What is the principle of float level gauge? What types are included

The float level gauge is a liquid level measuring instrument that works on the principle of constant buoyancy. So what is the principle of the float level gauge? What types are included? Principle In the gravitational field, the vertical upward force on the object in the fluid due to the density difference with the surrounding fluid is the buoyancy force. Objects in a liquid whose overall density is lower than that of the liquid will eventually float on the surface of the liquid, and this object may be called a float. The buoyant force on the float is constant (constant buoyancy) under the condition that the conditions remain unchanged. When the float is subjected to an upward force that is less than its own weight or a downward force that is less than the weight of the liquid equal to its own volume, the characteristic that the float will eventually float on the surface of the liquid is not altered. In steady state, the buoyant force on the float is constant. When the liquid surface position changes vertically, the vertical position of the float will change synchronously with the liquid surface position under the action of constant buoyancy. Through various mechanical, electromagnetic, optical and other physical means, the vertical position of the float is displayed in a form that can be directly read by people, which is the float level gauge. Structural form 1. Balanced type uses pulleys and rigging to connect a balance force outside the container, such as a counterweight or a spring, with a float inside the container. When the float moves up and down with the liquid level, it drives the rigging, pulley or counterweight or mainspring to move together, and the liquid level is read outside the container by detecting the displacement or rotation in this movement. This type of level gauge is widely used in large storage tanks. Commonly used are: float level gauge, steel belt level gauge, etc. 2. Set a lever and set the fulcrum on the wall of the container, fix the float on the end of the lever located inside the container, when the float moves up and down with the liquid level, it drives the other end of the lever located outside the container to move, or drives the fulcrum to rotate , by detecting the displacement or angle of rotation in this movement, the liquid level can be read outside the container. This type of liquid level gauge is often used on mobile containers or made into liquid level switches due to its strong resistance to external force and high reliability due to its structural characteristics. Common ones are: marine level gauge, float switch, etc. 3. The connecting rod type is equipped with a connecting rod on the upper part of the floating ball. When the floating ball moves up and down, it drives the connecting rod to move up and down synchronously, and the liquid level is read out on the upper end of the connecting rod. This type of liquid level gauge is suitable for liquid level measurement when the liquid level is lower than the operating height of personnel (such as underground pools). 4. In the guide rod type, the float is made into a ring and sleeved on a guide rod, and the float moves up and down along the guide rod with the change of the liquid level. A permanent magnetic object is placed inside the float, and a magneto-sensitive element is placed inside the guide rod, and the position of the float is detected by the magneto-sensitive element and converted into an electrical signal corresponding to the level of the liquid level for output. This type of liquid level gauge performs better when the medium in the container moves violently, and has the characteristics of simple structure when only the remote signal is required and the on-site liquid level scale type indication is not required. At the same time, it is the most commonly used type of 'float level gauge' in naming. 5. In the connecting pipe type, a vertical pipe is set on the outside of the container, and the upper and lower pipes are connected to the container. According to the principle of the connecting pipe, when there is liquid in the container, the liquid will enter the vertical pipe and be at the same height as the liquid level in the container. At this time, a float is built in the pipeline, and the position of the float can reflect the liquid level in the container. This type of level gauge is not affected by the horizontal movement of the liquid in the container because the float is arranged outside the container. Therefore, it has better adaptability and can achieve higher measurement accuracy in more application environments. Type 1. Magnetic float level gauge (magnetic flap level gauge) Magnetic float level gauge (also known as magnetic flap level gauge) is an on-site display instrument. When the medium surface is changed, the position of the magnetic steel (that is, the actual liquid level position) changes with the change of the liquid level, and the two-color magnetic flip column is driven to flip through the coupling of the magnetization system, so as to display the liquid level position. At the same time, it can output liquid level of 4-20, and has switch alarm function, which can withstand high temperature and high pressure. 2. Float float level gauge The float level gauge is an instrument with remote transmission function. The principle is that several reed switches are installed at equal distances in the sensor guide rod (this distance is the resolution of the level gauge). ) and an equal number of equivalent resistors. When the magnetic levitation ball floats to a certain position with the liquid level, the reed switch at this position turns on the corresponding resistance (at least one to n) representing this position. The resistance value at the output represents the liquid level at that point. Then the transmitter becomes the standard current signal output of 4-20mA. For display and adjustment of instruments. 3. Magnetostrictive float level gauge The magnetostrictive float level gauge consists of three parts: the detection rod, the circuit unit and the magnetic float. During measurement, the circuit unit generates a current pulse that travels down the magnetostrictive wire and generates a ring-shaped magnetic field. There is a magnetic float outside the detection rod, and the magnetic float moves up and down along the detection rod with the change of the liquid level. Since a set of permanent magnets are installed in the magnetic float, the float generates a magnetic field at the same time. When the current magnetic field meets the float magnetic field,Generates a 'twist' pulse, or 'return' pulse. The time difference between the 'return' pulse and the current pulse is converted into a pulse signal, so as to calculate the actual position of the float, and the measured liquid level can also measure the interface of the two liquids. Installation precautions 1. The liquid level gauge must be installed vertically to ensure that the float assembly can move freely up and down in the main pipe. 2. It is not allowed to have a magnet near the main body of the liquid level gauge, otherwise it will directly affect the correct operation of the liquid level gauge. 3. After the liquid level gauge is installed, it needs to be calibrated with magnetic steel to guide the flip column once so that it will display red below the zero position and white above the zero position.
customized level indicator level gauge is liked by everyone and is used in every household.
As a result, consumers will reward KAIDI with leadership sales, profit, and value creation, allowing our customers in which we live and work to prosper.
Guangdong Kaidi Energy Technology Co., Ltd. constantly discovers the demands of global market for developing a wide range of products applied in different use.
Guangdong Kaidi Energy Technology Co., Ltd. is a team of manufacturers who have 10+ year experience on creating business plans and other types of productions with top-tier management firms and various multinational corporates.