The difference and working principle of level switch and level gauge

What is the difference between a level switch and a level gauge? How do level switches and level gauges work? A sensor is a detection device that can convert the measured information into electrical signals or other required forms of information output to meet the requirements of information transmission, processing, storage, display, recording and control. The new sensor has the characteristics of miniaturization, digitization, intelligence, multi-function, systematization and networking. It is the first link to realize automatic detection and automatic control. Generally, according to the basic sensing function of sensing, it is divided into ten major components, such as thermal elements, photosensitive elements, gas-sensitive elements, force-sensitive elements, magnetic-sensitive elements, humidity-sensitive elements, sound-sensitive elements, radiation-sensitive elements, color-sensitive elements and taste-sensitive elements. kind. The existing liquid level measurement methods include photoelectric, ultrasonic, and radar measuring instruments. Liquid level sensors have now become essential instruments in petrochemical, metallurgy, electric power, pharmaceutical, water supply and drainage, environmental protection and other fields, and play an important role in the industrial field. Level is the height of the liquid in the container. In daily life and industrial production and operation, it is necessary to know the liquid level in the container. The liquid level sensor converts the liquid level signal in the container into a switch signal or a voltage and current signal, and then through the external circuit, intuitively let the measurer accurately know the liquid in the container. bit situation. At present, the commonly used liquid level sensors on the market mainly include the following: From the above picture, we can see that there are many types of liquid level sensors, so how to choose the sensor? Which liquid level sensor should be used in daily life? 1. First of all, we need to clarify the difference between the liquid level switch and the liquid level gauge. The liquid level switch is a controller that opens the valve of the liquid inlet according to the signal output of the liquid level sensor to keep the liquid level within the set range. It can also be said that the output of the liquid level switch is a switch signal. The liquid level switch must first determine the height of the liquid level, and output the switch signal according to this height. The liquid level gauge converts the height of the liquid level into an electrical signal for output. We can process electrical signals such as connecting to plc, data collector or professional display to output the height of the liquid level. If it is to measure whether the liquid reaches a certain set liquid level range, use the liquid level switch, and use the liquid level gauge to accurately measure the specific height of the liquid. Of course, in some application scenarios, the two can be used in common. 2. Before selecting a model, first of all, it is necessary to clarify the type of the liquid to be tested, and to understand whether the chemical properties of the liquid to be tested are toxic, corrosive, or polluted. If the medium of the liquid to be measured will stick to the sensor or the liquid viscosity is too high, opaque, etc., it is recommended to use non-contact measurement. If the medium is conventional acid-base solution, water, oil, etc., contact measurement or non-contact measurement can be used. 3. With the development of science and technology, some liquid level measurement sensors with backward measurement methods have been eliminated. Using the latest measurement technology, sensors that meet certain requirements for measurement speed and accuracy can better solve the problems encountered in production.

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