Judgment and Analysis of Three Cases of Blind Zone of Magnetic Flap Level Meter

The blind area of ​​the magnetic flap level gauge is that it cannot measure the liquid level range, which is called the measurement blind area of ​​the magnetic flap level gauge. The blind zone of the magnetic flap level gauge is determined by the design selection or installation process. There is a magnetic float in the main tube of the magnetic flap level gauge (the length of the float is related to the density, temperature and pressure of the medium). Length, when the liquid level is 0, the float must be at the bottom. At this time, the upper end of the float must be flush with the 0 liquid level scale line, and then the correct 0 liquid level is read according to the principle of the magnetic flap liquid level gauge. Therefore, in general, there will be no blind spots in such occasions. 1. There is no blind spot under normal conditions. For example, there is a diesel storage tank on site. The bottom of the vertical tank is 40 cm above the ground, and the height of the tank is 4 meters. To measure the tank's liquid level, choose a side-mounted magnetic flap level gauge. Then the center distance of the magnetic flap level gauge can be selected to be 4 meters, because the bottom of the tank is 40 cm from the ground, so the center opening of the lower flange can be placed at the bottom of the tank. Because even if the length of the float and the length of the drain valve are added, it cannot exceed 40 cm. That is to say, the space from the center of the lower flange down to the ground is just enough to place the magnetic float. When the liquid level drops to 0, the float just slides down to the lower end of the main pipe of the level gauge. This time there is no blind spot. It should also be noted that the 40 cm distance mentioned above is the insurance distance calculated according to the density, pressure and temperature of the medium measured on site, including the length of the float and the operating space of the drain valve of the level gauge. 2. There is a blind spot at the bottom of the instrument. Understand the above example, then in the opposite situation, when the bottom of the tank (or the installation center of the flange at the lower end of the liquid level gauge) is close to the ground or the distance from the ground is very short. Then the lower flange must move up at this time, because the liquid level must always be measured to the 0 scale liquid level, then the upper end of the float must be flush with the 0 scale line, then below the 0 scale line (that is, the center of the lower flange) to At least a little more length of the main body pipe (the length of the float) under it. At this time, due to the principle that the distance between the centers of the flanges at both ends of the magnetic flap level gauge is equal to the measurement range, the blind area is the distance between the center of the lower flange and the bottom of the tank. 3. There is a blind spot on the top of the instrument for the same reason. If there are obstacles above the top of the tank, the design should also be considered according to the above two examples. Because when the liquid level is full scale, for example, the height of the liquid level rises to 4 meters, if the liquid level of 4 meters is to be measured, then the bottom end of the magnetic float must be higher than the 4-meter liquid level scale line. So there must be room for upside. If there is a space obstacle above the top of the tank, there will also be a blind spot. Of course, if the customer chooses the zero scale line at this time, that is, the center of the opening at the lower end moves up, there will be no blind spot. Because the client threw this blind spot away. For example, originally the tank was only no more than 10 cm away from the ground. This situation is still far from the standard of at least 30 cm from the ground. This 10 cm is definitely far from the length of the zero mark. Then, after the center of the opening at the lower end is moved up by 20 cm, at most, the low liquid level on site is at 20 cm. It does not matter if the liquid level below 20 cm cannot be measured by the customer. In this case, there is no blind spot. Of course, many tank areas now have this bottom space. It should be noted that the three cases are based on the side-mounted magnetic flap level gauge, which will only appear when we choose the side-mounted magnetic flap level gauge. The so-called blind spot. For the top-mounted magnetic flap level gauge with the same measurement principle, there is no blind zone under normal circumstances. Due to the consideration of installation space and site safety, generally speaking, the top-mounted magnetic flap level measurement The range is limited, and it is not as long as the side-mounted magnetic flap level gauge.
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