Dish Washer and Washing Machine Fluid Level Sensing

Dish Washer models are equipped with smaller reservoirs for fluids such as detergents which are essential for their continuous operation. These reservoirs serve different purposes depending on the specific appliance. The fluid level of these reservoirs need to be more than half full.

Washing machines typically contain liquid detergents or fabric softeners to facilitate the cleaning and protection of clothes, while dishwashers utilise water softeners to reduce the hardness of the water supply and prevent stains on dinnerware.

To monitor the fluid levels within these reservoirs, a window is commonly incorporated behind the Dish Washer or Washing Machine doors to allow for manual inspection. Over time, however, these windows can become tainted, making it challenging to accurately ascertain the fluid levels. To address this issue, a small foamed magnet on a spindle can be attached to the reservoir cap, along with a reed sensor integrated into the circuitry of the Dish Washer. This combination enables the precise detection of low fluid levels in the tanks, with highly consistent readings.

When the Dish Washer reservoir nears empty, the reed sensor detects this situation and sends a signal to the processor. This signal activates an LED indicator on the control panel of the Dish Washer or Washing Machine. The user can then top up the reservoirs before the next wash cycle is used. In certain applications, specialized reed sensors are employed to directly switch line voltages without requiring a voltage step-down mechanism.

Application Classification

Applications are classified as Position Sensing, Pulse Counting, Electromagnetic or Relay, Temperature Sensing or Magnet Biasing types. This application is classified as follows and the link gives more information on best practices to help select the most suitable AT band and matching magnet.

Position sensing Type

When an application requires the end position of a movement sensed, or the sensing of a part when it comes into a zone, or when the Continue reading ->

Sep 29, 2024

Recommended Products

The Reed Switches and Sensors used in such applications need to be robust, durable and efficient in meeting a high life expectancy. Our engineers work hard in life testing our products under various conditions, and our intention is to ensure end product durability and life. Although we wouldn’t want to restrict any of our products for use in only certain applications, the recommended products for use in this application are listed below.