How Magnetic Reed Liquid Level Sensors Work
The aim of a float switch is to turn on and off a circuit as the level of liquid increases or decreases. Many float switches are of the type “normally closed,” implying the two wires passing from the upper of the switch through a circuit if the float is at its low point, sleeping on its lowest pin or stop.
Many float switches apply a magnetic piece switch to turn on or off the circuit. The metal piece is enclosed in a glass tube, that is covered by a plastic or stainless steel piece with glue.
If the magnet approaches near to the two contacts, they pull together and touch, letting current to pass through. If the magnet is relocated away, the contacts lose its magnetic property and isolated, breaking the circuit.
In a float switch, the magnetic piece switch is airtight wrapped in a stem, mainly regularly made from plastic or stainless steel. The float encloses a closed magnet, that transports up and down the distance of the stem as a liquid level increases and decreases.
The operation can typically be overturned by taking away the bottom pin from the switch, overturning the float and changing the clip. If this change is complete, the switch circuit will turn on while the float is relaxing on the bottom pin and shut when the float increases.
Correctly applied, float switches may provide millions of on/off rounds, for years of a reliable process. Letdowns are normally possible due to several reasons such as overloading or regularly triggered by spiking current.