DRT 25C dynamic reference diffuse sensor

Specialized in packaging machines for confectionery and baked goods

Wide range of shapes and surfaces: sensors must safely detect a wide variety of products and films on the conveyor belts of packaging machines (HFFS, FS, Thermoform, and VFFS) for confectionery and baked goods. In addition, they must work continuously after a product changeover, without requiring further setup.
The dynamic reference diffuse sensor DRT 25C is specialized for this type of application. It works reliably with flat and spherical products, transparent to high-gloss films as well as irregular shapes and contours.
Its innovative detection mechanism with the unique reference technology and three light spots uses the conveyor as a point of reference, not the product. This is how the DRT 25C detects any type of object as a ‘deviation’ to the conveyor belt surface. The detection is independent of the surface characteristics of the products, such as the color, gloss, and transparency.

Advantages for you

  • The reliable detection of objects even with difficult shapes and surfaces ensures continuous machine output and prevents downtime.
  • No realignment of the sensor is required when switching products or packaging materials. The shorter setup times result in higher product volumes.
  • Fast and easy teaching setup of the belt surface using the teach button. Only one universal mounting position is required for all objects.
  • Reliable operation even if the conveyor belt is soiled or vibrating.
  • IO-Link for easy integration of additional functions in the machine control, such as warning message in case of excessive contamination, use of the counter built into the sensor, or locking of the teach button


Product detection on conveyor belts of primary packaging machines

To control the buffer section and the weld bar, the front edges of the products on the conveyor belt must be reliably detected. The sensor must also reliably detect products with challenging dimensions from very flat to very tall, in order to prevent machine stoppages due to incorrect detection. The sensor must be easy to set up for all products.

The DRT 25C reliably detects anything, from small and flat to tall and spherical products, even if the shapes and contours are irregular. This means that machines can be fitted with a single sensor regardless of the application. The single button teach function also makes the DRT 25C easy to set up.

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Detection of products on conveyor belts of secondary packaging machines

For trouble-free control of the buffer section, the front edges of packagings from various materials and with a wide variety of surfaces must be reliably detected. Changing products or packaging films should not require any additional setup and alignment work on the sensor.

The unique technology of the DRT 25C uses the conveyor belt surface as the point of reference. The detection is independent of the surface characteristics of the materials used, such as the color, gloss, and transparency. This means no setup work on the sensor is required when changing products.

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Highlights in detail

Three beams for maximum reliability

No matter what shape the confectionery and baked goods and their packaging have: With its three light beams, the DRT 25C reliably detects the front edges of the objects and ensures that the process goes smoothly without any machine downtime. Thanks to the wide scan, even products with openings, such as cookie curls, are safely detected as a continuous piece.
From transparent to high-gloss

Packagings with different colors and transparency are safely detected as a ‘deviation’ from the conveyor belt surface due to the reference technology. This means that even machines that process a wide range of films can be equipped with a single sensor type.
No setup time when changing products

When performing the initial setup, the conveyor belt surface is taught in as a point of reference with the teach button. After a product changeover, it is not necessary to adjust this setting, as the point of reference remains the same. In addition, the mounting position and the alignment of the sensor itself can be continuously used for the widest variety of objects. This means that no setup effort is required for the sensor when changing products.
Unique reference technology

The DRT 25C works with the conveyor belt surface as a dynamic reference for the detection of objects. With this method, the surface characteristics of the conveyor belt are taught in via the teach button. The sensor will then detect all objects that do not correspond to the conveyor belt surface. Even contamination on the conveyor belt can be considered with this technology.

Technical properties

  • Reference technology and three LED light spots for reliable object detection with the widest variety of shapes and surfaces.
  • Large working range for conveyor belt spacings of 50-200 mm
  • High switching frequency of 750 Hz for belt speeds up to 2 m/s
  • Easy configuration via an operating button (teach button)
  • IO-Link interface for standardized communication with the machine control in the dual channel principle or in SIO mode
  • Compact housing: only 15 mm x 42.7 mm x 30 mm for universal use