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 Posted: Sat 9:48, 11 Dec 2010 Post subject: ugg italia Chemical materials, trade settlement pi |
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Pipeline trade settlement calculation of chemical materials, the technological transformation of the system
Desalination standard value RTO, where the instrument, respectively, and A, B two-channel conductance measurements. 5. Conductivity measurements of the temperature compensation conductivity measurement is affected by temperature is very serious. Measured solution temperature, the faster the migration of ions, the conductivity increased, the general temperature increase of 1, a 2% increase in electrical conductivity of about 2.5%. Therefore,[link widoczny dla zalogowanych], the conductivity in the laboratory analysis, the solution requires a constant temperature control. In order to test the solution conductivity at different temperatures are comparable, we will AD590 temperature sensor to do together with the conductivity cell electrode,[link widoczny dla zalogowanych], the measured solution temperature is in the range of 0 to 60, measured in aqueous solution with software conductivity of automatic temperature compensation, compensation benchmark is 25. Software solution the following formula for the calculation of temperature compensation: 5.25) where, k (25) is equivalent to 25 when the electrical conductivity; G t, the temperature conductivity; J for the conductivity cell constant; f when the solution for measuring the G temperature; the compensation coefficient, when the general water quality test solution was 0.02. IV Conclusion In this paper, the hardware design ideas, and the error coefficient of the software aspects of alignment and compensation account in the development of our intelligent monitoring device in the conductivity Experience. We give full consideration in the design features of the conductivity measurement,[link widoczny dla zalogowanych], AC excitation source to avoid the polarization conductance pool; use of analog multiplexer switch can detect the signal on the number of AC half-wave rectifier; In order to test the solution conductivity different temperatures are comparable, we use the software method to compensate for the time value to 25; AC excitation source and the AID converter are from the MCU clock frequency of the frequency, simplifying the whole circuit; only a latch circuit to complete the display scan and key input. Can be said is a simple and efficient; give full play to the advantages of intelligent software instrument, the gain coefficient and error compensation values are stored in EPROM in standby, saving hardware costs, but also eliminate the moving parts of the long-term instability. Chemical materials,[link widoczny dla zalogowanych], trade settlement pipeline metering system transformation Dongyan Wei Cai Binxiu (Guangzhou Petrochemical Complex, Guangzhou 510700) (Maoming Petrochemical Ethylene Industry Company, Maoming City, 525021) Abstract Maoming hexene works as storage tank measurement system can not meet the original production business needs of their work, through research, theoretical calculations, instrument selection, construction and installation, testing conditions, and completed the transformation tank measuring system, accurate and reliable system operation. Key words chemical transformation of materials, a measurement system, transformation of the former accounting system is mainly a problem ■ transformation of the former. Measuring the flow of materials out of vinyl sheet and the company level gauge is used during the construction of foreign infrastructure products through the test site conditions. Flow meter and manual inspection feet varied widely, sent to test the above flow test of the department, a serious error tolerance, can not meet the requirements of production and operation, so we embarked on a tank of materials measurement system for technological transformation. Second, pipelines, chemical materials into account the situation of ethylene ■ process used by the company as the main raw material naphtha hydrogenation ~. . . . . . . . . . . . . . . . . . . g. . . . . 200. . . . 2. . . . . N. . . -O-4 oil, light diesel oil and so on, through the refinery's pipeline to ethylene were given away liquid chemical tank (a) of the corresponding storage tank, treatment process after dehydration. Territory to carry out ethylene cracking process. Since styrene,[link widoczny dla zalogowanych], ethylene glycol plant, aromatic plant, MTBE unit to the styrene, ethylene glycol, aromatic raffinate oil, MTBE, respectively, into the liquid chemical tank (b) of the corresponding product tank, the pump out, the styrene, ethylene glycol was sent to the Eastern Harbour water, aromatic raffinate oil, MTBE was sent to the refinery, the material handling process shown in Figure l three main, storage tank meter ■ system is mainly the work of transformation of the actual content for on-site measurement situation, we decided to storage tank 31
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