Reed Switch Level Sensor Circuit

The contacts are usually normally open closing when a magnetic field is present or they may be.

Reed switch level sensor circuit.

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. 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. In its simplest and most common form it consists of a pair of ferromagnetic flexible metal contacts in a hermetically sealed glass envelope. 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.

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. Reed sensors can be used in many applications where contactless on off is required. Magnetic float level sensor is composed of a reed switch a precision resistor and a single chip microcomputer circuit. How to use magnetic sensor and reed switch in projects a magnetic field from an electromagnet or a permanent magnet will cause the reeds to attract each othe.

Some fluid level sensors in clothes washing machines and dishwashers use floating magnets that bob up past reed switches to switch off the valves when enough water is inside.