Differences in the industry have different needs, the instrument industry is more complicated market, level gauge is no exception. According to the different needs of the company needs to be manufactured according to different principles, shape and structure, type selection and maintenance methods are not the same. The most common types of level gauge hydrostatic level gauge, magnetic flap level gauge, magnetic float level gauge, magnetostrictive level gauge and ultrasonic level gauge, here to several common level gauge To do a detailed description of the maintenance methods. First, the hydrostatic level gauge liquid column as the hydrostatic pressure is proportional to the liquid level, so the use of pressure gauges to measure the hydrostatic pressure on the reference plane can be measured liquid level. According to the measured medium density and liquid measurement range to calculate the pressure or pressure range, and then select the range, accuracy and other performance suitable pressure gauge or differential pressure gauge. Can be highly sealed, leak-proof and suitable for high temperature, high pressure, corrosion-resistant applications. High temperature, high pressure, toxic, harmful, highly corrosive media even more its superiority. Direct contact with the media, the ball float seal to be strict, can not measure viscous media. Magnetic materials, such as demagnetization easily lead to the level gauge can not work Second, the magnetic flap level gauge in accordance with the principle of buoyancy and magnetic coupling developed. When the liquid level in the container under test is raised and lowered, the magnetic float in the body tube of the liquid level gauge also rises and falls. The permanent magnet in the float passes through the magnetic coupling to the indicator of the magnetic turn-over column to drive the red and white turn- When the liquid level rises, the turning column turns from white to red. When the liquid level drops, the turning column turns from red to white. The red and white interfaces of the indicator are the actual height of the liquid level inside the container, so as to realize the clear liquid level indication. Can be highly sealed, leak-proof and suitable for high temperature, high pressure, corrosion-resistant applications. High temperature, high pressure, toxic, harmful, highly corrosive media even more its superiority. Direct contact with the media, the ball float seal to be strict, can not measure viscous media. Magnetic materials, such as demagnetization can easily lead to liquid level gauge can not work normally flap easily stuck, resulting in no further instructions. Magnetic materials such as demagnetization easily lead to liquid level gauge can not work properly. Electromagnetic Radar Level Gauge (Guided Wave Radar Level Gauge) Radar level gauges use transmit-receive-receive operating modes. Radar level gauge antenna emits electromagnetic waves, these waves by the measured object surface reflection, and then by the antenna to receive electromagnetic waves from the launch to the reception time and the distance from the liquid is proportional to the relationship as follows: D = CT / 2 ( D: Radar level gauge to the liquid level distance C: Light speed T: Electromagnetic wave running time) The radar level gauge records the time that the pulse wave lasts, and the transmission speed of the electromagnetic wave is constant, can calculate the distance from the liquid level to the radar antenna, To know the liquid level. Does not require transmission media, free from the atmosphere, steam, tank fog effects of volatile, volatile liquid can be used for level measurement. Using non-contact measurement, from the tank liquid density, concentration and other physical characteristics. expensive. Instruments need to set the parameters more, if there is a problem, it is usually difficult to find out what is the cause. If the antenna itself accidentally stained with media error. If crystalline icing phenomenon will be reported, need heat insulation, and clean the antenna. The initial installation needs to be short positions, the third empty bit, magnetic float level gauge in accordance with the principle of buoyancy and magnetic coupling developed. When the liquid level in the container under test is raised and lowered, the magnetic float in the body tube of the liquid level gauge also rises and falls. The permanent magnet in the float passes through the magnetic coupling to the indicator of the magnetic turn-over column to drive the red and white turn- When the liquid level rises, the turning column turns from white to red. When the liquid level drops, the turning column turns from red to white. The red and white interfaces of the indicator are the actual height of the liquid level inside the container, so as to realize the clear liquid level indication. Fourth, the magnetostrictive liquid level probe probe upper electronic components generate low-voltage current pulse, start timing, the magnetic field generated along the magnetostrictive line down the float along the level changes along the measurement rod up and down, the float has a magnet, Also produce magnetic field, the two magnetic fields meet, the magnetostrictive wire twists and forms the torsional stress wave pulse, the pulse velocity is known, calculates the pulse propagation time namely the accurate change corresponding to the liquid level. High accuracy. Suitable for oil liquid. Complex installation and maintenance, low market penetration. (Note: pulse principle, there are also suspected shortcomings of the radar level gauge) Fifth, the ultrasonic level meter Ultrasonic level meter is a microprocessor-controlled digital level meter. In the measurement, the pulse ultrasonic wave is emitted by the transducer (transducer), the sound wave is reflected by the surface of the object and received by the same sensor, and converted into an electrical signal. And by the time between the launch and the reception of the sound wave to calculate the distance between the sensor and the measured object. No mechanical moving parts, high reliability, easy to install, convenient, non-contact measurement, and not affected by the viscosity of the liquid, the accuracy of low density, easy to test the blind zone. Pressure vessels can not be measured and volatile media can not be measured. Wide range of popularization, easy calibration, solar water heater agent. Due to the high density and temperature of the medium, the accuracy is often poor, and to eliminate these effects, many other test instruments are required. As a result, a well-established static pressure measurement system is expensive.
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