An example of automatic instrument selection and management in a water company

Abstract: The example information of automatic instrument selection and management of a water company is provided by excellent flowmeter and flowmeter production and quotation manufacturers. Abstract: This paper expounds the basic function of automated instruments in water treatment production, the classification of commonly used instruments and the general requirements for matching. The working principles of 4 types of liquid level gauges and 3 types of flowmeters, the precautions and application scope, and the selection and selection of turbidity meters are mainly analyzed. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of an example article on the selection and management of automatic meters in a water company. The paper expounds the basic function of automatic instruments in water treatment production, the classification of commonly used instruments and the general requirements for matching. The working principle, precautions and application scope of 4 types of liquid level meters and 3 types of flowmeters, as well as the selection and precautions of turbidity meters are analyzed. Summarized the importance of automated instruments in the modern management of the water treatment industry, and the importance of professional and technical personnel in instrument use and management control. Keywords: automation; electronic instrument; water treatment; process management 1. The basic role of automation instrumentation in water treatment production Take a water purification plant in Qinhuangdao City as an example: the main process is basically related to the corresponding instrumentation and automatic control technology. The process data is continuously detected by electronic instruments, and manual or automatic control is performed based on these real-time data, so as to coordinate the relationship between supply and demand, between various components of the system, and between various water treatment processes, so as to make water treatment equipment and facilities more efficient. Full and reasonable use. At the same time, since the value measured by the detection instrument can be continuously compared with the set value, when a deviation occurs, it is adjusted immediately to ensure the quality of water treatment. According to the parameters detected by the instrument, it can further automatically adjust and control the dosage of chemicals, ensure the reasonable operation of the pump unit, make the management more scientific, and achieve the purpose of economic operation. Because the instrument has the functions of continuous detection and alarm when exceeding the limit, it is convenient to deal with accidents in time. 2 Classification of instruments commonly used in municipal water treatment processes The instruments used in municipal water treatment processes can be roughly divided into two categories: one is instruments that monitor the physical parameters of the production process, such as detecting temperature, pressure, liquid level, flow, etc. This type of instrument uses a part of the domestic table, and its performance and quality can basically meet the requirements. Another type of analytical instrument for testing water quality, such as testing water turbidity, pH value, dissolved oxygen content, conductivity, residual chlorine, SCD value, etc. The development of these special instruments is relatively late in my country. Therefore, E+H products imported from abroad are basically selected, which is more economical and reliable from the actual effect. The quality of the detection instrument is directly related to the effect of the automation of the water plant, and even the safety of the water supply. In the design and selection of water plant instruments, repeated comparisons were made in terms of instrument performance, quality, price, spare parts, after-sales service, etc., and finally the method of combining imported instruments and domestic instruments was adopted. 3 General requirements for water treatment instrument selection (1) Accuracy: refers to the accuracy of the measurement results of the instrument under normal use conditions. The smaller the error, the higher the accuracy. The accuracy of the physical inspection instrument in the production process is±1%, the accuracy of the water quality analyzer is±2%, the accuracy of the turbidity meter for measuring the height of turbid water is±5%. (2) Response time: When measuring the measurand, the indication value of the instrument will always be displayed after a period of time, which is the response time of the instrument. It is a very important indicator whether a meter can reflect the change of parameters as soon as possible. The response time required for the water quality analyzer should not exceed 3 minutes. (3) Output signal: The analog output of the instrument should be a 4mA ~ 20mADC signal, and the load capacity should not be less than 600Ω. (4) The protection level of the instrument should meet the requirements of the environment where it is located, generally not lower than IP65, and the detection instrument used in the pharmaceutical dosing system should be resistant to corrosion. (5) The power supply of the four-wire system is mostly 220VAC, 50Hz, and the power supply of the two-wire system is 24VDC. (6) On-site monitoring instruments should be digital display instruments. (7) The working power supply of the instrument should be independent, and should not share the power supply with the computer to ensure that the power supply does not interfere with each other during failure and maintenance, so that each can run stably and reliably. (8) In order to enable the computer to detect the abnormal signal of the voltage transformer and the current transformer and give an alarm, the input signal of the designed and selected voltage and current transmitter should be larger than that of the current and voltage transformer, that is, 0~6A respectively. And 0 ~ 120V. (9) Instrument manufacturers who can provide reliable services and have rich experience should be selected. 4 Type selection and precautions of the liquid level gauge When selecting the type, attention should be paid to the properties of the object to be measured, such as the physical and chemical properties of the measured medium, as well as the working pressure and temperature, installation conditions, and the speed of liquid level change; it is also necessary to take into account the measurement and control requirements, such as measurement range, measurement or control accuracy, display mode, on-site indication, remote indication, interface with computer, safety and corrosion resistance, reliability and convenience of construction.

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