The position of the float switch changes with the rise and fall of the water level. A micro switch opens and closes the circuit, for example, switching a pump on or off or triggering an alarm. One float switch is required respectively for each switching impulse. The float switch is however, equipped with a change-over contact, that is, depending on the electrical connection, the float switch can be used both to empty and fill a tank.
When installing the float switch it is important to see that they can hang freely vertically, that they don’t rest on the base, that they can float without interference from the shaft walls, pipes, and fittings etc. and that they don’t lie directly current.

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water tank float switch installation