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In winter, the weather is cold, especially in the northern regions where temperatures are low. As a result, the liquid inside some tanks outside can freeze due to these low temperatures, preventing the liquid from flowing. To prevent the measured medium from freezing at low temperatures and thus making measurement impossible, external heating measures are needed to insulate the pipes of magnetic flap level gauges, thereby keeping the measured medium in a fluid state that can be measured. In practice, vacuum-jacketed magnetic flap level gauges and electrically heated magnetic flap level gauges are commonly used for this purpose. Both are liquid level measuring instruments that are highly suitable for operation in low-temperature conditions. So, what is the difference between an electrically heated magnetic flap level gauge and a vacuum-jacketed magnetic flap level gauge? http://www.jiweimeter.com/uploads/image/20191206/1575619833.jpg I. Electric heating – electric tracing for insulation Electric heating–electric tracing involves using resistive wires wrapped around the main pipeline of the magnetic level gauge to heat the pipeline, thereby keeping the liquid inside at a temperature above the freezing point and preventing the liquid in the tank from freezing due to low temperatures. II. Insulation via Vacuum Jacketing The principle of insulation using a vacuum jacket is the same as that of the insulated bottles we use at home: a vacuum is created outside the main pipeline to prevent heat transfer and convection. This allows for some level of insulation when outdoor temperatures drop at night. The purpose of this insulation is to prevent the temperature inside the tank being measured from dropping too low, thereby avoiding freezing of the liquid being measured, which would make it impossible to take accurate readings. It can be seen that the principles of the above two insulation methods are significantly different. However, in comparison, a vacuum jacket is a more common insulation method. To maintain the vacuum condition in the vacuum jacket, it is necessary to regularly check its vacuum level. After the vacuum jacket magnetic flap level gauge has been in use for a period of time, an increase in the vacuum level indicates that it is necessary to evacuate the vacuum in the jacket again. At this time, a vacuum pump is installed at the vacuum jacket valve; the vacuum pump is used to create a vacuum in the vacuum jacket, thereby ensuring its sealing integrity. This prevents the liquid being tested from freezing due to low temperatures, and thus ensures the accuracy of liquid level monitoring. The above is the introduction to the differences between \"electrically heated magnetic flap level gauges and vacuum-jacketed magnetic flap level gauges\". If you wish to learn more about various level measurement instruments such as level switches (material level switches, liquid level switches) and level gauges (material level gauges, liquid level gauges), feel free to follow the WeChat official account: Jiweimeter. (Article excerpt from: http://www.jiweimeter.com/baikeshow-88-1130-1.html; please cite the source when reproducing it.) ）