Measuring principle of motorized float level gauges

Principle. The pontoons immersed in the hidden liquid are subjected to a combination of downward gravity, upward buoyancy and spring spring. When these three forces reach equilibrium, the pontoon is stationary in a certain position.

When the liquid level changes, the buoyancy of the pontoon changes accordingly, and the equilibrium state is broken, which causes the elastic force to change, that is, the expansion and contraction of the spring, to achieve a new equilibrium. The expansion and contraction of the spring allows it to be rigidly connected to the magnet.

Displacements are generated. In this way, the liquid level is indicated by the magnetic sensing element and the actuator in the indicator. Limit switches.

The instrument can realize the alarm function of the liquid level signal.

Based on the displacement measurement principle, the displacement cylinder suspended from the measuring spring is immersed in the measured liquid and subjected to Archimedes.

The upward buoyancy force is proportional to the mass of the liquid discharged. According to the level of liquid, the immersion depth of the cylinder is different, the upward buoyancy changes, and the measuring spring will be extended accordingly to achieve the measurement result of the virtual carrying draft.

Advantages of pontoon level gauges

1. The measurement accuracy is poor and filial piety is high.

2. Intelligent: using HART communication protocol.

The meter provides the user with easy access to information about the operation of the process.

3. High sensitivity: it can respond to small changes in the process.

4. The torsion tube adopts an optimized heat treatment process.

It has excellent temperature and time stability.

5. The structure is sturdy and corrosion-resistant.

6. Wide range of applications and strong applicability.

The pontoon level gauge is a commonly used liquid level measuring instrument, and its working principle is to use the buoyancy of the pontoon and the gravity balance of the measured liquid to judge the liquid level. Specifically, a pontoon level gauge consists of a pontoon and a measuring rod. The pontoons are usually cylindrical, with a closed conical cavity in the upper part and a sealed cylindrical part in the lower part.

The measuring rod is fixed to the barrel wall of the level gauge and has a series of scales on the measuring rod to indicate the level height. When the liquid level rises, the pontoon will be buoyant and will float upward, so that the Xiangchun indicator on the measuring rod points to the corresponding liquid level height. Conversely, when the liquid level drops, the gravity of the pontoon will cause it to sink, and the indicator will point to a lower cavity scale position.

The working principle of the float level gauge: the float floats on the liquid surface according to the principle of discharging the liquid volume phase, etc., when the liquid level of the container changes, the float also moves up and down, changes the position of the liquid level into an electrical signal, and displays the actual position of the liquid with numbers through the display instrument, and the float level gauge achieves long-distance detection and control of the liquid level.

The reed transistor of the float level gauge is magnetically engaged, so that the resistance in the sensor changes linearly, and then the converter converts the change of resistance into a 4mA 20mA standard DC signal output to realize liquid level detection and control.

Fields of application. The float level gauge has the characteristics of simple structure, convenient debugging, good reliability and high precision. The float level gauge can be widely used for continuous measurement of liquid level (boundary) of high temperature, high pressure, viscous, dirty media, asphalt, wax-containing oils, and flammable, explosive, corrosive and other media.

The float level gauge can be used for industrial measurement and control of the liquid level of various liquid tanks such as petroleum, chemical raw material storage, technological process, biochemical, pharmaceutical, food and beverage, tank farm management and underground inventory of gas stations. Float level gauges are also suitable for dam water level, reservoir water level monitoring and sewage treatment, etc.

It is suitable for measuring the level and interface of the liquid medium in the container. In addition to on-site instructions, it can also be equipped with remote transmitters, alarm switches, and detection functions.

Of course it's different, these are two different level gauges.

This is the float level gauge.

The float level gauge is composed of a float, a rod, etc. The float level gauge is installed on the top of the container by connecting the flange, the float floats on the liquid surface according to the principle of discharging the liquid volume phase and so on, when the liquid level of the container changes, the float also moves up and down with it, due to the magnetic effect, the dry spring of the float level gauge is magnetically engaged, the liquid level position changes into an electrical signal, the actual position of the liquid is displayed by the display instrument with numbers, and the float level gauge achieves the long-distance detection and control of the liquid level.

This is the pontoon level gauge.

The float level gauge is a liquid level measuring instrument designed according to Archimedes' law and the principle of magnetic coupling, which can be used to measure the liquid level, boundary level and density, and is responsible for the output of upper and lower limit alarm signals. Designed to measure the liquid level in pressure vessels, it consists of four basic parts: a float, a spring, a magnetic chamber and an indicator.

The float immersed in the liquid is subjected to a combination of downward gravity, upward buoyancy and spring spring. When these three forces reach equilibrium, the pontoon is stationary in a certain position. When the liquid level changes, the buoyancy of the pontoon changes accordingly, and the equilibrium state is broken, which causes the elastic force to change, that is, the expansion and contraction of the spring, so as to achieve a new crack and delay balance.

