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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
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Catalogue Listing |
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Description |
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Standard temperature |
High temperature |
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Screw In, M12 Thread, Plastic |
(Type 1) |
LLE101000 |
LLE101101 |
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(Type 2) |
LLE102000 |
LLE102101 |
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(Type 3) |
LLE103000 |
LLE103101 |
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Plus In, Plastic |
(Type 5) |
LLE105000 |
LLE105100 |
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Screw In,½ In, Plastic |
Nickel plated brass |
LLE205000 |
LLE205100 |
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Stainless Steel |
LLE305000 |
LLE305100 |
LLE Series Liquid Level Sensors Technical Specifications
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Specifications |
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Operation mode |
User defined single point on/off switch (Output is high in air) |
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Repeatability (mm) |
±1 |
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Hysteresis (mm) |
2 (dependent on liquid) |
Response time
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Rising liquid level - 50 s Falling liquid level - 1 s max (in ethanol) Response in other liquids dependent on viscosity |
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Mechanical |
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Mounting |
Type 1 and 2 - mounted from outside; Type 3 and 5 - mounted from inside |
Termination
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250 mm flying leads (180 mm for metal versions) |
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Blue 0 V |
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Red +5 V to +12 V supply |
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Green Output |
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Material [Note 1] |
Polysulphone |
Dimensions
Dome
Thread
Hex
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Plastic LLE101/102/103 Series |
Metal LLE205/305 Series |
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3,5 mm radius (includes LLE105 Series) |
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M12x1 |
½ BSPT |
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19 mm |
24 mm |
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Environmental |
Standard temperature |
High temperature |
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Operating temperature (°C) |
-25 to 80 (-13°F to 176°F) |
-40 to 125 (-40°F to 257°F) |
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Storage temperature (°C) |
-30 to 85 (-22°F to 185°F) |
-40 to 125 (-40°F to 257°F) |
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Thermal testing |
As per BS EN60068-2-33 |
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Humidity |
As per BS EN60068-2-30 |
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Vibration |
As per BS EN60068-2-6 Part S3: 1996 |
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Mechanical shock |
As per BS EN60068-2-27 Part 2 Ea: 1987 |
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Pressure range (bar) |
0 to 5 (plastic housing) [Note 2] 0 to 25 (metal housing) |
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Ambient IR light limit (@ 940 nm) [Note 3] |
10 mW/cm in operation |
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Electrical |
Standard temperature |
High temperature |
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Supply voltage (Vcc) |
+5 Vdc to +12 Vdc ± 5 % |
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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. |
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@ 80°C 3 mA max. |
@ 125°C 7 mA max. |
Notes:
[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.