liquid level meter Download PDFInfo
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- CN112857513A CN112857513A CN202110028684.6A CN202110028684A CN112857513A CN 112857513 A CN112857513 A CN 112857513A CN 202110028684 A CN202110028684 A CN 202110028684A CN 112857513 A CN112857513 A CN 112857513A
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- liquid level
- level meter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
Abstract
The invention provides a measuring error compensation method and a device of a drop-in type liquid level meter, which specifically comprise the following steps: acquiring a measured liquid level value of the drop-in type liquid level meter; acquiring pressure values of a first pressure sensor and a second pressure sensor which are respectively positioned above and below a measuring probe at the bottom of the liquid level meter at mounting positions, and respectively calculating liquid height values measured by the two pressure sensors; respectively obtaining the installation heights of the two pressure sensors, and further solving the actual liquid level values corresponding to the liquid height values measured by the two pressure sensors; and respectively subtracting the actual liquid level values measured by the two pressure sensors from the liquid level values measured by the input type liquid level meter, and averaging the two difference values to obtain the actual distance value between the measuring probe of the input type liquid level meter and the bottom of the liquid storage tank. The invention compensates the distance from the measuring probe of the drop-in liquid level meter to the bottom of the liquid storage tank by using the two pressure sensors, effectively improves the measuring accuracy of the drop-in liquid level meter and has very simple and convenient operation.
Description
Technical Field
The invention relates to the technical field of measurement of an input type liquid level meter, in particular to a method and a device for compensating measurement errors of the input type liquid level meter.
Background
The input type liquid level meter is widely applied to the field of liquid storage tank liquid level measurement, and during practical use, due to the fact that sludge, oil slag and other substances are easily deposited at the bottom of the tank, a bottom measuring probe needs to be separated from the bottom of the tank by a certain height during installation so as to prevent impurities from blocking the probe.
Disclosure of Invention
In view of the above, the present invention provides a method and a device for compensating a measurement error of an input level meter, in which two pressure sensors are used to compensate a distance from a measurement probe of the input level meter to a bottom of a liquid storage tank, so that the measurement accuracy of the input level meter is effectively improved, and the operation is very simple.
The invention is realized by adopting the following scheme: a measuring error compensation method for a drop-in liquid level meter specifically comprises the following steps:
acquiring a measured liquid level value of the drop-in type liquid level meter;
acquiring pressure values of a first pressure sensor and a second pressure sensor which are respectively positioned above and below a measuring probe at the bottom of the liquid level meter at mounting positions, and respectively calculating liquid height values measured by the two pressure sensors;
respectively obtaining the installation heights of the two pressure sensors, and further solving the actual liquid level values corresponding to the liquid height values measured by the two pressure sensors;
and respectively subtracting the actual liquid level values measured by the two pressure sensors from the liquid level values measured by the input type liquid level meter, and averaging the two difference values to obtain the actual distance value between the measuring probe of the input type liquid level meter and the bottom of the liquid storage tank.
Further, the method also comprises the following steps: under different liquid levels, actual distance values between the measuring probes of the plurality of input type liquid level meters and the bottom of the liquid storage tank are repeatedly obtained, and the average value of the distance values is used as a measuring error compensation value of the input type liquid level meters.
Further, the liquid height value measured by the pressure sensor is calculated by adopting the following method: acquiring a pressure value P measured by a pressure sensor, and solving a liquid height value h corresponding to the pressure value P according to a formula P ═ ρ gh; where ρ represents the density of the liquid and g is the acceleration of gravity.
Further, the actual liquid level value corresponding to the liquid height value measured by the pressure sensor is obtained by the following method: and adding the liquid height value h measured by the pressure sensor and the installation height h' of the pressure sensor to obtain the actual liquid level value corresponding to the pressure sensor.
The invention also provides a measuring error compensation device of the drop-in liquid level meter, which comprises a liquid storage tank and the drop-in liquid level meter which is arranged in the liquid storage tank and is used for measuring the liquid level in the liquid storage tank, wherein a first pressure sensor and a second pressure sensor are arranged in the liquid storage tank;
the first pressure sensor and the second pressure sensor respectively measure a pressure value, and then liquid height values measured by the two pressure sensors are calculated; according to the installation heights of the two pressure sensors, the actual liquid level value corresponding to the liquid height value measured by the two pressure sensors is further solved; and respectively subtracting the actual liquid level values measured by the two pressure sensors from the liquid level values measured by the input type liquid level meter, and averaging the two difference values to obtain the actual distance value between the measuring probe of the input type liquid level meter and the bottom of the liquid storage tank.
