An IR (Infrared) sensor in a washing machine is used to detect the water level and ensure proper filling of the washing machine's drum. The sensor works based on the principle of reflecting and receiving infrared light.
Here's how it typically works:
Emitter and Receiver: The IR sensor consists of two main components: an infrared light emitter and an infrared light receiver. The emitter sends out an infrared beam towards the bottom of the washing machine's tub.
Empty Tub: When the washing machine's tub is empty or has a low water level, the infrared beam emitted by the emitter is not obstructed. It travels freely and reaches the receiver without interruption.
Water Presence: As the washing machine starts filling with water, the water level rises inside the tub. When the water level reaches a certain height, it obstructs the path of the infrared beam. The water acts as a barrier and prevents the infrared light from reaching the receiver.
Detection and Control: The receiver detects the presence or absence of the infrared light. If the receiver receives the infrared light, it indicates that the tub is not filled with water up to the desired level. The washing machine's control system then continues to fill the tub with water until the sensor detects that the infrared light is interrupted, indicating the water has reached the desired level.
Regulating Water Level: The washing machine's control unit uses this information to regulate the flow of water into the tub. Once the infrared sensor detects the water level is adequate, the machine stops filling with water, and the washing process can begin.
The IR sensor ensures that the washing machine doesn't overfill with water, preventing potential leaks and saving water during each wash cycle. It is a straightforward and effective way to monitor the water level inside the washing machine and maintain the right water-to-laundry ratio for optimal washing performance.