Overview of Pipeline Pipeline electromagnetic flowmeter electromagnetic flowmeter to measure the inner tube is a conductive medium volume flow meter based on Faraday induction law of electromagnetic induction, using embedded microcontroller technology, digital excitation, while using CAN live on electromagnetic flowmeter bus, is a national initiative, technology has reached domestic leading level. In addition to the pipeline electromagnetic flowmeter to measure the flow of conductive liquid, it can also measure the liquid-solid two-phase flow, high viscosity fluid and salts, acids, alkalis liquid volume flow. Application Pipeline electromagnetic flowmeter display at the same time meet the site, you can also output 4 ~ 20mA current signal for recording, regulation and control, has been widely used in chemical industry, environmental protection, metallurgy, medicine, papermaking, water supply and drainage and other industrial technology and management department. Features ◆ meter structure is simple, reliable, no moving parts, long working life. ◆ No closure choke parts, there is no pressure loss and fluid clogging. ◆ No mechanical inertia, fast response, good stability, can be used to automatically detect, adjust and program control system. ◆ measure not affect the accuracy of measured media types and temperature, viscosity, density, pressure and other physical parameters. ◆ using different combinations of Teflon or rubber material lining and Hc, Hb, 316L, Ti and other electrode materials can be adapted to the needs of different media. Technical parameters ◆ Meter Accuracy: Pipeline 0.5, 1.0; plug-in 2.5 ◆ Measuring medium: conductivity greater than 5μS / cm in a variety of liquid and liquid-solid two-phase flow. ◆ flow rate range: 0.2 ~ 8m / s ◆ Working pressure: 1.6MPa ◆ Ambient temperature: -40 ℃ ~ + 50 ℃ ◆ medium temperature: PTFE lining ≤180 ℃ rubber material lining ≤65 ℃ ◆ Explosion-proof mark: ExmibdⅡBT4 ◆ Explosion-proof certificate number: GYB01349 ◆ external magnetic interference: ≤400A / m ◆ shell protection: integrated type: IP65; separate type: Sensor IP68 (5 meters underwater, limited to rubber lining) converter IP65 ◆ output signal: 4 ~ 20mA .DC, load resistance 0 ~ 750Ω ◆ communication output: RS485 or CAN bus ◆ Electrical connection: M20 × 1.5 thread, φ10 cable hole ◆ Power supply voltage: 90 ~ 220VAC, 24 ± 10% V.DC ◆ Maximum power consumption: ≤ 10VA instrument selection range to confirm the general industrial use electromagnetic flowmeter measured medium flow rate to 2 ~ 4m / s is appropriate, in exceptional circumstances, the minimum flow rate should not be less than 0.2m / s, the maximum should not exceed 8m / s. If the medium contains solid particles, commonly flow rate should be less than 3m / s, to prevent excessive friction lining and the electrodes; For viscous fluid, the flow rate can select more than 2m / s, the larger the flow rate helps automatically remove the electrodes attached to the stick hysteresis effects thereof, will help improve the measurement accuracy. Q has been determined in the range of conditions to determine the size of the meter diameter D of the velocity V of the above range, the value is calculated by the following formula: Q = πD2V / 4 Q: flow rate (m / h) D: pipe diameter V : velocity (m / h) Range Q electromagnetic flowmeter should be greater than the expected maximum flow rate, and the normal flow values ??are slightly larger than the 50% full scale of the meter is appropriate. Reference flow range caliber (mm) Flow range (m3 / h) diameter (mm) Flow range (m3 / h) φ15 0.06 ~ 6.36 φ450 57.23 ~ 5722.65 φ20 0.11 ~ 11.3 φ500 70.65 ~ 7065.00 φ25 0.18 ~ 17.66 φ600 101.74 ~ 10173.6 φ40 0.45 ~ 45.22 φ700 138.47 ~ 13847.4 φ50 0.71 ~ 70.65 φ800 180.86 ~ 18086.4 φ65 1.19 ~ 119.4 φ900? 228.91 ~ 22890.6 φ80 1.81 ~ 180.86 φ1000? 