4-20HR-MaxSonar-WRMI(MB7489)

The MB7489 4-20HR-MaxSonar-WRMI is a rugged, weather-resistant ultrasonic distance sensor designed for outdoor applications. It provides millimetre-resolution distance readings from 500mm to 5000mm using a 4–20mA analogue current output (20mA at minimum range, 4mA at maximum range), making it directly compatible with industrial PLCs and data acquisition systems.

The sensor is housed in a compact, robust PVC enclosure rated to IP67, compatible with standard 3/4-inch PVC pipe fittings. It uses advanced signal processing — including continuously variable gain, real-time background calibration, waveform signature analysis, and noise rejection algorithms — to provide reliable readings even in noisy environments.

Key Features

• Weather Resistant – IP67-rated PVC housing for outdoor use
• 4–20mA Output – Industry-standard analogue current interface
• Millimetre Resolution – ~1.6mm measurement resolution
• Long Range – 500mm to 5000mm detection range
• Intelligent Target Selection – Reports distance to the largest acoustic return, ignoring smaller targets and clutter
• Factory Calibrated – Narrow beam pattern for reliable long-range detection

Specifications

• Model – MB7489
• Operating Voltage – 10–32V
• Operating Current – 40mA
• Detection Range – 500–5000mm (objects closer than 500mm typically read as 500mm)
• Resolution – ~1.6mm
• Read Rate – 7.5Hz
• Ultrasonic Frequency – 42kHz
• Output – 4–20mA analogue current
• Operating Temperature – −40°C to +65°C
• Ingress Protection – IP67

Ideal For

• Outdoor tank and bin level monitoring
• Industrial distance measurement
• Environmental monitoring stations
• Automated fill-level detection

Package Contents

• 1× MB7489 4-20HR-MaxSonar-WRMI ultrasonic sensor

Resources

• 4-20HR-MaxSonar-WR Datasheet (PDF)