A quantitative sampling system

Abstract

The invention discloses a quantitative sampling system, which includes: a multi-way valve, a syringe pump, an electric control assembly, and a solenoid valve assembly; the multi-way valve has a common port and a plurality of distribution ports, and the common port is located at the Different communication channels are formed with different distribution ports under control. The common port of the multi-way valve is connected to the syringe pump, which provides driving power for water samples, reagents, or cleaning fluids. The solenoid valve assembly is connected to the distribution ports to provide Multiple input ports enhance the scalability of the multi-way valve. The invention has a high degree of automation, less consumption of reagents, improved measurement efficiency and accuracy of measurement results, enhanced scalability of the sampling system, and is convenient for measurement personnel to flexibly configure according to the needs of the measurement process, with an economical and effective The method provides a high-precision automatic sampling system with a wide range of applications and strong versatility.

Description

technical field [0001] The invention relates to the technical field of water sample detection instruments, and more specifically relates to a quantitative sampling system. Background technique [0002] Ammonia nitrogen in water as free ammonia (NH +3 ) and ammonium ions (NH +4 ) form exists. When ammonia nitrogen is converted into nitrite and nitrate in water, it consumes dissolved oxygen in water. It is the main oxygen-consuming pollutant in water, and it is also the main form of nitrogen in sewage. In addition, the high content of ammonia nitrogen in the water body will lead to eutrophication of the water body. Therefore, the national environmental protection department lists ammonia nitrogen content as an important monitoring index in water quality testing. [0003] In order to measure the content of ammonia nitrogen in water, my country has formulated the HJ 536-2009 testing standard. The ammonia nitrogen measurement method stipulated in this standard is the salicyli...

AI Technical Summary

Problems solved by technology

But, also there are some defectives in existing automatic sampling device

[0006] First of all, the quantitative accuracy is not high enough, which affects the accuracy of subsequent measurement results;

[0007] Secondly, generally the existing automatic sampling device requires a large number of equipment, its structure is relatively complex, and the maintenance cost is high. At the same time, the complexity of the equipment leads to a long flow path of the liquid in the equipment and a large consumption of reagents. Pipeline blockage is prone to occur, and the operation is cumbersome, which affects the accuracy of the test results;

[0008] Finally, the extensibility of the existing automatic sampling device is not strong, and the types of reagents that can be connected are limited. If the type of reagent needs to be added, the original reagent bottle must be taken out from the sampling port, and then the reagent to be added must be replaced. As a result, the measurement operation is cumbersome, and at the same time, it brings certain limitations to the measurement process.

Images