Leuze Sensor DMU318-400.3/4CK-M12 Ultrasonic distance sensor

Description

The DMU318-400.3/4CK-M12 utilizes Time-of-Flight (ToF) technology, emitting a high-frequency acoustic pulse and measuring the precise micro-interval required for the echo to bounce off a target and return. Because it relies on sound rather than light, it is a superior choice for detecting “difficult” targets such as clear glass, liquid levels, dark plastics, or metallic foils that often “blind” laser sensors.

The “4CK” configuration is designed for versatile automation; it provides a stable 4–20 mA current loop—ideal for industrial environments where voltage signals might be susceptible to electromagnetic interference. Simultaneously, it offers a PNP digital output for threshold alerts. Both outputs can be calibrated using the integrated teach-in button on the rear of the housing, allowing for high-precision “windows” tailored to the specific application.

Features

Short-Range Precision: Optimized for a tight 40–400 mm window, providing high-resolution detection ( $< 1 mm$ ) for small parts or precise level control.
Analog & Digital Hybrid: Features a 4–20 mA analog current output for real-time distance tracking and a PNP switching output for limit alerts.
Onboard Teach Button (3): Enables rapid manual calibration of the sensing window and switching points directly on the sensor body without needing external software.
High Switching Frequency: At approximately 10 Hz, this sensor is significantly faster than long-range models, making it suitable for high-speed counting or presence detection.
Robust Plastic Housing: Constructed from chemical-resistant PBT (Polybutylene terephthalate), offering weight savings and resistance to industrial cleaning agents.
Integrated Temperature Compensation: An internal sensor automatically adjusts the distance calculation to account for changes in the speed of sound caused by air temperature fluctuations.

Specifications

Feature	Specification
Sensing Range	40 mm to 400 mm
Blind Zone (Dead Band)	0 mm to 40 mm
Output 1 (Analog)	4 – 20 mA Current
Output 2 (Switching)	PNP Transistor
Operating Voltage	10 – 30 V DC
Resolution	Approx. 0.1 mm
Accuracy	$pm 1%$ of measured value
Housing Material	Plastic (PBT) / Epoxy resin face
Connection	M12, 5-pin male connector

Applications

Vial & Small Bottle Detection: Reliably detecting clear glass or plastic containers on high-speed filling and packaging lines.
Small Hopper Level: Monitoring the fill level of small parts, seeds, or granules in vibration feeders.
Electronic Assembly: Providing distance feedback or presence detection for PCB boards or small trays in pick-and-place machines.
Film Slack Monitoring: Measuring the loop depth of narrow plastic films, foils, or wires in converting machinery.
Object Counting: Detecting small, fast-moving items on a conveyor belt where the target color may change frequently.