PPH storage tank knowledge points: the working principle of the float level gauge

Working principle: The float level gauge uses a magnetic float as the measuring element. Through magnetic coupling, the internal resistance of the sensor changes linearly. The intelligent converter converts the resistance change into a 4-20mA standard current signal, and superimposes the HART signal output Or on-site LCD display, which can display the percentage of liquid level, 4-20mA current and liquid level value on site, and remotely transmit to the control room to realize automatic detection, control and recording of liquid level.

Application range: Suitable for sewage treatment in petroleum, chemical, electric power, light industry and medicine industries and the measurement of medium level in various atmospheric and pressure windows, especially for underground storage tanks and storage tanks. It is suitable for continuous measurement of the liquid level of high temperature, high pressure, viscous, dirty media, asphalt, wax-containing oil and other flammable, explosive, and corrosive media.

Restrictions on use: Generally used in low-range medium viscous and dirty tanks, sewage tanks, and large-scale narrow tanks are not applicable, and the operating conditions are relatively narrow.

Accuracy grade: 1.5 grade (my country's industrial instrument grades are divided into seven grades: 0.1, 0.2, 0.5, 1.0, 1.5, 2.5, 5.0) Below 1.0 is high precision.
Advantages: It can effectively overcome the false liquid level formed by suspended solids, foam, etc.;

The indication is novel, the reading is intuitive, eye-catching, and the direction of the observing indicator can be changed according to the needs of the user;

The measurement range is large, not limited by the height of the storage tank; the floating ball can measure the interface of two liquids by counterweight;

The indicating mechanism is completely isolated from the medium, with good sealing, high reliability and safe use;

Simple structure, convenient installation, convenient maintenance, corrosion resistance, no power supply, explosion-proof.

shortcoming:

1. General accuracy

2. The range is limited