low-pressure switch in a water purification system, especially in reverse osmosis (RO) systems, is a safety device designed to monitor and control the water pressure in the system. It prevents the RO pump from operating when the water pressure drops below a certain threshold, protecting the system and ensuring efficient performance.

Functions of a Low-Pressure Switch:

1. Pump Protection:
   • Automatically shuts off the pump if the inlet water pressure is too low.
   • Prevents the pump from running dry, which can cause damage or overheating.
2. System Efficiency:
   • Ensures the RO system operates only under optimal pressure conditions, improving water flow and filtration efficiency.
3. Automatic Operation:
   • Works in conjunction with other components, like high-pressure switches and solenoid valves, for fully automated RO systems.

Key Features:

1. Pressure Sensitivity:
   • Typically set to activate below 5–10 psi (varies by system).
   • Can be adjusted in some models for specific system requirements.
2. Compact Design:
   • Small, lightweight, and easy to install within the RO system’s plumbing.
3. Material:
   • Made of durable, water-resistant materials like plastic or metal to withstand pressure and moisture exposure.
4. Electrical Connection:
   • Usually connected to the RO pump circuit to control its operation.