A servo tank gauge is a precise measuring instrument used primarily in the oil, gas, and chemical industries to determine the level of liquids within storage tanks. This device operates based on servo mechanisms, providing highly accurate and continuous measurements of tank levels.
How It Works
- Suspended Displacer: A small displacer (a weighted object) is attached to a measuring wire or tape that is lowered into the tank.
- Servo Motor: The servo motor controls the movement of the displacer, lowering or raising it until it reaches the liquid’s surface.
- Balance Point: When the buoyant force of the liquid equals the weight of the displacer, the system identifies this as the liquid level.
- Measurement Signals: The position of the displacer is tracked, and the data is converted into electronic signals for precise level measurement.
Key Features
- High Accuracy: Can measure liquid levels with millimeter-level precision.
- Multi-parameter Measurement: Besides level, many servo tank gauges also measure temperature, density, and interface levels (e.g., between oil and water layers).
- Remote Monitoring: Modern servo gauges can transmit data to a central control system for real-time monitoring and data analysis.
Applications
- Inventory Management: Used for precise liquid inventory in storage tanks.
- Custody Transfer: Ensures accurate measurement of liquids during transactions between parties.
- Tank Farm Operations: Tracks levels in multiple tanks for operational efficiency.
- Safety Monitoring: Prevents overfilling and reduces spill risks in tanks containing hazardous substances.
Advantages
- Non-invasive: The gauge does not require immersion into the liquid for functionality.
- Durability: Works effectively in harsh environments, including extreme temperatures and corrosive substances.
- Integration: Compatible with other tank gauging systems like radar or ultrasonic for redundancy or comprehensive monitoring.
Servo tank gauges are crucial in industries that require accurate and reliable liquid level measurement for safety, compliance, and operational efficiency.