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The float level switch utilizes a magnetic float that moves up or down with the liquid level, causing a reed switch chip at a predetermined position within the sensor tube to activate, thereby generating a signal indicating the opening (closing) of the contacts. One or more reed switches are placed inside a sealed, non-magnetic tube; this tube is then passed through one or more floating balls that are hollow and contain ring magnets inside. The rise or fall of the liquid causes the floating balls to move up and down as well, which in turn causes the reed switches in the non-magnetic tube to either close or open, thereby generating a switch signal. Features of float level switches: 1. Wide range of applications and various installation options ； 2. Multi-point control ； 3. Passive devices feature stable and reliable performance, as well as strong interference resistance. They have a simple structure, are easy to install, and require low maintenance costs ； 4. A variety of materials can be selected, suitable for various uses ； Methods for calibrating a float level switch: 1. Before installing the float level switch, it is only necessary to recalibrate the water level line. It’s not possible to adjust the switch itself. At this point, use a multimeter to check the switch status; near the water line, it will turn on and off in accordance with the level of water, which indicates that there is no problem. Just make sure it is at the same water level as the thermal equipment during operation. Take the level switch of SOR, for example; a water level line is usually marked on the wall of the tank. When we submerge the switch in the water tank, it gradually sinks, causing the water surface to move closer to that marked line. As it gets closer, a sound is heard indicating that the microswitch is activating. 2. It should be noted that devices such as the high-pressure heater level switch operate at high temperatures, and the water temperature inside them is also high ； The density of hot water is less than that of room-temperature water. Therefore, the action line of water at room temperature is lower than the switch indication line. 3. The low liquid level alarm is connected to the normally closed (NC) terminal, while the high liquid level alarm is connected to the normally open (NO) terminal. These types of switches are not difficult to install. A level switch itself is equipped with two or more pairs of microswitches, which provide two pairs of normally open contacts and two pairs of normally closed contacts; in practice, it is used for \"triggering an alarm\".