Float
Sensor
When the magnetic field of permanent
magnet inside the float is moved into to the proximity of the reed
switch inside the stationary stem, the reed switch "snaps" the
contact together and closes the electrical circuit. When the magnetic
field is moved away from the reed switch, the reed switch does
not touch. The circuit is open.
Flotation sensor wiring is pretty straightforward. There are only
two wires. The switch in the sensor is normally open. To make an
effective NPN switch one wire is connected to ground and the other
to the input of the control. To make a PNP connection, one wire
is placed to the supply voltage (usually +24VDC) and the other
wire is connected to the control input. It is strongly advised
not to wire AC or voltages higher than 24V to the sensor because
of the presence of liquids, an electrical hazard might exist
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