LLE Series Liquid Level Sensors Description

The enhanced series of liquid level sensors incorporates a photo-transistor trigger which provides a digital output that denotes the presence or absence of liquid.

The mode of operation is derived from the principle of total internal reflection. An LED and photo-transistor are housed within a plastic dome at the head of the device. When no liquid is present, light from the LED is internally reflected from the dome to the photo-transistor. When liquid covers the dome, the effective refractive index at the dome-liquid boundary changes, allowing some light from the LED to escape. Thus the amount of light received by the photo- transistor is reduced and the output switches, indicating the presence of liquid. This method of liquid level sensing is very fast, and almost instantaneous for water.

LLE Series Liquid Level Sensors Features

• Solid state technology
• Small size
• Digital output
• Pre-wired
• Electrically robust

LLE Series Liquid Level Sensors Benefits
• Accurate, repeatable switching point
• Can be mounted in applications where space is limited
• Microprocessor compatible
• Easy to install, saving assembly time
• Reverse polarity, over voltage, short circuit and transient protection

LLE Series Liquid Level Sensors Typical Applications
• Home appliances
• Spa baths
• Vending machines
• Food and beverage
• Medical
• Compressors
• Machine tools
• Automotive

LLE101101 Liquid Level Sensors Technical Specifications

• Repeatability: ±1mm
• Hysteresis: 2mm (dependent on liquid)
• Material: Polysulphone
• Operating temperature: -40 to 125°C (-40°F to 257°F)
• Storage temperature: -40 to 125°C (-40°F to 257°F)
• Supply voltage: 5 Vdc to 12 Vdc
• Supply current: 5 mA nominal @ +5 Vdc