Liquid level meter is one of the common components of the equipment, today we will understand the liquid level meter together. The types of commonly used level meters are as follows: First, the main principle of the magnetic flip plate level meter: The magnetic flip plate level meter is also called the magnetic flip column level meter, the structure is mainly based on the principle of buoyancy and magnetic design and production of the float with a magnet (referred to as the magnetic float) in the measured medium is affected by the effect of buoyancy. The change of liquid level leads to the change of the position of the magnetic float, and the magnetostatic coupling between the magnetic float and the magnetic turnover column (also known as the magnetic turnover plate) causes the magnetic turnover column to flip at a certain Angle (the surface of the magnetic turnover column is coated with different colors) to reflect the liquid level in the container. The main principle of magnetic float level meter (liquid level switch) : The structure of magnetic float level meter (liquid level switch) is mainly based on the principle of buoyancy and static magnetic field design and production of float ball (referred to as float ball) in the measured medium is affected by the effect of buoyancy: the change of liquid level leads to the change of magnetic float position. The magnet in the float and the sensor (magnetic reed switch) act to change the number of components (such as fixed resistance) of the circuit in series, and then change the electrical quantity of the instrument circuit system. That is, the change in the position of the magnetic float causes a change in the electrical quantity. The liquid level in the container is reflected by detecting the change of electrical quantity. The main principle of explosion-proof float level switch: explosion-proof float level switch, also known as explosion-proof float level controller. Specially designed and manufactured for use in explosive environment liquid level control instrument, this product is based on the principle of buoyancy and lever design when the liquid level in the container changes, the position of the float ball will change with the change of the liquid level, this displacement of the float ball will act on the micro switch through the lever, and then the switch signal will be generated by the micro switch. Four, the working principle and structure of the glass plate liquid level meter: the liquid level meter is designed based on the principle of the glass plate and the liquid path composed of the main body of the liquid level meter is connected with the measured container through the nozzle flange or taper pipe thread to form a communication device, through the glass plate to observe the liquid level and the liquid level in the container is the same, that is, the level height. The needle valve at both ends of the liquid level gauge not only plays the role of a stop valve, but the steel ball inside has the function of a check valve. When the liquid level gauge is accidentally damaged and leaked, the steel ball can automatically close the liquid channel under the action of medium pressure to prevent a large amount of liquid outflow and play a safe maintenance role. The liquid level meter can change the data of the parts or add some auxiliary parts to achieve anti-corrosion, heat preservation, anti-frost, lighting and other functions. Working principle and structure of the glass tube type liquid level meter: The liquid level meter is a liquid path composed of glass tubes designed based on the principle of the communication device. The passage is connected with the measured container through the nozzle flange or taper pipe thread to form a communication device, and the liquid level observed through the glass tube is the same as the liquid level in the container, that is, the liquid level height. The tubular level gauge is mainly composed of glass tubes, maintenance sleeves, upper and lower valves and connecting flanges (or threads). The liquid level meter changes the data of the parts or adds some auxiliary parts to achieve the function of anti-corrosion or heat preservation. Six, the working principle of the steel strip liquid level meter: The steel strip liquid level meter is a traditional liquid level meter. Using the principle of mechanical balance design and production of liquid level detection device, high precision displacement transmission system, constant force device, display device, transmitter device and other peripheral components. The main principle of the heavy weight detection liquid level meter: The heavy weight detection liquid level meter is designed and produced according to the principle of mechanical balance. When the steel strip is submerged and floating in a certain position in the liquid, the gravity of the float, the steel wire rope (or the steel strip) weight and the pointer, the buoyancy of the steel strip by the liquid and the system friction are in balance. Eight, ultrasonic level meter working principle: the working principle of this product: through a can emit energy waves (generally pulse signals) device to emit energy waves, energy waves encountered obstacles reflected by a receiving device to receive the reflected signal. The change of material level is determined according to the time difference of measuring the energy wave movement process. The microwave signal is processed by an electronic device and finally converted into an electrical signal