Two-wire ultrasonic level gauge

Due to the non-contact measurement of the ultrasonic level gauge, the measured medium is almost unlimited, and it can be widely used for measuring the height of various liquids and solid materials, and therefore it is loved by many industrial occasions. Everyone knows that the principle of an ultrasonic level gauge is that the ultrasonic transducer (probe) emits high-frequency pulse sound waves that are reflected on the surface of the measured level (material) and the reflected echoes are received by the transducer and converted into electrical signals. The propagation time of the sound wave is proportional to the distance from the sound wave to the surface of the object. The relationship between the sound wave transmission distance S and the sound speed C and the sound transmission time T can be expressed by the formula: Su003dC×T/2. However, some manufacturers know the principle but I have questions about the second-line ultrasonic level gauge, and I don’t know what the second-line system is. Now let me introduce the classification of ultrasonic level gauge and some applications and installation matters. There is a clearer understanding of the level gauge. Depending on the output signal, the ultrasonic level gauge can adopt two-wire, three-wire or four-wire technology. The two-wire system is: the power supply and the signal output are shared; the three-wire system is: the power supply circuit and the signal output circuit are independent, when the DC 24v power supply is used When using a 3-core cable, the negative end of the power supply and the negative end of the signal output share the same core wire; the four-wire system is: when AC 220v is used for power supply, or when DC 24v is used for power supply, the power supply loop and signal output are required When the circuit is completely isolated, a 4-core cable should be used. DC or AC power supply, with 4~20mADC, high and low switch output. Application areas: water and sewage treatment: pump rooms, collection wells, biochemical reaction tanks, sedimentation tanks, etc. Electric power, mines: mortar tanks, coal slurry tanks, water treatment, etc. Installation principles When ultrasonic level gauges work, high-frequency pulse sound waves are replaced The energy sensor (probe) emits and is reflected on the surface of the object to be measured (water surface), and the returned reflected echo is received by the same transducer (probe) and converted into an electrical signal. The time between pulse sending and receiving (the movement time of the sound wave) is proportional to the distance from the transducer to the surface of the object. The relationship between the distance S of the sound wave transmission and the speed of sound C and the transmission time T can be expressed by the formula: Su003d　CⅩT /2　　 When installing an ultrasonic level meter, the blind area of u200bu200bthe ultrasonic level meter must be considered. When the liquid level enters the blind zone, the ultrasonic transmitter cannot measure the liquid level. Therefore, when determining the range of the ultrasonic level gauge, a margin of 50 cm must be left. When installing, the transmitter probe must be higher than the highest liquid level. It's about 50 cm. Only in this way can the accurate monitoring of the liquid level be ensured and the safety of the ultrasonic liquid level gauge can be ensured.　　In actual use, because of ill-considered installation, the level gauge was submerged by water, causing the level gauge to be completely damaged. Low price, small size and light weight. It can be used for non-contact level measurement of liquid and bulk solids in food, chemical, semiconductor and other industries. It can be used for remote level monitoring and pump control. Note when installing machinery: the installation should be vertical When measuring the surface of the object, avoid using it to measure foamy objects, and avoid installing it where the distance from the surface of the measuring object is less than the blind zone distance (blind zone: each product will have a standard, which is known with the product), and the beam should be considered to avoid blocking substances When encountering the filling mouth and the container wall, when detecting large solid objects, the probe position should be adjusted to reduce the measurement error. Through the above introduction for everyone, I must have already understood what a second-line ultrasonic level gauge is, and what I want to tell you is Although ultrasonic level gauges are suitable for many working conditions, they are not suitable for all working conditions. Some foamy media are not suitable for ultrasonic level gauges. Therefore, you must be correct when purchasing ultrasonic level gauges. Understand your own working conditions, so as to avoid unnecessary troubles caused by inapplicability in the later stage.
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