Solid state technology Food grade LLE liquid level sensor LLE101000

LLE Series Liquid level sensors - LLE101000   Benefit : • 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     Application : Monitoring fuel levels in aircraft, vehicles, & static equipment
Low level indication of hydraulic fluid in equipment and vehicles
Pump protection
Fluid level control in medical, industrial and domestic products
White goods (washing machines, dishwashers, ice-makers)
Monitoring oil sump and bilge pump fluid levels
Spa baths and hot tubs
Tank and system level control
Printing machinery
Coffee/Tea machines
Machine oil/coolant levels
Off-highway and agricultural vehicles
Milk   Feature :
• Solid state technology
• Small size
• Digital output
• Pre-wired
• Electrically robust   Typical  application • Home appliances
• Spa baths
• Vending machines
• Food and beverage
• Medical
• Compressors
• Machine tools
• Automotive      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.