1. Safety Standards: GB 4706.1 (Safety of Household and Similar Use Electrical Appliances Part 1: General Requirements) and GB 4706.24 (Specific Requirements for Washing Machines) in China are mandatory standards. They stipulate safety such as electrical insulation, water resistance, and fire resistance, and sensors, as part of the circuit, must comply.

2. Performance Standards: GB/T 428 (Domestic and Similar Use Electric Washing Machines) in China is a recommended performance standard. It mainly focuses on the overall washing ratio, water consumption, noise, energy consumption etc., and the accuracy and stability of the water level sensor are key to achieving performance indicators such as low water consumption and high washing ratio. Although the standard does not directly test sensor itself, its performance must support the overall machine to meet the standard.

3. Washing Machine Water Level Switch Testing Equipment: Each workstation can be connected to the water sensor through flexible hoses. The quick connection terminal is connected to the product's terminal, and the wiring method is suitable for three-pin electromagnetic water level sensors and two- mechanical sensors. By simulating a certain pressure of air pressure, the signal acquisition and on-off signal judgment of the two-pin mechanical water level sensor and the three-pin water level sensor are carried out. Set different output pressure values to achieve low-pressure and high-pressure tests for water level sensors. Set the test times and on-off cycles judge whether the water level sensor meets the design and use standards in long-term pressure tests. Washing machine testing

4. Each test workstation uses quick clamping to fix samples and uses SMC electronic proportional valves with adjustable air pressure of 0-200Kpa to adjust the simulated air pressure. Use the set low water level and high level to carry out 0-30 times/minute high-frequency on-off tests. And the PLC control software detects the action ON/OFF state of the water sensor in real time. Record the relevant aging test times and the qualified and unqualified judgment of the product. Relevant test data can be exported through USB