Reed Switch Level Sensor Circuit

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.

Reed switch level sensor circuit.

The contacts are usually normally open closing when a magnetic field is present or they may be. In its simplest and most common form it consists of a pair of ferromagnetic flexible metal contacts in a hermetically sealed glass envelope. Magnetic float level sensor is composed of a reed switch a precision resistor and a single chip microcomputer circuit. A reed switch is a sensor that closes the circuit in the presence of a magnetic field.

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. 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. 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. 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.

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