Ultrasonic flow velocity probe, ATEX Zone 0: RS485 MODBUS | MAINSTREAM INSTRUMENTS

The MainProbeX RS485 MODBUS is a compact, low-power ultrasonic velocity probe designed for immersed flow measurement in demanding environments. It provides bidirectional velocity measurement through a RS485 Modbus RTU interface and is suitable for installations requiring ATEX Zone 0 certification. The sensor operates with a minimum water depth of 30 mm and continuously applies temperature compensation to maintain measurement accuracy.

Presentation

MainProbeX RS485 MODBUS is an immersed ultrasonic sensor developed to measure flow velocity using signal processing based on reflected ultrasonic waves from bubbles and suspended particles carried by the flow. The instrument integrates transmission, reception, and signal processing in a single compact body. It also includes a signal quality indicator, velocity histogram monitoring, and a diagnostic velocity signal recording function to support measurement validation and maintenance.

Advantages

• Bidirectional measurement range from 10 mm/s to 5 m/s
• ATEX Zone 0 certified for hazardous environments
• RS485 Modbus RTU communication for easy system integration
• Low power consumption with supply from 6 to 28 Vdc
• Temperature-corrected velocity measurement for improved consistency
• Mainstream Adaptive Measurement System automatically adjusts acquisition time to flow conditions
• Compact, IP68 fully encapsulated design for harsh field deployment
• Integrated signal quality monitoring for diagnostic confidence

Main Features

• Measurement principle: ultrasonic phase coherence delay measurement
• 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 to 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
• Industrial and process water velocity measurement
• Wastewater and effluent flow studies
• Hazardous-area flow installations requiring intrinsically safe instrumentation
• Embedded flow monitoring systems using Modbus networks
• Sites requiring compact immersed sensors with continuous measurement diagnostics

Why choose MainProbeX RS485 MODBUS

MainProbeX RS485 MODBUS combines compact mechanical design, robust field communication, and intrinsically safe ATEX Zone 0 compliance in a single immersed ultrasonic probe. Its adaptive measurement management, temperature compensation, and signal quality monitoring make it a strong choice for users who need reliable flow velocity data in constrained or hazardous environments while keeping integration straightforward through RS485 Modbus RTU.