Technical Specifications:

• Sensor Type: Membrane-actuated pressure switch
• Pressure Range: 0 to 300 mbar (0 to 30 kPa)
• Switch Points: 4 preset levels (typically: empty / low / medium / high)
• Electrical Rating: 250V AC, 6A (resistive load)
• Connection: 4-pin connector (common + 4 switch outputs)
• Operating Temperature: 0°C to +60°C
• Pressure Tube Connection: 4mm ID silicone hose

Functional Features:

• 4-level water detection for precise fill control
• Fail-safe design — default to empty if tube disconnected
• Adjustable switch points via mechanical lever positions
• Diaphragm membrane for reliable long-term operation

Performance Parameters:

• Switch Accuracy: ± 10 mbar per level
• Response Time: < 200ms from pressure change to contact actuation
• Cycle Life: ≥ 100,000 operations
• Pressure Tube Length (Supplied): 1.2m silicone hose
• IP Rating: IP40

Material Composition:

• Housing: ABS engineering plastic (UL94 V-0 rated)
• Diaphragm: Silicone rubber membrane
• Contacts: Silver alloy (AgNi) with gold flash plating
• Pressure Tube: Food-grade silicone, 4mm ID × 6mm OD
• Fasteners: Stainless steel screws

Structural Features:

• Compact rectangular housing with 4-pin connector on one side
• Pressure port on bottom for tube connection
• 4 adjustable lever arms for setting switch points
• Mounting bracket with 2× screw holes for chassis attachment

Working Principle:
Air pressure in the silicone tube rises proportionally with water level in the drum (hydrostatic principle: P = ρgh). This pressure acts on the silicone diaphragm inside the switch housing. When pressure reaches each preset threshold, the diaphragm deflects and actuates the corresponding micro-switch contact, sending a signal to the control board. The board uses these signals to open or close the water inlet valve.

Key Advantages:

• Precise 4-level detection for optimized water usage
• Mechanical reliability — no electronics to fail
• Easy adjustment of water levels via lever positions
• Universal compatibility across AEG washer platforms

Applicable Industries:

• Washing machine OEM manufacturing
• Appliance repair and service
• Aftermarket parts distribution

Installation Requirements:

• Connect pressure tube to drum base port — ensure airtight seal with hose clip
• Route tube to switch — no kinks or sharp bends (minimum bend radius 30mm)
• Mount switch to chassis with 2× M3.5 screws
• Connect 4-pin harness — verify pin 1 = common

Usage Precautions:

• Blow through tube before installation to verify it is clear
• Do not over-tighten hose clips — may restrict airflow
• If machine overfills or underfills, adjust switch lever positions
• Replace tube annually as preventive maintenance — silicone degrades over time