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Zero drift processing method of ultrasonic water meter

A zero-point drift and processing method technology, which is applied in the direction of measuring devices, instruments, test/calibration volume flow, etc., can solve the problems of non-negligible initial flow of fluctuations and self-propelled water meters, etc., to eliminate external interference and prevent zero-point drift Effect

Pending Publication Date: 2021-01-29
CHONGQING SMART METER GRP CO LTD
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Problems solved by technology

[0003] At present, the range ratio of existing ultrasonic water meters is getting higher and higher, and the accuracy requirements for chips and transducers are also getting higher and higher. However, after the chip cooperates with the transducer, the collected time value always has certain fluctuations, and Some fluctuations cannot be ignored relative to the starting flow. The existing algorithms directly add the measured value to the calculation. In this way, it is very likely that the water meter will have a self-propelled phenomenon within a certain period of time, that is, the so-called zero point drift.

Method used

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  • Zero drift processing method of ultrasonic water meter
  • Zero drift processing method of ultrasonic water meter
  • Zero drift processing method of ultrasonic water meter

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Embodiment 1

[0026] The first step is to give an initial DN25 ultrasonic water meter, make the water meter pipe full of water and keep it in a static state, record the time value collected for 60 seconds, use the drawing software to draw a time curve, and record the number of data N' as 240, which is the number of original measurement time data.

[0027] Step 2: Add all the collected 240 time values ​​and divide by 240 to get the reference value B as 550ps.

[0028] Step 3: Due to the cooperation between the measuring chip and the transducer, the amount of time collected is a randomly fluctuating value. Therefore, according to the drawn change curve of the time value in a static state, and then according to the sampling frequency of the measurement signal, analyze the time value. For the amount of fluctuation, determine the most suitable n value for calculating the number of data, and obtain n=10, which not only ensures the measurement requirements but also meets the interference eliminati...

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Abstract

The invention discloses a zero drift processing method of an ultrasonic water meter, and the ultrasonic water meter mainly comprises a transducer for collecting time and a processor electrically connected with the transducer, wherein the processor is programmed to execute corresponding data processing and logic control. According to the invention, a stable value can be output in case of low flow,and external interference and instability of the water meter can be eliminated in case of zero flow, so zero drift of the water meter is prevented.

Description

technical field [0001] The invention belongs to the technical field of water meters, and in particular relates to a method for processing the zero drift of an ultrasonic water meter. Background technique [0002] Zero drift refers to the self-propelled phenomenon of the ultrasonic water meter after the calibration, due to the ultrasonic water meter itself or other external interference. [0003] At present, the range ratio of existing ultrasonic water meters is getting higher and higher, and the accuracy requirements for chips and transducers are also getting higher and higher. However, after the chip cooperates with the transducer, the collected time value always has certain fluctuations, and Some fluctuations cannot be ignored relative to the starting flow, and the existing algorithms are to directly add the measured value to the calculation, so it is very likely that the water meter will have a self-propelled phenomenon within a certain period of time, that is, the so-cal...

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Application Information

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IPC IPC(8): G01F1/66G01F25/00
CPCG01F1/662G01F1/66G01F25/10
Inventor 彭龙罗哲钱
Owner CHONGQING SMART METER GRP CO LTD