The DFRobot URM15 is an industrial-grade ultrasonic ranging sensor with an IP65-rated waterproof probe. It provides an effective measuring range of 30–500 cm (tested against a flat wall) and communicates via an RS485 interface using the standard Modbus RTU protocol, making it compatible with PLCs and other industrial controllers.

The sensor features a 75 kHz ultrasonic transducer with a 40 mm diameter, delivering a relatively narrow beam angle (20° ±2°) and high sensitivity. Built-in temperature compensation — selectable between onboard and external sources — helps reduce the impact of ambient temperature variations on measurement accuracy.

Key Features

• IP65 Waterproof Probe – Suitable for outdoor and harsh-environment installations
• RS485 / Modbus RTU – Standard industrial communication protocol
• Configurable Address & Serial Parameters – Supports multiple sensors on a single bus
• Temperature Compensation – Onboard or external, for improved accuracy across temperature ranges
• Narrow Beam Angle – 20° ±2° (−6 dB) for focused detection

Specifications

• Operating Voltage – 5–12 V DC
• Max Instantaneous Current – 350 mA
• Effective Measuring Range – 30–500 cm
• Distance Resolution – 10 mm
• Distance Error – ±1%
• Temperature Resolution – 0.1 °C
• Temperature Error – ±1 °C
• Measuring Frequency – 10 Hz
• Operating Temperature – −10 °C to +70 °C
• Operating Humidity – RH <75%
• Acoustic Frequency – 75 kHz ±2%
• Directional Angle – 20° ±2° (−6 dB)
• Communication – RS485 (Modbus RTU)

Resources

• Product Wiki

Package Contents

• 1× URM15 75 kHz Ultrasonic Sensor