CN113138001B - Sampling method for real-time temperature verification on pipe section - Google Patents
Sampling method for real-time temperature verification on pipe section Download PDFInfo
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- CN113138001B CN113138001B CN202110442125.XA CN202110442125A CN113138001B CN 113138001 B CN113138001 B CN 113138001B CN 202110442125 A CN202110442125 A CN 202110442125A CN 113138001 B CN113138001 B CN 113138001B
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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
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
Abstract
The invention provides a sampling method for detecting temperature on a pipe section in real time, which comprises the following steps: water temperature T under default condition of water meter entering verification mode water ＝T cal (ii) a Recording the current sampling temperature T in real time cal And the first 15 sampled temperatures T cal [15]Calculating the mean temperature T cal_filter Judging the current sampling temperature T cal And mean temperature T cal_filter Whether the absolute value of the deviation is greater than a temperature jump threshold T max (ii) a Continuing to sample and judging the current sampling temperature T cal And mean temperature T cal_filter Whether the absolute value of the deviation is less than a temperature jump threshold T min (ii) a At the moment, the current water temperature T is assigned water For the current sampling temperature T cal . The temperature sensor is used for acquiring the temperature in the pipe section in real time and carrying out real-time verification, so that the sampling temperature and the water temperature are closer, and the flow measurement of the water meter is corrected through the temperature acquired and verified by the temperature sensor, so that the flow performance is more accurate.
Description
Technical Field
The invention relates to the technical field of fluid metering equipment, in particular to a sampling method for detecting temperature on a pipe section in real time.
Background
A water meter is an instrument for measuring water flow and is generally divided into a positive displacement water meter and a speed water meter. Because the water gauge when dispatching from the factory, probably there is systematic error, consequently need examine and determine the water gauge that dispatches from the factory, examine and decide regularly with the water gauge setting on the platform of running water and examine and determine, acquiescence temperature-sensing ware is put and is measured the temperature on the pipeline section, when the water gauge was received the test of running water on the pipeline, the temperature that the temperature-sensing ware tested can be inconsistent with the temperature, and flow measurement will pass through the temperature and revise, and this flow that leads to the test is inaccurate. The method can solve the problem of inaccurate flow performance when the temperature and the water temperature on the pipe section are not matched as much as possible.
Disclosure of Invention
The invention aims to solve the technical problem of inaccurate flow performance of a water meter caused by mismatching of temperature and water temperature on a pipe section.
The invention specifically comprises the following steps: a sampling method for real-time temperature calibration on a pipe section, wherein a temperature sensor and a water meter are arranged on the pipe section, and the sampling method comprises the following steps:
s1, detecting the sampling temperature T by the temperature sensor every 2 seconds in a water meter verification mode cal Water temperature T under default water ＝T cal ；
S2, recording the current sampling temperature T in real time cal And the first 15 times of sampling temperature T cal [15]And by rejecting the highest 2 sampling temperatures T cal [Max]And a minimum of 2 sample temperatures T cal [Min]Post-calculation of mean temperature T cal_filter The formula is as follows: t is a unit of cal_filter ＝((Σ 15 0 T cal [i])-T cal [Max1]-T cal [Max2]-T cal [Min1]-T cal [Min2])/12；
Determining the current sampling temperature T cal And mean temperature T cal_filter Whether the absolute value of the deviation is greater than a temperature jump threshold T max ，T max Defaults to 1.0 ℃;
when Abs (T) cal -T cal_filter )>T max Setting the water meter to enter a verification mode for less than 120 seconds, and assigning the current water temperature T at the moment water ＝T Preset ，T Preset The default value is 20 ℃ for the preset detection temperature value; and step S3 is entered;
when Abs (T cal -T cal_filter )<T max Then, go to step S4;
s3, continuing sampling and judging the current sampling temperature T cal And mean temperature T cal_filter Whether the absolute value of the deviation is less than a temperature jump threshold T min ，T min Defaults to 0.2 ℃;
when Abs (T) cal -T cal_filter )<T min Then, go to step S4;
when Abs (T) cal -T cal_filter )>T min And when the duration is longer than 300 seconds, the step S4 is performed again;
s4, assigning the current water temperature T at the moment water For the current sampling temperature T cal 。
The invention has the following advantages: the temperature in the pipe section is collected in real time through the temperature sensor and is detected in real time, so that the sampling temperature and the water temperature are closer, the flow measurement of the water meter is corrected through the temperature detected by the temperature sensor, and the flow performance is more accurate.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, the invention is a sampling method for real-time temperature calibration on a pipe section, wherein a temperature sensor and a water meter are arranged on the pipe section, and the sampling method comprises the following steps:
s1, detecting the sampling temperature T by the temperature sensor every 2 seconds in a water meter verification mode cal Water temperature T under default condition water ＝T cal ；
S2, recording the current sampling temperature T in real time cal And its first 15 samplingsTemperature T cal [15]And by rejecting the highest 2 sampling temperatures T cal [Max]And a minimum of 2 sample temperatures T cal [Min]Post-calculation of mean temperature T cal_filter The formula is as follows: t is cal_filter ＝((Σ 15 0 T cal [i])-T cal [Max1]-T cal [Max2]-T cal [Min1]-T cal [Min2]) 12; for example, the sampling temperature after the 16 th time is the average temperature of 1-16 times, the sampling temperature after the 17 th time is the average temperature of 2-17 times, and so on.
