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.
Today, there are a huge variety of different methods for controlling pumps, 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 actuator.
The float switch is installed in tanks, storage tanks, tanks, wells, it is designed to control industrial and domestic pumps for water supply, drainage and sewerage. Several such floats can be installed in one tank, and each will perform its own function: control of the main pump, auxiliary unit, as an emergency overflow sensor. The use of such instruments in datasystems provides
reliable protection of pumping equipment, primarily from operation in the prohibited "dry run" mode. Also, when filling various containers, switches provide protection against overflows. There are two types of float switch: 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 devices are used for sewerage, drainage, rainwater, etc.
Structurally, the float switch is a sealed floating plastic box, inside which is placed a steel ball and an electrical 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. The moisture resistant 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 mechanical stress in the wire. The insulated cable entry cavity is filled with polymer resins that prevent moisture penetration. Float switch thanks to the thermal and chemical resistance of the body and cable sheath,
Consisting of thermoplastic rubber, it has high impact resistancefecal water, uric acid, alcohols, gasoline, liquid oils, fruit acid, etc. most do not affect the buoyancy of the device.
How much does a float switch cost? The price of such a device is quite low. The simplest switches will cost about 300-400 rubles. However, prices for some models can reach several thousand rubles.
