1. High&Low pressure switches protect RO Booster Pump, High Pressure Pump, RO membrane, and other system components from damage due to high or low pressure.
2. Operate automatically when used with a system controller.
Low pressure switches
RO system is a pressure-driven process, small household RO units will theoretically operate in a very low pressure (down to 35psi, according to some membrane manufacturers, but the reality is, you won’t get a lot of water and the product water quality will be compromised if the RO unit runs below 45psi.) Low inlet pressure makes the unit produce more rejected water, produce less drinking water, fill the storage tank more slowly, and produce lower quality water. Ro units run well on typical municipal water pressure of 60psi, but they run even better with a small pump to boost the pressure up to 80psi or higher.
The low pressure switch is typically for protecting the pump from a low pressure situation such as loss of feed water. It would be located between the pump and the tap or water pipe. It will turn off the pump in case of water stops coming from main supply system of if the pressure is very low for functioning of the RO. Generally, the low pressure switch is set at 0.25Mpa to turn on the booster pump and at 0.1Mpa turn off the pump.
High Pressure switches
The high pressure switch is designed to cut the pump off when a set pressure is reached and are generally used in either a pressure tank equipped system or an open tank system using a float valve. This would be located as close as possible to the pressure tank or the float valve. In this situation, it keeps the system maximum pressure from being reached and keeps the pump from running continuously.
When water pressure tank is full of water, High Pressure Switch will automatic power down system and will be kicked off when insufficient pressure/water occurred (pressure down 0.06Mpa). General pressure setting for High Pressure Switches is 0.25Mpa±0.03Mpa (about 40Psi).
