Ultrasonic level gauge three-wire system

The editor found that everyone is searching for the term 'three-wire ultrasonic level gauge'. Today, the editor will explain to you the difference between two-wire, three-wire and four-wire ultrasonic level gauges.　　 Two-wire system: The two-wire ultrasonic level meter shares the same circuit for power supply (DC24V only) and signal output (DC4-20mA), and only two wires are needed. It is a standard transmitter form. Three-wire system: The three-wire ultrasonic level meter is actually a four-wire system. Its power supply (only DC24V) and signal output (DC4-20mA) loops are separated, and two wires are used for each. When their negative ends are connected to the common ground, they are usually used Three lines are enough. Its advantage is that the transmission power is relatively large.　　 Four-wire system: The power supply (DC24V or AC220V) and the signal output (DC4-20mA) loop are separated, and two wires are used each. Its advantage is that the transmission power is large, and it provides high and low relay outputs at the same time, adding new functions. In addition to the problem of the output line, the editor also organized the common problems of ultrasonic level gauges for everyone: 　　1. Entering the blind zone: The ultrasonic level gauge will have a blind zone. Once the liquid level enters the range of the blind zone, the display will show the full scale or Arbitrary data. Generally, the blind zone of 5 meters range is 0.3-0.4 meters, and the blind zone of 10 meters range is 0.4-0.5 meters. As long as we consider the blind zone range of the ultrasonic level gauge when installing, try to make the installation height beyond the blind zone, and it can be easily solved. This question.　　 2. Stirring in the container: Stirring is a process that occurs in many industrial sites, but it has become a big problem for major factories to accurately measure the liquid level during the stirring process. If you choose an input type level gauge, you will worry about the lead wire being caught by the stirrer. If you use an ultrasonic level gauge, the measurement will be inaccurate due to the drastic change of the liquid level. In fact, it can be easily solved by adding a wave guide tube or using a large-range ultrasonic level gauge in the installation, and there will be no signal or severe data fluctuation.　　3. There is foam on the surface of the liquid: This common problem is caused by the measuring principle of the ultrasonic level gauge. When bubbles appear on the surface of the measuring liquid, or the volatility of the liquid, it will cause the display to lose waves or keep searching. This is similar to the principle that it cannot be measured during stirring. It can also be solved by using a still-wave tube or using a large-range ultrasonic level gauge. 4. There is electromagnetic interference on site: This problem is not caused by the product itself. When electromagnetic interference exists on site, many meters will have irregular data fluctuations. When the electromagnetic interference is too strong, there will even be no signal. . Although this problem is not a product problem, it can also be solved by optimizing the product. We can overcome the influence of electromagnetic interference by grounding the product, keeping away from the interference source or shielding, etc.　　5. The temperature of the tank is high: When the measured liquid level temperature is too high, and the ultrasonic level gauge probe is very close to the liquid level, a series of problems will occur. At this time, we need to replace a large range of meters, or choose probes made of PTFE or PVDF to overcome the influence of temperature on the meters.　　 In fact, we often encounter various problems in the industrial field. The editor here just sorted out a common and representative problem. If you encounter problems that cannot be solved at the industrial site, you can ask some professional instrument manufacturers for help. Kaidi Sensing Technology Co., Ltd. is a professional instrument manufacturer that has been established for 12 years. The internal professional Ru0026D team has been committed to improving product performance for many years. Professional technical engineers with rich on-site experience, you can solve any problems on site.

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