Cause analysis and solutions for inaccurate indication of side-mounted magnetic flap level gauge

The installation methods of the magnetic flap level gauge mainly include side-mounted magnetic flap level gauge and top-mounted magnetic flap level gauge. In actual use, due to the height restriction of the top-mounted installation method, Generally, it is not recommended to install top-mounted tanks for tanks over four meters. Most of the measurement sites use side-mounted magnetic flap level gauges. In addition to the different installation methods, the two products are also different in internal structure. However, the working principle of measurement is the same. The side-mounted magnetic flap level gauge uses a magnetic float as the sensing element, which is made according to the principle of buoyancy and magnetic coupling. The actual height of the liquid level in the container can be directly observed through the magnetic flap. , the float in the measuring tube changes with the measured liquid level in an equal amount. 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, and the magnetic steel in the float is transmitted to the The magnetic flap indicator drives the red and white flaps to turn 180°. When the liquid level drops, the flap changes from red to white. When the liquid level rises, the flap changes from white to red. The actual height of the liquid level inside the container is The red and white junction of the indicator enables a clear indication of the liquid level. The side-mounted magnetic flap liquid level gauge is generally side-mounted. First, check whether the valves on the upper and lower connecting pipes are open, especially sometimes the valve on the connecting pipe needs to be closed for maintenance, and the valve is forgotten to be opened after the maintenance is completed. If this phenomenon still occurs after both valves are opened, it may be that the float is stuck, because the float is magnetic, and the ferromagnetic substances in the condenser are easily attached to the surface. The worse the water quality and the longer the time, the impurities attached The more it is, the easier it is to cause the float to jam; in addition, the float leaks, the float is damaged, the float loses its magnetism, the magnetism is too weak, or there are foreign objects in the body tube, which may also cause no indication of the liquid level. The side-mounted magnetic flap level gauge is a reliable safety instrument and is widely used in pressure vessels of thermal power plants: high and low pressure deaerators, raw water heaters, heating network heaters, high and low pressure heaters of units, condensing steam Such liquid level gauges are installed in heat exchangers such as heat exchangers. The working medium of the heat exchanger is a liquid that is easy to vaporize. The pressure ranges from vacuum to 2.5Mpa and the temperature ranges from 40°C to 390°C. Therefore, the daily maintenance of the liquid level gauge and the accuracy of the indication are very important for the safe operation of the equipment. to a vital role. 1. Judgment method for inaccurate indication of side-mounted magnetic flap liquid level gauge. (1) The container is always running, but the liquid level of the container is always stopped at a certain point. (2) The container increases or decreases the load, and the liquid level of the container remains unchanged. (3) The local liquid level gauge does not match the pressure difference level gauge on the indoor display screen. 2. The reason for the inaccurate indication of the side-mounted magnetic flap level gauge. (1) The water in the container rises or falls too fast, that is to say, the float rises or falls too fast, and the magnetic flap does not have time to flip. (2) The center of gravity of the magnetic flap is not at the center point. When the maglev rises, it flips with the maglev. When the maglev rises again, the flap returns to its original position, and there is no water level. (3) There are too many impurities in the water quality of the container, which are adsorbed on the surface of the maglev. Causes the magnetic levitation to drop, and when the magnetic levitation rises, the flap cannot be driven to rotate. (4) The clogging of the liquid phase conduit of water is different, so that the actual water level in the container rises. The maglev does not rise with it. 3. Handling of inaccurate indications of the side-mounted magnetic flap liquid level gauge. (1) Try to make the water level in the container rise or fall not too fast. (2) Magnetic flap, the center of gravity is not at the center point. The manufacturing quality of the side-mounted magnetic flap level gauge does not meet the standard and should be replaced. (3) Unqualified water quality should be washed regularly.
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