A Servo Tank Gauge is a device used for accurate level measurement in tanks. It typically employs a servo motor-driven measuring tape or wire that is lowered into the tank, and the level is determined based on the length of tape extended. Here’s a brief overview of the level instrumentation of a Servo Tank Gauge:
Servo Motor and Reel:
The heart of the Servo Tank Gauge is the servo motor and reel mechanism. The servo motor controls the movement of the measuring tape or wire.
Measuring Tape or Wire:
The measuring tape or wire is usually made of stainless steel or another corrosion-resistant material. It is attached to the servo motor’s reel and is lowered into the tank to measure the liquid level.
Sensor System:
The Servo Tank Gauge is equipped with a sensor system that monitors the position of the measuring tape or wire. This system provides feedback to the servo motor, allowing it to precisely control the tape’s movement.
Position Measurement:
The position of the measuring tape or wire is directly proportional to the liquid level in the tank. As the tape is lowered or raised, the sensor system continuously measures its position, providing real-time data on the level of the liquid.
Electronic Display/Control Unit:
The level information obtained by the sensor system is sent to an electronic display or control unit. This unit may be located at the tank site or connected to a central control room.
Calibration:
The Servo Tank Gauge requires calibration to ensure accurate level measurements. This calibration process involves correlating the position of the measuring tape or wire with the actual liquid level in the tank.
Communication Interfaces:
Many modern Servo Tank Gauges are equipped with communication interfaces, allowing them to integrate with control systems, distributed control systems (DCS), or supervisory control and data acquisition (SCADA) systems. This enables remote monitoring and control of tank levels.
Safety Features:
Servo Tank Gauges often include safety features, such as alarms for high or low-level conditions. These alerts help operators take corrective actions in case of abnormal tank levels.
Maintenance and Diagnostics:
Regular maintenance and diagnostic features are essential for ensuring the proper functioning of the Servo Tank Gauge. This may include self-diagnostic checks, automatic error detection, and preventive maintenance routines.
Servo Tank Gauges are widely used in industries such as oil and gas, petrochemicals, and water treatment, where accurate and reliable tank level measurements are critical for operational efficiency and safety.