WORLD-BEAM QS18 Standard Series


  • 10 to 30V dc supply voltage with NPN or PNP output, depending on model
  • Available in opposed, polarized and non-polarized retroreflective, convergent, regular and wide-angle diffuse, and glass or plastic fiber optic sensing modes
  • High-power infrared or visible red sensing beam
  • Bright LED operating status indicators visible from 360°

Product Specifications

Supply Voltage and Current10 to 30V dc (10% max. ripple) @ less than 25 mA (exclusive of load)
RangeOpposed (long range):20 m
Opposed (short range):3 m
Non-polarized Retroreflective:6.5 m, range is specified using one model BRT-84 retroreflector
Polarized Retroreflective:3.5 m, range is specified using one model BRT-84 retroreflector
Convergent:16 or 43 mm, depending on model
Diffuse:450 mm
Divergent Diffuse:100 mm
Plastic and Glass Fiber Optic:Range varies by sensing mode and fiber optics used
Supply Protection CircuitryProtected against reverse polarity and transient voltages
Output ConfigurationSolid-state complementary (SPDT):NPN (current sinking) or PNP (current sourcing), depending on model
Output Rating100 mA max. each output @ 25° C OFF-state leakage current:less than 50 µA @ 30V dc
ON-state saturation voltage:less than 1V @ 10 mA; less than 1.5V @ 100 mA
Output Protection CircuitryProtected against false pulse on power-up and continuous overload or short circuit of outputs
Output Response TimeOpposed:750 microseconds ON; 375 microseconds OFF
All others:600 microseconds ON/OFF
Delay at Power-up100 milliseconds; outputs do not conduct during this time.
RepeatabilityOpposed:100 microseconds
All others:150 microseconds
AdjustmentsSingle-trurn sensitivity (Gain) adjustment potentiometer
Indicators2 LED indicators:
Green ON steady:power ON
Green flashing:output overload
Yellow† ON steady:light sensed
Yellow† flashing:marginal excess gain (1.0-1.5x excess gain) in light condition
†Note:Prior to date code 0223, the output indicator was red instead of yellow.
ConstructionABS housing with acrylic lens cover. 3 mm mounting hardware is included with each sensor.
Environmental RatingIEC IP67; NEMA 6
Connections2 m or 9 m 4-wire attached PVC cable, or 150 mm pigtail with 4-pin Pico-style QD (Q), or 150 mm pigtail with 4-pin Euro-style QD (Q5), or 4-pin integral Pico-style QD (Q7), or 4-pin integral Euro-style QD (Q8), depending on model. QD cable are ordered separately.
Operating ConditionsTemperature:-20° to +70° C
Relative humidity:90% @ 50° C (non-condensing)


Product Instruction Manual

Document Name Part Number File Size Download
1. QS18 Series Sensor -- Instruction Manual 197052 Download
2. QS18 Standard Series -- Quick Start Guide 63687 Download

Data Sheets

Document Name Part Number File Size Download
1. QS18 Series Sensor -- Quick Start Guide 197051 Download
2. QS18 Universal Voltage Sensors -- Datasheet 136003 Download
3. SMB4050YL Accessory Bracket 140733 Download

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