None of these three values should exceed the maximum capability of the reed switch.īefore installing a float switch in a sewage system, understand these two factors: power connection and application. Multiply these two values together to get the wattage - 1127 watts. For example, a 1/2 horsepower pump operating at 115 volts draws a 9.8 amperes load. Ensure that the wattage, voltage, and amperage do not exceed the max capabilities of the reed switch. Therefore, know the electrical load in the system. Power: In a typical configuration, the pump's power flows through the float switch.Size: Very small float switches are less buoyant and, therefore, less reliable.Therefore, choose a float switch with a PVC or Polypropylene casing. There are three aspects to consider when choosing between float switches for a sewage pump: When the sewage level in the basin drops and the float switch tilts to 45° below horizontal, the magnet slides away from and opens the reed switch, signaling the sewage pump to turn off. When the reed switch closes, an electrical current can flow through it and signal the sewage pump to turn on. In a typical configuration, the reed switch is open until this point. If the sewage level in a basin rises high enough to tilt the float switch 45° above horizontal, the magnet within the switch slides over and operates the reed switch. When the magnet moves away, the contacts revert to their normal state. When a permanent magnet moves over the contacts, they will move to the opposite state (closed to open or vice versa). In a non-magnetized state, these contacts can be touching (normally closed) or not (normally open). A simple reed switch has two metal contacts sealed inside a glass tube. Typically, tether float switches have an electromechanical reed switch and magnet inside. This ensures that the float switch will float above the pump's minimum liquid level and turn on the pump before the sewage overflows the basin. Sewage pump float switch operation principleĪ sewage pump float switch, also known as a tether float switch, fastens to the discharge pipe approximately 100 - 150 mm (4" - 6") above the pump's motor. Check the pump's specifications to see its range of applications. Sewage pumps may be applicable as sump pumps. Sewage pumps in residential applications pump wastewater from bathrooms, kitchens, and other plumbing fixtures into a sewage basin. Sump pumps prevent basements from flooding during non-extreme rainy weather conditions. The difference between sump pumps and sewage pumps is the application. In residential applications, small submersible pumps can handle soft solids up to 2 inches (50 mm) in diameter. Different pumps are applicable for residential, municipal, and industrial systems. This pump sits on or very near the bottom of the sewage basin. A sewage pump transports waste material from a sewage basin to a septic tank or a sewer system.
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