Structure and working principle of electric float level gauge
Electric buoy level gauge is a level measuring instrument designed according to Archimedes law and magnetic coupling principle. It can be used to measure water level, boundary and density, and is responsible for limiting the output of alarm signals up and down. It is used to measure the internal water level of pressure vessel and consists of four basic parts: buoy, spring, magnetic rifling and indicator.
The electric buoy liquid level gauge system is composed of detection, conversion and transmission. The inspection part is composed of buoy and link. The conversion part is composed of lever, torsion tube assembly and sensor, and the transmission part is composed of CPU, a / D, D / A and LCD display.
Working principle of electric buoy level gauge:
If the liquid is measured as no liquid level, the buoyancy is not affected by the buoyancy, the connecting wire connected to the top of the buoy is in a tight state, and the torque lever is affected by the gravity of the buoy to produce a fixed torque. At this time, the buoy water level gauge needs to output 4 mA current. That is, the buoy water level gauge is zero.
After the measured liquid level rises, the liquid enters the measuring tank, the peak water level of the buoy rises, the volume of the discharged liquid increases, and the volume of the internal buoy submerged in the medium also increases. According to Archimedes' law, the buoyancy of an object is equal to the volume of liquid discharged by the object (that is, the volume of the object immersed in water). The buoy rod is a metal tube with small volume and large weight, so the weight of the liquid discharged by the buoy is less than the weight of the buoy itself, so the connector above the buoy is still tight. The torsion bar will subtract the weight of the liquid discharged by the buoy (buoyancy of buoyancy) from the gravity of the buoy to produce a variable torque. At this time, the output current of the buoy water level gauge is greater than 4 mA.
When the water level z.ui of the tested liquid is high, all the buoys are submerged by the test liquid. At this time, the volume weight of the liquid discharged by the buoy is a fixed number, and the torsional force borne by the torsion bar is the weight of the buoy itself minus the weight of the liquid discharged by the buoy. At this time, the torsion bar bears a fixed torsion force, and the current output by the buoy water system is full of 20 mA, that is, the buoy water system.