What does flow switch do for VFD inverter pressure booster pump?

Normally, a traditional VFD / VSD Inverter Constant Pressure Booster Pump only count on the pressure sensor to determine whether to start or stop. However, with only a pressure sensor, a VFD / VSD Inverter Constant Pressure Booster Pump might have problem to stop running when the water usage is small and be slowly shouted down. In this case, a VFD / VSD Inverter Constant Pressure Booster Pump might still running at very low speed but cannot fully stop. Moreover, if the water usage is as low as 3 or 5 liters per minute, a VFD / VSD Inverter Constant Pressure Booster Pump with only pressure sensors might not run stably.

However, a VFD / VSD Inverter Constant Pressure Booster Pump with a pressure sensor and also a flow switch can fully stop running when water usage is small and be slowly shouted down. Moreover, even the water usage is as low as 3 liters per minute, a VFD / VSD Inverter Constant Pressure Booster Pump equipped with a flow switch can still run very stably.

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