Introduction to the advantages and disadvantages of differential pressure level gauge/radar level gauge/magnetostrictive level gauge/displacer level gauge/ultrasonic external level gauge

Differential pressure level gauges, radar level gauges, magnetostrictive level gauges, and displacer level gauges are several commonly used level gauges. What are the advantages and disadvantages of these types of level gauges? 1. Differential pressure liquid level gauge double flange (or single flange) differential pressure transmitter works on the principle that when the liquid level in the tank changes, the static pressure generated by the liquid level also changes accordingly. Advantages: good stability, high cost performance, not affected by tank internals. Disadvantages: It needs to be in contact with the medium, which is greatly affected by the density, and there is a hysteresis when the capillary is too long. 2. Radar level gauge The radar level gauge is divided into two types: non-contact radar and guided wave radar. The principle is that the level gauge emits ultra-high frequency electromagnetic pulses to the liquid level (guided wave radar along the steel cable and probe), and then measures The time difference between the transmitted wave and the echo is calculated to calculate the liquid level. Guided wave radar advantages: not affected by temperature, steam, dust, foam, etc. Disadvantages: In contact with the medium, the dielectric constant is required, the steel cable and probe are easy to hang, and the steel cable may fall off. Advantages of non-contact radar: no contact with the medium. Disadvantages: There are requirements for the dielectric constant, it is not suitable for vaporization, with foam media, and there are restrictions on the installation position and flange height. 3. Magnetostrictive and Displacement Level Gauge The principle of the magnetostrictive level gauge is to use the transmitter to send a low-current pulse signal and transmit it down the magnetostrictive line to generate a circular magnetic field. When the magnetic field encounters the floating ball, the The magnetic field in the ball produces a torsional stress pulse, which is received by the receiver, and the liquid level height is calculated according to the time difference between the pulse sending and the receiving. The float level gauge is based on the principle of buoyancy. When the torsion tube is subjected to the torque generated by the float, it turns an angle. The transmitter converts this angle into a 4~20mA signal, which is proportional to the measured liquid level. Advantages: high precision, can be used for short spacing. Disadvantages: contact medium, not suitable for viscous medium, float ball is easy to get stuck, can not be used for small density, high maintenance cost. 4. Ultrasonic external liquid level gauge The ultrasonic external liquid level gauge is attached to the bottom of the window. The sonar wave (ultrasonic wave) is emitted from the probe, and the echo signal is detected by the probe after being reflected by the liquid surface. The echo signal is processed by a proprietary algorithm to calculate the time, and the system calculates the liquid level height according to the formula. It can accurately measure the liquid level of various toxic substances, strong acids, strong alkalis and various pure liquids in high temperature and high pressure airtight containers. The liquid level gauge has no special requirements for the material of the liquid medium and the container, and adopts the explosion-proof design to meet the explosion-proof requirements and can be widely used. Cons: Slightly expensive.

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