Photoelectric Sensors

BOS diffuse sensors

For detecting contrast differences

Our vast array of diffuse sensors offers an economical solution if you want to reliably detect contrast differences. These diffuse sensors detect objects based on their surface, color, and material. Thus, their scanning range depends on the size, shape, color, and texture of the reflective object surface.

The emitter and receiver are housed together in a single unit so that you can easily install the diffuse sensors and align them quickly using their highly visible light beams.

You select the most suitable light type based on your application. Depending on the model, our diffuse sensors offer you highly visible red light, invisible infrared light, or very precise laser light that is ideally suited for detecting small parts.

For color-independent and surface-independent detection, we recommend diffuse sensors with background suppression. They work with red light or laser red light. Their scanning response is virtually constant, even with different reflectance levels.


  • Ideal for detecting contrast differences
  • dependent upon surface, color and material
  • Economical and easy to mount and align thanks to highly visible light beams
  • Shorter ranges as compared to retro-reflective and through-beam sensors
  • Only one unit to install

BOS diffuse sensor with background suppression

Virtually regardless of color and surface type

Our diffuse sensors with background suppression detect objects within a set switching distance, without being affected by reflective backgrounds, just about regardless of the color and surface of the object. Object and background can be differentiated very definitively, especially as these diffuse sensors are characterized by their low gray value shift and hysteresis.

Since the transmitter and receiver are housed together in a single unit to save space, you can easily mount our diffuse sensors and align them quickly. In addition, the highly visible light beam with the versions available in red light and lasers make it easier for you to do this. You can easily adjust the settings using teach-in or via a potentiometer.


  • Reliable object detection with various operating ranges, independent of surface, color, and material
  • Detects objects against very close backgrounds, even if they are very dark against a bright background
  • Almost constant pulse width even with different reflectance
  • Only one electrical device without reflectors or separate receivers
  • With red light or the laser red light that is ideally suited for detecting small parts

BOS retroreflective sensors

Reliable object detection regardless of surface, color, and material

Whatever your application, Balluff offers you a wide range of retroreflective sensors. These enable you to reliably detect objects regardless of surface, color, and material. If you use a polarizing filter, our retroreflective sensors even enable you to detect shiny objects.

The transmitter and receiver are housed together in a single unit so that you can easily mount it and align it quickly with its generous mounting tolerances.

You select the most suitable light type based on your requirements. Depending on the model, our retroreflective sensors work with highly visible red light, invisible infrared light, or very precise laser light that is ideally suited for detecting small parts.


  • Simple alignment thanks to generous mounting tolerances
  • Large reflectors for high ranges
  • Reliable detection – regardless of surface, color, and material
  • Also with a polarizing filter suitable for detecting shiny objects
  • Installation of only one electrical device plus reflector

BOS through-beam sensors

Positioning made easy

Through-beam sensors from Balluff serve to detect objects reliably, regardless of surface, color, material - even with a heavy gloss finish. They consist of separate transmitter and receiver units that are attuned to each other. When an object interrupts the light beam, this causes a change in the output signal in the receiver with absolute reliability.


  • Ideal for positioning tasks thanks to excellent reproducibility
  • Extremely resistant to contamination and has a large functional reserve
  • Ideally suited for large operating ranges
  • Transmitter and receiver in separate housings

BGL through-beam fork sensors

Unmatched high precision and reliability

Our fork sensors with transmitter and receiver in one housing are pre-adjusted. That reduces your expense, saves valuable time during start-up and supports reliable processes. When it comes to accuracy, small parts and detail detection, and operating reliability, our fork sensors are unsurpassed. The broad product offering also ensures reliable solutions even for challenging applications such as transparency detection, water detection and web edge control.


  • Different light types (red light, infrared, laser)
  • Rugged metal housing
  • Simple alignment to the object
  • High optical resolution and repeat accuracy
  • Fork widths from 5…220 mm with standardized mounting holes
  • Identical mechanical and optical axes
  • High process reliability since the transmitter and receiver are firmly aligned with each other
  • Save time and expense – only one electrical connection is required

BWL angle sensors

Precise detection at any angle and around corners

Angle sensors are used for demanding applications – for example, in feed monitoring of objects or in counting and detection in complex feed systems. The form factor and beam geometry enable the approach and detection of objects from almost every direction.

