Ball level gaugeIn the field of industrial applications, it is commonplace and designed based on Archimedes' buoyancy principle and magnetic coupling. The float moves up and down with the change of liquid level in the container. Due to the magnetic effect, the reed switch of the float level gauge is magnetically attracted, causing the resistance inside the sensor to change linearly. Then, the converter converts this resistance change into a 4mA~20mA standard DC signal output, achieving long-distance liquid level detection and control.

Floating ball level gauges are popular due to their simple structure, easy operation, good reliability, high accuracy, and low consumption. They are widely used for industrial measurement and control of liquid levels in various tanks such as dam (reservoir) water level detection, sewage treatment, petrochemical raw material storage, food and beverage, and underground inventory of gas stations. Liquid level measurement in instruments usually uses a level gauge to measure the height of the liquid level in the tank and box, displaying the height of the liquid level inside. Among them, a float level gauge is a widely used measuring instrument in most level gauges.

　　Principle and structure of float level gauge:
The float level gauge is mainly composed of a float ball, a plunger, etc.
The floating ball level gauge is installed on the top of the container through a connecting flange. The floating ball floats on the liquid surface according to the principle of equal volume of liquid when displaced. When the liquid level of the container changes, the floating ball also moves up and down. Due to the magnetic effect, the dry spring of the floating ball level gauge is magnetically attracted, and the liquid level position is changed into an electrical signal. The actual position of the liquid is displayed digitally by the display instrument, and the floating ball level gauge achieves remote detection and control of the liquid level.

　　Scope and characteristics of application:
Floating ball level gauges are almost applicable to liquid level measurement and control in various industrial automation processes, and can be widely used for liquid level measurement, control, and monitoring in fields such as petroleum processing, food processing, chemical engineering, water treatment, pharmaceuticals, power, papermaking, metallurgy, ships, and boilers.

The float level gauge consists of a liquid level sensor and an intelligent HART board (current converter). The float changes synchronously with the liquid level, controlling the suction and disconnection of the reed switch to make the resistance inside the sensor change linearly. The converter then converts the resistance change into a 4-20mA standard current signal and superimposes it with the HART digital signal for output. The remote supply control room can achieve automatic detection, control, and recording of liquid level.

　　Key points and installation instructions for selecting float level gauges:
There are two floating forms of float level gauges, one is that the float moves while the guide rod remains stationary; Another type is when the float and guide rod move simultaneously. The former type of float and guide rod should not have any debris between them, which should be taken into account when selecting. The latter type should avoid splashing debris on the guide rod, and at the same time, this form has less resistance to medium flow. When installing and positioning, attention should be paid to avoiding it.

The common point is that there should be no obstacles when the floating ball moves up and down. The installation verticality should meet the requirements. When the medium flows, it should be avoided to install it in a fast stream. If necessary, the guide rod can be reinforced or a static sleeve can be installed.

　　Float level gaugeInstallation instructions:
1. The tested medium should not contain ferromagnetic impurities.
2. In order to prevent the floating ball from slipping or colliding at high speed on the sealed tube during transportation, which may cause the measuring strip to come out, the instrument is fixed with clamps at the bottom of the sealed tube and magnetic steel at the top of the sealed tube before leaving the factory. Before installation and use, users should first remove the clamp, raise the float to the top of the sealing tube, and then gently move the float down, and the needle should rotate accordingly.
3. The dial indicator of the instrument is pointer type. When measuring full degree, the indicator numbers are arranged in the direction of the needle, and when measuring empty degree, the indicator numbers are arranged counterclockwise.
4. The instrument comes with an installation flange when it leaves the factory, and the user should have a matching pipeline flange.
5. The installation position of the instrument is generally selected at half of the range.

　There are four installation methods for measuring the float level:

1: Side bottom installation 2: Top installation 3: Side side installation