A mechanical adjustable pressure switch applies a spring-triggered piston sealed by a diaphragm and rubber O ring. Generally, The spring is the opposing force to the inlet pressure and the spring's pretension is adjusted with a male stud screw by a female screwdriver. People preset a targeted high pressure on the male-threaded stud inside the pressure switch which is subjected to trigger the off switch, and a preset low-pressure value to trigger the switch. For example, in the hot pipeline of an HVAC system, when the compressed high-temperature high-pressure air comes and the pressure rises to an exact value which will trigger the off switch, the spring pretension directly correlates to the pressure at which the switch makes an electric contact. When the pressure drops, the switch resets to its original state and turns on the switch. The low-pressure switch and the high-pressure switch in the HVAC system are two types of basic refrigeration switches in a typical high-taste residential system.
The mechanical pressure switch is better suited for handling high voltages and amperages than an electronic pressure switch. They can be used to make a contact change for an increase or decrease in pressure.
HVAC, air compressor blowers, gas cylinders, air pumps, generator sets, off-road vehicles, compressors, wafer ovens, process equipment, flow control devices, pumps, wastewater, heating and cooling systems, and numerous other applications from LEFOO pressure control across industries.
An electronic pressure switch is controlled by the charging signal generated from a pressure sensor, Which is proportional to the pressure. Thus, not only is it identified whether the defined switch point has been reached, but the actual measured pressure is transmitted. Electronic pressure switches often feature a display from which the measured pressure can be read, digital displays and switching buttons also offer adjustable settings. Switch points, pressure output signals can be individually adjusted to suit the remote monitor control application.
The pros of electronic pressure switches are precise measurement, intelligent remote controllable, The con is the price is much higher than mechanical pressure switch and not suitable for extremely high-temperature high-pressure measurement and applications.
Pressure: It must be able to withstand the maximum working pressure. A diaphragm design works well for vacuum and low-pressure applications. For high-pressure applications, use a piston design.
Temperature: It must be able to work well within its maximum and minimum temperature range.
Repeatability: Repeatability, or accuracy, is the ability of the device to accurately switch back to the same set point for every repetition. The range of accuracy required will determine the selection of the pressure switch for your application. Diaphragm designs generally provide more accuracy than piston designs.
Electronic pressure switches are suitable for automated and controlled equipment systems that require programmable function, digital display, flexibility, accuracy, ingress protection, and stability. Common media used with pressure switches are Hydraulic oil, Heating oil, Turpentine, Petrol/gasoline, Air. The automatic pump control switch for water pump applied to the water system will automatically start and stop the water pump according to the set pressure value.
The Lefoo group was launched in 2000, Lefoo manufacture pressure switches for an extensive range of industries include -10000 pa to 10000 pa, and from 0~200 bar. Such as HVAC, refrigeration, air, compressor and pump pressure, automatic water pump, vacuum, steam, differential pressure, float, miniature and vacuum, high pressure, level, and digital switches and sensors to meet the utmost needs of industrial application and harsh environment. Each LEFOO pressure switch is high accuracy with numerous pressure ranges, flexible for any connections.
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