Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-11-20

The float level transmitter consists of a float measurement chamber, a measuring mechanism, and a float. By utilizing the principle of levers and stress measurement, changes in the buoyant force acting on the inner float cause the torsion tube to twist, enabling a high-precision sensor to generate measurement signals that correspond to changes in liquid level. These signals are then converted into standard 4–20mA signals through specialized circuits. Functions of the main components and their working principle: At the end of the lever, an inner cylinder is suspended; this inner cylinder rises and falls as the buoyancy force of the medium changes. This buoyancy force acts on the lever, which in turn causes the torsion bar connected to the force-transmitting shaft to rotate. One end of the torsion bar exerts pressure on the weight sensor, causing it to deform slightly. The sensor converts this deformation into an electrical signal, which is then processed and transformed by a signal processing circuit into a standard 4–20mA signal, thus completing the conversion process.

The float level transmitter consists of a float measurement chamber, a measuring mechanism, and a float. By utilizing the principle of levers and stress measurement, changes in the buoyant force acting on the inner float cause the torsion tube to twist, enabling a high-precision sensor to generate measurement signals that correspond to changes in liquid level. These signals are then converted into standard 4–20mA signals through specialized circuits. Function of the main components and their working principle: At the end of the lever, there is an inner cylinder; this cylinder rises and falls as the buoyancy force of the medium changes. This buoyancy force acts on the lever, which in turn causes the torsion bar connected to the force-transmitting shaft to rotate. One end of the torsion bar exerts pressure on the weight sensor, causing it to deform slightly. The sensor converts this deformation into an electrical signal, which is then processed and transformed by a signal processing circuit into a standard 4–20mA signal, thus completing the conversion process

The float level gauge is a level measurement instrument designed based on Archimedes’ principle and magnetic coupling. It can be used to measure liquid levels, interface levels, and density, and it is responsible for generating alarm signals for upper and lower limit conditions. Designed specifically for measuring the liquid level in pressure vessels, it consists of four basic components: a float, a spring, a magnet chamber, and an indicator. Principle: A float submerged in a liquid is subject to the combined effects of downward gravity, upward buoyancy, and spring force. When these three forces are in balance, the float remains stationary at a certain position. When the liquid level changes, the buoyant force acting on the float changes accordingly, breaking the equilibrium state and thus causing a change in elasticity, that is, the expansion or contraction of the spring, in order to reach a new equilibrium. The expansion and contraction of the spring cause it to move relative to the magnet that is rigidly connected. In this way, the magnetic sensing element inside the indicator and the transmission mechanism are used to indicate the liquid level. The instrument of the limit switch can provide an alarm function for the liquid level signal.

The float level transmitter consists of a float measurement chamber, a measuring mechanism, and a float. By utilizing the principle of levers and stress measurement, changes in the buoyant force acting on the inner float cause the torsion tube to twist, enabling a high-precision sensor to generate measurement signals that correspond to changes in liquid level. These signals are then converted into standard 4–20mA signals through specialized circuits. Functions of the main components and their working principle: At the end of the lever, an inner cylinder is suspended; this inner cylinder rises and falls as the buoyancy force of the medium changes. This buoyancy force acts on the lever, which in turn causes the torsion bar connected to the force-transmitting shaft to rotate. One end of the torsion bar exerts pressure on the weight sensor, causing it to deform slightly. The sensor converts this deformation into an electrical signal, which is then processed and transformed by a signal processing circuit into a standard 4–20mA signal, thus completing the conversion process.

: A float submerged in a liquid is subject to the combined effect of downward gravity, upward buoyancy, and spring force. When these three forces are in balance, the float remains stationary at a certain position. When the liquid level changes, the buoyant force acting on the float changes accordingly, breaking the equilibrium state and thus causing a change in elasticity, that is, the expansion or contraction of the spring, in order to reach a new equilibrium. The expansion and contraction of the spring cause it to move relative to the magnet that is rigidly connected

The tank level transmitter consists of a float measurement chamber, a measurement mechanism, and a float. By utilizing the principle of levers and stress measurement, changes in the buoyant force acting on the inner float cause the torsion tube to twist, enabling a high-precision sensor to generate measurement signals that correspond to changes in liquid level. These signals are then converted into standard 4–20mA signals through specialized circuits. Functions of the main components and their working principle: At the end of the lever, an inner cylinder is suspended; this inner cylinder rises and falls as the buoyancy force of the medium changes. This buoyancy force acts on the lever, which in turn causes the torsion bar connected to the force-transmitting shaft to rotate. One end of the torsion bar exerts pressure on the weight sensor, causing it to deform slightly. The sensor converts this deformation into an electrical signal, which is then processed and transformed by a signal processing circuit into a standard 4–20mA signal, thus completing the conversion process.

The float level transmitter consists of a float measurement chamber, a measuring mechanism, and a float. By utilizing the principle of levers and stress measurement, changes in the buoyant force acting on the inner float cause the torsion tube to twist, enabling a high-precision sensor to generate measurement signals that correspond to changes in liquid level. These signals are then converted into standard 4–20mA signals through specialized circuits. Functions of the main components and their working principle: At the end of the lever, an inner cylinder is suspended; this inner cylinder rises and falls as the buoyancy force of the medium changes. This buoyancy force acts on the lever, which in turn causes the torsion bar connected to the force-transmitting shaft to rotate. One end of the torsion bar exerts pressure on the weight sensor, causing it to deform slightly. The sensor converts this deformation into an electrical signal, which is then processed and transformed by a signal processing circuit into a standard 4–20mA signal, thus completing the conversion process.

When the buoyant force acting on the float balances its weight, it causes the torsion tube to twist; after further processing, a standard electrical signal is generated, thereby allowing the liquid level or interface to be determined.

Please note that it is a \"internal float level gauge\", not a \"float level gauge\"”