The ultrasonic level gauge is installed on the upper part of the container. Under the control of the electronic unit, the ultrasonic level gauge probe emits a bunch of ultrasonic pulses to the measured object. The sound wave is reflected by the surface of the object, and part of the reflected echo is received by the probe and converted into an electrical signal. From the time when the ultrasonic wave is transmitted to when it is received again, the time is proportional to the distance between the probe and the object to be measured. The electronic unit detects this time and calculates the measured distance based on the known speed of sound. The level value can be obtained by subtraction operation. Because temperature has an effect on the speed of sound, the meter should measure the temperature to correct the speed of sound.Technical Q&A:(1) What kind of application environment is the ultrasonic level meter suitable for?It is usually used to measure liquid level or material level in places where the temperature is between -40°C and 100°C and the pressure is below 3Bar (5kg/cm2).In the case of normal temperature and normal pressure, it is the best choice to choose an ultrasonic level meter to measure the liquid level. It has the characteristics of reliable work, easy installation, long service life, maintenance-free, and relatively price advantage.(2) What should be paid attention to when measuring the level of volatile liquids in closed containers?Two points should be noted:a The speed of sound of the gas in the container may be different from the speed of sound in the air. If the level gauge cannot correct the speed of sound, a certain error will occur; b Volatile liquid will condense on the surface of the ultrasonic level gauge probe, blocking the transmission and reception of sound waves. The level gauge is required to have a variable power control function. (3) How effective is the ultrasonic level meter for solid material level? It is feasible to use an ultrasonic level meter for level measurement, and there is enough application experience and successful examples. When measuring the material level, the installation position should be selected, and the material surface should be relatively flat; for the powdered material level, a level meter with a larger power (range) can be selected for measurement. (4) For liquids with violent liquid level fluctuations, how to use an ultrasonic level gauge to measure the liquid level?There are three feasible methods: a select an ultrasonic level gauge with automatic power control function b select a larger range ultrasonic level gauge c add a plastic tube to the liquid to measure the liquid level in the plastic tube (5) two-wire ultrasonic level What is the difference between a three-wire ultrasonic level meter and a three-wire ultrasonic level meter?The power supply (DC24v) and signal output (DC4-20mA) of the two-wire ultrasonic level meter share the same circuit. Only two wires are needed. It is a standard transmitter form. The disadvantage is that the transmit power is relatively weak. .The three-wire ultrasonic level meter is actually a four-wire system. Its power supply (DC24v) and signal output (DC4-20mA) circuits are separated, and two wires are used for each. When their negative ends are connected to the common ground, three wires are usually used. . Its advantage is that the transmission power is relatively large.
Post time: 21-09-21