Do You Know How Many Common Types of Level Gauges?(2/3)
We briefly explained the names and principles of the 7 types of common liquid level gauges in Chapter 1 last week. Today we will continue to explain the other 6 common types of liquid level gauges in Chapter 2 one by one:
Glass Plate Level Gauge (Glass Tube Level Gauge)
The glass plate type liquid level gauge is connected to the container through a flange to form a communicating vessel. The height of the liquid level in the container can be directly read through the glass plate.
The pressure level gauge adopts the static pressure measurement principle. When the liquid level transmitter is put into a certain depth in the measured liquid, the sensor is subjected to the pressure of the liquid surface. At the same time, the pressure of the liquid is introduced into the positive pressure cavity of the sensor through the gas-conducting stainless steel. Then the atmospheric pressure Po on the liquid surface is connected to the negative pressure cavity of the sensor to offset the Po on the back of the sensor. The pressure measured by the sensor is: ρ.g.H. By measuring the pressure P, the liquid level depth can be obtained.
Capacitive Level Gauge
The capacitive level gauge measures the height of the liquid by measuring the change in capacitance. It is a metal rod inserted into a liquid container, with the metal rod as one pole of the capacitor and the container wall as the other pole of the capacitor. The medium between the two electrodes is the liquid and the gas above it. Since the dielectric constant ε1 of the liquid is different from the dielectric constant ε2 on the liquid surface, for example: ε1>ε2, when the liquid level rises, the total dielectric constant value between the two electrodes of the capacitive level gauge increases, and thus the capacitance increases. Conversely, when the liquid level drops, the ε value decreases, and the capacitance also decreases. Therefore, the capacitive level gauge can measure the height of the liquid level by the change in capacitance between the two electrodes.
Intelligent Electric Float Level Gauge
The intelligent electric float level gauge is a liquid level measuring instrument designed based on Archimedes' principle and magnetic coupling principle. The instrument can be used to measure liquid level, boundary level and density, and is responsible for the output of upper and lower limit alarm signals.
Buoy Level Gauge
It is designed and manufactured based on the principle of mechanical balance. When the liquid level changes, the original mechanical balance will reach a new balance through the movement of the steel belt (rope) under the disturbance of the float by the buoyancy. The liquid level detection device (float) drives the steel belt (rope) to move according to the liquid level. The displacement transmission system drives the on-site indication device through the movement of the steel belt (rope), and then displays the liquid level on the display device.
Float Level Transmitter
The float is immersed in the liquid in the float chamber and is rigidly connected to the torque tube system. The force borne by the torque tube system is the net value of the float's own weight minus the buoyancy of the float. Under this combined force, the torque tube twists a certain angle. Changes in the position, density or interface height of the liquid in the float chamber cause changes in the buoyancy of the float immersed in the liquid, thereby changing the rotation angle of the torque tube. This change is transmitted to the sensor rigidly connected to the torque tube, causing the sensor output voltage to change, which is then amplified by the electronic components and converted into a 4-20mA current output. The float level transmitter uses a microcontroller and related electronic circuits to measure process variables, provide current output, drive LCD display and provide HART communication capabilities.
TO BE CONTINUED
Level Sensors' Manufacturer. OEM/ODM
Email:felix@cnbc-sensor.com; Whatsapp:+8618161903310
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