Pepperl+Fuchs DK21-25_110_124 Print Mark Contrast Sensor

Technical Overview

The Pepperl+Fuchs DK21-25/110/124 is a print mark contrast sensor designed for reliable detection of various print marks. It utilizes a diffuse mode sensing principle and features dynamic TEACH-IN for automatic switching threshold adaptation, ensuring optimal performance across different materials and contrasts. The sensor offers a fast response time, multiple emitter colors (green, red, blue), and a robust design with IP67 protection, making it suitable for demanding industrial environments.

Key Features

Diffuse mode sensor for recording any print mark.
Dynamic TEACH-IN: automatic switching threshold adaptation with one key pressure.
Optical system exchangeable by 90°.
30 µs response time, suitable for extremely rapid scanning processes.
3 emitter colors: green, red and blue.
Push-pull output, short-circuit protected, reverse polarity protected.
M12 plug connection.
High switching frequency of 16.5 kHz.
IP67 degree of protection.

Technical Specification Matrix

Parameter	Value
Sensor range	25 mm ± 6 mm
Light source	LED
Light type	Visible green/red/blue, modulated light
Light spot representation	2 mm x 8.5 mm
Angle deviation	max. ± 3°
Ambient light limit (Continuous light)	7000 Lux
Teach-in type	Dynamic Teach-In
Operating voltage (UB)	10 ... 30 V DC
Ripple	10 %
No-load supply current (I0)	≤ 60 mA
Function input	Teach-In input
Signal output	Push-pull output, short-circuit protected, reverse polarity protected
Switching frequency	16.5 kHz
Response time	30 µs
Degree of protection	IP67
Ambient temperature	-20 ... 60 °C
Product standard	EN 60947-5-2
Shock and impact resistance	IEC / EN 60068

Industrial Applications

1. High-Speed Packaging Line Print Mark Detection

In automated packaging lines, precise and rapid detection of print marks on film or labels is crucial for accurate cutting, folding, or sealing. This sensor's 30 µs response time and 16.5 kHz switching frequency allow it to reliably track print marks even at very high conveyor speeds.

Problem Solved

Prevents misalignment and production errors in high-speed packaging due to missed or inaccurately detected print marks.

High-speed packagingprint mark detection30 µs response time16.5 kHz switching frequencyautomated production

2. Color-Independent Label Presence Verification

For manufacturing processes involving labels or packaging with varying print mark colors, this sensor's RGB emitter (green, red, blue) ensures reliable contrast detection regardless of the mark's color against its background. The dynamic TEACH-IN feature simplifies setup for different product batches.

Problem Solved

Eliminates the need for multiple sensors or manual adjustments when switching between products with different colored print marks, streamlining changeovers.

Color detectionlabel verificationRGB emitterdynamic TEACH-INflexible manufacturing

3. Harsh Environment Material Handling and Sorting

With an IP67 rating, this sensor is well-suited for industrial environments where dust, water splashes, or wash-downs are common, such as in food processing, bottling plants, or logistics sorting facilities. Its robust protection ensures consistent performance and longevity in challenging conditions, detecting marks on packages or conveyables.

Problem Solved

Ensures reliable print mark detection and operational continuity in demanding industrial settings prone to moisture and particulate matter.

IP67harsh environmentsmaterial handlingsortingindustrial automationwash-down