They are quick to install – even in tight mounting spaces. because the emitter and receiver are permanently aligned with each other.


  • Ideal for every application thanks to different light types (red light, infrared, laser)
  • Rugged metal housing
  • Its angled form allows extremely flexible mounting
  • High optical resolution and repeat accuracy
  • Identical mechanical and optical axes
  • High process reliability since the transmitter and receiver are permanently aligned with each other
  • No time-intensive adjustment
  • Large selection of different shapes and sizes

Optical window sensors BOW

Dynamic or static area checking within a stable frame

Our optical window sensors are useful where objects are to be checked not only at discrete points, but also within a range. Thanks to their multitude of beams arranged in parallel, they can detect objects within a broad window. Optical window sensors are available in a variety of dynamic and static versions. The dynamic version detects only moving objects. Feed equipment etc. does not affect detection, so that fast and randomly falling objects can be counted.


  • Uniformly high resolution over the whole area of the frame
  • Detects small parts down to 0.8 mm diameter
  • Robust metal housing with M8 standard plug connector
  • Adjustable sensitivity and output signal length
  • Dynamic and static versions
  • Modular construction kit with numerous frame sizes

BLG light grids

Count objects and measure large areas

Our light grids are ideally suited for scanning larger areas, for counting parts, for detecting stack heights (of paper, for example) or for measuring the height of pallets. This makes them superior to traditional through-beam sensors that typically scan only selectively at points. Balluff's light grids feature a switching output – for counting, for example – and an analog output for measurement tasks.


  • Different lengths available
  • Also suitable for large objects up to a range of 2.1 m
  • Ideal for counting due to its short response time
  • Rugged metal housing
  • Invisible infrared light
  • Switching output (PNP) and analog output (0…10 V)
  • Simple connection, easily-assembled installation without additional equipment
  • Ready to use – no parameter setting necessary

BLA light bands

Identify parts, determine positions and count objects with high precision

Our multi-functional, high-resolution BLA light bands combines up to three different parallel measurement results in one device: you can identify parts, determine positions and count objects. Numerous measurement modes are available such as testing object diameters, positions and quantities, gap width and position, as well as edge position. Using the simple and intuitive control panel, you can program recognition of up to six different objects through digital outputs.


  • Rugged metal housing
  • 20mm or 50 mm wide light band
  • Distances up to 2 m possible
  • Excellent resolution of 0.01 mm
  • Two freely configured analog outputs
  • Three programmable digital outputs
  • Intelligent noise contour suppression
  • Self-contained device – no additional accessories such as controller, PC or software required
  • Consistent, homogeneous light array

BFS color sensors

Reliably determine color and contrast – better than the human eye

Use color sensors to simplify and accelerate your automated processes, for example, in detecting color nuances in textiles or painted sheets as well as colored markings on packaging or labels. They ensure consistently high product quality and contribute to reliable production sequences. The true-color sensors differentiate even subtle color nuances and evaluate the quality of the finished pieces objectively and unerringly.


  • High switching frequency
  • With or without display
  • Robust and industrial grade
  • High ranges to 400 mm thanks to a strong white light
  • Optional with IO-Link interface for simple parameterization
  • Differentiation between any number of objects (255 can be directly learned)
  • Very high color resolution
  • Application-specific parameterization

BKT contrast sensors

Fast detection of print markings and slight contrast differences

Contrast sensors are high-resolution diffuse sensors that distinguish objects based on their gray values. Balluff's rugged contrast sensors recognize even small differences in contrast, have a high switching frequency up to 30 kHz and are therefore particularly fast. They enable high positioning precision and are appropriate for a variety of applications, for example, in the printing and packaging industry.


  • For fast processes, with a high switching frequency up to 30 kHz
  • Different light types (laser/red/green/blue or white light)
  • Large ranges with laser
  • Highly visible light spots
  • Pulse stretching
  • Teach-in possible
  • Also available with analog output signal
  • Available with display for simple setup
  • Different models for different applications

BLT luminescence sensors

Reliably detect invisible marks and markings

Our luminescence sensors, with their UV light sensor, detect objects that an unaided human eye cannot see. They are useful for detecting invisibly marked products. Or for testing lubricants which have been previously enriched with luminescent particles.


