Washing Machine Filling Slowly or Never Stopping, Level Judgement Off and Rinsing Poor? NL-WIF-6 Washing Machine Inlet Valve & Level Sensor Frequency Correlation Bench Runs Six Stations (level sensor life test)

Washing machines filling slowly or never stopping, or judging the water level wrongly so rinsing is poor or the tub overflows, are a recurring class of service problem. The cause is usually decaying inlet-valve flow, drifting frequency of the pressure-type level sensor, and mismatched correlation between the two. Incoming inspection tends to test the valve and the sensor separately, so the actual filling and level-judging behaviour of the pair is not measured — the problem surfaces only in the field.

What the NL-WIF-6 washing machine inlet valve and level sensor frequency correlation bench measures

• Six stations in parallel, inlet-valve flow and response testing: flow and open/close response measured point by point at different supply pressures, with flow-decay trends output automatically (sharing the pressure-generation and frequency-acquisition module of our level sensor life test machines)
• Level sensor frequency-versus-water-level calibration: scanning pressure against output frequency point by point, with linearity and hysteresis computed automatically and drift out of tolerance judged NG
• Valve–sensor correlation testing: closed-loop running to the machine’s fill programme, assessing level-judgement consistency and fill-time deviation
• Cycling endurance: inlet valve and sensor run together for tens of thousands of cycles, tracking long-term flow and frequency drift
• Reproduction and statistics of failure modes such as never stopping, overflow and low level
• Barcode and batch binding, with raw data exported per unit for the record

Applicable standards

GB 4706.1 (household appliances – general safety), GB 4706.24 (washing machines – safety), GB/T 4288 (electric washing machines for household and similar use – performance), IEC 60335-2-7 (washing machines – safety) and IEC 60730-2-8 (automatic electrical controls – water level controls), with GB/T 2828 sampling; acceptance criteria can follow the customer's standard.

Stations and throughput

Six stations running 24/7 bring the hours spent hooking up a basin to measure flow and pumping air to read frequency down to minutes per unit, while correlation calibration and cycling endurance are completed within weeks — so incoming lots and end-of-line machines can be sampled batch by batch, stopping fill faults and level misjudgement before shipment.

Manufacturer

Guangdong Endurance Electronic Equipment Co., Ltd. — a non-standard testing equipment manufacturer of washing machine inlet valve and level sensor frequency correlation benches, pump test bench and pump performance test systems, level sensor life test machines, dishwasher test equipment and washing machine test equipment.

Keywords: pump test bench, pump performance test, level sensor life test, dishwasher test equipment, washing machine test equipment.