Banner Engineering WORLD-BEAM® QS30H2O Opposed Mode Water Sensors provide an innovative solution for efficiently detecting water-based liquids in clear, frosted, colored or even partially opaque bottles or containers. QS30 Water Sensors use a specially designed 1450 nm sensing beam, which is inherently absorbed by water, to make the previously challenging clear bottle/clear water combination detection a high-contrast application, enabling reliable detection. In addition, QS30 Water Sensors have high excess gain to “burn through” colored glass, labeled/decorated bottles and translucent milk jugs to detect the liquid contents.

QS30 Water Sensors consist of an emitter and a choice of either a low-power receiver, ideal for detecting water in clear bottles, or a high-power receiver, designed to effectively receive the emitted beam through partially opaque containers. In addition, the 13 mm diameter beam can be shaped using one of the three apertures that come standard with each emitter/receiver pair. The aperture reduces excess gain and narrows the sensing beam, facilitating accurate detection of water in vials, test tubes or other small vessels and containers. Pricing for a QS30 Water Sensor emitter/receiver pair begins at just $285.

“At a wavelength of 1450 nm, water absorbs about 1,000 times more energy than at visible wavelengths, allowing the QS30 Water Sensor to deliver reliable results in two ways,” said Dennis Smith, technical marketing engineer at Banner. “When the bottle is clear, the energy absorption of the water creates high contrast between the water and the bottle. For example, a clear PET plastic bottle may attenuate about 5% of the light emitted, while the water attenuates about 95% of the light energy, allowing for simple discrimination between an empty or full bottle. The sensor also has the optical power to ‘burn through’ many partially opaque glass and plastic containers, but not through the liquid contents.” Smith adds, “This light-blocking technique delivers accurate sensing at a cost-effective price.”

Applications. The unique design and robust ability of the QS30 Water Sensor make it an exceptional solution for demanding sensing applications, including:
Fill level inspection in bottling applications
Test tube liquid detection
Food packaging inspection and verification
The QS30 Water Sensor is a member of Banner’s WORLD-BEAM QS30 product line, an exceptional family of easy-to-use sensing products with a wide array of sensing modes and sizes, and delivered in a standard 30 mm housing. The sensor’s rich feature set also includes the following:
Offers compact design and mounting versatility
Features rugged IP67 housing for harsh environments
Provides easy-to-read operating status indicators
Delivers excellent noise immunity and crosstalk avoidance
Resists environmental contamination from moisture and dirt
Includes bipolar NPN/PNP outputs, with a choice of light or dark operate models


• Supply VoltageEmitter:10 to 30V dc (10% maximum ripple) at less than 80 mA Discrete Receiver:10 to 30V dc (10% maximum ripple) at less than 65 mA (exclusive of load) Analog Receiver:15 to 30V dc (10% maximum ripple) at less than 65 mA (exclusive of load) Beam1450 nm, infrared13 mm effective beam diameter Sensing RangeLow-gain models:2 m (6.5') High-gain models:4 m (13') Super high-gain models:8 m (26') Output ConfigurationDiscrete models:Bi-polar current sinking (NPN) white wire; current sourcing (PNP) black wire Analog models:0–10V (black wire) Output RatingDiscrete models:100 mA maximum load @ 25° C OFF-state leakage current:less than 10 μA ON-state saturation voltage: • PNP:less than 1.2V at 10 mA; less than 2.5V at 100 mA • NPN:less than 200 mV at 10 mA; less than 1V at 100 mA • Protected against false pulse on power-up and continuous overload or short circuit: Analog models:2 KΩ minimum impedance Output ResponseDiscrete models: • 10x excess gain or more:1 ms ON and OFF response; 500 μs repeatability • 2x to 10x excess gain:3 ms ON and OFF response; 2.5 ms repeatability • Analog models:25 ms for a 95% step change AdjustmentsLight Operate/Dark Operate:depending on model selected Frequency:selected via gray wire • A:Gray (+) • B:Gray (–) • Emitter only:LED inhibit — selected via white wire. White (–) turns emitter LED OFF (to allow verification of receiver operation) IndicatorsGreen LED on housing top:Power ON Receiver only: • Yellow AID LED on housing top:Flashes to indicate signal strength (faster flash = better signal) • Yellow LED (large oval on housing back):Discrete output conducting • Environmental RatingIEC IP67 (NEMA 6) and 1200 psi washdown NEMA ICS 5, Annex F-2002 ConstructionPC/ABS plastic housing; acrylic window Connection5-wire 2 m or 9 m cable (6' or 30') or 150 mm (6 in.) Operating ConditionsTemperature:−20° to +60°C (−4° to +140°F) Relative Humidity:95%; non-condensing
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