A practical water company automation instrument selection and management

Abstract: a practical water company automation instrument selection and management of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Abstract: the paper expounds the basic function of automation instrument production in water treatment, the general requirements of the classification and selection of commonly used instrument. Analyses the four kinds of liquid level meter working principle of three kinds of flowmeter, matters needing attention and the applicable scope as well as the selection and turbidity meter. More flow meter manufacturers choose model price quote you are welcome to inquire, here are some water instance article details of automation instrument selection and management. Automation instrument was expounded basic role in the production of water treatment, the general requirements of the classification and selection of commonly used instrument. Analyses the four kinds of liquid level meter working principle of three kinds of flowmeter, matters needing attention and the applicable scope and turbidity instrument selection and matters needing attention. Summarizes the importance of automation instrument in water treatment industry, modern management, professional and technical personnel in the instrument into use and the importance of management control. Key words: automation; Electronic instrument; Water treatment; 1 automation instrument technology management basic role in the production of water treatment in qinhuangdao city a water treatment works, for example: the main technological process and the corresponding basic instrument and automatic control technology. Through electronic instrument for testing the process data, manual or automatic control according to the real-time data, thus coordination between supply and demand, the system between each component, the relationship between the various water treatment processes, so that the water treatment equipment and facilities to get more sufficient and reasonable use. At the same time, as a result of the detection instrument to determine the numerical comparing with set point can be continuous, deviation occurs, immediately adjusted, so as to ensure the quality of water treatment. According to the parameters of the instrument, which can further automatic adjustment and control drug dosing quantity, ensure the reasonable operation of the pump unit, make the management more scientific, achieve the goal of economic operation. Because the instrument has the function of continuous testing, the limit alarm to facilitate processing. 2 municipal water treatment process commonly used instrument classification of municipal water treatment process used in the instrument can be roughly divided into two categories: category belongs to monitor the production process of physical parameters of the instrument, such as test temperature, pressure, liquid level, flow, etc. This kind of instrument used a part of domestic table, its performance and quality can meet the basic requirements. Another kind of testing water quality analysis instruments, such as detection of the turbidity of water, pH value, dissolved oxygen content, conductivity, residual chlorine, SCD value, etc. These special instrument development relatively late in our country, therefore, basic choose imported E + H products, from the practical effect is more economic and reliable. The stand or fall of testing instrument is directly related to the effect of water factory automation, and even the security of water supply. In the water meter design selection, from the performance of the instrument, quality, price, spare parts, such as after-sales service for the repeated comparison, zui after imported instrument and method of combining the domestic instrument. 3 the general requirements of water treatment instrument selection, 1) Accuracy: refer to under the condition of normal use, the accuracy of the instrument measurement results, the smaller the error, the higher the precision. The accuracy of the production process of physical testing instrument for & plusmn; 1%, the accuracy of the water quality analysis instrument for & plusmn; 2%, the accuracy of the high water turbidity meter for & plusmn; 5%. （ 2) Response time: when the measure to be measured, indicating value of the instrument always after a period of time can be displayed, this paragraph of time is the instrument response time. An instrument can reflect parameters change as soon as possible, it is important to index. Requirements for water quality analysis instrument response time should be no more than 3 min. （ 3) Output signals: instrument of analog output should be 4 ma ~ 20 madc signal, load capacity not less than 600 & Omega; 。 （ 4) Instrument protection grade should meet the requirements of the environment, generally should not be less than IP65, used for drug dosing system ability corrosion detection instrument requirements. （ 5) Four wire system of instrument power supply for 220 vac, 50 hz, two wire system of instrument power supply is 24 VDC. （ 6) Field monitoring instrument appropriate chooses digital display instrument. （ 7) Instrument working power supply shall be independent, not share power with computer, to ensure that the power supply when the malfunction and repair each other, make each can run stably and reliably. （ 8) In order to make the computer can detect voltage transformer and current transformer of the abnormal signals and alarm, design matching the input signals of voltage and current transducer should be larger than the current and voltage transformer, namely respectively 0 ~ 6 a and 0 ~ 120 v. （ 9) Should choose can provide reliable service and rich experience of the instrument manufacturer. 4 level meter and the matters needing attention in the selection of model selection should pay attention to the nature of the measured object, such as the physical and chemical properties of measured medium, and the working pressure and temperature, installation conditions, the speed of the liquid level changes, etc. ; With measurement and control requirements, such as measuring range, precision measurement or control, display mode, the instruction, remote indication, and the computer interface, security, anti-corrosion, reliability and convenience of construction.

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