A servo tank gauge employing a displacer-type level indicator is a device utilized to measure and monitor the level of liquid inside a tank or vessel. It operates based on the principle of buoyancy, where a displacer, typically a buoyant element, is immersed in the liquid. The displacer’s position changes according to the liquid level, and this movement is used to determine the level of the substance in the tank.
Here’s an overview of how a displacer-type level indicator in a servo tank gauge functions:
- Displacer Design: The displacer is usually a solid, buoyant element, often cylindrical or conical in shape, made of a material lighter than the liquid it is measuring. This displacer is connected to a measuring wire or cable.
- Displacer Movement: As the liquid level changes within the tank, the displacer experiences buoyancy force changes, causing it to move up or down within the liquid. This movement is transmitted through the measuring wire or cable connected to a servo motor.
- Servo Motor Operation: The servo motor, controlled by the measuring system, adjusts the length of the wire or cable connected to the displacer. This adjustment ensures that the displacer remains at a specific position relative to the liquid level, compensating for changes in density or pressure variations.
- Measurement and Output: The servo motor’s movements are precisely controlled based on the liquid level changes, and this information is converted into a readable format, usually as a level reading or signal output.
- Accuracy and Calibration: Displacer-type level indicators in servo tank gauges are known for their accuracy in measuring liquid levels. Proper calibration is necessary to ensure the accuracy of the readings, accounting for factors like liquid density, temperature variations, and tank geometry.
These systems are commonly used in industries where accurate and continuous measurement of liquid levels in tanks is critical, such as in oil refineries, chemical plants, storage terminals, and various other industrial applications. They provide reliable and precise data on liquid levels, aiding in inventory management, process control, and preventing overflows or shortages.