Points to Be Noted in Electromagnetic Flowmeter Engineering Application

In the petrochemical, chemical, electric power, metallurgy, municipal, pharmaceutical and other industries, the technical difficulty and complexity of flow measurement are quite high. Research on flow measurement plays an important role in improving product quality, reducing business costs, and solving energy conservation and environmental protection. The electromagnetic flowmeter has the advantages of no resistance and no pressure loss, which can fully reduce the resistance in the pipeline and meet the requirements of energy saving and consumption reduction, so the electromagnetic flowmeter has been widely paid attention in the industry. However, although the electromagnetic flowmeter has the above advantages, and it is much better than most other types of flowmeters in reliability and stability, but in actual use, some problems will occur, the following magnetic flow meter factory will list the main points that need to be paid attention to in the application of electromagnetic flowmeter.

1. The transmitter should be installed at a position where the measurement tube can be filled with liquid at any time to prevent the illusion that the pointer is not at zero because of no liquid in the measurement tube. It is best to install it vertically to reduce the error caused by the liquid flowing through the bubble generated on the electrode. If placed horizontally, the two electrodes of the flowmeter must be kept on the same level, in order to prevent sediment or air on the top of the tube to insulate it.

2. If necessary, the tube can be emptied. The built-in empty tube detection circuit will stop the accumulation and flow signal output.

3. For the fluid flowing in the anode-protected pipeline, the following points should be observed when installing the electromagnetic flowmeter: To make the fluid well grounded, a ground ring should be used; when the sensor is connected to the pipeline, there must be insulation between the flanges Insulation sleeves should also be used on the pads and screws.

4. When the electromagnetic flowmeter is installed on the grounded metal pipeline, the system potential balance is achieved through the grounding terminal on the electromagnetic flowmeter transmitter, that is, the copper core wire with a cross-sectional area of not less than 6mm2 is connected to the grounding terminal; When the electromagnetic flowmeter is installed on an ungrounded metal pipe, the two flanges are connected to the pipe flange through a copper core wire with a cross-sectional area of at least 6mm2 and are grounded. Connect the transmitter or sensor junction box to the ground terminal. Achieve system potential balance; when the electromagnetic flowmeter is installed on a plastic pipe or a pipeline with an insulating lining, the system potential balance is achieved through an additional ground ring, which is connected to the ground terminal through a copper core wire with a cross-sectional area of at least 6 mm2.