406.94 ~ 40694.4 φ100 2.83 ~ 282.60 φ1200 553.90 ~ 55389.6 φ150 6.36 ~ 635.85 φ1600 723.46 ~ 72345.6 φ200 11.3 ~ 1130.4 φ1800 915.62 ~ 91562.4 φ250 17.66 ~ 176.25. φ2000 1130.4 ~ 113040.00 φ300 25.43 ~ 2543.40 φ2200 1367.78 ~ 136778.4 φ350 34.62 ~ 3461.85 φ2400 1627.78 ~ 162777.6 φ400 45.22 ~ 4521.6 φ2600 1910.38 ~ 191037.6 installation to use a pipeline electromagnetic flowmeter is based on Faraday's law of electromagnetic induction speed electromagnetic flowmeter. On the basis of the principles set forth on electromagnetic flowmeter, designed based on MSP430F149 MCU LDB-type electromagnetic flow meter, circuit MSP430F149 microcontroller core, thus simplifying the design of peripheral hardware circuit to achieve a liquid flow measurement and accumulation. This paper presents the overall block diagram of the design, some hardware and software flow control. This design LDB-type electromagnetic flowmeter has been put into production, the actual application showed that the design has a high-precision, low power consumption, and reliability, and other characteristics, basically meet the design requirements. 2, can effectively avoid strong electromagnetic flowmeters electrical equipment, high-frequency equipment, strong power switching devices; avoid the impact of high temperature heat and radiation, and avoid strong vibration place and highly corrosive environment, taking into account the ease of installation and maintenance. 3, pipe electromagnetic flowmeter has saved 24 hours a day flow data, outage time, zero flow time and other data and alarm functions. Per day, with a single, short messages can be obtained twice a day 24 hours of measurement data of a measuring point, it can also be set according to user's needs. Upfront investment electromagnetic vortex flowmeter and gsm network combines technology and establish water flow monitoring system only uses radio-third to one-fifth of the way, the operating cost of the system established for each point only once or twice a day the cost of short messages. Eliminating the frequency of use of fees and use of electricity and maintenance costs. 4, flow instrumentation display, communication and data storage is an important part of the instrument. Conventional electromagnetic flowmeter on the display segment generally use LED or LCD, can only display numbers, letters, characters and some rough pattern; in the data storage, information is stored in binary general store, does not have the versatility and storage capacity small; on communication, generally use RS232 or RS485, its openness is not high. 5. Sensors measure the gas flow when installing a vertical pipe, the sensor can be mounted in a vertical pipe, the flow limitation. If the measured gas contains a small amount of liquid, gas flow should be bottom up. When measuring the liquid flow, the liquid flows upwardly by following: the additional weight of the liquid will not be so attached to the probe. 6, side-mounted sensors to measure the level of the pipeline regardless of what kind of fluid, the sensor can be side-mounted on a horizontal pipe, especially the measurement of superheated steam, saturated steam and cryogenic liquids, if conditions allow the best use of side-mounted, so that the temperature of the fluid little effect on the amplifier. 7. Sensor is not recommended in normal circumstances flip horizontal pipe with this installation method. This installation method is not generally used to measure gas, superheated steam. Can be used to measure the saturated steam, suitable for measuring the temperature of liquid or circumstances require regular cleaning of the pipe. 8. When the sensor has insulation layer on the installation of measuring temperature steam piping, insulation layer can not exceed one-third of the height of the bracket. 9. In order to solve the above problems, the use of 32-bit ARM processor and embedded Linux operating system developed electromagnetic flowmeters have the information, graphics and networking. It uses T FT color LCD display, not only can display traffic data can also display the flow curve, improve the quality and content of the display; JFFS2 file using a file system by way of data storage, and storage capacity of up to 1MB.