related to the level. Once the probe transmits ultrasonic pulse signal to the surface of the measured medium, the ultrasonic wave is reflected after encountering the measured medium (obstacle) in the transmission process, and the reflected ultrasonic signal is detected by the electronic module and processed by special software. The time difference between transmitting ultrasonic wave and echo can be analyzed, and the distance of ultrasonic wave propagation can be accurately calculated by combining the transmission speed of ultrasonic wave. In turn, it can reflect the situation of the level. Nine, the main principle of intelligent radar level meter: Intelligent radar level meter is a microwave level meter, an application of microwave (radar) positioning technology. The energy wave is transmitted through a device that can transmit energy waves (generally pulse signals), and the energy wave is reflected when it encounters an obstacle, and the reflected signal is received by a receiving device. The change of material level is determined according to the time difference of measuring the energy wave movement process. The microwave signal is processed by an electronic device and finally converted into an electrical signal related to the level. 10, guided wave radar level meter working principle: guided wave radar level meter is a microwave level meter, an application of microwave (radar) positioning technology. The energy wave is transmitted through a device that can transmit energy waves (generally pulse signals), the energy wave is transmitted in the waveguide, the energy wave is reflected when it meets an obstacle, and the reflected energy wave is transmitted by the waveguide to the receiving device, and the receiving device receives the reflected signal. The change of material level is determined according to the time difference of measuring the energy wave movement process. The microwave signal is processed by an electronic device and finally converted into an electrical signal related to the level. 11. Working principle of capacitive level meter: Measurement principle of capacitive level meter, oscillation frequency of oscillation circuit is related to capacitance value, the change of level causes the change of system capacitance, and then changes the oscillation frequency of oscillation circuit. The oscillating circuit in the sensor can convert the capacitance change caused by the change of level into the change of frequency, and send it to the electronic module, and then convert it into the engineering quantity after calculation and analysis, so as to realize the continuous measurement of level. 12, RF admittance level controller working principle: RF admittance level controller is a new level measuring instrument designed and produced by using RF admittance level control technology. Radio frequency admittance measurement technology, simply said is the use of high frequency current measurement system admittance method. Different from capacitance technology, three-terminal technology is adopted in point-position RF admittance technology, which makes the measurement parameters diversified. Radio-frequency admittance technology introduces measurement parameters except capacitance, especially resistance parameters, so that the signal-to-noise ratio of the measurement signal is improved, and the resolution, accuracy and reliability of the instrument are greatly improved. The diversity of measurement parameters also effectively expands the reliable application field of the instrument. The level control technology that makes the product anti-hanging material (the material that the sensor adheres to is called the hanging material) better performance, more reliable work, more accurate measurement and wider applicability. 13, tuning fork level controller working principle: tuning fork level controller is a new type of level switch. The induction rod base of the tuning fork level switch is designed and made by using the principle of tuning fork vibration. The tuning fork rod is driven by piezoelectric wafer, and the vibration signal is received by another piezoelectric wafer, so that the vibration signal is circulated and the induction rod resonates. When the material is in contact with the induction rod, the vibration signal gradually becomes smaller until the resonance stops, and the control circuit will output the electrical contact signal. Due to the natural principle that the sensitivity of the induction rod decreases from the front to the back seat, no error signal will occur when the material in the tank and around the barrel pile up, touch the induction rod base < rear > or discharge material. 14. Working principle of magnetostrictive level meter: Working principle of magnetostrictive level sensor: An initial pulse occurs from the electronic circuit in the electron bin. When the initial pulse is transmitted in the waveguide wire, a rotating magnetic field advancing along the direction of the waveguide wire occurs. When the magnetic field meets the permanent magnetic field in the magnetic ring or float, a magnetostrictive effect occurs, causing the waveguide wire to twist. This twist is sensed by the pickup energy mechanism installed in the electronic bin and converted into the corresponding current pulse, and the time difference between the two pulses can be calculated through the electronic circuit, and the displacement and liquid level can be accurately measured.
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2024 10/25