DFRobot
URM15 - 75KHZ Ultrasonic Sensor (30~500cm, RS485)
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...
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
Package Contents
- 1× URM15 75 kHz Ultrasonic Sensor
Jargon buster
Plain-language definitions for the technical terms used above.
- Modbus
- Modbus is an industrial communication protocol used by many meters, sensors, PLCs, and automation devices. Modbus support matters because it can make the controller easier to integrate with existing industrial equipment.
- Modbus RTU
- Modbus RTU is a version of Modbus commonly used over RS485 serial wiring. It matters if you need to connect the controller to industrial sensors, meters, or drives that use serial Modbus rather than Ethernet.
- RS485
- RS485 is a robust wired serial communication standard often used in factories, farms, and buildings where cables may be long or electrically noisy. It matters because it lets this controller connect to industrial sensors, meters, and control equipment over longer distances than typical hobby serial wiring.
- Temperature compensation
- Temperature compensation means the sensor adjusts its readings to reduce errors caused by changes in water temperature. This matters for field monitoring because ponds, rivers, and tanks can vary in temperature throughout the day and across seasons.
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Brands
Supplier page — dfrobot.com
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Related Tutorials
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