Servo tank gauges and level gauges are two different types of instruments used for measuring the level of liquids in tanks or vessels. While they both serve the purpose of level measurement, they operate based on different principles and have distinct features. Here’s a comparison of servo tank gauges and level gauges:
Operating Principle:
Servo Tank Gauge: A servo tank gauge is a high-precision level measurement system that utilizes the principle of servo technology. It typically consists of a servo motor, a measuring tape, and a displacer (a buoyant object). The displacer is immersed in the liquid inside the tank, and as the liquid level changes, it causes the servo motor to rotate the measuring tape. The rotation of the measuring tape is directly proportional to the liquid level, allowing for accurate and continuous level measurement.
Level Gauge: A level gauge, also known as a sight glass or level indicator, is a simple device that provides a visual indication of the liquid level in a tank. It usually consists of a transparent or translucent tube or glass column installed on the side of the tank. As the liquid level changes inside the tank, the level in the glass tube also changes, providing a visual indication of the current level.
Accuracy:
Servo Tank Gauge: Servo tank gauges are known for their high accuracy and precision. They can provide precise measurements with a high degree of repeatability, making them suitable for applications where precise level control is critical.
Level Gauge: Level gauges provide a basic visual indication of the liquid level and are not as accurate as servo tank gauges. The accuracy of level gauges depends on the quality of the scale markings and the readability of the glass tube.
Application:
Servo Tank Gauge: Servo tank gauges are commonly used in industrial applications where accurate level measurement is essential, such as in storage tanks for oil, chemicals, and other liquids.
Level Gauge: Level gauges are often used in applications where a simple visual indication of the liquid level is sufficient. They are commonly found in small tanks or in scenarios where precise measurements are not critical.
Automation and Integration:
Servo Tank Gauge: Servo tank gauges can be integrated into automated control systems, allowing for remote monitoring and control of the liquid level. They can also be connected to data logging systems for historical level data recording.
Level Gauge: Level gauges are typically manually read, and their readings are not directly integrated into automated systems. However, additional instrumentation can be added to automate the level indication process.
Servo tank gauges offer precise and accurate level measurements suitable for industrial applications that require high precision and control. On the other hand, level gauges provide a basic visual indication of the liquid level and are commonly used in simpler applications where precise measurements are not as critical. The choice between the two depends on the specific requirements of the application and the level of accuracy needed for the task.