Leuze KRT21M-09.PL3/42-M12 Contrast Sensor
Leuze KRT21M-09.PL3/42-M12 contrast sensor provides 9 mm operating range, RGB LED light, PNP switching for marking detection tasks applications. Manufactured by Leuze, this Leuze Contrast Sensor belongs to the KRT Series and supports 9 mm ± 3 mm operating range, RGB LED light source, PNP transistor output, 15,000 Hz switching frequency, 10–30 V DC supply, focused beam optics, and IP67 protection.
| Brand | Leuze |
| Product Type | Contrast Sensor |
| Product | KRT21M-09.PL3/42-M12 |
Leuze KRT21M-09.PL3/42-M12 Contrast Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Design | Cubic |
| Dimension (W x H x L) | 31 mm x 53 mm x 80.1 mm |
| Special version | Time function |
| Operating range | 9 mm ± 3 mm |
| Beam path | Focused |
| Light Source | LED, RGB |
| Light spot size [at sensor distance] | 1.5 mm x 5 mm |
| Light spot orientation | Vertical |
| Type of light spot geometry | Rectangular |
| Light beam exit | On face |
| Wavelength | - |
| Supply voltage UB | 10 ... 30 V, DC |
| Number of teach inputs | - |
| Number of digital switching outputs | 2 Piece(s) |
| Switching output | Transistor, PNP |
| Switching principle | Switching signal on mark |
| Switching frequency | 15,000 Hz |
| Response time | 300 ms |
| Con:1 Function | Signal OUT Voltage supply |
| Type of connection | Connector |
| Thread size | M12 |
| Type | Male |
| Material | Metal |
| No. of pins | 4-pin |
| Housing material | Metal |
| Housing color | Black |
| Type of fastening | Front mounting with thread Through-hole mounting |
| Type of display | LED |
| Operational controls | Teach button |
| Ambient temperature, operation | -10 ... 55 °C |
| Ambient temperature, storage | -20 ... 70 °C |
| Degree of protection | IP 67 |
The KRT21M-09.PL3/42-M12 Leuze 9 mm Operating Range Contrast Sensor is designed for accurate contrast recognition in industrial automation systems. The KRT21M-09.PL3/42-M12 operates using a 9 mm operating range, RGB LED light source, focused beam path, and PNP switching output. It is part of the KRT Series and is commonly integrated where precise mark detection is required.
This contrast sensor is used on conveyors, packaging machines, labeling systems, and automated assembly lines. Its switching signal on mark principle ensures stable detection of print marks and color contrasts. Front beam exit and through-hole mounting allow reliable installation, while teach button operation simplifies setup during commissioning and product changeovers.
The KRT21M-09.PL3/42-M12 reflects Leuze’s focus on dependable sensing technology for industrial environments. A metal housing, M12 connector interface, and IP67 protection support long-term operation under standard factory conditions. As a Leuze KRT Series device, it is suited for consistent contrast detection where accuracy and durability are required.
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