High-precision sampling method

A high-precision, sample-feeding technology, applied in the analysis of materials, instruments, etc., can solve problems such as poor measurement accuracy

Inactive Publication Date: 2016-12-07
ANHUI WAYEE SCI & TECH CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a high-precision sampling method for an online water quality monitor to solve the problem of poor measurement accuracy in the prior art

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Embodiment Construction

[0017] like figure 1 , the present invention builds an automatic control and data processing module in the online water quality monitor. When the water quality online monitor is sampled, when the sample liquid level is lower than the photoelectric metering position to higher than the photoelectric metering position, the photoelectric receiving signal will have a large amplitude When the liquid level exceeds the photoelectric metering position, the photoelectric receiving signal will no longer change. When the sample liquid level returns to the photoelectric metering position from exceeding the photoelectric metering position, the photoelectric receiving signal also changes.

[0018] like figure 2 , to build an automatic control and data processing module in the water quality online monitor. When the water quality online monitor is sampled, the peristaltic pump draws the sample or reagent to the metering tube. When the liquid level of the sample is lower than the photoelectri...

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Abstract

The invention discloses a high-precision sampling method which samples on the basis of a photoelectric metering mode of a water quality online monitor. The method comprises the following steps: firstly, controlling a sampling liquid level to exceed a photoelectric metering level through the water quality online monitor; controlling the sampling liquid level to slowly return to the photoelectric metering level through the water quality online monitor; presetting a proportion A according to experience and waveform change features of optoelectronic signals when the sampling liquid exceeds the photoelectric metering level and returns to the photoelectric metering level, wherein the proportion A and the liquid level height have a corresponding relationship. According to the method, the fixed position to which the liquid level reaches can be accurately detected and controlled and the purposes of accurately metering and increasing the measuring repeatability can be achieved. The high-precision sampling method has the beneficial effects that the sampling precision of the water-base online monitor can be greatly increased, the measuring accuracy and the measuring repeatability of the water quality online monitor can be increased and the method is fit for the application occasion high in color and turbidity.

Description

technical field [0001] The invention relates to the field of online monitoring of water quality, in particular to a high-precision sampling method. Background technique [0002] The water sample and reagent injection methods of the online water quality monitor are mainly divided into quantitative plunger pump and photoelectric metering. The quantitative plunger pump has high sampling accuracy but high manufacturing and maintenance costs. The photoelectric metering method has low cost and high reliability. Since the photoelectric measurement usually adopts when the photoelectric signal changes when the liquid level reaches the photoelectric measurement position exceeds a set amount, it is recognized as the sample liquid level reaches the photoelectric measurement position. When the color, turbidity or specific gravity of the liquid changes, the photoelectric signal There is no fixed relationship between the change amount and the liquid level position, so the measurement acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N35/10
CPCG01N35/1009G01N2035/1025
Inventor 夏明
Owner ANHUI WAYEE SCI & TECH CO LTD
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