LLE Series Liquid level sensors DESCRIPTION The enhanced series of liquid level sensors incorporates a the dome to the photo-transistor. When liquid covers the photo-transistor trigger which provides a digital output that dome, the effective refractive index at the dome-liquid denotes the presence or absence of liquid. boundary changes, allowing some light from the LED to escape. Thus the amount of light received by the photo- The mode of operation is derived from the principle of total transistor is reduced and the output switches, indicating the internal reflection. An LED and photo-transistor are housed presence of liquid. This method of liquid level sensing is very within a plastic dome at the head of the device. When no fast, and almost instantaneous for water. liquid is present, light from the LED is internally reflected from FEATURES BENEFITS Solid state technology Accurate, repeatable switching point Small size Can be mounted in applications where space is limited Digital output Microprocessor compatible Pre-wired Easy to install, saving assembly time Electrically robust Reverse polarity, over voltage, short circuit and transient protection TYPICAL APPLICATIONS Home appliances Spa baths Vending machines Food and beverage Medical Compressors Machine tools Automotive ORDER GUIDE Catalogue Listing Description Standard temperature High temperature (Type 1) LLE101000 LLE101101 Screw In, M12 Thread, Plastic (Type 2) LLE102000 LLE102101 (Type 3) LLE103000 LLE103101 Push In, Plastic (Type 5) LLE105000 LLE105100 Screw In, in, Metal Nickel plated brass LLE205000 LLE205100 Stainless steel LLE305000 LLE305100LLE Series TECHNICAL INFORMATION SpecificationsSpecifications SpecificationsSpecificationsSpecifications Operation mode User defined single point on/off switch (Output is high in air) Repeatability (mm) 1 Hysteresis (mm) 2 (dependent on liquid) Response time Rising liquid level - 50 s Falling liquid level - 1 s max (in ethanol) Response in other liquids dependent on viscosity MMMMMechanicalechanicalechanicalechanicalechanical Mounting Type 1 and 2 - mounted from outside Type 3 and 5 - mounted from inside Termination 250 mm flying leads (180 mm for metal versions) Blue 0 V Red +5 V to +12 V supply Green Output Material Note 1 Polysulphone Dimensions PlasticPlasticPlasticPlasticPlastic MetalMetalMetalMetalMetal LLE101/102/103 SeriesLLE101/102/103 Series LLE205/305 SeriesLLE205/305 Series LLE101/102/103 SeriesLLE101/102/103 SeriesLLE101/102/103 Series LLE205/305 SeriesLLE205/305 SeriesLLE205/305 Series Dome 3,5 mm radius (includes LLE105 Series) Thread M12x1 in BSPT Hex 19 mm 24 mm (See mounting drawings on page 3) EnvirEnvirEnvirEnvirEnvironmentalonmentalonmentalonmentalonmental SSSSStandartandartandartandartandard temperaturd temperaturd temperaturd temperaturd temperatureeeee High temperaturHigh temperaturHigh temperaturHigh temperaturHigh temperatureeeee 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 Humidity As per BS EN60068-2-30 Vibration 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) 2 Ambient IR light limit ( 940 nm) Note 3 10 mW/cm in operation ElectricalElectricalElectrical SSStandartandartandard temperaturd temperaturd temperatureee High temperaturHigh temperaturHigh temperatureee ElectricalElectrical SStandartandard temperaturd temperaturee High temperaturHigh temperaturee 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 25 C 10 mA max. 25 C 40 mA max. 5 Vdc supply 80 C 3 mA max. 125 C 7 mA max. Notes:Notes:Notes:Notes: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. 2 www.honeywell.com/sensing