Float switch: designation, description

The float switch for electric pumps is the cheapest and easiest method of protection against "dry running" of pumping equipment. Such a switch is also called a float. To date, there are a lot of different methods of pump management, but the most popular, due to its simplicity, is the float switch. The main advantage of such a device is that the floats can be used simultaneously as a water level sensor and a pump control actuator.

The float switch is installed in tanks, storage tanks, tanks, wells, it is designed to control industrial and domestic pumps for water supply, sewerage and sewerage. Several such floats can be installed in one tank, each of which will perform its function: control of the main pump, auxiliary unit, as an emergency sensor of the overflow sensor. The use of such devices in these systems provides Reliable protection of pumping equipment primarily from work in the prohibited mode of "dry running". Also, when filling different capacities, the switches provide protection against overflows. The float switch is of two types: light (IGD2 / S, IGD5 / S, IGD10 / S) and heavy (MAC / 3, MAC / 5-5S). Basically, light devices are used in sewerage and water supply systems, and heavy ones are used for sewage, drainage, rain drains, etc.

Structurally the float switch is a sealed floating plastic box, inside of which is placed a steel ball and an electric switch. When the position of the float changes, the ball closes or opens the switch contacts. The float switch goes on sale with a wire length of two to ten meters, depending on the type of device. Moisture-proof cable has three cores. Most often they have the following colors: blue and brown (from normally closed and open contacts), as well as black (common). The cable outlet is sealed with a mechanical seal, it is equipped with a reliable mechanism for relieving the mechanical stress in the wire. The insulated cavity of cable entry is filled with polymer resins, which exclude penetration of moisture. The float switch due to the heat resistance and chemical properties of the housing, as well as the cable sheath, Consisting of thermoplastic rubber, has a high resistance to the effects of fecal water, uric acid, alcohols, gasoline, liquid oils, fruit acid, etc. The plastic surface of the body has no pores, thus eliminating the possibility of various contaminants sticking to it, and paper, Sand and other solid elements slip from it and thus do not affect the buoyancy of the device.

How much does the float switch cost? The price of such a device is rather low. The simplest switches will cost about 300-400 rubles. However, prices for some models can reach several thousand rubles.