Water quality automatic sampling method and device

Abstract

The invention relates to a water quality automatic sampling method which comprises the following steps: (A1) a control unit receives a sampling command, and controls a sampling pump to acquire a water sample to be detected to a mixing unit; (A2) when the current sampling finishes, a sample feed pump simultaneously outputs the current water sample to two streams, one stream is delivered to an analyzer for analysis, and the other stream is delivered to a sample reservation unit for sample reservation; (A3) the current water sample in the mixing unit is evacuated, and the next sampling process is started; (A4) the analyzer analyzes the current water sample and transmits the analytic result to the control unit for judgment: if the water sample is not satisfactory, the control unit controls the sample reservation unit to reserve the current water sample; if the water sample is satisfactory, the control unit controls the shape feed pump to rotate reversely so as to evacuate the current water sample; and the step (A4) and next water sampling process are performed simultaneously. The invention also relates to a water quality automatic sampling device. The method and device have the advantages of high stability, high reliability and the like, and does not have sampling blind zones besides the mixing unit for sample feed and sample discharge.

Description

technical field [0001] The invention relates to the field of water quality monitoring, in particular to an automatic water quality sampling method and device which adopt a single mixing bucket to realize simultaneous sampling and analysis. Background technique [0002] At present, due to the long interval of water sample collection (usually 1 to 2 hours), the traditional water quality online monitoring system has poor representativeness of water samples, and the response speed is slow to deal with the diffusion of pollutants. When the concentration changes are large, the sampling time is short, which makes the test results of water samples have large deviations and low accuracy. [0003] As a supporting water quality automatic sampler, it is playing an increasingly important role. At present, the traditional water quality automatic sampler is mainly responsible for sampling or retaining samples exceeding the standard. Clean and drain. The new water quality sampler needs to...

AI Technical Summary

Problems solved by technology

[0004] 1. The bottom of the pinch valve is used for drainage and cleaning. In the case of poor water quality, the pinch valve is easy to block, resulting in leakage of water samples, and maintenance is quite troublesome. interference;

[0005] 2. The structure of the liquid discharge nozzle with spring and the sealing ring is used at the same time, which has poor reliability. In the case of sediment impurities, the bottom is likely to be poorly sealed and water leakage occurs.

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