The items shown are various designs of float switches, a type of liquid level sensor. These devices are used to detect the level of a liquid in a tank, sump, or other container and automatically control connected devices like pumps, valves, or alarms
Specifications
- <p>Key Information</p><p>Function A float switch operates on the principle of buoyancy. A buoyant float moves up or down with the liquid level. This movement physically or magnetically activates an internal switch (commonly a reed switch or microswitch) to open or close an electrical circuit at a specific, pre-set point.</p><p>Types The image displays two primary types:</p><p>Cable-suspended float switches (the majority of the items) are attached to a flexible cable and move freely with the liquid in large tanks or sumps. The angle of the tilt determines the switch activation.</p><p>Stem-mounted float switches (e.g., the black unit on the right, or the small yellow/blue components) constrain the float's movement along a fixed vertical or horizontal stem, often used for more precise, single-point level detection in smaller spaces.</p><p>Applications They are widely used in a variety of residential and industrial applications, including:</p><p>Automatic control of sump and bilge pumps.</p><p>Water level management in tanks for potable water, wastewater, and sewage systems.</p><p>Overfill protection and low-level alarms in industrial processes, the food industry, and HVAC systems.</p><p>Configurations Float switches can be wired as normally open (NO) or normally closed (NC) depending on whether they need to turn a device on or off when the liquid level rises or falls to a certain point. </p>
