There are several different types of tank gauging systems used to measure and monitor the level, volume, and other parameters of liquids in tanks. Here are some common types of tank gauging systems:
- Float and Tape System: This traditional system consists of a float connected to a tape or wire. The float moves up and down with the liquid level, and the tape/wire indicates the level on a calibrated scale. This system requires manual reading and is commonly used for small or atmospheric tanks.
- Radar Level Gauges: Radar-based systems use electromagnetic waves to measure the distance between the gauge and the liquid surface. They provide continuous level measurement, are suitable for various tank sizes, and can be used in different liquid types. Radar level gauges can also provide additional information, such as temperature and density.
- Servo or Displacer Level Gauges: These systems use a servo motor or displacer to measure the liquid level. The servo motor adjusts the position based on liquid level changes, while the displacer senses the buoyancy forces. These systems provide high accuracy and are commonly used in large tanks or in applications requiring precision.
- Ultrasonic Level Gauges: Ultrasonic gauges utilize sound waves to measure the distance between the gauge and the liquid surface. They emit ultrasonic pulses and measure the time it takes for the pulses to return. Ultrasonic level gauges are non-contact and suitable for a wide range of tank sizes and liquid types.
- Capacitance Level Gauges: Capacitance-based systems measure the changes in electrical capacitance between the probe and the tank wall. As the liquid level changes, the capacitance varies, providing an indication of the level. These systems can be used in various tank sizes and are suitable for both conductive and non-conductive liquids.
- Differential Pressure Level Gauges: These gauges measure the pressure difference between the tank’s bottom and the liquid surface. The pressure difference is proportional to the liquid level. Differential pressure level gauges are commonly used in pressurized tanks or when dealing with hazardous or corrosive liquids.
- Guided Wave Radar Level Gauges: Guided wave radar systems use radar technology to measure the level of liquids. They employ a waveguide that guides the radar signal along its length, and the reflection of the signal indicates the liquid level. These systems are suitable for both liquids and solids and can handle challenging process conditions.
It’s important to note that the choice of tank gauging system depends on factors such as tank size, liquid properties, accuracy requirements, environmental conditions, and regulatory standards. Each system has its advantages and limitations, and selecting the appropriate system should be based on the specific application and operational needs.