  • UV light – no external lamp or light source required
  • Programmable with the touch of a button – without separate software
  • Robust, industrial-grade configurations

BFB fiber-based devices for plastic and glass fibers

Maximum flexibility thanks to plastic or glass-fiber optics

Fiber optic sensors are used where traditional photoelectric sensors are too large or inflexible. Our fiber optic sensors are combined with plastic or glass fiber optics for a complete sensor. This gives you the maximum flexibility for any application. Plastic fiber optics are used for lesser requirements in ruggedness, temperature and chemical resistance, but we also offer high-temperature plastic fiber optics. Glass fiber optics feature non-crush, temperature and chemical resistant properties.


  • For detecting low contrast differences
  • Very fast – up to 8 kHz
  • High positioning precision
  • Flexibly mountable, simple to install
  • Mechanically rugged
  • With one-way or detecting principle
  • Straight or angled optics
  • Compact configuration for mounting on DIN rails
  • With or without display
  • Different light types (red or infrared)
  • Also optionally available with analog output signal
  • For glass or plastic fibers

BFO plastic and glass fibers for fiber-based devices

Top-shelf performers with special qualities

Our plastic and glass fibers, which are designed and tested for our fiber-based devices, are available as switches or in single-use designs. You can use these wherever mounting space is at a premium: for example for small parts detection, checking parts features, parts positioning, counting and in robotics.

Plastic optics are used when requirements for robustness as well as temperature or chemical resistance are low. Glass fiber optics are suitable for harsh environments – even with oil mist and influence from chemicals – as well as for temperatures of over 200 °C. Both our plastic as well as glass fibers are characterized by their transmission accuracy and speed.


  • High function reserve
  • High quality materials and precise machining
  • Homogeneous optical properties
  • Compact, flexible, and robust with various sheathing materials, lengths, and diameters
  • Teach in on the sensor via teach-in input or via IO-Link
  • With diagnostics and condition monitoring functions upon request
  • Also available as user-configurable fibers
  • Various terminators with straight or right-angle light exit or bendable optical head for plastic fibers

BOH Micromote sensors

Exceptionally small sensor heads

The MicroMote system is especially small and is therefore highly flexible in its uses. It combines an external amplifier with unusually small photoelectric sensor heads. As a result it is suitable even for extremely constricted spaces and moving machine elements. A variety of housing styles ensures especially high design freedom, while precise photoelectric components ensure high process accuracy in any application.


  • Large selection of sensor heads with maximum precision: Microspot, Nanospot, lasers, infrared, classic red-light LEDs
  • Amplifier for analog, digital, dynamic
  • Display indication of target and actual values
  • Convenient operation
  • Extremely flexible sensor cable
  • Outstanding technical parameters
  • Rugged, for challenging environments
  • Ideal for use in grippers
  • Elegant, seamless integration into machines

BOD photoelectric distance sensors

Specialized in optical distance measurement

Photoelectric distance sensors from Balluff help you with positioning, material flow control, or level detection, as well as in many other applications. Whether in the automotive industry, factory automation, logistics, or in constructional steelwork, you can achieve noticeable increases in productivity through reliable distance measurement and avoid faults in a targeted manner. With that in mind, we offer various, somewhat adjustable measurement ranges from 20 mm to 20 m and variants with and without background suppression ability.

Our non-contact, wear-free sensors use either red light or laser light. They are housed in durable plastic or metal housings and have analog current and voltage outputs as well as digital serial or IO-Link interfaces.


  • Ideal for distance measurements and distance monitoring of short, medium, and long measurement ranges
  • Additional switching outputs with adjustable switchpoints available for almost all products
  • Teach in on the sensor via teach-in input or via IO-Link
  • With diagnostics and condition monitoring functions upon request
  • UL approval and optional Ecolab certifications
  • Suited for harsh environments, available in IP65/67 and IP69K