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Differential pressure level gauges and radar level gauges are two different types of level gauges. Differential pressure level gauges (dp level gauge) measure the difference in pressure between the surface of the liquid and the bottom of the container to determine the liquid level.

Ultrasonic level meters and radar level meters are common level meters, and they can both be used to measure the height of liquids. But they work differently. The sondar ultrasonic level meter uses the time of ultrasonic wave propagation in the medium to measure the liquid level height, while the radar level meter uses the time of microwave propagation in the medium to measure the liquid level height.

Guided wave radar level gauge is used in water and liquid storage tank, acid and alkali storage tank, slurry storage tank, solid particle, small oil storage tank. All kinds of conductive, non-conductive media, corrosive media. Such as coal bunker, ash bin, oil tank, acid tank and so on.

Today, I will explain to you the principle of ultrasonic level meter​, what advantages and disadvantages it has.

The pressure transmitter is mainly composed of pressure sensor, measurement circuit and process connector. The physical pressure parameters such as gas and liquid sensed by the pressure sensor can be converted into standard electrical signals, which are provided to secondary instruments such as alarms, recorders and regulators for measurement, indication and process regulation. In China, the pressure transmitter used in small automation control is generally based on the piezoelectric resistance principle. That is to say, the varistor is compressed, the resistance changes, is amplified with an amplifier, and a standard pressure calibration can be used for pressure measurement.

Radar needs to be considered under the corrosion and adhesion of the medium working condition, in addition to the selection of too long guided wave radar antenna and equipment maintenance is also a need to think about the situation, intelligent radar, high frequency radar level meter can be exchanged, and guided wave radar because the length of the guide rod (cable) depends on the working condition, usually can not be exchanged, affected by this type of guided wave radar must be subject to certain limitations.

Liquid level measurement is an important link in process industry, involving production efficiency, product quality, safety and environmental protection. There are a variety of common liquid level measuring instruments on the market, of which 80GHz radar level meter and external level meter are two more popular non-contact measuring technologies. This paper introduces the working principle, technical characteristics, performance differences and application scenarios of these two instruments, analyzes their advantages and disadvantages and adaptability in different working conditions, and provides a reference basis for users to choose suitable liquid level measuring instruments according to working conditions.

Pressure transmitter is a device that converts pressure into pneumatic signal or electric signal for control and remote transmission. It can convert the physical pressure parameters such as gas and liquid sensed by the pressure measuring element sensor into standard electrical signals to supply secondary instruments such as alarm, recorder and regulator for measurement, indication and process adjustment.

The pressure transmitter calibration work is generally devided into preparation, calibration of conventional differential pressure transmitter and calibration of intelligent differential pressure transmitter.

In everyday life, when we choose something, the first thing we do is to learn about it. The liquid level meter is no exception, before choosing to fully understand it, then understand its working principle is the first step, which is the most basic thing to do. Today, we make a simple science popularization on the measurement principle of several common liquid level meters, including radar level meters.

The choice of temperature sensor is mainly based on the measurement range. When the measurement range is expected to be within the total range, a platinum resistance sensor can be selected. The narrower range usually requires the sensor to have a fairly high basic resistance in order to obtain a sufficiently large resistance change. The large enough resistance variation provided by thermistors makes these sensors ideal for narrow measurement ranges.

The measurement principle of the radar level meter is that the antenna receives the radar pulse reflected signal, and sends the reflected signal to the instrument, the microprocessor of the instrument analyzes the signal, and identifies the actual echo of the radar pulse signal on the surface of the material. When signal interference echoes happenes, what are the reasons for interference echoes?

The radar level antenna transmits a narrow microwave pulse down through the antenna. After the microwave touches the surface of the measured medium, it is reflected back to be received by the antenna system again, and the signal is transmitted to the electronic circuit and automatically converted into the level signal. What are the factors that affect the measurement accuracy of radar level meter?

When the display value of ultrasonic level meter fluctuates, we can use the following methods to figure out the problem.