Magnetic flip-flop level gauge false level what is the reason?

Project Overview

The magnetic flap level gauge is developed based on the buoyancy principle and magnetic coupling. This kind of liquid level gauge generally uses the principle of magnetostriction, transmits the signal of the magnetic float through the waveguide wire, and then processes the signal by the circuit to obtain the liquid level value. When the liquid level in the measured container rises and falls, the magnetic float in the body tube of the liquid level gauge also rises and falls. The permanent magnet in the float is transmitted to the magnetic flip column indicator through magnetic coupling, driving the red and white flip columns to flip 180 degrees. °, when the liquid level rises, the flip column changes from white to red, and when the liquid level drops, the flip column changes from red to white. The red and white junction of the indicator is the actual height of the liquid level inside the container, thereby achieving a clear liquid level.

Since the measurement and display part of the magnetic flap level gauge is not in direct contact with the medium, this type of liquid level gauge is generally highly reliable. Remember not to measure while the power is on. When using a logic pen or oscilloscope to detect signals, use a multimeter to check the ohm value. Be careful not to let the probe touch two measurement pins at the same time, because the essence of this situation is to form a short circuit when power is turned on.

When troubleshooting instrument faults in a humid environment, it is necessary to use a multimeter to check whether each point of the printed circuit is smooth, because the main fault in this case is copper foil corrosion. When inspecting the internal circuit of the instrument, if the contacts of the installation components and the circuit board are coated with insulating varnish, when measuring the parameters of each point, an ordinary hand-sewn needle can be soldered to the test leads of the multimeter to penetrate the paint layer and directly measure each point without using a large instrument. Area peeling off paint. Do not plug or unplug various control boards and plugs while the power is on. Because when the power is on, plugging and unplugging the control board will generate a strong induced electromotive force. At this time, the instantaneous counterattack voltage is very high, and it is easy to damage the corresponding control board and plug. Do not knock or bump blindly during maintenance to avoid expanding the fault and making it worse with more repairs. When disassembling and adjusting the side-mounted magnetic flap level gauge, the original position should be recorded for restoration. When repairing precision instruments, if small parts are accidentally bounced off, magnet scanning and line-of-sight scanning methods can be used to search for them.

The reasons for the false liquid level in the magnetic flap level gauge are as follows:

1. The external interference signal is too large, causing the circuit to get a false signal, not a false one. Actual measured signal;

2. Waveguide wire failure inside the liquid level gauge, such as looseness, poor sealing, water intrusion and corrosion, etc., causing signal distortion;

3. Waveguide wire installation Incorrect, signal transmission is distorted;

4. Signal processing circuit failure.