Determining the current sampling temperature T cal And mean temperature T cal_filter Whether the absolute value of the deviation is greater than a temperature jump threshold T max ，T max Defaults to 1.0 ℃;
when Abs (T) cal -T cal_filter )>T max Setting the water meter to enter a verification mode for less than 120 seconds, and assigning the current water temperature T at the moment water ＝T Preset ，T Preset Defaults to 20 ℃ for the preset verification temperature value, and the flow measurement of the water meter passes the preset verification temperature value T Preset Correcting; and step S3 is entered;
when Abs (T) cal -T cal_filter )<T max Then, go to step S4;
s3, continuing to sample and judging the current sampling temperature T cal And mean temperature T cal_filter Whether the absolute value of the deviation is less than a temperature jump threshold T min ，T min The temperature is determined to be 0.2 ℃ by default,
when Abs (T) cal -T cal_filter )<T min If yes, entering step S4;
when Abs (T) cal -T cal_filter )>T min And when the duration is longer than 300 seconds, the step S4 is performed again;
s4, assigning the current water temperature T at the moment water The current sampling temperature Tcal and the flow measurement of the water meter passes the current sampling temperature T cal And (6) correcting.
The invention collects the temperature in the pipe section in real time through the temperature sensor and carries out real-time verification, so that the temperature on the pipe section is closer to the water temperature, and the flow measurement of the water meter is corrected through the temperature collected and verified by the temperature sensor, so that the flow performance is more accurate.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (1)
1. A sampling method for real-time temperature calibration on a pipe section is provided, wherein a temperature sensor and a water meter are arranged on the pipe section, and the sampling method is characterized in that: the method comprises the following steps:
s1, detecting the sampling temperature T by the temperature sensor every 2 seconds in a water meter verification mode cal Water temperature T under default water ＝T cal ；
S2, recording the current sampling temperature T in real time cal And the first 15 times of sampling temperature T cal [15]And by eliminating the maximum 2 sampled temperatures T cal [Max]And a minimum of 2 sample temperatures T cal [Min]Post-calculation of mean temperature T cal_filter The formula is as follows: t is cal_filter ＝((Σ 15 0 T cal [i])-T cal [Max1]-T cal [Max2]-T cal [Min1]-T cal [Min2])/12；
Determining the current sampling temperature T cal And mean temperature T cal_filter Whether the absolute value of the deviation is greater than a temperature jump threshold T max ，T max Defaults to 1.0 ℃;
when Abs (T) cal -T cal_filter )>T max Setting the water meter to enter a verification mode for less than 120 seconds, and assigning the current water temperature T at the moment water ＝T Preset ，T Preset Setting the temperature value as a preset verification temperature value, defaulting to 20 ℃, and entering step S3;
when Abs (T) cal -T cal_filter )<T max Then, go to step S4;
s3, continuing to sample and judging the current sampling temperature T cal And mean temperature T cal_filter Whether the absolute value of the deviation is less than a temperature jump threshold T min ，T min Defaults to 0.2 ℃;
when Abs (T) cal -T cal_filter )<T min If yes, entering step S4;
when Abs (T) cal -T cal_filter )>T min And when the duration is longer than 300 seconds, the step S4 is carried out again;
s4, assigning the current water temperature T at the moment water For the current sampling temperature T cal The flow measurement of the water meter passes through the current sampling temperature T cal And (6) correcting.
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