The working principle and difference of various liquid level switches

The production and development of chemical, food and beverage, pharmaceutical and other industries are inseparable from the control of liquid level. The importance of liquid level sensors has become increasingly prominent, and even directly affects the quality of products. Let's take a look at the principle of various liquid level switches and the comparison and application with other liquid level switches. A liquid level switch is a switch used to control the liquid level. When the measured liquid medium reaches a certain indicated position, the liquid level switch will output an alarm signal according to its working principle, thereby stopping the continuous delivery of the liquid medium; when the measured liquid medium is lower than a certain set position, the liquid level switch will also An alarm signal will be output to remind the headquarters to open the gate and start delivering liquid. As shown in the figure below: Liquid level switches include float level switches, tuning fork level switches, capacitive level switches, ultrasonic level switches, etc. The float level switch structure is mainly designed and produced based on the principles of buoyancy and static magnetic field. The position of the float with a magnet (abbreviated as float) in the measured medium is affected by buoyancy: changes in the liquid level lead to changes in the position of the magnetic float. The magnet in the float and the sensor (reed switch) act to generate the switching signal. The float level switch mainly detects the change of the liquid level through the up and down of the float. When measuring viscous or impurity-containing liquids, it is easy to cause the float to be blocked, resulting in the float rising and falling slowly. The working principle of the tuning fork level switch is to make the tuning fork vibrate at a certain resonance frequency through a pair of piezoelectric crystals installed on the base. When the tuning fork of the tuning fork level switch is in contact with the measured medium, the frequency and amplitude of the tuning fork will change. These changes of the tuning fork level switch are detected by the intelligent circuit, processed and converted into a switch signal to reach the liquid level. for alarm or control purposes. To allow the fork to reach into the tank, a flanged or threaded process fitting is usually used to mount the fork switch to the side or top of the tank. The tuning fork liquid level switch mainly detects the change of the liquid level by measuring the change of the resonance frequency when the medium between the two vibrating tuning forks changes. When the tuning fork liquid level switch measures the viscosity medium, the fork body is easily accumulated by the material between the forks that are stuck together, resulting in a false alarm. The measurement principle of the capacitive liquid level switch is that the change of the level of the solid material causes the size of the area covered by the probe to change, which leads to the change of the capacitance value. The probe and the tank wall (made of conductive material) form a capacitor. When the probe is in air, a small initial capacitance value is measured. When material is injected into the tank, the capacitance value will increase correspondingly with the increase of the area of ​​the probe covered by the material, and the switch state will change. The capacitive liquid level switch measures the liquid level or the height of the material level by detecting the change of the capacitance value when the liquid level or bulk material height changes. When measuring viscous medium, it is easy to form the material hanging on the switch rod, which affects the output of the analog quantity and produces false alarms. The ultrasonic externally attached liquid level switch is a new type of liquid level monitoring and alarm device. It is mainly used to monitor the liquid level of the storage tank, to realize the upper and lower limit alarms or to monitor whether there is a medium in the pipeline (dry protection). A sonar pulse generated by an externally mounted liquid level switch sensor (probe) can pass through the vessel wall, travel through the vessel wall and in the liquid, and be reflected back. Through the detection and calculation of this reflection characteristic, it can be judged whether there is liquid in the container at the monitoring point. At the same time, the externally attached liquid level switch can output relay signals to the subsequent electrical appliances or other equipment, so as to realize the monitoring or control of the liquid level.

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