Further, under different liquid levels, actual distance values between the measuring probes of the plurality of input liquid level meters and the bottom of the liquid storage tank are repeatedly obtained, and the average value of the distance values is used as a measuring error compensation value of the input liquid level meters.
Compared with the prior art, the invention has the following beneficial effects: the method provided by the invention can compensate the liquid level measurement error caused by the installation height of the drop-in type liquid level meter by using the two pressure sensors without increasing the opening of the liquid storage tank, thereby improving the measurement accuracy.
Drawings
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of an apparatus according to an embodiment of the present invention.
In the figure, 1 is a first pressure sensor, 2 is a first opening of a liquid storage tank, 3 is a drop-in type liquid level meter, 4 is a liquid storage tank body, 5 is a second opening of the liquid storage tank, 6 is a second pressure sensor, and 7 is a measuring probe of the drop-in type liquid level meter.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1 and fig. 2, the present embodiment provides a method for compensating a measurement error of an immersion type liquid level meter, which specifically includes the following steps:
acquiring a measured liquid level value of the drop-in type liquid level meter;
acquiring pressure values of a first pressure sensor and a second pressure sensor which are respectively positioned above and below a measuring probe at the bottom of the liquid level meter at mounting positions, and respectively calculating liquid height values measured by the two pressure sensors;
respectively obtaining the installation heights of the two pressure sensors, and further solving the actual liquid level values corresponding to the liquid height values measured by the two pressure sensors;
and respectively subtracting the actual liquid level values measured by the two pressure sensors from the liquid level values measured by the input type liquid level meter, and averaging the two difference values to obtain the actual distance value between the measuring probe of the input type liquid level meter and the bottom of the liquid storage tank.
In this embodiment, the method further comprises the steps of: under different liquid levels, actual distance values between the measuring probes of the plurality of input type liquid level meters and the bottom of the liquid storage tank are repeatedly obtained, and the average value of the distance values is used as a measuring error compensation value of the input type liquid level meters.
In this embodiment, the liquid level measured by the pressure sensor is calculated by the following method: acquiring a pressure value P measured by a pressure sensor, and solving a liquid height value h corresponding to the pressure value P according to a formula P ═ ρ gh; where ρ represents the density of the liquid and g is the acceleration of gravity.
In this embodiment, the following method is adopted to determine the actual level value corresponding to the liquid level value measured by the pressure sensor: and adding the liquid height value h measured by the pressure sensor and the installation height h' of the pressure sensor to obtain the actual liquid level value corresponding to the pressure sensor.
The embodiment also provides a measuring error compensation device of the drop-in liquid level meter, which comprises a liquid storage tank and the drop-in liquid level meter which is arranged in the liquid storage tank and used for measuring the liquid level in the liquid storage tank, wherein a first pressure sensor and a second pressure sensor are arranged in the liquid storage tank;
the first pressure sensor and the second pressure sensor respectively measure a pressure value, and then liquid height values measured by the two pressure sensors are calculated; according to the installation heights of the two pressure sensors, the actual liquid level value corresponding to the liquid height value measured by the two pressure sensors is further solved; and respectively subtracting the actual liquid level values measured by the two pressure sensors from the liquid level values measured by the input type liquid level meter, and averaging the two difference values to obtain the actual distance value between the measuring probe of the input type liquid level meter and the bottom of the liquid storage tank.
In this embodiment, under different liquid levels, repeatedly obtain a plurality of input level meter measuring probe and stock solution tank bottom actual distance value, ask a plurality of distance values to get the mean value as input level meter measurement error compensation value.
In particular, this embodiment will be further described with reference to fig. 2 of the specification.
