Reed Switch Level Sensor Circuit

Reed sensors can be used in many applications where contactless on off is required.

Reed switch level sensor circuit.

Magnetic float level sensor is composed of a reed switch a precision resistor and a single chip microcomputer circuit. The pcb tracks can be designed in such a way that a full tank gives high resistance and an empty tank gives low resistance or vice versa. The contacts are usually normally open closing when a magnetic field is present or they may be. Reed switches and reed sensors are used along with resistors or special reed sensors with integrated resistor to give out a potentiometric feed back across two outputs as a foamed magnetic float moves along the pcb s length.

Reed switches are sometimes also fitted to the spinning arms of dishwashers to detect when they jam and in the thermal cut offs in electric showers to stop the water. The reed switch is an electrical switch operated by an applied magnetic field it was invented at bell telephone laboratories in 1936 by walter b. When the magnetic force line of the magnetic float acts on a certain position of the liquid level gauge the reed switch in that position is closed. However reed switches can be fragile to use directly hence this module can make it easier to handle and mount the sensor in various applications.

A reed switch is a sensor that closes the circuit in the presence of a magnetic field.