Electromagnetic flow meter scale from the selection to the whole installation process analysis

Abstract: the electromagnetic flow meter scale analysis the whole process from selection to installation information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Electromagnetic flowmeter is a kind of precision inductive instrument, such as selection or installation is unreasonable, so the measurement accuracy and a large impact on the service life of the instrument. The following selection of electromagnetic flowmeter, installation conditions and use note do simple interface. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electromagnetic flowmeter scale analysis this article details the whole process from selection to installation. Electromagnetic flowmeter is a kind of precision inductive instrument, such as selection or installation is unreasonable, so the measurement accuracy and a large impact on the service life of the instrument. The following selection of electromagnetic flowmeter, installation conditions and use attention to do a simple introduction. （ A) Electromagnetic flowmeter selection principle of the selection of electromagnetic flowmeter, mainly is the correct selection of sensors, the converter can only need to match. 1. Diameter and the choice of range sensor diameter usually choose the same caliber and pipeline system, if the piping system to be design, can choose according to flow range and velocity of caliber. For electromagnetic flowmeter, flow velocity in 2 ~ 4 m/s is appropriate. Under special circumstances, such as liquid containing solid particles, in consideration of the wear, optional common velocity & le; 3 m/s, for easy management of fluid, can choose velocity & ge; 2m/s。 Velocity determine later, can determine the sensor size. Sensor range can choose according to two principles: one is the instrument zui full range is greater than the expected flow quantity; The second is normal flow is greater than 50% of full scale, to ensure the accuracy of measurement of a certain. 2. The choice of temperature and pressure of electromagnetic flowmeter can measure the fluid pressure and temperature is limited, when choosing, using pressure must be less than the flowmeter work pressure. At present, the domestic production of electromagnetic flowmeter work pressure specifications as follows: less than 50 mm diameter, working pressure is 1. 6MPa; 900 mm diameter, working pressure is 1 mpa; More than 1000 mm diameter, working pressure of 0. 6MPa. The working temperature of electromagnetic flowmeter depends on the lining material used, generally for 5 - 70℃。 Such as special processing, can be more than the above range, measured medium temperature sensor allows for - 40 - +130℃。 3. Lining materials and the selection of magnetic material sensors of lining material and electrode material must choose correct according to the physical and chemical properties of medium, otherwise the instrument soon due to the corrosion of the lining and electrode is damaged, but also has a strong corrosive medium once leak likely to cause accidents. Therefore, must according to the specific measuring medium in the process of production, deliberate choice electrode with lining material ( 2) The installation of the electromagnetic flowmeter to insure the accuracy of measurement of electromagnetic flowmeter, it is important to the correct installation. (1) sensors should be installed in the indoor dry ventilated place. Avoid install where the environment temperature is too high, should not be affected by a strong vibration, as far as possible to avoid a strong magnetic field equipment, such as motor, transformer, etc. Avoid installed in place of corrosive gases. Installation site is convenient for maintenance. This is to guarantee normal operation conditions of the sensor. (2) in order to ensure that the sensor tube full of measured medium, transmitter zui vertical installation, good flow from bottom to top. Especially for the liquid-solid two phase six, must be installed vertically. If only allow level field installation, must guarantee that the two electrodes in the same horizontal plane (3) sensors should be installed on both ends and the bypass valve. (4) electromagnetic flow sensor electrode measured by several millivolt ac potential, is based on sensor inner potential. In order to make the fluid potential stability and keep such as a sensor and fluid potential, to ensure the stability of the measurement, the sensor should have a good grounding on both ends of the shell and tube, the converter shell is connected to. Grounding resistance is not greater than 10 & cap; And cannot be Shared with other electrical equipment grounding line. If you can't to ensure good contact sensor shell and metal pipe, metal wires connect them. Reliable grounding. (5) in order to avoid the interference signal, sensors and switches between the signal must use shielding wire transfer. Don't allow the signal cable and power cord steel pipe parallel on the same cable. Signal cable length shall not exceed 30 m 6 converter installation location should avoid, ac and dc magnetic field and vibration environment temperature for - 20 - 50 ℃, does not contain corrosive gas, no rain 80% relative humidity. 7 points in order to avoid the flow relative measurement, the effects of flow control valve should be installed in the downstream of the sensor. For small diameter of the sensor, because from the center of the electrode to import the distance meter has the equivalent of several times the length of a diameter D, so the straight pipe upstream can not do. But for large diameter flowmeter, generally should have more than 5 d straight pipe upstream, downstream straight pipe don't usually do. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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