The expansion and contraction of the spring causes it to displace the magnet that is rigidly attached. In this way, the dengao liquid level is indicated by the magnetic sensing element and the transmission device in the indicator.

1. Classification of magnetic flap level gauges Magnetic flap level gauges are classified according to different standards. 1.According to the degree of corrosion protection, it can be divided into:

Non-corrosive type magnetic flap level gauge, low corrosive type (corrosion-resistant) magnetic flap level pure megameter and high corrosion type (corrosion-resistant) magnetic flap level gauge; 2.According to the installation method, it can be divided into: magnetic flap level gauge can be divided into bottom-mounted magnetic flap level gauge, top-mounted magnetic flap level gauge and side-mounted magnetic flap level gauge; 3.

According to the pressure level, it can be divided into: low-pressure magnetic flap level gauge, medium pressure magnetic flap level gauge, high pressure magnetic flap level gauge; 4.According to whether it has the function of remote transmission, it can be divided into basic magnetic flap level gauge and remote type magnetic flap level gauge.

Second, the use of magnetic flap level gauge, different working conditions have different requirements for magnetic flap level gauge. The MX-WW-144-02 series magnetic flap level gauges are made of 304 and 316L stainless steel, and the pontoons can also be lined with PTFE, PP and PVC, providing excellent reliability and corrosion resistance. At the same time, materials can be selected according to the specific needs of the customer's on-site working conditions to ensure reliability and minimize procurement costs for users.

In order to adapt to the different chemical properties of various liquids to be measured, MX-WW-144-02 series magnetic flip-flop level gauge is divided into standard magnetic flip-flop level gauge, economical magnetic flip-flop level gauge, plastic magnetic flip-flop level gauge and lined magnetic flip-flop level gauge, and their uses are described separately below:1Standard Magnetic Flap Level Gauges Standard Magnetic Flap Level Gauges are made of 316L material and can be used to measure most corrosive liquids.

Mainly used for: (1) industrial wastewater tank level; Phosphoric acid preparation tank level of hydrogen peroxide unit; (3) The liquid level of the ion membrane electrolysis unit, the washing tank and the waste water tank. 2.

The economical magnetic flap level gauge is the biggest feature of the economical magnetic flip-flop level gauge, which can meet the measurement of most working conditions and slightly corrosive liquids, and is mainly used for: (1) the water level of the water tank in the electrolysis workshop; (2) The liquid level of various water storage tanks in industrial plants; (3) The liquid level of the condensate receiving tank and alkali evaporator of the hydrogen peroxide device. 3.

Plastic Magnetic Flap Level Gauge The float of the plastic magnetic flip-flop level gauge is made of high-quality PP or PTFE, which is suitable for measuring low pressure and strong corrosive liquids. It is mainly used for rotation rental: (1) the liquid level of the raw material tank of the printing and dyeing Tongdu factory; (2) the liquid level of the wastewater tank of the sewage treatment plant; (3) The liquid level of the regeneration tank, refrigerant tank, hydrochloric acid tank and alkali tank of the membrane denitrification device in the caustic soda unit.

Xu Mei MX-WW-144-02 Remote Magnetic Flip Level Gauge 4The float lined with magnetic flap level gauge lined with magnetic trigger level gauge is made of 304 lined PTFE, which is mainly used to measure strong corrosive liquids; (1) The liquid level of the ammonia storage tank; (2) The liquid level of the single tank of the PVC production unit; (3) The liquid level of the brine tank, lye circulation tank, dechlorination tower, chlorate decomposition tank and high-purity hydrochloric acid storage tank of the ion membrane electrolysis device.

The float level gauge is a liquid level measuring instrument that works using the variable buoyancy principle in the buoyancy principle (Archimedes' theorem).

In a gravitational field, the perpendicular upward force exerted on an object in a fluid due to the difference in density with the surrounding fluid is buoyant.

In a liquid, the buoyant force experienced by the object is equal to the weight of the liquid dislodged by the object. When the volume of an object immersed in the liquid changes, the buoyancy it experiences changes (variable buoyancy).

When a long float with an equal cross-sectional area is immersed in the liquid vertically, the buoyancy of the float changes linearly with the length of the float immersed in the liquid.

The series of magnetic float level gauges and the measured container form a communicator to ensure that the liquid level between the measured container and the measuring tube is equal. When the float in the measuring tube of the level gauge changes with the measured liquid level, the magnetic body in the float acts with the magnetic body in the color scale displayed on the display bar to flip it, red indicates liquid, white indicates no liquid, so as to achieve the purpose of accurately displaying the liquid level on the spot.

Users can also use magnetron level gauge according to engineering needs, which can be displayed digitally on site, or output a standard telecommunication signal of 4 20mA to meet the needs of recording instruments or industrial process control. It can also be used with a magnetic control switch or proximity switch to monitor the liquid level and alarm or control the liquid inlet and outlet equipment.

The similarity is that they are all measured using buoyancy.

The difference is that the buoyancy of the former remains the same, while the buoyancy of the latter is immersed in the liquid and does not float.