LLE Series Liquid Level Sensors - LLE101101

  • LLE Series Liquid Level Sensors
  • LLE Series Liquid Level Sensors
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• 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

  • Model Number: LLE101101
  • Data Sheet: Date Sheet File
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Product Specification

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

LLE Series Liquid Level Sensors Order Guide

Catalogue Listing

Standard temperature High temperature
Screw In, M12 Thread, Plastic
(Type 1)
LLE101000 LLE101101
(Type 2)
(Type 3)
Plus In, Plastic
(Type 5)
Screw In,½ In, Plastic
Nickel plated brass LLE205000
Stainless Steel

LLE Series Liquid Level Sensors Technical Specifications


Operation mode User defined single point on/off switch (Output is high in air)
Repeatability (mm)
Hysteresis (mm)
2 (dependent on liquid)
Response time

Rising liquid level - 50 μs
Falling liquid level - 1 s max (in ethanol)
Response in other liquids dependent on viscosity

Type 1 and 2 - mounted from outside; Type 3 and 5 - mounted from inside

250 mm flying leads (180 mm for metal versions)
Blue  0 V                
             Red  +5 V  to +12 V supply
Green  Output        
Material [Note 1]




LLE101/102/103 Series
LLE205/305 Series
3,5 mm radius (includes LLE105 Series)
19 mm
24 mm 
Standard temperature
High temperature
Operating temperature (°C)
-25 to 80 (-13°F to 176°F)
-40 to 125 (-40°F to 257°F)
Storage temperature (°C)
-30 to 85 (-22°F to 185°F)
-40 to 125 (-40°F to 257°F)
Thermal testing
As per BS EN60068-2-33
As per BS EN60068-2-30
As per BS EN60068-2-6 Part S3: 1996
Mechanical shock
As per BS EN60068-2-27 Part 2 Ea: 1987
Pressure range (bar)
0 to 5 (plastic housing) [Note 2]
0 to 25 (metal housing)
Ambient IR light limit (@ 940 nm) [Note 3]
10 mW/cm in operation
Standard temperature
High temperature
Supply voltage (Vcc)
+5 Vdc to +12 Vdc ± 5 %
Supply current (mA)
15 mA nominal @ +5 Vdc
5 mA nominal @ +5 Vdc
Output sink current [Note 4]
@ 5 Vdc supply
@ 25°C 10 mA max.
@ 25°C 40 mA max.
@ 80°C 3 mA max.
@ 125°C 7 mA max.

[Note 1] Material compatibility information available on request.
[Note 2] Threaded sensors only.
[Note 3] For other ambient light environments the user should test the sensor under application conditions to verify compatibility.
[Note 4] The output is intended as a TTL compatible output signal, for interfacing to logic systems. For interfacing with other types of circuitry an appropriate buffer circuit must be used.

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