Leuze Sensor DMU318-300/CT-M12 Ultrasonic distance sensor

Description

The DMU318-300/CT-M12 uses Time-of-Flight (ToF) technology but with a firmware profile tuned for edge detection. Because it uses sound waves, it is the industry standard for “difficult” targets like clear glass vials, transparent plastic films, or high-gloss metallic components that often cause “burn-through” or reflections in laser sensors.

The “CT” (Counting/Trigger) logic provides a significantly higher switching frequency than standard analog distance sensors. This allows it to reliably “see” the tiny gap between two fast-moving bottles on a conveyor or to detect a “double-fed” sheet of paper or foil in a printing or packaging machine.

Features

Short-Range Precision: Optimized for a tight 300 mm window, offering high-resolution detection for small parts and thin materials.
Specialized “CT” Logic: Engineered for high-speed counting and trigger tasks with a fast response time to catch narrow gaps.
Material Independence: Easily detects clear labels, transparent packaging, and dark or shiny objects without recalibration.
Compact M18 Housing: The PBT (plastic) body is lightweight (~70g) and resistant to industrial chemicals, making it ideal for washdown environments.
Onboard Teach Button (3): Features a manual button on the rear for quick calibration of the switching threshold without needing external software.
Integrated Temperature Compensation: Automatically adjusts for air density changes to ensure the “trigger” point remains stable even as the factory warms up.

Specifications

Feature	Specification
Sensing Range	40 mm to 300 mm
Blind Zone (Dead Band)	0 mm to 40 mm
Output Type	PNP / NPN Switching (Push-Pull)
Operating Voltage	10 – 30 V DC
Switching Frequency	Up to 25 Hz (Optimized for counting)
Response Time	< 20 ms
Housing Material	Plastic (PBT) / Epoxy resin face
Connection	M12, 4-pin male connector

Applications

Double Sheet Detection: Identifying when two layers of paper, film, or metal foil are fed into a machine simultaneously to prevent jams or damage.
High-Speed Counting: Counting small, transparent, or irregularly shaped items (like glass vials or clear plastic lids) on a conveyor.
Clear Label Detection: Sensing the gap between clear labels on a clear backing liner during high-speed application.
Splice Detection: Identifying the joint or “splice” in a continuous roll of material to trigger a machine event.
Small Part Presence: Verifying the presence of components in an assembly nest where space is limited and optical contrast is low.