Optical Liquid Level Sensor

Optical Liquid Level Sensor

An optical liquid level sensor detects the presence or absence of a liquid at a specific point without moving parts. It typically uses an infrared LED and a photo-detector inside a sensing head. When the sensor tip is in air, light is reflected differently than when the tip is immersed in liquid. The change in received light alters the electrical output, allowing the sensor to signal whether the liquid has reached the detection point. Optical sensors are compact, reliable, and suitable for automation and safety systems where precise liquid presence detection is needed, such as pump control, tank monitoring, and fluid handling.

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Features

• Non-contact or minimal contact sensing (inside housing)
• No mechanical moving parts
• Fast response to liquid presence
• High reliability and long operating life
• Compact and space-efficient design
• Works with various liquids (depending on refractive index)
• Digital output for easy interfacing
• Low power consumption
• Works with microcontrollers and control systems
• Can be housed in waterproof casing

Applications

• Water level detection in tanks and reservoirs
• Pump control automation
• Overflow or dry-run protection
• Beverage dispensers and fluid dispensers
• Process control in manufacturing
• Portable liquid level detectors
• Medical and laboratory liquid sensing
• Smart home and IoT water systems
• Automotive coolant or washer fluid sensing