Seven commonly used liquid level measurement methods

Liquid level sensor (hydrostatic level gauge/liquid level transmitter/liquid level sensor/water level sensor) is a sensor that measures liquid level. Liquid level sensors are divided into two categories according to the contact mode: one is contact type, including single-flange static pressure/double-flange differential pressure liquid level transmitter, floating ball liquid level transmitter, and magnetic liquid level transmitter , Submersible level transmitter, electric internal float level transmitter, electric float level transmitter, capacitive level transmitter, magnetostrictive level transmitter, servo level transmitter Wait. The second type is non-contact type, including ultrasonic liquid level transmitter, radar liquid level transmitter, ultrasonic external sticking liquid level gauge, etc. Liquid level sensors are widely used in machinery manufacturing, chemical control, light industry automation and other related fields. Different detection methods have their own advantages and disadvantages. Let’s take a look at 7 common liquid level measurement methods. Floating ball detection is the simplest and oldest detection method, and the price is relatively cheap. The change of the liquid level is mainly detected by the up and down of the floating ball. It is a mechanical detection, the detection accuracy is easily affected by the buoyancy, the repeatability is poor, and different liquids need to be recalibrated. It is not suitable for viscous or impurity-containing liquids, which is easy to cause the floating ball to block. At the same time, it does not meet the application requirements of the food hygiene industry. Capacitive measurement Capacitive measurement mainly measures the height of the material by detecting the change in capacitance value caused by the change of the liquid level or the height of the bulk material. It has various types, including capacitive liquid level gauges that can output analog quantities, liquid level capacitive proximity switches, and capacitive proximity switches that can be installed on the side of the container for non-contact detection. When choosing, care must be taken that capacitive sensors are susceptible to different container materials and solution properties. Static pressure measurement This measurement method uses a pressure sensor installed at the bottom. By detecting the liquid pressure at the bottom, the liquid level height is converted and calculated. The reference value of the bottom liquid pressure is the atmospheric pressure or known air pressure connected to the top. This detection method requires the use of high-precision, flush-type pressure sensors, and the conversion process requires constant calibration. Photoelectric refraction measurement This detection method emits a light source inside the sensor, and the light source is totally reflected to the sensor receiver through the transparent resin, but when it encounters the liquid level, part of the light will be refracted to the liquid, so that the sensor detects the reduction in the total reflected light value. Monitor the liquid level. The detection method is cheap, easy to install and debug, but can only be applied to transparent liquids, and only outputs switch signals. Tuning fork vibration measurement Tuning fork type measurement is only switch output and cannot be used for continuous monitoring of liquid height. The principle is: when the two vibrating forks are filled with liquid or bulk material, when the resonant frequency changes, the switch signal is sent out depending on the change of the detection frequency. It can be used for high-viscosity liquid or solid bulk monitoring, mainly for anti-overflow alarm, low-level alarm, etc. It does not provide analog output. In addition, in most cases, it needs to be installed on the side of the container. Because the principle of ultrasonic measurement is to calculate the liquid level height by detecting the time difference between ultrasonic transmission and reflection, it also has the characteristics of easy installation and high flexibility. The transmitted ultrasonic wave receives the echo after encountering the liquid surface reflection, and calculates the liquid level height according to the speed of sound and the reflection time; the liquid-intermediate type, also known as the external measurement type or externally attached liquid level gauge, is to attach the probe to the bottom of the container, and the probe The transmitted ultrasonic wave is reflected by the liquid-gas interface and then received the echo, and the liquid level height is calculated according to the speed of sound and the reflection time. Microwave principle measurement is also known as radar type, which has the advantages of laser measurement, such as: easy installation, calibration, good flexibility, etc. In addition, it is better than laser detection, such as no need for repeated calibration and multi-function output, etc., it is suitable for It is suitable for liquid level detection with various foams, not affected by the color of the liquid, and can even be applied to highly viscous liquids, with relatively little interference from the external environment.
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