Which is the best float level gauge? A brief introduction to float level gauges

Thread Content

　Which is the best float level gauge? A float level gauge is a level measurement instrument that operates on the principle of constant buoyancy as described by Archimedes’ principle. http://www.c*nstrument.com/uploads/191012/1-19101211320H25.jpg Type Magnetic float level gauge A magnetic float level gauge (also known as a magnetic flip level gauge) is an on-site display instrument. Its principle is that when a float equipped with permanent magnets floats on the surface of the liquid being measured, as the liquid level changes, the position of the magnets (i.e., the actual liquid level) also changes. This change triggers the magnetization system to cause the dual-color magnetic flip columns to rotate, thereby indicating the liquid level. It can also output the liquid level in a 4-20 format, features switch alarm functionality, and is capable of withstanding high temperatures and pressures. 　　Float level gauge The float level gauge is an instrument with remote transmission capabilities. Its principle involves the installation of several reed switches at equal intervals along the sensor rod (this interval determines the resolution of the level gauge), along with an equal number of resistors. When the magnetic float rises to a certain position on the liquid surface, the reed switch at that position connects the corresponding resistor representing that position (from at least one to n). The resistance value at the output terminal represents the liquid level at that point. It is then converted by the transmitter into a standard 4-20mA current signal for output. For displaying and adjusting instruments. 　　Magnetostrictive float level gauge The magnetostrictive float level gauge consists of three parts: a probe rod, a circuit unit, and a magnetic float. During measurement, the circuit unit generates a current pulse, which travels downward along the magnetostrictive wire and creates a circular magnetic field. A magnetic float is attached to the outside of the probe rod; this float moves up and down along the probe rod as the liquid level changes. Since the magnetic float contains a set of permanent magnets, it generates a magnetic field as well. When the current magnetic field meets the float’s magnetic field, a “twist” pulse, or “return” pulse, is generated. The time difference between the \"return\" pulse and the current pulse is converted into a pulse signal, thereby allowing the actual position of the float to be calculated; the measured liquid level can also be used to determine the interface between the two liquids. 　　Installation precautions: 1. The level gauge must be installed vertically to ensure that the float assembly can move up and down freely within the main tube. 　　2. Magnetically conductive materials must not be placed near the main body of the level gauge, as this will directly affect its proper operation. 　　3. After the level gauge is installed, it needs to be calibrated using a magnet to adjust the column guide so that the area below the zero mark displays red, while the area above the zero mark displays white. 4. When putting the level gauge into operation, first open the valve of the lower liquid guide pipe to allow the liquid medium to flow into the main tube smoothly, thereby preventing the liquid medium from carrying the float assembly upward rapidly and causing malfunctioning of the column flip mechanism as well as erratic movement of the float. If this occurs, once the liquid level stabilizes, the magnet can be used to recalibrate it. 　　5. To prevent damage to the float assembly during transportation, it is removed from inside the main tube of the level gauge before leaving the factory. After the level gauge is installed, the bottom drain flange is opened, and the float assembly is reinserted into the main tube, making sure that the heavier end of the float assembly faces upward – it must not be installed upside down. If the float assembly has already been installed inside the main tube at the time of manufacturing, in order to prevent damage to it during transportation, we use a soft clip to secure the float assembly within the main tube; during installation, simply remove the soft clip. 　　6. Depending on the conditions of the medium, it is possible to periodically open the drain flange to clean the sediment in the main pipe.