The multi parameter water quality monitoring equipment mainly includes pH, conductivity, and water temperature sensors, turbidity sensors, redox, and residual chlorine. Relatively speaking, current automatic water quality monitoring instruments are more suitable for monitoring industrial wastewater discharge, as there is currently no suitable detection instrument to match the biochemical indicators that are more concerned about surface water, such as biological oxygen demand (BOD), chemical oxygen demand (COD), etc. However, with the development of technology and equipment, the application of biochemical indicators in automatic water quality monitoring is not impossible.

One Plan proposal description.

Contemporary water quality monitoring technology is based on molecular structure spectroscopy (photometry), with key methods including online water quality monitoring and on-site water quality monitoring.

(1) Online water quality monitoring has a sampling stage, where qualitative analysis of the composition and composition of a certain chemical substance in the water sample can be carried out based on the spectrum. Quantitative analysis or qualitative research can also be conducted on some physical characteristics of the water body, such as saturation and turbidity. The solution to the water sample usually involves online pretreatment, such as online coloring, extraction, purification, catalytic reactions, etc.

2)

On site water quality monitoring, immediately fix the analyzer based on the spectral analyzer in the rivers or lakes in the detection area, allowing the flowing water to automatically enter the analyzer's circulation system reservoir, and then conduct on-site water sample testing based on the digestion absorption spectral analyzer.

2、 Design scheme regulations for instruments and equipment.

The fundamental laws are the theoretical basis and design standards for spectrometers and water quality monitoring devices. In the design of instrument equipment, it is necessary to consider the standardized working curve diagram, the technical and methodological aspects of handling fundamental laws, and the selection of measurement wavelengths.

2.1 Standardized working curve chart

Generally, using parallel line segments with OD values between 0.2-0.8 on a standardized working curve chart for water quality monitoring can obtain relatively accurate measurement results. The larger the slope of the standard working curve, the higher the sensitivity of the measured substance content detection and the smaller the measurement deviation.

2.2.

Key reasons and preventive measures leading to the violation of Lambert Beer's fundamental law

1) Capable of detecting deviations caused by non visible light and stray light eyes in the broad spectrum spectrometer range.

It is necessary to strictly control the reflection standards during the entire process of organic chemical pretreatment of test samples, such as temperature control, mixing operation, cleaning operation, etc.

2.3 Select the measurement wavelength.

Based on the spectral analysis of parameter samples, selecting larger characteristic digestion absorption wavelengths as measurement wavelengths can improve the sensitivity and accuracy of water quality monitoring. The influence of other components in water samples (such as organic compounds) and turbidity is significant, posing a great risk to the measurement precision of ultraviolet or near ultraviolet stock bands, and is suitable for the visible light range.

3、 Scope of detection.

This experimental platform can test key water parameters such as heavy metal exceedance, permanganate index, ammonium nitrate, permanganate index, chloride ion content, polyphosphate, permanganate index, TOC, COD, etc., and analyze the difficulties that arise during the entire process of spectroscopic instrument inspection.

4、 The overall structure of the measurement and automatic control system.

The system software consists of four key components: potential flow system software, optical electronic system, online sample organic chemistry pretreatment system software, and automatic control system. The system software focuses on a small photometer, which includes a light source, self collimation focus, intelligent inspection room, small photometer, etc. The light from the lighting fixture is self collimated and enters the small intelligent specimen chamber. The light passing through the specimen chamber is focused on the fiber optic probe according to the focal point of the lens, and then coupled to the small spectrometer according to the quartz fiber optic cable. The system structure diagram is shown in Figure 1. This type of optical and electronic system is capable of performing continuous spectroscopy at 190-1000nm with high precision.

Customers only need to present a 12V DC regulated power supply to push commands and obtain data based on the RS485 system bus socket, and complete the basic principle framework diagram of the multi main parameter water quality monitoring plan.

Customers only need to plug in the switch power supply and connect RS485 when applying, and the system software will work normally. Only accept instructions from RS485 and send back the collected data information based on RS485.

The sensor components that combine new technologies in various fields have promoted the development of marine environmental monitoring instruments. There are also many companies on the market dedicated to producing and selling multi parameter water quality monitoring instruments. The components of such monitoring instruments mainly consist of multiple single or multi-functional micro probes, which can monitor parameters such as dissolved oxygen, conductivity, temperature, turbidity, chloride ions, dissolved oxygen, ORP, PH, etc. It can also be customized according to user needs