Selection of electromagnetic flowmeter

Electromagnetic flowmeter selection In the flow measurement of chilled water, the electromagnetic flowmeter has obvious advantages. The advantages of the electromagnetic flowmeter described in Section 4.2.3 can also be revealed in the flow measurement of chilled water. Among them, the resistance The corrosion problem is especially important for brine chilled water. In high-rise buildings, some air-conditioning water pressure is relatively high. At this time, you can negotiate with the instrument manufacturer to specially manufacture electromagnetic flowmeters that can meet the pressure requirements. In the specific design fashion, the following issues need to be considered. Choice of measuring tube lining. If the frozen water is fresh water, the rubber lining is used, and the price is lower. If the frozen water is salt water, a polytetrafluoroethylene lining must be selected. If both fresh water frozen water and salt water are measured, the PTFE lining must be selected. ! ). The moisture-proof problem of the excitation coil of the electromagnetic flowmeter measuring tube. There are two commonly used methods for sealing the excitation coil in the electromagnetic flow sensor in the shell, one is to use the upper and lower shells, and the sealing strip is pressed tightly with screws to achieve sealing; the other is to use the shell welding sealing method , to isolate the coil from the outside world. The latter is more reliable, and can completely eliminate the breathing phenomenon of the coil cavity and prevent the intrusion of external moisture. However, during the production process, the cavity around the coil is always filled with air, and the water vapor content in it varies with the atmospheric temperature and relative humidity during assembly. If the water vapor content is high, dew condensation is likely to occur due to the temperature drop in the conduit and the cavity after the flowmeter is put into use, causing the coil to be damp and the insulation to be damaged. Therefore, when the chilled water temperature is low (some manufacturers use 0' as the boundary), use nitrogen to replace the air in the cavity, and when the temperature is lower (such as -10' or lower), use Fill with methyl silicone oil (some manufacturers use transformer oil). Different manufacturers have different practices, but the general rule is that the dry medium of the seal will not escape, and the coil insulation will not be reduced in long-term use. Already The inner liner bears negative pressure. When the chilled water flow rate is measured normally, the measuring pipe itself does not bear negative pressure. Negative pressure, as shown in Figure 4.10. Due to the same reason, negative pressure will also appear in the hot water pipe. The negative pressure in the pipe that several linings of Xchi 09X2 company can withstand is listed in Table 4, 3. Therefore, the pipe Once the negative pressure exceeds the specified value, it is possible to cause the lining of the measuring tube to fall off instantly, so it should be avoided. Another way to solve this problem is to choose a lining that can withstand vacuum. This lining is due to the specially designed skeleton To make it able to withstand the pressure of absolute vacuum, its structure is shown in Figure 4.11. Yokogawa and other companies also have such products. Of course, choosing a lining with a skeleton will increase the investment significantly.

Clouds of vortex flow meter manufacturer failures surround the world of digital fork density meter in particular, simply because people don’t pay as much attention to the mass flow meter as they should do.

At the heart of mass flow meter is our Vision to be the global energy company most admired for its people, partnership and performance.

Beijing Sincerity Automatic Equipment Co., Ltd agreed, noting that successful social marketing will become an even more important component of overall marketing strategies, and that marketers will have to think longer, harder and more creatively if they want to be able to fulfill the newly created potential of v shape coriolis mass flow meter.

According to the market analysts, exports from Beijing Sincerity Automatic Equipment Co., Ltd facilities in China will exceed the forecast.