Step 1: acquiring a measured liquid level value of the drop-in type liquid level meter; as shown in fig. 2, the measured level value of the drop-in level gauge is: h is1；
Step 2: acquiring a pressure value 1 of a first pressure sensor which is arranged below the liquid level and is higher than the measuring probe of the liquid level meter, and calculating a liquid height value corresponding to the pressure value 1 according to a formula P ═ ρ gh; as shown in fig. 2, the calculated liquid height values are: h is2；
And step 3: acquiring the installation height value of the first pressure sensor, acquiring a difference value between the actual liquid level value 1 corresponding to the pressure value 1 and the liquid level value of the liquid level meter, and acquiring a distance value 1 between a measuring probe at the bottom of the liquid level meter and the bottom of the liquid storage tank; as shown in fig. 2, the installation height of the first pressure sensor is: h is2'; the pressure value 1 corresponds to the actual liquid level value 1 as follows: h is2+h2'; the distance value between the bottom measuring probe of the liquid level meter and the bottom of the liquid storage tank is as follows: h is2+h2'-h1；
And 4, step 4: acquiring a pressure value 2 of a second pressure sensor which is arranged below the liquid level and is lower than the measuring probe of the liquid level meter, and calculating a liquid height value corresponding to the pressure value 2 according to a formula P ═ ρ gh; as shown in fig. 2, the calculated liquid height values are: h is3；
And 5: acquiring the installation height value of the second pressure sensor, acquiring a difference value between the actual liquid level value 2 corresponding to the pressure value 2 and the liquid level value of the liquid level meter, and acquiring a distance value 2 between a measuring probe at the bottom of the liquid level meter and the bottom of the liquid storage tank; as shown in fig. 2, the installation height of the second pressure sensor is: h is3'; the pressure value 2 corresponds to the actual liquid level value 2 as follows: h is3+h3'; the distance value 2 between the bottom measuring probe of the liquid level meter and the bottom of the storage tank is as follows: h is3+h3'-h1；
Step 6: averaging the distance value 1 and the distance value 2Obtaining the actual distance value between the measuring probe of the liquid level meter under the current liquid level and the bottom of the liquid storage tank; the actual distance value between the measuring probe of the liquid level meter under the liquid level and the bottom of the liquid storage tank is as follows:
and 7: repeating the steps 1 to 6 under different liquid levels to obtain N actual distance values, and averaging the N actual distance values to obtain a measurement error compensation value of the input liquid level meter; the measurement error compensation value of the input liquid level meter is as follows:
the foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (6)
1. A measuring error compensation method of a drop-in type liquid level meter is characterized by comprising the following steps:
acquiring a measured liquid level value of the drop-in type liquid level meter;
acquiring pressure values of a first pressure sensor and a second pressure sensor which are respectively positioned above and below a measuring probe at the bottom of the liquid level meter at mounting positions, and respectively calculating liquid height values measured by the two pressure sensors;
respectively obtaining the installation heights of the two pressure sensors, and further solving the actual liquid level values corresponding to the liquid height values measured by the two pressure sensors;
and respectively subtracting the actual liquid level values measured by the two pressure sensors from the liquid level values measured by the input type liquid level meter, and averaging the two difference values to obtain the actual distance value between the measuring probe of the input type liquid level meter and the bottom of the liquid storage tank.
2. The method for compensating the measurement error of the drop-in liquid level meter according to claim 1, further comprising the steps of: under different liquid levels, actual distance values between the measuring probes of the plurality of input type liquid level meters and the bottom of the liquid storage tank are repeatedly obtained, and the average value of the distance values is used as a measuring error compensation value of the input type liquid level meters.
3. The method for compensating the measurement error of the drop-in liquid level meter according to claim 1, wherein the liquid height value measured by the pressure sensor is calculated by the following method: acquiring a pressure value P measured by a pressure sensor, and solving a liquid height value h corresponding to the pressure value P according to a formula P ═ ρ gh; where ρ represents the density of the liquid and g is the acceleration of gravity.
4. The method for compensating the measurement error of the drop-in type liquid level meter according to claim 1, wherein the actual liquid level value corresponding to the liquid level value measured by the pressure sensor is obtained by the following method: and adding the liquid height value h measured by the pressure sensor and the installation height h' of the pressure sensor to obtain the actual liquid level value corresponding to the pressure sensor.
5. A measuring error compensation device of a drop-in liquid level meter comprises a liquid storage tank and the drop-in liquid level meter which is arranged in the liquid storage tank and used for measuring the liquid level in the liquid storage tank, and is characterized in that a first pressure sensor and a second pressure sensor are arranged in the liquid storage tank, the installation position of the first pressure sensor is higher than a measuring probe of the drop-in liquid level meter, and the installation position of the second pressure sensor is lower than the measuring probe of the drop-in liquid level meter;
the first pressure sensor and the second pressure sensor respectively measure a pressure value, and then liquid height values measured by the two pressure sensors are calculated; according to the installation heights of the two pressure sensors, the actual liquid level value corresponding to the liquid height value measured by the two pressure sensors is further solved; and respectively subtracting the actual liquid level values measured by the two pressure sensors from the liquid level values measured by the input type liquid level meter, and averaging the two difference values to obtain the actual distance value between the measuring probe of the input type liquid level meter and the bottom of the liquid storage tank.
6. The device of claim 5, wherein actual distance values between the plurality of measuring probes of the immersion type level gauge and the bottom of the liquid storage tank are repeatedly obtained at different liquid levels, and the average value of the plurality of distance values is used as the measuring error compensation value of the immersion type level gauge.
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| CN114199313A (en) * | 2021-12-20 | 2022-03-18 | 上海铭控传感技术有限公司 | Input type liquid measuring system and measuring method |
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