Pressure switches
Using Pressure Switches for Pump Control
A pressure switch is a device used to control a pump by measuring the pressure in the pipework. When the pressure falls below a defined value, known as the cut-in pressure, the pressure switch activates the pump to restore the pressure. Once the desired pressure has been reached, the pressure switch switches the pump off again at the cut-out pressure. This automatic control helps the pump operate efficiently while maintaining a constant water pressure.
In domestic applications, pressure switches are often used in home gardens, for example for irrigation. By monitoring and controlling the operation of the garden pump, the pressure switch ensures that the pump only runs when necessary. This not only saves energy, but also reduces costs by preventing the pump from running for longer than required.
Another benefit is protection against dry running. If the pressure in the system drops too far because there is no more water available, the pressure switch prevents the pump from running dry, which can help prevent damage to the pump.
By regularly monitoring and controlling your water pump with a pressure switch, you can extend the service life of the pump, use your water resources more efficiently and reduce costs.
Types of Pressure Switches
Mechanical Pressure Switches
Mechanical pressure switches work by converting the applied pressure into mechanical movement, which in turn actuates a switching contact. These switches do not require an external power supply, as the mechanical pressure itself generates the force required to initiate the switching process. Due to their design, mechanical pressure switches are particularly robust and well suited to applications requiring greater hysteresis values, meaning a larger difference between the cut-in and cut-out points. This makes them ideal for environments with fluctuating pressure conditions or applications where high reliability and a long service life are required.
Electronic Pressure Switches
Unlike mechanical pressure switches, electronic pressure switches offer greater precision and flexibility when monitoring pressure. They use electronic sensors to detect the pressure and convert it into an electrical signal. Electronic pressure switches allow the switching points to be adjusted more precisely and respond more quickly to changes in pressure, making them particularly suitable for dynamic pressure systems. They also often include additional functions, such as dry-run protection, which protects the system against damage caused by a lack of water pressure. Due to their greater accuracy and additional functions, electronic pressure switches are preferred for applications that require precise pressure monitoring and fast response times.
Important Considerations
When Buying a Pressure Switch for Pump Control When purchasing a pressure switch, it is important to ensure that its performance is compatible with that of your pump. The switching pressure, meaning the pressure at which the switch activates or deactivates the pump, must correspond to the specifications of your pump. Make sure that the pressure switch only operates above the specified minimum pressure and that the maximum operating pressure is not exceeded. This helps prevent malfunctions.
Another important factor is the maximum switching capacity of the pressure switch. This determines the maximum pump power for which the pressure switch can function correctly. Check the technical specifications of the pressure switch to ensure that it meets the requirements of your pump.
Safety aspects also play a crucial role. The pressure switch should be waterproof to prevent damage caused by moisture. An integrated non-return valve is useful for preventing water from flowing back, which helps stabilise system operation. Dry-run protection is also important, as it protects the pump against damage that can occur when it runs without water.
Finally, the pressure switch should be easy to install. Straightforward installation saves time and effort and ensures that the system is ready for operation quickly. Zehnder Pumpen offers user-friendly models that enable fast and simple installation.
Request Pressure Switches for Pump Control from Zehnder Pumpen
Optimise your pump’s performance with the advanced pressure switches for pump control from Zehnder Pumpen. Our products are made in Germany, so you can rely on their outstanding performance and quality. Use our automatic pump controllers to control pumps in rainwater harvesting, water supply and irrigation systems in residential applications. Discover our other products, including level controllers and variable speed controllers.