I. Name: Servo Level Gauge Measuring principle: The servo motor drives the float to move downwards. The buoyancy force of the float is changed by the force sensor, and the liquid level is calculated by the rotation angle of the motor at this time. Features: Measurable liquid surface or interface, high precision. Disadvantages: 1. When the viscosity of a liquid with a large viscosity fluctuates greatly, it often happens that the traction filament is pulled off and the floating ball is lost. 2. The detection part is immersed in the liquid to be measured or its saturated vapor. It is not suitable for the measurement of liquids that are self-aggregating, corrosive, toxic, flammable, explosive, high purity, sterile, and high viscosity. 3, hot hole installation. Safety: It is not safe to measure corrosive, toxic, and flammable liquids. Price: High Second, the name: radar level gauge Principle: Radar electromagnetic wave distance measurement principle. Features: Measurable high viscosity liquids and slurries. Disadvantages: 1. The antenna is immersed in the liquid to be measured or its saturated vapor. It is not suitable for the measurement of liquids with pressure, self-aggregation, corrosion, toxic, flammable explosion, high purity, asepsis and high viscosity. 2. Antenna-based radar level gauges measure the level of the pressure vessel. Because the saturated vapors absorb electromagnetic waves, they often have 'lost waves' that do not measure the liquid level and are unstable. 3, hot hole installation. Safety: It is unsafe to measure pressure, corrosion, toxic, and flammable liquids. Price: China. Name: Magnetostrictive Level Gauge Measuring principle: Electromagnetic wave is transmitted from the top of the tank to the magnetic floating ring along the waveguide and reflected back. The liquid level is calculated according to the echo time. Features: high precision. Disadvantages: 1, can measure high viscosity liquids and mud; 2. The antenna is immersed in the liquid to be measured or its saturated vapor. It is not suitable for the measurement of liquids with pressure, self-aggregation, corrosion, toxic, flammable explosion, high purity, asepsis and high viscosity. 3, hot hole installation. Safety: It is unsafe to measure pressure, corrosion, toxic, and flammable liquids. Price: High 4. Name: Capacitance Level Meter, Radio Frequency Admittance Level Meter Measurement principle: The detection rod is inserted into the liquid from the opening at the top of the tank, and the change in the capacitance or admittance of the probe caused by the change in the liquid height is measured to calculate the liquid level. Characteristics: The measured capacitance or admittance is affected by the dielectric coefficient of the liquid, the conductivity coefficient, and the residual liquid attached, resulting in an error. Disadvantages: 1. The full-scale calibration shall be performed on-site and the non-linear error is obvious. 2. It must be immersed in the liquid and it is not suitable for the measurement of liquids with pressure, self-polymerization, corrosion, toxic, flammable explosion, high purity, asepsis and high viscosity. Safety: It is unsafe to measure pressure, corrosion, toxic, and flammable liquids. Price: low V. Name: Ultrasonic level gauge Measuring principle: The liquid level is calculated by measuring the distance from the liquid surface from the opening of the tank top. Features: No contact with liquids, high viscosity liquids and slurries can be measured. Disadvantages: 1, can not measure the pressure vessel; 2. Ultrasonic absorption of vapors and dusts above the liquid level may not measure echoes; 3. The antenna is immersed in the vapor of the liquid to be measured. It is not suitable for the measurement of liquids that are self-aggregating, corrosive, toxic, flammable, explosive, high purity, sterile, and highly viscous. Safety: It is unsafe to measure pressure, corrosion, toxic, and flammable liquids. Price: low VI. Name: Intelligent buoyancy level meter Measuring principle: buoyancy principle Features: Measurable interface and liquid level, intelligent. Disadvantages: Not suitable for measurement of pressure vessels and highly corrosive liquids Safety: It is unsafe to measure pressure, corrosion, toxic, and flammable liquids. Price: High VII. Name: Steel belt level gauge Measuring principle: buoyancy principle. The floating plate moves up and down with the liquid level, and the liquid level is indicated on the dial by the length of the hand of the steel belt. Features: Measurable pressure capacity, more accurate. Disadvantages: The material and installation requirements of the steel strip are very high; in the case of frequent fluctuations in the liquid level, the earrings of the floating disk are guided by the wire rope and the steel strip is broken approximately once a year. Safety: It is unsafe to measure pressure, corrosion, toxic, and flammable liquids. Price: High VIII. Name: Differential Pressure Level Gauge Measuring principle: The difference between the gas pressure at the bottom and the top of the liquid is measured. The pressure difference is equal to the weight of the liquid column. The liquid level is calculated accordingly. Features: High popularity. Disadvantages: 1, vapor phase capillary is easy to plug; 2. Accurately measure the density of the liquid in a timely manner so that the accuracy of the calculated liquid level is low. 3. The ratio of the pressure difference to the base pressure on the pressure vessel is very small, and the pressure variation is a great error. Safety: It is unsafe to measure pressure, corrosion, toxic, and flammable liquids. Price: Low (high damage rate on pressure vessel) Nine, name: magnetic flap level gauge Measuring principle: The magnetic steel of the pontoon in the connecting pipe outside the tank attracts the color indicating small piece of iron outside the connecting pipe to flip and display the liquid level. Features: Intuitive. Disadvantages: 1. After a period of time, the color indicating small iron pieces will appear chaotic; 2. After a certain period of time, the float will be stuck. Safety: It is unsafe to measure pressure, corrosion, toxic, and flammable liquids. Price: medium/high (instrument, connecting tube valve, total maintenance cost) Ten Name: Glass Level Gauge Measuring principle: Using the principle of a connected vessel, the liquid level is directly observed in situ. Features: The most original level gauge. Disadvantages: 1. Labor frequently climbs high ladder records, and labor intensity is high; 2, no remote transmission can not be connected with the automatic control system; 3. After a period of use, the glass plate becomes dirty and unobservable; 4. The glass plate may be broken and cause a major accident. Safety: Very dangerous when measuring pressure, corrosion, toxic, flammable liquids. Price: High (meter, connected pipe valve, escalator, maintenance, labor, total cost of accident) Eleven Name: ELL-FI External Measurement Level Gauge Measuring principle: using micro-vibration analysis. Features: No hole, continuous and accurate measurement outside the tank, it is completely non-contact measurement, there is no limit to the pressure inside the container, can measure flammable, explosive, highly corrosive, highly toxic and high cleanliness, self-aggregation and other media. Easy to install, no need to move, no need to stop production. Safety: the safest Price: Chinese
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August 08, 2019