Technical Principle Analysis:

1. Buoyancy Principle: According to Archimedes' principle, when an object is submerged in a fluid, the buoyant force it experiences is equal to the weight of the fluid displaced by the object. Therefore, float level/interface measurement relies on the buoyant force acting on a float in a liquid to determine the liquid level or interface position.

2. Sensor Device: Float level/interface measurement typically includes one or multiple floats and a connected sensor device. The sensor device can be mechanical, electronic, or ultrasonic, among others, and is used to detect the position of the float or changes in buoyant force, converting this information into measured values of liquid level or interface position.

3. Calibration: Before installation or during regular maintenance, float level/interface measurement instruments need to be calibrated. During calibration, the instrument is placed at a known liquid level or interface position, and adjustments are made to the sensor device to ensure accurate readings.

Operating Principle of Float Level Measurement:

• Level Measurement: When a float is immersed in a liquid, the buoyant force acting on the float is directly proportional to the height of the liquid level. The sensor device detects the buoyant force acting on the float and converts it into a measured value of the liquid level height. Through calibration and verification, this measured value can be correlated with the actual liquid level.

Operating Principle of Float Interface Measurement:

• Interface Measurement: When there are two different density liquids in a container, the float will stop at the interface between these two liquids. The sensor device detects changes in the buoyant force acting on the float, thus determining the interface position between the two liquids. Through calibration, this measured value of interface position can be correlated with the actual interface position.

In summary, float level/interface measurement utilizes changes in buoyant force acting on a float in a liquid to achieve measurement of liquid level or interface position. Its technical principle is simple yet reliable, widely used in industrial and laboratory settings, among others.