Ultrasonic flow velocity probe - low power: RS485 MODBUS | MAINSTREAM INSTRUMENTS

The MainProbe RS485 MODBUS is a compact, low-power ultrasonic velocity probe designed for immersed flow measurement in water and process liquid applications. It communicates through a RS485 Modbus RTU interface and provides bidirectional velocity measurement from very low flow conditions up to 5 m/s. The probe operates with a minimum water depth of 30 mm and continuously applies temperature compensation to maintain reliable velocity measurement.

Advantages

• Compact immersed design integrating transmission, reception, and ultrasonic signal processing
• Bidirectional measurement range from 10 mm/s to 5 m/s
• RS485 Modbus RTU communication for straightforward integration into monitoring systems
• Low power consumption with 6 to 28 Vdc supply
• Continuous temperature correction to compensate for sound velocity variations
• Mainstream Adaptive Measurement System that automatically adjusts acquisition time to flow conditions
• Signal quality monitoring with histogram and diagnostic support for measurement validation
• IP68 fully encapsulated construction for demanding field environments

Main Features

• Measurement principle: ultrasonic phase coherence delay measurement
• Transducer type: immersed sensor with integrated transmission, reception, and signal processing
• Velocity range: from -5 m/s to -10 mm/s and from 10 mm/s to 5 m/s
• Resolution: 1 mm/s
• Minimum flow depth: 30 mm
• Start-up time: measurement available 1.5 seconds after power-up
• Communication: Modbus RTU via semi-duplex RS485
• Address range: 1 to 247
• Configurable baud rates: 2400, 4800, 9600, 19200, 38400, 57600, 115200
• Supply voltage: 6 to 28 Vdc
• Maximum current: 25 mA in measurement mode
• Materials: profiled PVC-U body and polyurethane cable
• Protection rating: IP68
• Operating temperature: -10 °C to 80 °C
• Dimensions: 105 x 50 x 20 mm
• Maximum cable length: 300 m
• Weight: 850 g with standard 10 m cable

Typical Applications

• Open channel flow monitoring
• Wastewater and effluent flow measurement
• Process water velocity monitoring
• Embedded liquid flow monitoring systems using Modbus communication
• Installations requiring compact immersed ultrasonic sensing
• Sites where signal quality diagnostics are important for measurement confidence

Why choose MainProbe RS485 MODBUS

MainProbe RS485 MODBUS combines compact mechanical design, stable digital communication, and advanced adaptive measurement management in one immersed ultrasonic probe. Its low power requirement, temperature-corrected velocity measurement, and integrated signal quality monitoring make it a strong solution for users who need reliable flow velocity data in water and liquid applications while keeping integration simple through RS485 Modbus RTU.