Structure of magnetic flap level gauge

The magnetic flap level gauge has intuitive and eye-catching display, wide viewing angle, compact and reasonable structure, safety and reliability, and no "running, emitting, dripping, or leaking" phenomenon. The new sulfur recovery unit uses magnetic flap level gauges to monitor the liquid level in the steam drum, alkali tank, etc. The liquid level gauge is developed based on the principle of buoyancy and magnetic coupling. When the liquid level in the tested container rises or falls, the magnetic float in the liquid level gauge body tube also rises or falls accordingly. The magnetic steel inside the float is transmitted to the magnetic flip column indicator through magnetic coupling, driving the red and white flip columns to flip 180 °. When the liquid level rises, the flip column changes from white to red, and when the liquid level falls, it changes from red to white. The red white boundary of the indicator is the actual height of the liquid level inside the container, thus achieving clear indication of the liquid level.

The structure of the magnetic flap level gauge consists of a float (main tube), magnetic float, magnetic flap (magnetic flap column), indicator, drain valve, connecting flange, etc. As shown in the figure:

① Indicator; ② Magnetic float; ③ Float; ④ Connecting flanges; ⑤ Discharge valve

Structure principle of magnetic flap level gauge

1. Basic level gauge

The liquid level gauge uses a magnetic float as the measuring element. The float floats up and down in the measuring tube with the change of liquid level. Through magnetic coupling, it drives the red and blue indicator tubes inside the indicator to flip 180 °. When the liquid level rises, the indicator tube changes from blue to red; When descending, it changes from red to blue to achieve dual color display of liquid level. When the medium temperature is ≥ 300 ℃, white and blue indicator tubes are used.

2. Alarm device

The alarm consists of a reed switch and an explosion-proof junction box, which are fastened on the outside of the measuring tube. The alarm is driven by a magnetic float, and the output alarm switch signal is transmitted to the secondary instrument to achieve remote liquid level upper and lower limit alarm and light display.

3. Transmitter

The transmitter consists of two parts: a liquid level sensor and a converter. The sensor consists of several reed switches and resistors installed inside a stainless steel tube with an inner diameter of 20, fastened on the outside of the measuring tube. The converter is composed of electronic modules and installed in the junction box of the sensor.

The sensor converts the changes in the liquid into the magnitude of the resistance value through the coupling effect of the magnetic float, and then converts it into a 4-20mA.DC standard current signal through the converter, which is sent to the secondary instrument to achieve long-distance liquid level/analog display.